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2183 lines
54 KiB
2183 lines
54 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Processor capabilities determination functions. |
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* |
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* Copyright (C) xxxx the Anonymous |
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* Copyright (C) 1994 - 2006 Ralf Baechle |
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* Copyright (C) 2003, 2004 Maciej W. Rozycki |
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* Copyright (C) 2001, 2004, 2011, 2012 MIPS Technologies, Inc. |
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*/ |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/ptrace.h> |
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#include <linux/smp.h> |
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#include <linux/stddef.h> |
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#include <linux/export.h> |
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|
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#include <asm/bugs.h> |
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#include <asm/cpu.h> |
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#include <asm/cpu-features.h> |
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#include <asm/cpu-type.h> |
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#include <asm/fpu.h> |
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#include <asm/mipsregs.h> |
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#include <asm/mipsmtregs.h> |
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#include <asm/msa.h> |
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#include <asm/watch.h> |
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#include <asm/elf.h> |
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#include <asm/pgtable-bits.h> |
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#include <asm/spram.h> |
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#include <asm/traps.h> |
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#include <linux/uaccess.h> |
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|
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#include "fpu-probe.h" |
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|
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#include <asm/mach-loongson64/cpucfg-emul.h> |
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|
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/* Hardware capabilities */ |
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unsigned int elf_hwcap __read_mostly; |
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EXPORT_SYMBOL_GPL(elf_hwcap); |
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|
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static inline unsigned long cpu_get_msa_id(void) |
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{ |
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unsigned long status, msa_id; |
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|
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status = read_c0_status(); |
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__enable_fpu(FPU_64BIT); |
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enable_msa(); |
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msa_id = read_msa_ir(); |
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disable_msa(); |
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write_c0_status(status); |
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return msa_id; |
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} |
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|
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static int mips_dsp_disabled; |
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|
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static int __init dsp_disable(char *s) |
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{ |
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cpu_data[0].ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P); |
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mips_dsp_disabled = 1; |
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|
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return 1; |
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} |
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|
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__setup("nodsp", dsp_disable); |
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|
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static int mips_htw_disabled; |
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|
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static int __init htw_disable(char *s) |
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{ |
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mips_htw_disabled = 1; |
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cpu_data[0].options &= ~MIPS_CPU_HTW; |
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write_c0_pwctl(read_c0_pwctl() & |
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~(1 << MIPS_PWCTL_PWEN_SHIFT)); |
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|
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return 1; |
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} |
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|
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__setup("nohtw", htw_disable); |
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|
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static int mips_ftlb_disabled; |
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static int mips_has_ftlb_configured; |
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|
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enum ftlb_flags { |
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FTLB_EN = 1 << 0, |
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FTLB_SET_PROB = 1 << 1, |
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}; |
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|
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static int set_ftlb_enable(struct cpuinfo_mips *c, enum ftlb_flags flags); |
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|
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static int __init ftlb_disable(char *s) |
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{ |
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unsigned int config4, mmuextdef; |
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|
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/* |
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* If the core hasn't done any FTLB configuration, there is nothing |
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* for us to do here. |
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*/ |
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if (!mips_has_ftlb_configured) |
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return 1; |
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|
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/* Disable it in the boot cpu */ |
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if (set_ftlb_enable(&cpu_data[0], 0)) { |
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pr_warn("Can't turn FTLB off\n"); |
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return 1; |
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} |
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|
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config4 = read_c0_config4(); |
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|
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/* Check that FTLB has been disabled */ |
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mmuextdef = config4 & MIPS_CONF4_MMUEXTDEF; |
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/* MMUSIZEEXT == VTLB ON, FTLB OFF */ |
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if (mmuextdef == MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT) { |
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/* This should never happen */ |
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pr_warn("FTLB could not be disabled!\n"); |
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return 1; |
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} |
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|
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mips_ftlb_disabled = 1; |
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mips_has_ftlb_configured = 0; |
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|
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/* |
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* noftlb is mainly used for debug purposes so print |
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* an informative message instead of using pr_debug() |
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*/ |
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pr_info("FTLB has been disabled\n"); |
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|
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/* |
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* Some of these bits are duplicated in the decode_config4. |
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* MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT is the only possible case |
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* once FTLB has been disabled so undo what decode_config4 did. |
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*/ |
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cpu_data[0].tlbsize -= cpu_data[0].tlbsizeftlbways * |
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cpu_data[0].tlbsizeftlbsets; |
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cpu_data[0].tlbsizeftlbsets = 0; |
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cpu_data[0].tlbsizeftlbways = 0; |
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|
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return 1; |
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} |
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|
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__setup("noftlb", ftlb_disable); |
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|
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/* |
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* Check if the CPU has per tc perf counters |
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*/ |
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static inline void cpu_set_mt_per_tc_perf(struct cpuinfo_mips *c) |
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{ |
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if (read_c0_config7() & MTI_CONF7_PTC) |
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c->options |= MIPS_CPU_MT_PER_TC_PERF_COUNTERS; |
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} |
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|
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static inline void check_errata(void) |
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{ |
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struct cpuinfo_mips *c = ¤t_cpu_data; |
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|
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switch (current_cpu_type()) { |
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case CPU_34K: |
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/* |
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* Erratum "RPS May Cause Incorrect Instruction Execution" |
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* This code only handles VPE0, any SMP/RTOS code |
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* making use of VPE1 will be responsable for that VPE. |
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*/ |
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if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_34K_V1_0_2) |
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write_c0_config7(read_c0_config7() | MIPS_CONF7_RPS); |
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break; |
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default: |
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break; |
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} |
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} |
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|
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void __init check_bugs32(void) |
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{ |
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check_errata(); |
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} |
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|
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/* |
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* Probe whether cpu has config register by trying to play with |
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* alternate cache bit and see whether it matters. |
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* It's used by cpu_probe to distinguish between R3000A and R3081. |
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*/ |
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static inline int cpu_has_confreg(void) |
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{ |
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#ifdef CONFIG_CPU_R3000 |
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extern unsigned long r3k_cache_size(unsigned long); |
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unsigned long size1, size2; |
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unsigned long cfg = read_c0_conf(); |
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|
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size1 = r3k_cache_size(ST0_ISC); |
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write_c0_conf(cfg ^ R30XX_CONF_AC); |
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size2 = r3k_cache_size(ST0_ISC); |
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write_c0_conf(cfg); |
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return size1 != size2; |
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#else |
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return 0; |
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#endif |
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} |
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|
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static inline void set_elf_platform(int cpu, const char *plat) |
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{ |
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if (cpu == 0) |
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__elf_platform = plat; |
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} |
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|
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static inline void set_elf_base_platform(const char *plat) |
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{ |
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if (__elf_base_platform == NULL) { |
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__elf_base_platform = plat; |
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} |
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} |
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|
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static inline void cpu_probe_vmbits(struct cpuinfo_mips *c) |
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{ |
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#ifdef __NEED_VMBITS_PROBE |
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write_c0_entryhi(0x3fffffffffffe000ULL); |
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back_to_back_c0_hazard(); |
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c->vmbits = fls64(read_c0_entryhi() & 0x3fffffffffffe000ULL); |
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#endif |
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} |
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|
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static void set_isa(struct cpuinfo_mips *c, unsigned int isa) |
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{ |
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switch (isa) { |
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case MIPS_CPU_ISA_M64R5: |
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c->isa_level |= MIPS_CPU_ISA_M32R5 | MIPS_CPU_ISA_M64R5; |
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set_elf_base_platform("mips64r5"); |
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fallthrough; |
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case MIPS_CPU_ISA_M64R2: |
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c->isa_level |= MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2; |
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set_elf_base_platform("mips64r2"); |
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fallthrough; |
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case MIPS_CPU_ISA_M64R1: |
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c->isa_level |= MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1; |
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set_elf_base_platform("mips64"); |
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fallthrough; |
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case MIPS_CPU_ISA_V: |
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c->isa_level |= MIPS_CPU_ISA_V; |
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set_elf_base_platform("mips5"); |
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fallthrough; |
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case MIPS_CPU_ISA_IV: |
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c->isa_level |= MIPS_CPU_ISA_IV; |
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set_elf_base_platform("mips4"); |
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fallthrough; |
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case MIPS_CPU_ISA_III: |
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c->isa_level |= MIPS_CPU_ISA_II | MIPS_CPU_ISA_III; |
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set_elf_base_platform("mips3"); |
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break; |
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|
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/* R6 incompatible with everything else */ |
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case MIPS_CPU_ISA_M64R6: |
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c->isa_level |= MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6; |
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set_elf_base_platform("mips64r6"); |
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fallthrough; |
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case MIPS_CPU_ISA_M32R6: |
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c->isa_level |= MIPS_CPU_ISA_M32R6; |
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set_elf_base_platform("mips32r6"); |
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/* Break here so we don't add incompatible ISAs */ |
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break; |
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case MIPS_CPU_ISA_M32R5: |
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c->isa_level |= MIPS_CPU_ISA_M32R5; |
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set_elf_base_platform("mips32r5"); |
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fallthrough; |
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case MIPS_CPU_ISA_M32R2: |
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c->isa_level |= MIPS_CPU_ISA_M32R2; |
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set_elf_base_platform("mips32r2"); |
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fallthrough; |
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case MIPS_CPU_ISA_M32R1: |
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c->isa_level |= MIPS_CPU_ISA_M32R1; |
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set_elf_base_platform("mips32"); |
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fallthrough; |
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case MIPS_CPU_ISA_II: |
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c->isa_level |= MIPS_CPU_ISA_II; |
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set_elf_base_platform("mips2"); |
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break; |
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} |
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} |
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|
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static char unknown_isa[] = KERN_ERR \ |
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"Unsupported ISA type, c0.config0: %d."; |
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|
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static unsigned int calculate_ftlb_probability(struct cpuinfo_mips *c) |
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{ |
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|
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unsigned int probability = c->tlbsize / c->tlbsizevtlb; |
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|
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/* |
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* 0 = All TLBWR instructions go to FTLB |
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* 1 = 15:1: For every 16 TBLWR instructions, 15 go to the |
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* FTLB and 1 goes to the VTLB. |
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* 2 = 7:1: As above with 7:1 ratio. |
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* 3 = 3:1: As above with 3:1 ratio. |
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* |
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* Use the linear midpoint as the probability threshold. |
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*/ |
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if (probability >= 12) |
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return 1; |
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else if (probability >= 6) |
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return 2; |
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else |
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/* |
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* So FTLB is less than 4 times bigger than VTLB. |
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* A 3:1 ratio can still be useful though. |
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*/ |
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return 3; |
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} |
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|
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static int set_ftlb_enable(struct cpuinfo_mips *c, enum ftlb_flags flags) |
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{ |
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unsigned int config; |
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|
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/* It's implementation dependent how the FTLB can be enabled */ |
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switch (c->cputype) { |
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case CPU_PROAPTIV: |
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case CPU_P5600: |
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case CPU_P6600: |
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/* proAptiv & related cores use Config6 to enable the FTLB */ |
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config = read_c0_config6(); |
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|
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if (flags & FTLB_EN) |
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config |= MTI_CONF6_FTLBEN; |
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else |
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config &= ~MTI_CONF6_FTLBEN; |
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|
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if (flags & FTLB_SET_PROB) { |
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config &= ~(3 << MTI_CONF6_FTLBP_SHIFT); |
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config |= calculate_ftlb_probability(c) |
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<< MTI_CONF6_FTLBP_SHIFT; |
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} |
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|
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write_c0_config6(config); |
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back_to_back_c0_hazard(); |
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break; |
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case CPU_I6400: |
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case CPU_I6500: |
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/* There's no way to disable the FTLB */ |
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if (!(flags & FTLB_EN)) |
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return 1; |
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return 0; |
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case CPU_LOONGSON64: |
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/* Flush ITLB, DTLB, VTLB and FTLB */ |
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write_c0_diag(LOONGSON_DIAG_ITLB | LOONGSON_DIAG_DTLB | |
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LOONGSON_DIAG_VTLB | LOONGSON_DIAG_FTLB); |
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/* Loongson-3 cores use Config6 to enable the FTLB */ |
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config = read_c0_config6(); |
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if (flags & FTLB_EN) |
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/* Enable FTLB */ |
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write_c0_config6(config & ~LOONGSON_CONF6_FTLBDIS); |
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else |
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/* Disable FTLB */ |
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write_c0_config6(config | LOONGSON_CONF6_FTLBDIS); |
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break; |
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default: |
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return 1; |
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} |
|
|
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return 0; |
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} |
|
|
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static int mm_config(struct cpuinfo_mips *c) |
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{ |
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unsigned int config0, update, mm; |
|
|
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config0 = read_c0_config(); |
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mm = config0 & MIPS_CONF_MM; |
|
|
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/* |
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* It's implementation dependent what type of write-merge is supported |
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* and whether it can be enabled/disabled. If it is settable lets make |
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* the merging allowed by default. Some platforms might have |
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* write-through caching unsupported. In this case just ignore the |
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* CP0.Config.MM bit field value. |
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*/ |
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switch (c->cputype) { |
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case CPU_24K: |
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case CPU_34K: |
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case CPU_74K: |
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case CPU_P5600: |
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case CPU_P6600: |
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c->options |= MIPS_CPU_MM_FULL; |
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update = MIPS_CONF_MM_FULL; |
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break; |
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case CPU_1004K: |
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case CPU_1074K: |
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case CPU_INTERAPTIV: |
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case CPU_PROAPTIV: |
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mm = 0; |
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fallthrough; |
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default: |
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update = 0; |
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break; |
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} |
|
|
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if (update) { |
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config0 = (config0 & ~MIPS_CONF_MM) | update; |
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write_c0_config(config0); |
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} else if (mm == MIPS_CONF_MM_SYSAD) { |
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c->options |= MIPS_CPU_MM_SYSAD; |
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} else if (mm == MIPS_CONF_MM_FULL) { |
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c->options |= MIPS_CPU_MM_FULL; |
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} |
|
|
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return 0; |
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} |
|
|
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static inline unsigned int decode_config0(struct cpuinfo_mips *c) |
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{ |
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unsigned int config0; |
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int isa, mt; |
|
|
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config0 = read_c0_config(); |
|
|
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/* |
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* Look for Standard TLB or Dual VTLB and FTLB |
|
*/ |
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mt = config0 & MIPS_CONF_MT; |
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if (mt == MIPS_CONF_MT_TLB) |
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c->options |= MIPS_CPU_TLB; |
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else if (mt == MIPS_CONF_MT_FTLB) |
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c->options |= MIPS_CPU_TLB | MIPS_CPU_FTLB; |
|
|
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isa = (config0 & MIPS_CONF_AT) >> 13; |
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switch (isa) { |
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case 0: |
|
switch ((config0 & MIPS_CONF_AR) >> 10) { |
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case 0: |
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set_isa(c, MIPS_CPU_ISA_M32R1); |
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break; |
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case 1: |
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set_isa(c, MIPS_CPU_ISA_M32R2); |
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break; |
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case 2: |
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set_isa(c, MIPS_CPU_ISA_M32R6); |
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break; |
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default: |
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goto unknown; |
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} |
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break; |
|
case 2: |
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switch ((config0 & MIPS_CONF_AR) >> 10) { |
|
case 0: |
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set_isa(c, MIPS_CPU_ISA_M64R1); |
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break; |
|
case 1: |
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set_isa(c, MIPS_CPU_ISA_M64R2); |
|
break; |
|
case 2: |
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set_isa(c, MIPS_CPU_ISA_M64R6); |
|
break; |
|
default: |
|
goto unknown; |
|
} |
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break; |
|
default: |
|
goto unknown; |
|
} |
|
|
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return config0 & MIPS_CONF_M; |
|
|
|
unknown: |
|
panic(unknown_isa, config0); |
|
} |
|
|
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static inline unsigned int decode_config1(struct cpuinfo_mips *c) |
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{ |
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unsigned int config1; |
|
|
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config1 = read_c0_config1(); |
|
|
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if (config1 & MIPS_CONF1_MD) |
|
c->ases |= MIPS_ASE_MDMX; |
|
if (config1 & MIPS_CONF1_PC) |
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c->options |= MIPS_CPU_PERF; |
|
if (config1 & MIPS_CONF1_WR) |
|
c->options |= MIPS_CPU_WATCH; |
|
if (config1 & MIPS_CONF1_CA) |
|
c->ases |= MIPS_ASE_MIPS16; |
|
if (config1 & MIPS_CONF1_EP) |
|
c->options |= MIPS_CPU_EJTAG; |
|
if (config1 & MIPS_CONF1_FP) { |
|
c->options |= MIPS_CPU_FPU; |
|
c->options |= MIPS_CPU_32FPR; |
|
} |
|
if (cpu_has_tlb) { |
|
c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1; |
|
c->tlbsizevtlb = c->tlbsize; |
|
c->tlbsizeftlbsets = 0; |
|
} |
|
|
|
return config1 & MIPS_CONF_M; |
|
} |
|
|
|
static inline unsigned int decode_config2(struct cpuinfo_mips *c) |
|
{ |
|
unsigned int config2; |
|
|
|
config2 = read_c0_config2(); |
|
|
|
if (config2 & MIPS_CONF2_SL) |
|
c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT; |
|
|
|
return config2 & MIPS_CONF_M; |
|
} |
|
|
|
static inline unsigned int decode_config3(struct cpuinfo_mips *c) |
|
{ |
|
unsigned int config3; |
|
|
|
config3 = read_c0_config3(); |
|
|
|
if (config3 & MIPS_CONF3_SM) { |
|
c->ases |= MIPS_ASE_SMARTMIPS; |
|
c->options |= MIPS_CPU_RIXI | MIPS_CPU_CTXTC; |
|
} |
|
if (config3 & MIPS_CONF3_RXI) |
|
c->options |= MIPS_CPU_RIXI; |
|
if (config3 & MIPS_CONF3_CTXTC) |
|
c->options |= MIPS_CPU_CTXTC; |
|
if (config3 & MIPS_CONF3_DSP) |
|
c->ases |= MIPS_ASE_DSP; |
|
if (config3 & MIPS_CONF3_DSP2P) { |
|
c->ases |= MIPS_ASE_DSP2P; |
|
if (cpu_has_mips_r6) |
|
c->ases |= MIPS_ASE_DSP3; |
|
} |
|
if (config3 & MIPS_CONF3_VINT) |
|
c->options |= MIPS_CPU_VINT; |
|
if (config3 & MIPS_CONF3_VEIC) |
|
c->options |= MIPS_CPU_VEIC; |
|
if (config3 & MIPS_CONF3_LPA) |
|
c->options |= MIPS_CPU_LPA; |
|
if (config3 & MIPS_CONF3_MT) |
|
c->ases |= MIPS_ASE_MIPSMT; |
|
if (config3 & MIPS_CONF3_ULRI) |
|
c->options |= MIPS_CPU_ULRI; |
|
if (config3 & MIPS_CONF3_ISA) |
|
c->options |= MIPS_CPU_MICROMIPS; |
|
if (config3 & MIPS_CONF3_VZ) |
|
c->ases |= MIPS_ASE_VZ; |
|
if (config3 & MIPS_CONF3_SC) |
|
c->options |= MIPS_CPU_SEGMENTS; |
|
if (config3 & MIPS_CONF3_BI) |
|
c->options |= MIPS_CPU_BADINSTR; |
|
if (config3 & MIPS_CONF3_BP) |
|
c->options |= MIPS_CPU_BADINSTRP; |
|
if (config3 & MIPS_CONF3_MSA) |
|
c->ases |= MIPS_ASE_MSA; |
|
if (config3 & MIPS_CONF3_PW) { |
|
c->htw_seq = 0; |
|
c->options |= MIPS_CPU_HTW; |
|
} |
|
if (config3 & MIPS_CONF3_CDMM) |
|
c->options |= MIPS_CPU_CDMM; |
|
if (config3 & MIPS_CONF3_SP) |
|
c->options |= MIPS_CPU_SP; |
|
|
|
return config3 & MIPS_CONF_M; |
|
} |
|
|
|
static inline unsigned int decode_config4(struct cpuinfo_mips *c) |
|
{ |
|
unsigned int config4; |
|
unsigned int newcf4; |
|
unsigned int mmuextdef; |
|
unsigned int ftlb_page = MIPS_CONF4_FTLBPAGESIZE; |
|
unsigned long asid_mask; |
|
|
|
config4 = read_c0_config4(); |
|
|
|
if (cpu_has_tlb) { |
|
if (((config4 & MIPS_CONF4_IE) >> 29) == 2) |
|
c->options |= MIPS_CPU_TLBINV; |
|
|
|
/* |
|
* R6 has dropped the MMUExtDef field from config4. |
|
* On R6 the fields always describe the FTLB, and only if it is |
|
* present according to Config.MT. |
|
*/ |
|
if (!cpu_has_mips_r6) |
|
mmuextdef = config4 & MIPS_CONF4_MMUEXTDEF; |
|
else if (cpu_has_ftlb) |
|
mmuextdef = MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT; |
|
else |
|
mmuextdef = 0; |
|
|
|
switch (mmuextdef) { |
|
case MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT: |
|
c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40; |
|
c->tlbsizevtlb = c->tlbsize; |
|
break; |
|
case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT: |
|
c->tlbsizevtlb += |
|
((config4 & MIPS_CONF4_VTLBSIZEEXT) >> |
|
MIPS_CONF4_VTLBSIZEEXT_SHIFT) * 0x40; |
|
c->tlbsize = c->tlbsizevtlb; |
|
ftlb_page = MIPS_CONF4_VFTLBPAGESIZE; |
|
fallthrough; |
|
case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT: |
|
if (mips_ftlb_disabled) |
|
break; |
|
newcf4 = (config4 & ~ftlb_page) | |
|
(page_size_ftlb(mmuextdef) << |
|
MIPS_CONF4_FTLBPAGESIZE_SHIFT); |
|
write_c0_config4(newcf4); |
|
back_to_back_c0_hazard(); |
|
config4 = read_c0_config4(); |
|
if (config4 != newcf4) { |
|
pr_err("PAGE_SIZE 0x%lx is not supported by FTLB (config4=0x%x)\n", |
|
PAGE_SIZE, config4); |
|
/* Switch FTLB off */ |
|
set_ftlb_enable(c, 0); |
|
mips_ftlb_disabled = 1; |
|
break; |
|
} |
|
c->tlbsizeftlbsets = 1 << |
|
((config4 & MIPS_CONF4_FTLBSETS) >> |
|
MIPS_CONF4_FTLBSETS_SHIFT); |
|
c->tlbsizeftlbways = ((config4 & MIPS_CONF4_FTLBWAYS) >> |
|
MIPS_CONF4_FTLBWAYS_SHIFT) + 2; |
|
c->tlbsize += c->tlbsizeftlbways * c->tlbsizeftlbsets; |
|
mips_has_ftlb_configured = 1; |
|
break; |
|
} |
|
} |
|
|
|
c->kscratch_mask = (config4 & MIPS_CONF4_KSCREXIST) |
|
>> MIPS_CONF4_KSCREXIST_SHIFT; |
|
|
|
asid_mask = MIPS_ENTRYHI_ASID; |
|
if (config4 & MIPS_CONF4_AE) |
|
asid_mask |= MIPS_ENTRYHI_ASIDX; |
|
set_cpu_asid_mask(c, asid_mask); |
|
|
|
/* |
|
* Warn if the computed ASID mask doesn't match the mask the kernel |
|
* is built for. This may indicate either a serious problem or an |
|
* easy optimisation opportunity, but either way should be addressed. |
|
*/ |
|
WARN_ON(asid_mask != cpu_asid_mask(c)); |
|
|
|
return config4 & MIPS_CONF_M; |
|
} |
|
|
|
static inline unsigned int decode_config5(struct cpuinfo_mips *c) |
|
{ |
|
unsigned int config5, max_mmid_width; |
|
unsigned long asid_mask; |
|
|
|
config5 = read_c0_config5(); |
|
config5 &= ~(MIPS_CONF5_UFR | MIPS_CONF5_UFE); |
|
|
|
if (cpu_has_mips_r6) { |
|
if (!__builtin_constant_p(cpu_has_mmid) || cpu_has_mmid) |
|
config5 |= MIPS_CONF5_MI; |
|
else |
|
config5 &= ~MIPS_CONF5_MI; |
|
} |
|
|
|
write_c0_config5(config5); |
|
|
|
if (config5 & MIPS_CONF5_EVA) |
|
c->options |= MIPS_CPU_EVA; |
|
if (config5 & MIPS_CONF5_MRP) |
|
c->options |= MIPS_CPU_MAAR; |
|
if (config5 & MIPS_CONF5_LLB) |
|
c->options |= MIPS_CPU_RW_LLB; |
|
if (config5 & MIPS_CONF5_MVH) |
|
c->options |= MIPS_CPU_MVH; |
|
if (cpu_has_mips_r6 && (config5 & MIPS_CONF5_VP)) |
|
c->options |= MIPS_CPU_VP; |
|
if (config5 & MIPS_CONF5_CA2) |
|
c->ases |= MIPS_ASE_MIPS16E2; |
|
|
|
if (config5 & MIPS_CONF5_CRCP) |
|
elf_hwcap |= HWCAP_MIPS_CRC32; |
|
|
|
if (cpu_has_mips_r6) { |
|
/* Ensure the write to config5 above takes effect */ |
|
back_to_back_c0_hazard(); |
|
|
|
/* Check whether we successfully enabled MMID support */ |
|
config5 = read_c0_config5(); |
|
if (config5 & MIPS_CONF5_MI) |
|
c->options |= MIPS_CPU_MMID; |
|
|
|
/* |
|
* Warn if we've hardcoded cpu_has_mmid to a value unsuitable |
|
* for the CPU we're running on, or if CPUs in an SMP system |
|
* have inconsistent MMID support. |
|
*/ |
|
WARN_ON(!!cpu_has_mmid != !!(config5 & MIPS_CONF5_MI)); |
|
|
|
if (cpu_has_mmid) { |
|
write_c0_memorymapid(~0ul); |
|
back_to_back_c0_hazard(); |
|
asid_mask = read_c0_memorymapid(); |
|
|
|
/* |
|
* We maintain a bitmap to track MMID allocation, and |
|
* need a sensible upper bound on the size of that |
|
* bitmap. The initial CPU with MMID support (I6500) |
|
* supports 16 bit MMIDs, which gives us an 8KiB |
|
* bitmap. The architecture recommends that hardware |
|
* support 32 bit MMIDs, which would give us a 512MiB |
|
* bitmap - that's too big in most cases. |
|
* |
|
* Cap MMID width at 16 bits for now & we can revisit |
|
* this if & when hardware supports anything wider. |
|
*/ |
|
max_mmid_width = 16; |
|
if (asid_mask > GENMASK(max_mmid_width - 1, 0)) { |
|
pr_info("Capping MMID width at %d bits", |
|
max_mmid_width); |
|
asid_mask = GENMASK(max_mmid_width - 1, 0); |
|
} |
|
|
|
set_cpu_asid_mask(c, asid_mask); |
|
} |
|
} |
|
|
|
return config5 & MIPS_CONF_M; |
|
} |
|
|
|
static void decode_configs(struct cpuinfo_mips *c) |
|
{ |
|
int ok; |
|
|
|
/* MIPS32 or MIPS64 compliant CPU. */ |
|
c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER | |
|
MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK; |
|
|
|
c->scache.flags = MIPS_CACHE_NOT_PRESENT; |
|
|
|
/* Enable FTLB if present and not disabled */ |
|
set_ftlb_enable(c, mips_ftlb_disabled ? 0 : FTLB_EN); |
|
|
|
ok = decode_config0(c); /* Read Config registers. */ |
|
BUG_ON(!ok); /* Arch spec violation! */ |
|
if (ok) |
|
ok = decode_config1(c); |
|
if (ok) |
|
ok = decode_config2(c); |
|
if (ok) |
|
ok = decode_config3(c); |
|
if (ok) |
|
ok = decode_config4(c); |
|
if (ok) |
|
ok = decode_config5(c); |
|
|
|
/* Probe the EBase.WG bit */ |
|
if (cpu_has_mips_r2_r6) { |
|
u64 ebase; |
|
unsigned int status; |
|
|
|
/* {read,write}_c0_ebase_64() may be UNDEFINED prior to r6 */ |
|
ebase = cpu_has_mips64r6 ? read_c0_ebase_64() |
|
: (s32)read_c0_ebase(); |
|
if (ebase & MIPS_EBASE_WG) { |
|
/* WG bit already set, we can avoid the clumsy probe */ |
|
c->options |= MIPS_CPU_EBASE_WG; |
|
} else { |
|
/* Its UNDEFINED to change EBase while BEV=0 */ |
|
status = read_c0_status(); |
|
write_c0_status(status | ST0_BEV); |
|
irq_enable_hazard(); |
|
/* |
|
* On pre-r6 cores, this may well clobber the upper bits |
|
* of EBase. This is hard to avoid without potentially |
|
* hitting UNDEFINED dm*c0 behaviour if EBase is 32-bit. |
|
*/ |
|
if (cpu_has_mips64r6) |
|
write_c0_ebase_64(ebase | MIPS_EBASE_WG); |
|
else |
|
write_c0_ebase(ebase | MIPS_EBASE_WG); |
|
back_to_back_c0_hazard(); |
|
/* Restore BEV */ |
|
write_c0_status(status); |
|
if (read_c0_ebase() & MIPS_EBASE_WG) { |
|
c->options |= MIPS_CPU_EBASE_WG; |
|
write_c0_ebase(ebase); |
|
} |
|
} |
|
} |
|
|
|
/* configure the FTLB write probability */ |
|
set_ftlb_enable(c, (mips_ftlb_disabled ? 0 : FTLB_EN) | FTLB_SET_PROB); |
|
|
|
mips_probe_watch_registers(c); |
|
|
|
#ifndef CONFIG_MIPS_CPS |
|
if (cpu_has_mips_r2_r6) { |
|
unsigned int core; |
|
|
|
core = get_ebase_cpunum(); |
|
if (cpu_has_mipsmt) |
|
core >>= fls(core_nvpes()) - 1; |
|
cpu_set_core(c, core); |
|
} |
|
#endif |
|
} |
|
|
|
/* |
|
* Probe for certain guest capabilities by writing config bits and reading back. |
|
* Finally write back the original value. |
|
*/ |
|
#define probe_gc0_config(name, maxconf, bits) \ |
|
do { \ |
|
unsigned int tmp; \ |
|
tmp = read_gc0_##name(); \ |
|
write_gc0_##name(tmp | (bits)); \ |
|
back_to_back_c0_hazard(); \ |
|
maxconf = read_gc0_##name(); \ |
|
write_gc0_##name(tmp); \ |
|
} while (0) |
|
|
|
/* |
|
* Probe for dynamic guest capabilities by changing certain config bits and |
|
* reading back to see if they change. Finally write back the original value. |
|
*/ |
|
#define probe_gc0_config_dyn(name, maxconf, dynconf, bits) \ |
|
do { \ |
|
maxconf = read_gc0_##name(); \ |
|
write_gc0_##name(maxconf ^ (bits)); \ |
|
back_to_back_c0_hazard(); \ |
|
dynconf = maxconf ^ read_gc0_##name(); \ |
|
write_gc0_##name(maxconf); \ |
|
maxconf |= dynconf; \ |
|
} while (0) |
|
|
|
static inline unsigned int decode_guest_config0(struct cpuinfo_mips *c) |
|
{ |
|
unsigned int config0; |
|
|
|
probe_gc0_config(config, config0, MIPS_CONF_M); |
|
|
|
if (config0 & MIPS_CONF_M) |
|
c->guest.conf |= BIT(1); |
|
return config0 & MIPS_CONF_M; |
|
} |
|
|
|
static inline unsigned int decode_guest_config1(struct cpuinfo_mips *c) |
|
{ |
|
unsigned int config1, config1_dyn; |
|
|
|
probe_gc0_config_dyn(config1, config1, config1_dyn, |
|
MIPS_CONF_M | MIPS_CONF1_PC | MIPS_CONF1_WR | |
|
MIPS_CONF1_FP); |
|
|
|
if (config1 & MIPS_CONF1_FP) |
|
c->guest.options |= MIPS_CPU_FPU; |
|
if (config1_dyn & MIPS_CONF1_FP) |
|
c->guest.options_dyn |= MIPS_CPU_FPU; |
|
|
|
if (config1 & MIPS_CONF1_WR) |
|
c->guest.options |= MIPS_CPU_WATCH; |
|
if (config1_dyn & MIPS_CONF1_WR) |
|
c->guest.options_dyn |= MIPS_CPU_WATCH; |
|
|
|
if (config1 & MIPS_CONF1_PC) |
|
c->guest.options |= MIPS_CPU_PERF; |
|
if (config1_dyn & MIPS_CONF1_PC) |
|
c->guest.options_dyn |= MIPS_CPU_PERF; |
|
|
|
if (config1 & MIPS_CONF_M) |
|
c->guest.conf |= BIT(2); |
|
return config1 & MIPS_CONF_M; |
|
} |
|
|
|
static inline unsigned int decode_guest_config2(struct cpuinfo_mips *c) |
|
{ |
|
unsigned int config2; |
|
|
|
probe_gc0_config(config2, config2, MIPS_CONF_M); |
|
|
|
if (config2 & MIPS_CONF_M) |
|
c->guest.conf |= BIT(3); |
|
return config2 & MIPS_CONF_M; |
|
} |
|
|
|
static inline unsigned int decode_guest_config3(struct cpuinfo_mips *c) |
|
{ |
|
unsigned int config3, config3_dyn; |
|
|
|
probe_gc0_config_dyn(config3, config3, config3_dyn, |
|
MIPS_CONF_M | MIPS_CONF3_MSA | MIPS_CONF3_ULRI | |
|
MIPS_CONF3_CTXTC); |
|
|
|
if (config3 & MIPS_CONF3_CTXTC) |
|
c->guest.options |= MIPS_CPU_CTXTC; |
|
if (config3_dyn & MIPS_CONF3_CTXTC) |
|
c->guest.options_dyn |= MIPS_CPU_CTXTC; |
|
|
|
if (config3 & MIPS_CONF3_PW) |
|
c->guest.options |= MIPS_CPU_HTW; |
|
|
|
if (config3 & MIPS_CONF3_ULRI) |
|
c->guest.options |= MIPS_CPU_ULRI; |
|
|
|
if (config3 & MIPS_CONF3_SC) |
|
c->guest.options |= MIPS_CPU_SEGMENTS; |
|
|
|
if (config3 & MIPS_CONF3_BI) |
|
c->guest.options |= MIPS_CPU_BADINSTR; |
|
if (config3 & MIPS_CONF3_BP) |
|
c->guest.options |= MIPS_CPU_BADINSTRP; |
|
|
|
if (config3 & MIPS_CONF3_MSA) |
|
c->guest.ases |= MIPS_ASE_MSA; |
|
if (config3_dyn & MIPS_CONF3_MSA) |
|
c->guest.ases_dyn |= MIPS_ASE_MSA; |
|
|
|
if (config3 & MIPS_CONF_M) |
|
c->guest.conf |= BIT(4); |
|
return config3 & MIPS_CONF_M; |
|
} |
|
|
|
static inline unsigned int decode_guest_config4(struct cpuinfo_mips *c) |
|
{ |
|
unsigned int config4; |
|
|
|
probe_gc0_config(config4, config4, |
|
MIPS_CONF_M | MIPS_CONF4_KSCREXIST); |
|
|
|
c->guest.kscratch_mask = (config4 & MIPS_CONF4_KSCREXIST) |
|
>> MIPS_CONF4_KSCREXIST_SHIFT; |
|
|
|
if (config4 & MIPS_CONF_M) |
|
c->guest.conf |= BIT(5); |
|
return config4 & MIPS_CONF_M; |
|
} |
|
|
|
static inline unsigned int decode_guest_config5(struct cpuinfo_mips *c) |
|
{ |
|
unsigned int config5, config5_dyn; |
|
|
|
probe_gc0_config_dyn(config5, config5, config5_dyn, |
|
MIPS_CONF_M | MIPS_CONF5_MVH | MIPS_CONF5_MRP); |
|
|
|
if (config5 & MIPS_CONF5_MRP) |
|
c->guest.options |= MIPS_CPU_MAAR; |
|
if (config5_dyn & MIPS_CONF5_MRP) |
|
c->guest.options_dyn |= MIPS_CPU_MAAR; |
|
|
|
if (config5 & MIPS_CONF5_LLB) |
|
c->guest.options |= MIPS_CPU_RW_LLB; |
|
|
|
if (config5 & MIPS_CONF5_MVH) |
|
c->guest.options |= MIPS_CPU_MVH; |
|
|
|
if (config5 & MIPS_CONF_M) |
|
c->guest.conf |= BIT(6); |
|
return config5 & MIPS_CONF_M; |
|
} |
|
|
|
static inline void decode_guest_configs(struct cpuinfo_mips *c) |
|
{ |
|
unsigned int ok; |
|
|
|
ok = decode_guest_config0(c); |
|
if (ok) |
|
ok = decode_guest_config1(c); |
|
if (ok) |
|
ok = decode_guest_config2(c); |
|
if (ok) |
|
ok = decode_guest_config3(c); |
|
if (ok) |
|
ok = decode_guest_config4(c); |
|
if (ok) |
|
decode_guest_config5(c); |
|
} |
|
|
|
static inline void cpu_probe_guestctl0(struct cpuinfo_mips *c) |
|
{ |
|
unsigned int guestctl0, temp; |
|
|
|
guestctl0 = read_c0_guestctl0(); |
|
|
|
if (guestctl0 & MIPS_GCTL0_G0E) |
|
c->options |= MIPS_CPU_GUESTCTL0EXT; |
|
if (guestctl0 & MIPS_GCTL0_G1) |
|
c->options |= MIPS_CPU_GUESTCTL1; |
|
if (guestctl0 & MIPS_GCTL0_G2) |
|
c->options |= MIPS_CPU_GUESTCTL2; |
|
if (!(guestctl0 & MIPS_GCTL0_RAD)) { |
|
c->options |= MIPS_CPU_GUESTID; |
|
|
|
/* |
|
* Probe for Direct Root to Guest (DRG). Set GuestCtl1.RID = 0 |
|
* first, otherwise all data accesses will be fully virtualised |
|
* as if they were performed by guest mode. |
|
*/ |
|
write_c0_guestctl1(0); |
|
tlbw_use_hazard(); |
|
|
|
write_c0_guestctl0(guestctl0 | MIPS_GCTL0_DRG); |
|
back_to_back_c0_hazard(); |
|
temp = read_c0_guestctl0(); |
|
|
|
if (temp & MIPS_GCTL0_DRG) { |
|
write_c0_guestctl0(guestctl0); |
|
c->options |= MIPS_CPU_DRG; |
|
} |
|
} |
|
} |
|
|
|
static inline void cpu_probe_guestctl1(struct cpuinfo_mips *c) |
|
{ |
|
if (cpu_has_guestid) { |
|
/* determine the number of bits of GuestID available */ |
|
write_c0_guestctl1(MIPS_GCTL1_ID); |
|
back_to_back_c0_hazard(); |
|
c->guestid_mask = (read_c0_guestctl1() & MIPS_GCTL1_ID) |
|
>> MIPS_GCTL1_ID_SHIFT; |
|
write_c0_guestctl1(0); |
|
} |
|
} |
|
|
|
static inline void cpu_probe_gtoffset(struct cpuinfo_mips *c) |
|
{ |
|
/* determine the number of bits of GTOffset available */ |
|
write_c0_gtoffset(0xffffffff); |
|
back_to_back_c0_hazard(); |
|
c->gtoffset_mask = read_c0_gtoffset(); |
|
write_c0_gtoffset(0); |
|
} |
|
|
|
static inline void cpu_probe_vz(struct cpuinfo_mips *c) |
|
{ |
|
cpu_probe_guestctl0(c); |
|
if (cpu_has_guestctl1) |
|
cpu_probe_guestctl1(c); |
|
|
|
cpu_probe_gtoffset(c); |
|
|
|
decode_guest_configs(c); |
|
} |
|
|
|
#define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \ |
|
| MIPS_CPU_COUNTER) |
|
|
|
static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu) |
|
{ |
|
switch (c->processor_id & PRID_IMP_MASK) { |
|
case PRID_IMP_R2000: |
|
c->cputype = CPU_R2000; |
|
__cpu_name[cpu] = "R2000"; |
|
c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS; |
|
c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE | |
|
MIPS_CPU_NOFPUEX; |
|
if (__cpu_has_fpu()) |
|
c->options |= MIPS_CPU_FPU; |
|
c->tlbsize = 64; |
|
break; |
|
case PRID_IMP_R3000: |
|
if ((c->processor_id & PRID_REV_MASK) == PRID_REV_R3000A) { |
|
if (cpu_has_confreg()) { |
|
c->cputype = CPU_R3081E; |
|
__cpu_name[cpu] = "R3081"; |
|
} else { |
|
c->cputype = CPU_R3000A; |
|
__cpu_name[cpu] = "R3000A"; |
|
} |
|
} else { |
|
c->cputype = CPU_R3000; |
|
__cpu_name[cpu] = "R3000"; |
|
} |
|
c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS; |
|
c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE | |
|
MIPS_CPU_NOFPUEX; |
|
if (__cpu_has_fpu()) |
|
c->options |= MIPS_CPU_FPU; |
|
c->tlbsize = 64; |
|
break; |
|
case PRID_IMP_R4000: |
|
if (read_c0_config() & CONF_SC) { |
|
if ((c->processor_id & PRID_REV_MASK) >= |
|
PRID_REV_R4400) { |
|
c->cputype = CPU_R4400PC; |
|
__cpu_name[cpu] = "R4400PC"; |
|
} else { |
|
c->cputype = CPU_R4000PC; |
|
__cpu_name[cpu] = "R4000PC"; |
|
} |
|
} else { |
|
int cca = read_c0_config() & CONF_CM_CMASK; |
|
int mc; |
|
|
|
/* |
|
* SC and MC versions can't be reliably told apart, |
|
* but only the latter support coherent caching |
|
* modes so assume the firmware has set the KSEG0 |
|
* coherency attribute reasonably (if uncached, we |
|
* assume SC). |
|
*/ |
|
switch (cca) { |
|
case CONF_CM_CACHABLE_CE: |
|
case CONF_CM_CACHABLE_COW: |
|
case CONF_CM_CACHABLE_CUW: |
|
mc = 1; |
|
break; |
|
default: |
|
mc = 0; |
|
break; |
|
} |
|
if ((c->processor_id & PRID_REV_MASK) >= |
|
PRID_REV_R4400) { |
|
c->cputype = mc ? CPU_R4400MC : CPU_R4400SC; |
|
__cpu_name[cpu] = mc ? "R4400MC" : "R4400SC"; |
|
} else { |
|
c->cputype = mc ? CPU_R4000MC : CPU_R4000SC; |
|
__cpu_name[cpu] = mc ? "R4000MC" : "R4000SC"; |
|
} |
|
} |
|
|
|
set_isa(c, MIPS_CPU_ISA_III); |
|
c->fpu_msk31 |= FPU_CSR_CONDX; |
|
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | |
|
MIPS_CPU_WATCH | MIPS_CPU_VCE | |
|
MIPS_CPU_LLSC; |
|
c->tlbsize = 48; |
|
break; |
|
case PRID_IMP_VR41XX: |
|
set_isa(c, MIPS_CPU_ISA_III); |
|
c->fpu_msk31 |= FPU_CSR_CONDX; |
|
c->options = R4K_OPTS; |
|
c->tlbsize = 32; |
|
switch (c->processor_id & 0xf0) { |
|
case PRID_REV_VR4111: |
|
c->cputype = CPU_VR4111; |
|
__cpu_name[cpu] = "NEC VR4111"; |
|
break; |
|
case PRID_REV_VR4121: |
|
c->cputype = CPU_VR4121; |
|
__cpu_name[cpu] = "NEC VR4121"; |
|
break; |
|
case PRID_REV_VR4122: |
|
if ((c->processor_id & 0xf) < 0x3) { |
|
c->cputype = CPU_VR4122; |
|
__cpu_name[cpu] = "NEC VR4122"; |
|
} else { |
|
c->cputype = CPU_VR4181A; |
|
__cpu_name[cpu] = "NEC VR4181A"; |
|
} |
|
break; |
|
case PRID_REV_VR4130: |
|
if ((c->processor_id & 0xf) < 0x4) { |
|
c->cputype = CPU_VR4131; |
|
__cpu_name[cpu] = "NEC VR4131"; |
|
} else { |
|
c->cputype = CPU_VR4133; |
|
c->options |= MIPS_CPU_LLSC; |
|
__cpu_name[cpu] = "NEC VR4133"; |
|
} |
|
break; |
|
default: |
|
printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n"); |
|
c->cputype = CPU_VR41XX; |
|
__cpu_name[cpu] = "NEC Vr41xx"; |
|
break; |
|
} |
|
break; |
|
case PRID_IMP_R4300: |
|
c->cputype = CPU_R4300; |
|
__cpu_name[cpu] = "R4300"; |
|
set_isa(c, MIPS_CPU_ISA_III); |
|
c->fpu_msk31 |= FPU_CSR_CONDX; |
|
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | |
|
MIPS_CPU_LLSC; |
|
c->tlbsize = 32; |
|
break; |
|
case PRID_IMP_R4600: |
|
c->cputype = CPU_R4600; |
|
__cpu_name[cpu] = "R4600"; |
|
set_isa(c, MIPS_CPU_ISA_III); |
|
c->fpu_msk31 |= FPU_CSR_CONDX; |
|
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | |
|
MIPS_CPU_LLSC; |
|
c->tlbsize = 48; |
|
break; |
|
#if 0 |
|
case PRID_IMP_R4650: |
|
/* |
|
* This processor doesn't have an MMU, so it's not |
|
* "real easy" to run Linux on it. It is left purely |
|
* for documentation. Commented out because it shares |
|
* it's c0_prid id number with the TX3900. |
|
*/ |
|
c->cputype = CPU_R4650; |
|
__cpu_name[cpu] = "R4650"; |
|
set_isa(c, MIPS_CPU_ISA_III); |
|
c->fpu_msk31 |= FPU_CSR_CONDX; |
|
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC; |
|
c->tlbsize = 48; |
|
break; |
|
#endif |
|
case PRID_IMP_TX39: |
|
c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS; |
|
c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE; |
|
|
|
if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) { |
|
c->cputype = CPU_TX3927; |
|
__cpu_name[cpu] = "TX3927"; |
|
c->tlbsize = 64; |
|
} else { |
|
switch (c->processor_id & PRID_REV_MASK) { |
|
case PRID_REV_TX3912: |
|
c->cputype = CPU_TX3912; |
|
__cpu_name[cpu] = "TX3912"; |
|
c->tlbsize = 32; |
|
break; |
|
case PRID_REV_TX3922: |
|
c->cputype = CPU_TX3922; |
|
__cpu_name[cpu] = "TX3922"; |
|
c->tlbsize = 64; |
|
break; |
|
} |
|
} |
|
break; |
|
case PRID_IMP_R4700: |
|
c->cputype = CPU_R4700; |
|
__cpu_name[cpu] = "R4700"; |
|
set_isa(c, MIPS_CPU_ISA_III); |
|
c->fpu_msk31 |= FPU_CSR_CONDX; |
|
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | |
|
MIPS_CPU_LLSC; |
|
c->tlbsize = 48; |
|
break; |
|
case PRID_IMP_TX49: |
|
c->cputype = CPU_TX49XX; |
|
__cpu_name[cpu] = "R49XX"; |
|
set_isa(c, MIPS_CPU_ISA_III); |
|
c->fpu_msk31 |= FPU_CSR_CONDX; |
|
c->options = R4K_OPTS | MIPS_CPU_LLSC; |
|
if (!(c->processor_id & 0x08)) |
|
c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR; |
|
c->tlbsize = 48; |
|
break; |
|
case PRID_IMP_R5000: |
|
c->cputype = CPU_R5000; |
|
__cpu_name[cpu] = "R5000"; |
|
set_isa(c, MIPS_CPU_ISA_IV); |
|
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | |
|
MIPS_CPU_LLSC; |
|
c->tlbsize = 48; |
|
break; |
|
case PRID_IMP_R5500: |
|
c->cputype = CPU_R5500; |
|
__cpu_name[cpu] = "R5500"; |
|
set_isa(c, MIPS_CPU_ISA_IV); |
|
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | |
|
MIPS_CPU_WATCH | MIPS_CPU_LLSC; |
|
c->tlbsize = 48; |
|
break; |
|
case PRID_IMP_NEVADA: |
|
c->cputype = CPU_NEVADA; |
|
__cpu_name[cpu] = "Nevada"; |
|
set_isa(c, MIPS_CPU_ISA_IV); |
|
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | |
|
MIPS_CPU_DIVEC | MIPS_CPU_LLSC; |
|
c->tlbsize = 48; |
|
break; |
|
case PRID_IMP_RM7000: |
|
c->cputype = CPU_RM7000; |
|
__cpu_name[cpu] = "RM7000"; |
|
set_isa(c, MIPS_CPU_ISA_IV); |
|
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | |
|
MIPS_CPU_LLSC; |
|
/* |
|
* Undocumented RM7000: Bit 29 in the info register of |
|
* the RM7000 v2.0 indicates if the TLB has 48 or 64 |
|
* entries. |
|
* |
|
* 29 1 => 64 entry JTLB |
|
* 0 => 48 entry JTLB |
|
*/ |
|
c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48; |
|
break; |
|
case PRID_IMP_R10000: |
|
c->cputype = CPU_R10000; |
|
__cpu_name[cpu] = "R10000"; |
|
set_isa(c, MIPS_CPU_ISA_IV); |
|
c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX | |
|
MIPS_CPU_FPU | MIPS_CPU_32FPR | |
|
MIPS_CPU_COUNTER | MIPS_CPU_WATCH | |
|
MIPS_CPU_LLSC; |
|
c->tlbsize = 64; |
|
break; |
|
case PRID_IMP_R12000: |
|
c->cputype = CPU_R12000; |
|
__cpu_name[cpu] = "R12000"; |
|
set_isa(c, MIPS_CPU_ISA_IV); |
|
c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX | |
|
MIPS_CPU_FPU | MIPS_CPU_32FPR | |
|
MIPS_CPU_COUNTER | MIPS_CPU_WATCH | |
|
MIPS_CPU_LLSC; |
|
c->tlbsize = 64; |
|
write_c0_r10k_diag(read_c0_r10k_diag() | R10K_DIAG_E_GHIST); |
|
break; |
|
case PRID_IMP_R14000: |
|
if (((c->processor_id >> 4) & 0x0f) > 2) { |
|
c->cputype = CPU_R16000; |
|
__cpu_name[cpu] = "R16000"; |
|
} else { |
|
c->cputype = CPU_R14000; |
|
__cpu_name[cpu] = "R14000"; |
|
} |
|
set_isa(c, MIPS_CPU_ISA_IV); |
|
c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX | |
|
MIPS_CPU_FPU | MIPS_CPU_32FPR | |
|
MIPS_CPU_COUNTER | MIPS_CPU_WATCH | |
|
MIPS_CPU_LLSC; |
|
c->tlbsize = 64; |
|
write_c0_r10k_diag(read_c0_r10k_diag() | R10K_DIAG_E_GHIST); |
|
break; |
|
case PRID_IMP_LOONGSON_64C: /* Loongson-2/3 */ |
|
switch (c->processor_id & PRID_REV_MASK) { |
|
case PRID_REV_LOONGSON2E: |
|
c->cputype = CPU_LOONGSON2EF; |
|
__cpu_name[cpu] = "ICT Loongson-2"; |
|
set_elf_platform(cpu, "loongson2e"); |
|
set_isa(c, MIPS_CPU_ISA_III); |
|
c->fpu_msk31 |= FPU_CSR_CONDX; |
|
break; |
|
case PRID_REV_LOONGSON2F: |
|
c->cputype = CPU_LOONGSON2EF; |
|
__cpu_name[cpu] = "ICT Loongson-2"; |
|
set_elf_platform(cpu, "loongson2f"); |
|
set_isa(c, MIPS_CPU_ISA_III); |
|
c->fpu_msk31 |= FPU_CSR_CONDX; |
|
break; |
|
case PRID_REV_LOONGSON3A_R1: |
|
c->cputype = CPU_LOONGSON64; |
|
__cpu_name[cpu] = "ICT Loongson-3"; |
|
set_elf_platform(cpu, "loongson3a"); |
|
set_isa(c, MIPS_CPU_ISA_M64R1); |
|
c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM | |
|
MIPS_ASE_LOONGSON_EXT); |
|
break; |
|
case PRID_REV_LOONGSON3B_R1: |
|
case PRID_REV_LOONGSON3B_R2: |
|
c->cputype = CPU_LOONGSON64; |
|
__cpu_name[cpu] = "ICT Loongson-3"; |
|
set_elf_platform(cpu, "loongson3b"); |
|
set_isa(c, MIPS_CPU_ISA_M64R1); |
|
c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM | |
|
MIPS_ASE_LOONGSON_EXT); |
|
break; |
|
} |
|
|
|
c->options = R4K_OPTS | |
|
MIPS_CPU_FPU | MIPS_CPU_LLSC | |
|
MIPS_CPU_32FPR; |
|
c->tlbsize = 64; |
|
set_cpu_asid_mask(c, MIPS_ENTRYHI_ASID); |
|
c->writecombine = _CACHE_UNCACHED_ACCELERATED; |
|
break; |
|
case PRID_IMP_LOONGSON_32: /* Loongson-1 */ |
|
decode_configs(c); |
|
|
|
c->cputype = CPU_LOONGSON32; |
|
|
|
switch (c->processor_id & PRID_REV_MASK) { |
|
case PRID_REV_LOONGSON1B: |
|
__cpu_name[cpu] = "Loongson 1B"; |
|
break; |
|
} |
|
|
|
break; |
|
} |
|
} |
|
|
|
static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu) |
|
{ |
|
c->writecombine = _CACHE_UNCACHED_ACCELERATED; |
|
switch (c->processor_id & PRID_IMP_MASK) { |
|
case PRID_IMP_QEMU_GENERIC: |
|
c->writecombine = _CACHE_UNCACHED; |
|
c->cputype = CPU_QEMU_GENERIC; |
|
__cpu_name[cpu] = "MIPS GENERIC QEMU"; |
|
break; |
|
case PRID_IMP_4KC: |
|
c->cputype = CPU_4KC; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS 4Kc"; |
|
break; |
|
case PRID_IMP_4KEC: |
|
case PRID_IMP_4KECR2: |
|
c->cputype = CPU_4KEC; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS 4KEc"; |
|
break; |
|
case PRID_IMP_4KSC: |
|
case PRID_IMP_4KSD: |
|
c->cputype = CPU_4KSC; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS 4KSc"; |
|
break; |
|
case PRID_IMP_5KC: |
|
c->cputype = CPU_5KC; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS 5Kc"; |
|
break; |
|
case PRID_IMP_5KE: |
|
c->cputype = CPU_5KE; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS 5KE"; |
|
break; |
|
case PRID_IMP_20KC: |
|
c->cputype = CPU_20KC; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS 20Kc"; |
|
break; |
|
case PRID_IMP_24K: |
|
c->cputype = CPU_24K; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS 24Kc"; |
|
break; |
|
case PRID_IMP_24KE: |
|
c->cputype = CPU_24K; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS 24KEc"; |
|
break; |
|
case PRID_IMP_25KF: |
|
c->cputype = CPU_25KF; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS 25Kc"; |
|
break; |
|
case PRID_IMP_34K: |
|
c->cputype = CPU_34K; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS 34Kc"; |
|
cpu_set_mt_per_tc_perf(c); |
|
break; |
|
case PRID_IMP_74K: |
|
c->cputype = CPU_74K; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS 74Kc"; |
|
break; |
|
case PRID_IMP_M14KC: |
|
c->cputype = CPU_M14KC; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS M14Kc"; |
|
break; |
|
case PRID_IMP_M14KEC: |
|
c->cputype = CPU_M14KEC; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS M14KEc"; |
|
break; |
|
case PRID_IMP_1004K: |
|
c->cputype = CPU_1004K; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS 1004Kc"; |
|
cpu_set_mt_per_tc_perf(c); |
|
break; |
|
case PRID_IMP_1074K: |
|
c->cputype = CPU_1074K; |
|
c->writecombine = _CACHE_UNCACHED; |
|
__cpu_name[cpu] = "MIPS 1074Kc"; |
|
break; |
|
case PRID_IMP_INTERAPTIV_UP: |
|
c->cputype = CPU_INTERAPTIV; |
|
__cpu_name[cpu] = "MIPS interAptiv"; |
|
cpu_set_mt_per_tc_perf(c); |
|
break; |
|
case PRID_IMP_INTERAPTIV_MP: |
|
c->cputype = CPU_INTERAPTIV; |
|
__cpu_name[cpu] = "MIPS interAptiv (multi)"; |
|
cpu_set_mt_per_tc_perf(c); |
|
break; |
|
case PRID_IMP_PROAPTIV_UP: |
|
c->cputype = CPU_PROAPTIV; |
|
__cpu_name[cpu] = "MIPS proAptiv"; |
|
break; |
|
case PRID_IMP_PROAPTIV_MP: |
|
c->cputype = CPU_PROAPTIV; |
|
__cpu_name[cpu] = "MIPS proAptiv (multi)"; |
|
break; |
|
case PRID_IMP_P5600: |
|
c->cputype = CPU_P5600; |
|
__cpu_name[cpu] = "MIPS P5600"; |
|
break; |
|
case PRID_IMP_P6600: |
|
c->cputype = CPU_P6600; |
|
__cpu_name[cpu] = "MIPS P6600"; |
|
break; |
|
case PRID_IMP_I6400: |
|
c->cputype = CPU_I6400; |
|
__cpu_name[cpu] = "MIPS I6400"; |
|
break; |
|
case PRID_IMP_I6500: |
|
c->cputype = CPU_I6500; |
|
__cpu_name[cpu] = "MIPS I6500"; |
|
break; |
|
case PRID_IMP_M5150: |
|
c->cputype = CPU_M5150; |
|
__cpu_name[cpu] = "MIPS M5150"; |
|
break; |
|
case PRID_IMP_M6250: |
|
c->cputype = CPU_M6250; |
|
__cpu_name[cpu] = "MIPS M6250"; |
|
break; |
|
} |
|
|
|
decode_configs(c); |
|
|
|
spram_config(); |
|
|
|
mm_config(c); |
|
|
|
switch (__get_cpu_type(c->cputype)) { |
|
case CPU_M5150: |
|
case CPU_P5600: |
|
set_isa(c, MIPS_CPU_ISA_M32R5); |
|
break; |
|
case CPU_I6500: |
|
c->options |= MIPS_CPU_SHARED_FTLB_ENTRIES; |
|
fallthrough; |
|
case CPU_I6400: |
|
c->options |= MIPS_CPU_SHARED_FTLB_RAM; |
|
fallthrough; |
|
default: |
|
break; |
|
} |
|
|
|
/* Recent MIPS cores use the implementation-dependent ExcCode 16 for |
|
* cache/FTLB parity exceptions. |
|
*/ |
|
switch (__get_cpu_type(c->cputype)) { |
|
case CPU_PROAPTIV: |
|
case CPU_P5600: |
|
case CPU_P6600: |
|
case CPU_I6400: |
|
case CPU_I6500: |
|
c->options |= MIPS_CPU_FTLBPAREX; |
|
break; |
|
} |
|
} |
|
|
|
static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu) |
|
{ |
|
decode_configs(c); |
|
switch (c->processor_id & PRID_IMP_MASK) { |
|
case PRID_IMP_AU1_REV1: |
|
case PRID_IMP_AU1_REV2: |
|
c->cputype = CPU_ALCHEMY; |
|
switch ((c->processor_id >> 24) & 0xff) { |
|
case 0: |
|
__cpu_name[cpu] = "Au1000"; |
|
break; |
|
case 1: |
|
__cpu_name[cpu] = "Au1500"; |
|
break; |
|
case 2: |
|
__cpu_name[cpu] = "Au1100"; |
|
break; |
|
case 3: |
|
__cpu_name[cpu] = "Au1550"; |
|
break; |
|
case 4: |
|
__cpu_name[cpu] = "Au1200"; |
|
if ((c->processor_id & PRID_REV_MASK) == 2) |
|
__cpu_name[cpu] = "Au1250"; |
|
break; |
|
case 5: |
|
__cpu_name[cpu] = "Au1210"; |
|
break; |
|
default: |
|
__cpu_name[cpu] = "Au1xxx"; |
|
break; |
|
} |
|
break; |
|
} |
|
} |
|
|
|
static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu) |
|
{ |
|
decode_configs(c); |
|
|
|
c->writecombine = _CACHE_UNCACHED_ACCELERATED; |
|
switch (c->processor_id & PRID_IMP_MASK) { |
|
case PRID_IMP_SB1: |
|
c->cputype = CPU_SB1; |
|
__cpu_name[cpu] = "SiByte SB1"; |
|
/* FPU in pass1 is known to have issues. */ |
|
if ((c->processor_id & PRID_REV_MASK) < 0x02) |
|
c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR); |
|
break; |
|
case PRID_IMP_SB1A: |
|
c->cputype = CPU_SB1A; |
|
__cpu_name[cpu] = "SiByte SB1A"; |
|
break; |
|
} |
|
} |
|
|
|
static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu) |
|
{ |
|
decode_configs(c); |
|
switch (c->processor_id & PRID_IMP_MASK) { |
|
case PRID_IMP_SR71000: |
|
c->cputype = CPU_SR71000; |
|
__cpu_name[cpu] = "Sandcraft SR71000"; |
|
c->scache.ways = 8; |
|
c->tlbsize = 64; |
|
break; |
|
} |
|
} |
|
|
|
static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu) |
|
{ |
|
decode_configs(c); |
|
switch (c->processor_id & PRID_IMP_MASK) { |
|
case PRID_IMP_PR4450: |
|
c->cputype = CPU_PR4450; |
|
__cpu_name[cpu] = "Philips PR4450"; |
|
set_isa(c, MIPS_CPU_ISA_M32R1); |
|
break; |
|
} |
|
} |
|
|
|
static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu) |
|
{ |
|
decode_configs(c); |
|
switch (c->processor_id & PRID_IMP_MASK) { |
|
case PRID_IMP_BMIPS32_REV4: |
|
case PRID_IMP_BMIPS32_REV8: |
|
c->cputype = CPU_BMIPS32; |
|
__cpu_name[cpu] = "Broadcom BMIPS32"; |
|
set_elf_platform(cpu, "bmips32"); |
|
break; |
|
case PRID_IMP_BMIPS3300: |
|
case PRID_IMP_BMIPS3300_ALT: |
|
case PRID_IMP_BMIPS3300_BUG: |
|
c->cputype = CPU_BMIPS3300; |
|
__cpu_name[cpu] = "Broadcom BMIPS3300"; |
|
set_elf_platform(cpu, "bmips3300"); |
|
reserve_exception_space(0x400, VECTORSPACING * 64); |
|
break; |
|
case PRID_IMP_BMIPS43XX: { |
|
int rev = c->processor_id & PRID_REV_MASK; |
|
|
|
if (rev >= PRID_REV_BMIPS4380_LO && |
|
rev <= PRID_REV_BMIPS4380_HI) { |
|
c->cputype = CPU_BMIPS4380; |
|
__cpu_name[cpu] = "Broadcom BMIPS4380"; |
|
set_elf_platform(cpu, "bmips4380"); |
|
c->options |= MIPS_CPU_RIXI; |
|
reserve_exception_space(0x400, VECTORSPACING * 64); |
|
} else { |
|
c->cputype = CPU_BMIPS4350; |
|
__cpu_name[cpu] = "Broadcom BMIPS4350"; |
|
set_elf_platform(cpu, "bmips4350"); |
|
} |
|
break; |
|
} |
|
case PRID_IMP_BMIPS5000: |
|
case PRID_IMP_BMIPS5200: |
|
c->cputype = CPU_BMIPS5000; |
|
if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_BMIPS5200) |
|
__cpu_name[cpu] = "Broadcom BMIPS5200"; |
|
else |
|
__cpu_name[cpu] = "Broadcom BMIPS5000"; |
|
set_elf_platform(cpu, "bmips5000"); |
|
c->options |= MIPS_CPU_ULRI | MIPS_CPU_RIXI; |
|
reserve_exception_space(0x1000, VECTORSPACING * 64); |
|
break; |
|
} |
|
} |
|
|
|
static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu) |
|
{ |
|
decode_configs(c); |
|
switch (c->processor_id & PRID_IMP_MASK) { |
|
case PRID_IMP_CAVIUM_CN38XX: |
|
case PRID_IMP_CAVIUM_CN31XX: |
|
case PRID_IMP_CAVIUM_CN30XX: |
|
c->cputype = CPU_CAVIUM_OCTEON; |
|
__cpu_name[cpu] = "Cavium Octeon"; |
|
goto platform; |
|
case PRID_IMP_CAVIUM_CN58XX: |
|
case PRID_IMP_CAVIUM_CN56XX: |
|
case PRID_IMP_CAVIUM_CN50XX: |
|
case PRID_IMP_CAVIUM_CN52XX: |
|
c->cputype = CPU_CAVIUM_OCTEON_PLUS; |
|
__cpu_name[cpu] = "Cavium Octeon+"; |
|
platform: |
|
set_elf_platform(cpu, "octeon"); |
|
break; |
|
case PRID_IMP_CAVIUM_CN61XX: |
|
case PRID_IMP_CAVIUM_CN63XX: |
|
case PRID_IMP_CAVIUM_CN66XX: |
|
case PRID_IMP_CAVIUM_CN68XX: |
|
case PRID_IMP_CAVIUM_CNF71XX: |
|
c->cputype = CPU_CAVIUM_OCTEON2; |
|
__cpu_name[cpu] = "Cavium Octeon II"; |
|
set_elf_platform(cpu, "octeon2"); |
|
break; |
|
case PRID_IMP_CAVIUM_CN70XX: |
|
case PRID_IMP_CAVIUM_CN73XX: |
|
case PRID_IMP_CAVIUM_CNF75XX: |
|
case PRID_IMP_CAVIUM_CN78XX: |
|
c->cputype = CPU_CAVIUM_OCTEON3; |
|
__cpu_name[cpu] = "Cavium Octeon III"; |
|
set_elf_platform(cpu, "octeon3"); |
|
break; |
|
default: |
|
printk(KERN_INFO "Unknown Octeon chip!\n"); |
|
c->cputype = CPU_UNKNOWN; |
|
break; |
|
} |
|
} |
|
|
|
#ifdef CONFIG_CPU_LOONGSON64 |
|
#include <loongson_regs.h> |
|
|
|
static inline void decode_cpucfg(struct cpuinfo_mips *c) |
|
{ |
|
u32 cfg1 = read_cpucfg(LOONGSON_CFG1); |
|
u32 cfg2 = read_cpucfg(LOONGSON_CFG2); |
|
u32 cfg3 = read_cpucfg(LOONGSON_CFG3); |
|
|
|
if (cfg1 & LOONGSON_CFG1_MMI) |
|
c->ases |= MIPS_ASE_LOONGSON_MMI; |
|
|
|
if (cfg2 & LOONGSON_CFG2_LEXT1) |
|
c->ases |= MIPS_ASE_LOONGSON_EXT; |
|
|
|
if (cfg2 & LOONGSON_CFG2_LEXT2) |
|
c->ases |= MIPS_ASE_LOONGSON_EXT2; |
|
|
|
if (cfg2 & LOONGSON_CFG2_LSPW) { |
|
c->options |= MIPS_CPU_LDPTE; |
|
c->guest.options |= MIPS_CPU_LDPTE; |
|
} |
|
|
|
if (cfg3 & LOONGSON_CFG3_LCAMP) |
|
c->ases |= MIPS_ASE_LOONGSON_CAM; |
|
} |
|
|
|
static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu) |
|
{ |
|
decode_configs(c); |
|
|
|
/* All Loongson processors covered here define ExcCode 16 as GSExc. */ |
|
c->options |= MIPS_CPU_GSEXCEX; |
|
|
|
switch (c->processor_id & PRID_IMP_MASK) { |
|
case PRID_IMP_LOONGSON_64R: /* Loongson-64 Reduced */ |
|
switch (c->processor_id & PRID_REV_MASK) { |
|
case PRID_REV_LOONGSON2K_R1_0: |
|
case PRID_REV_LOONGSON2K_R1_1: |
|
case PRID_REV_LOONGSON2K_R1_2: |
|
case PRID_REV_LOONGSON2K_R1_3: |
|
c->cputype = CPU_LOONGSON64; |
|
__cpu_name[cpu] = "Loongson-2K"; |
|
set_elf_platform(cpu, "gs264e"); |
|
set_isa(c, MIPS_CPU_ISA_M64R2); |
|
break; |
|
} |
|
c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_EXT | |
|
MIPS_ASE_LOONGSON_EXT2); |
|
break; |
|
case PRID_IMP_LOONGSON_64C: /* Loongson-3 Classic */ |
|
switch (c->processor_id & PRID_REV_MASK) { |
|
case PRID_REV_LOONGSON3A_R2_0: |
|
case PRID_REV_LOONGSON3A_R2_1: |
|
c->cputype = CPU_LOONGSON64; |
|
__cpu_name[cpu] = "ICT Loongson-3"; |
|
set_elf_platform(cpu, "loongson3a"); |
|
set_isa(c, MIPS_CPU_ISA_M64R2); |
|
break; |
|
case PRID_REV_LOONGSON3A_R3_0: |
|
case PRID_REV_LOONGSON3A_R3_1: |
|
c->cputype = CPU_LOONGSON64; |
|
__cpu_name[cpu] = "ICT Loongson-3"; |
|
set_elf_platform(cpu, "loongson3a"); |
|
set_isa(c, MIPS_CPU_ISA_M64R2); |
|
break; |
|
} |
|
/* |
|
* Loongson-3 Classic did not implement MIPS standard TLBINV |
|
* but implemented TLBINVF and EHINV. As currently we're only |
|
* using these two features, enable MIPS_CPU_TLBINV as well. |
|
* |
|
* Also some early Loongson-3A2000 had wrong TLB type in Config |
|
* register, we correct it here. |
|
*/ |
|
c->options |= MIPS_CPU_FTLB | MIPS_CPU_TLBINV | MIPS_CPU_LDPTE; |
|
c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM | |
|
MIPS_ASE_LOONGSON_EXT | MIPS_ASE_LOONGSON_EXT2); |
|
c->ases &= ~MIPS_ASE_VZ; /* VZ of Loongson-3A2000/3000 is incomplete */ |
|
break; |
|
case PRID_IMP_LOONGSON_64G: |
|
c->cputype = CPU_LOONGSON64; |
|
__cpu_name[cpu] = "ICT Loongson-3"; |
|
set_elf_platform(cpu, "loongson3a"); |
|
set_isa(c, MIPS_CPU_ISA_M64R2); |
|
decode_cpucfg(c); |
|
break; |
|
default: |
|
panic("Unknown Loongson Processor ID!"); |
|
break; |
|
} |
|
} |
|
#else |
|
static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu) { } |
|
#endif |
|
|
|
static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu) |
|
{ |
|
decode_configs(c); |
|
|
|
/* |
|
* XBurst misses a config2 register, so config3 decode was skipped in |
|
* decode_configs(). |
|
*/ |
|
decode_config3(c); |
|
|
|
/* XBurst does not implement the CP0 counter. */ |
|
c->options &= ~MIPS_CPU_COUNTER; |
|
BUG_ON(__builtin_constant_p(cpu_has_counter) && cpu_has_counter); |
|
|
|
/* XBurst has virtually tagged icache */ |
|
c->icache.flags |= MIPS_CACHE_VTAG; |
|
|
|
switch (c->processor_id & PRID_IMP_MASK) { |
|
|
|
/* XBurst®1 with MXU1.0/MXU1.1 SIMD ISA */ |
|
case PRID_IMP_XBURST_REV1: |
|
|
|
/* |
|
* The XBurst core by default attempts to avoid branch target |
|
* buffer lookups by detecting & special casing loops. This |
|
* feature will cause BogoMIPS and lpj calculate in error. |
|
* Set cp0 config7 bit 4 to disable this feature. |
|
*/ |
|
set_c0_config7(MIPS_CONF7_BTB_LOOP_EN); |
|
|
|
switch (c->processor_id & PRID_COMP_MASK) { |
|
|
|
/* |
|
* The config0 register in the XBurst CPUs with a processor ID of |
|
* PRID_COMP_INGENIC_D0 report themselves as MIPS32r2 compatible, |
|
* but they don't actually support this ISA. |
|
*/ |
|
case PRID_COMP_INGENIC_D0: |
|
c->isa_level &= ~MIPS_CPU_ISA_M32R2; |
|
fallthrough; |
|
|
|
/* |
|
* The config0 register in the XBurst CPUs with a processor ID of |
|
* PRID_COMP_INGENIC_D0 or PRID_COMP_INGENIC_D1 has an abandoned |
|
* huge page tlb mode, this mode is not compatible with the MIPS |
|
* standard, it will cause tlbmiss and into an infinite loop |
|
* (line 21 in the tlb-funcs.S) when starting the init process. |
|
* After chip reset, the default is HPTLB mode, Write 0xa9000000 |
|
* to cp0 register 5 sel 4 to switch back to VTLB mode to prevent |
|
* getting stuck. |
|
*/ |
|
case PRID_COMP_INGENIC_D1: |
|
write_c0_page_ctrl(XBURST_PAGECTRL_HPTLB_DIS); |
|
break; |
|
|
|
default: |
|
break; |
|
} |
|
fallthrough; |
|
|
|
/* XBurst®1 with MXU2.0 SIMD ISA */ |
|
case PRID_IMP_XBURST_REV2: |
|
/* Ingenic uses the WA bit to achieve write-combine memory writes */ |
|
c->writecombine = _CACHE_CACHABLE_WA; |
|
c->cputype = CPU_XBURST; |
|
__cpu_name[cpu] = "Ingenic XBurst"; |
|
break; |
|
|
|
/* XBurst®2 with MXU2.1 SIMD ISA */ |
|
case PRID_IMP_XBURST2: |
|
c->cputype = CPU_XBURST; |
|
__cpu_name[cpu] = "Ingenic XBurst II"; |
|
break; |
|
|
|
default: |
|
panic("Unknown Ingenic Processor ID!"); |
|
break; |
|
} |
|
} |
|
|
|
static inline void cpu_probe_netlogic(struct cpuinfo_mips *c, int cpu) |
|
{ |
|
decode_configs(c); |
|
|
|
if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_NETLOGIC_AU13XX) { |
|
c->cputype = CPU_ALCHEMY; |
|
__cpu_name[cpu] = "Au1300"; |
|
/* following stuff is not for Alchemy */ |
|
return; |
|
} |
|
|
|
c->options = (MIPS_CPU_TLB | |
|
MIPS_CPU_4KEX | |
|
MIPS_CPU_COUNTER | |
|
MIPS_CPU_DIVEC | |
|
MIPS_CPU_WATCH | |
|
MIPS_CPU_EJTAG | |
|
MIPS_CPU_LLSC); |
|
|
|
switch (c->processor_id & PRID_IMP_MASK) { |
|
case PRID_IMP_NETLOGIC_XLP2XX: |
|
case PRID_IMP_NETLOGIC_XLP9XX: |
|
case PRID_IMP_NETLOGIC_XLP5XX: |
|
c->cputype = CPU_XLP; |
|
__cpu_name[cpu] = "Broadcom XLPII"; |
|
break; |
|
|
|
case PRID_IMP_NETLOGIC_XLP8XX: |
|
case PRID_IMP_NETLOGIC_XLP3XX: |
|
c->cputype = CPU_XLP; |
|
__cpu_name[cpu] = "Netlogic XLP"; |
|
break; |
|
|
|
case PRID_IMP_NETLOGIC_XLR732: |
|
case PRID_IMP_NETLOGIC_XLR716: |
|
case PRID_IMP_NETLOGIC_XLR532: |
|
case PRID_IMP_NETLOGIC_XLR308: |
|
case PRID_IMP_NETLOGIC_XLR532C: |
|
case PRID_IMP_NETLOGIC_XLR516C: |
|
case PRID_IMP_NETLOGIC_XLR508C: |
|
case PRID_IMP_NETLOGIC_XLR308C: |
|
c->cputype = CPU_XLR; |
|
__cpu_name[cpu] = "Netlogic XLR"; |
|
break; |
|
|
|
case PRID_IMP_NETLOGIC_XLS608: |
|
case PRID_IMP_NETLOGIC_XLS408: |
|
case PRID_IMP_NETLOGIC_XLS404: |
|
case PRID_IMP_NETLOGIC_XLS208: |
|
case PRID_IMP_NETLOGIC_XLS204: |
|
case PRID_IMP_NETLOGIC_XLS108: |
|
case PRID_IMP_NETLOGIC_XLS104: |
|
case PRID_IMP_NETLOGIC_XLS616B: |
|
case PRID_IMP_NETLOGIC_XLS608B: |
|
case PRID_IMP_NETLOGIC_XLS416B: |
|
case PRID_IMP_NETLOGIC_XLS412B: |
|
case PRID_IMP_NETLOGIC_XLS408B: |
|
case PRID_IMP_NETLOGIC_XLS404B: |
|
c->cputype = CPU_XLR; |
|
__cpu_name[cpu] = "Netlogic XLS"; |
|
break; |
|
|
|
default: |
|
pr_info("Unknown Netlogic chip id [%02x]!\n", |
|
c->processor_id); |
|
c->cputype = CPU_XLR; |
|
break; |
|
} |
|
|
|
if (c->cputype == CPU_XLP) { |
|
set_isa(c, MIPS_CPU_ISA_M64R2); |
|
c->options |= (MIPS_CPU_FPU | MIPS_CPU_ULRI | MIPS_CPU_MCHECK); |
|
/* This will be updated again after all threads are woken up */ |
|
c->tlbsize = ((read_c0_config6() >> 16) & 0xffff) + 1; |
|
} else { |
|
set_isa(c, MIPS_CPU_ISA_M64R1); |
|
c->tlbsize = ((read_c0_config1() >> 25) & 0x3f) + 1; |
|
} |
|
c->kscratch_mask = 0xf; |
|
} |
|
|
|
#ifdef CONFIG_64BIT |
|
/* For use by uaccess.h */ |
|
u64 __ua_limit; |
|
EXPORT_SYMBOL(__ua_limit); |
|
#endif |
|
|
|
const char *__cpu_name[NR_CPUS]; |
|
const char *__elf_platform; |
|
const char *__elf_base_platform; |
|
|
|
void cpu_probe(void) |
|
{ |
|
struct cpuinfo_mips *c = ¤t_cpu_data; |
|
unsigned int cpu = smp_processor_id(); |
|
|
|
/* |
|
* Set a default elf platform, cpu probe may later |
|
* overwrite it with a more precise value |
|
*/ |
|
set_elf_platform(cpu, "mips"); |
|
|
|
c->processor_id = PRID_IMP_UNKNOWN; |
|
c->fpu_id = FPIR_IMP_NONE; |
|
c->cputype = CPU_UNKNOWN; |
|
c->writecombine = _CACHE_UNCACHED; |
|
|
|
c->fpu_csr31 = FPU_CSR_RN; |
|
c->fpu_msk31 = FPU_CSR_RSVD | FPU_CSR_ABS2008 | FPU_CSR_NAN2008; |
|
|
|
c->processor_id = read_c0_prid(); |
|
switch (c->processor_id & PRID_COMP_MASK) { |
|
case PRID_COMP_LEGACY: |
|
cpu_probe_legacy(c, cpu); |
|
break; |
|
case PRID_COMP_MIPS: |
|
cpu_probe_mips(c, cpu); |
|
break; |
|
case PRID_COMP_ALCHEMY: |
|
cpu_probe_alchemy(c, cpu); |
|
break; |
|
case PRID_COMP_SIBYTE: |
|
cpu_probe_sibyte(c, cpu); |
|
break; |
|
case PRID_COMP_BROADCOM: |
|
cpu_probe_broadcom(c, cpu); |
|
break; |
|
case PRID_COMP_SANDCRAFT: |
|
cpu_probe_sandcraft(c, cpu); |
|
break; |
|
case PRID_COMP_NXP: |
|
cpu_probe_nxp(c, cpu); |
|
break; |
|
case PRID_COMP_CAVIUM: |
|
cpu_probe_cavium(c, cpu); |
|
break; |
|
case PRID_COMP_LOONGSON: |
|
cpu_probe_loongson(c, cpu); |
|
break; |
|
case PRID_COMP_INGENIC_13: |
|
case PRID_COMP_INGENIC_D0: |
|
case PRID_COMP_INGENIC_D1: |
|
case PRID_COMP_INGENIC_E1: |
|
cpu_probe_ingenic(c, cpu); |
|
break; |
|
case PRID_COMP_NETLOGIC: |
|
cpu_probe_netlogic(c, cpu); |
|
break; |
|
} |
|
|
|
BUG_ON(!__cpu_name[cpu]); |
|
BUG_ON(c->cputype == CPU_UNKNOWN); |
|
|
|
/* |
|
* Platform code can force the cpu type to optimize code |
|
* generation. In that case be sure the cpu type is correctly |
|
* manually setup otherwise it could trigger some nasty bugs. |
|
*/ |
|
BUG_ON(current_cpu_type() != c->cputype); |
|
|
|
if (cpu_has_rixi) { |
|
/* Enable the RIXI exceptions */ |
|
set_c0_pagegrain(PG_IEC); |
|
back_to_back_c0_hazard(); |
|
/* Verify the IEC bit is set */ |
|
if (read_c0_pagegrain() & PG_IEC) |
|
c->options |= MIPS_CPU_RIXIEX; |
|
} |
|
|
|
if (mips_fpu_disabled) |
|
c->options &= ~MIPS_CPU_FPU; |
|
|
|
if (mips_dsp_disabled) |
|
c->ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P); |
|
|
|
if (mips_htw_disabled) { |
|
c->options &= ~MIPS_CPU_HTW; |
|
write_c0_pwctl(read_c0_pwctl() & |
|
~(1 << MIPS_PWCTL_PWEN_SHIFT)); |
|
} |
|
|
|
if (c->options & MIPS_CPU_FPU) |
|
cpu_set_fpu_opts(c); |
|
else |
|
cpu_set_nofpu_opts(c); |
|
|
|
if (cpu_has_mips_r2_r6) { |
|
c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1; |
|
/* R2 has Performance Counter Interrupt indicator */ |
|
c->options |= MIPS_CPU_PCI; |
|
} |
|
else |
|
c->srsets = 1; |
|
|
|
if (cpu_has_mips_r6) |
|
elf_hwcap |= HWCAP_MIPS_R6; |
|
|
|
if (cpu_has_msa) { |
|
c->msa_id = cpu_get_msa_id(); |
|
WARN(c->msa_id & MSA_IR_WRPF, |
|
"Vector register partitioning unimplemented!"); |
|
elf_hwcap |= HWCAP_MIPS_MSA; |
|
} |
|
|
|
if (cpu_has_mips16) |
|
elf_hwcap |= HWCAP_MIPS_MIPS16; |
|
|
|
if (cpu_has_mdmx) |
|
elf_hwcap |= HWCAP_MIPS_MDMX; |
|
|
|
if (cpu_has_mips3d) |
|
elf_hwcap |= HWCAP_MIPS_MIPS3D; |
|
|
|
if (cpu_has_smartmips) |
|
elf_hwcap |= HWCAP_MIPS_SMARTMIPS; |
|
|
|
if (cpu_has_dsp) |
|
elf_hwcap |= HWCAP_MIPS_DSP; |
|
|
|
if (cpu_has_dsp2) |
|
elf_hwcap |= HWCAP_MIPS_DSP2; |
|
|
|
if (cpu_has_dsp3) |
|
elf_hwcap |= HWCAP_MIPS_DSP3; |
|
|
|
if (cpu_has_mips16e2) |
|
elf_hwcap |= HWCAP_MIPS_MIPS16E2; |
|
|
|
if (cpu_has_loongson_mmi) |
|
elf_hwcap |= HWCAP_LOONGSON_MMI; |
|
|
|
if (cpu_has_loongson_ext) |
|
elf_hwcap |= HWCAP_LOONGSON_EXT; |
|
|
|
if (cpu_has_loongson_ext2) |
|
elf_hwcap |= HWCAP_LOONGSON_EXT2; |
|
|
|
if (cpu_has_vz) |
|
cpu_probe_vz(c); |
|
|
|
cpu_probe_vmbits(c); |
|
|
|
/* Synthesize CPUCFG data if running on Loongson processors; |
|
* no-op otherwise. |
|
* |
|
* This looks at previously probed features, so keep this at bottom. |
|
*/ |
|
loongson3_cpucfg_synthesize_data(c); |
|
|
|
#ifdef CONFIG_64BIT |
|
if (cpu == 0) |
|
__ua_limit = ~((1ull << cpu_vmbits) - 1); |
|
#endif |
|
|
|
reserve_exception_space(0, 0x1000); |
|
} |
|
|
|
void cpu_report(void) |
|
{ |
|
struct cpuinfo_mips *c = ¤t_cpu_data; |
|
|
|
pr_info("CPU%d revision is: %08x (%s)\n", |
|
smp_processor_id(), c->processor_id, cpu_name_string()); |
|
if (c->options & MIPS_CPU_FPU) |
|
printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id); |
|
if (cpu_has_msa) |
|
pr_info("MSA revision is: %08x\n", c->msa_id); |
|
} |
|
|
|
void cpu_set_cluster(struct cpuinfo_mips *cpuinfo, unsigned int cluster) |
|
{ |
|
/* Ensure the core number fits in the field */ |
|
WARN_ON(cluster > (MIPS_GLOBALNUMBER_CLUSTER >> |
|
MIPS_GLOBALNUMBER_CLUSTER_SHF)); |
|
|
|
cpuinfo->globalnumber &= ~MIPS_GLOBALNUMBER_CLUSTER; |
|
cpuinfo->globalnumber |= cluster << MIPS_GLOBALNUMBER_CLUSTER_SHF; |
|
} |
|
|
|
void cpu_set_core(struct cpuinfo_mips *cpuinfo, unsigned int core) |
|
{ |
|
/* Ensure the core number fits in the field */ |
|
WARN_ON(core > (MIPS_GLOBALNUMBER_CORE >> MIPS_GLOBALNUMBER_CORE_SHF)); |
|
|
|
cpuinfo->globalnumber &= ~MIPS_GLOBALNUMBER_CORE; |
|
cpuinfo->globalnumber |= core << MIPS_GLOBALNUMBER_CORE_SHF; |
|
} |
|
|
|
void cpu_set_vpe_id(struct cpuinfo_mips *cpuinfo, unsigned int vpe) |
|
{ |
|
/* Ensure the VP(E) ID fits in the field */ |
|
WARN_ON(vpe > (MIPS_GLOBALNUMBER_VP >> MIPS_GLOBALNUMBER_VP_SHF)); |
|
|
|
/* Ensure we're not using VP(E)s without support */ |
|
WARN_ON(vpe && !IS_ENABLED(CONFIG_MIPS_MT_SMP) && |
|
!IS_ENABLED(CONFIG_CPU_MIPSR6)); |
|
|
|
cpuinfo->globalnumber &= ~MIPS_GLOBALNUMBER_VP; |
|
cpuinfo->globalnumber |= vpe << MIPS_GLOBALNUMBER_VP_SHF; |
|
}
|
|
|