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951 lines
25 KiB
951 lines
25 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Procedures for creating, accessing and interpreting the device tree. |
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* |
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* Paul Mackerras August 1996. |
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* Copyright (C) 1996-2005 Paul Mackerras. |
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* |
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* Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. |
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* {engebret|bergner}@us.ibm.com |
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*/ |
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|
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#undef DEBUG |
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|
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#include <stdarg.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/init.h> |
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#include <linux/threads.h> |
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#include <linux/spinlock.h> |
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#include <linux/types.h> |
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#include <linux/pci.h> |
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#include <linux/delay.h> |
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#include <linux/initrd.h> |
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#include <linux/bitops.h> |
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#include <linux/export.h> |
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#include <linux/kexec.h> |
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#include <linux/irq.h> |
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#include <linux/memblock.h> |
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#include <linux/of.h> |
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#include <linux/of_fdt.h> |
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#include <linux/libfdt.h> |
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#include <linux/cpu.h> |
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#include <linux/pgtable.h> |
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|
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#include <asm/prom.h> |
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#include <asm/rtas.h> |
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#include <asm/page.h> |
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#include <asm/processor.h> |
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#include <asm/irq.h> |
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#include <asm/io.h> |
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#include <asm/kdump.h> |
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#include <asm/smp.h> |
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#include <asm/mmu.h> |
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#include <asm/paca.h> |
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#include <asm/powernv.h> |
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#include <asm/iommu.h> |
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#include <asm/btext.h> |
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#include <asm/sections.h> |
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#include <asm/machdep.h> |
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#include <asm/pci-bridge.h> |
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#include <asm/kexec.h> |
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#include <asm/opal.h> |
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#include <asm/fadump.h> |
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#include <asm/epapr_hcalls.h> |
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#include <asm/firmware.h> |
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#include <asm/dt_cpu_ftrs.h> |
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#include <asm/drmem.h> |
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#include <asm/ultravisor.h> |
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#include <mm/mmu_decl.h> |
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|
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#ifdef DEBUG |
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#define DBG(fmt...) printk(KERN_ERR fmt) |
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#else |
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#define DBG(fmt...) |
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#endif |
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int *chip_id_lookup_table; |
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#ifdef CONFIG_PPC64 |
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int __initdata iommu_is_off; |
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int __initdata iommu_force_on; |
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unsigned long tce_alloc_start, tce_alloc_end; |
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u64 ppc64_rma_size; |
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#endif |
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static phys_addr_t first_memblock_size; |
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static int __initdata boot_cpu_count; |
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static int __init early_parse_mem(char *p) |
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{ |
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if (!p) |
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return 1; |
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memory_limit = PAGE_ALIGN(memparse(p, &p)); |
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DBG("memory limit = 0x%llx\n", memory_limit); |
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return 0; |
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} |
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early_param("mem", early_parse_mem); |
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|
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/* |
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* overlaps_initrd - check for overlap with page aligned extension of |
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* initrd. |
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*/ |
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static inline int overlaps_initrd(unsigned long start, unsigned long size) |
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{ |
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#ifdef CONFIG_BLK_DEV_INITRD |
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if (!initrd_start) |
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return 0; |
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return (start + size) > ALIGN_DOWN(initrd_start, PAGE_SIZE) && |
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start <= ALIGN(initrd_end, PAGE_SIZE); |
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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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/** |
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* move_device_tree - move tree to an unused area, if needed. |
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* |
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* The device tree may be allocated beyond our memory limit, or inside the |
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* crash kernel region for kdump, or within the page aligned range of initrd. |
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* If so, move it out of the way. |
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*/ |
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static void __init move_device_tree(void) |
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{ |
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unsigned long start, size; |
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void *p; |
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DBG("-> move_device_tree\n"); |
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start = __pa(initial_boot_params); |
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size = fdt_totalsize(initial_boot_params); |
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if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) || |
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!memblock_is_memory(start + size - 1) || |
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overlaps_crashkernel(start, size) || overlaps_initrd(start, size)) { |
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p = memblock_alloc_raw(size, PAGE_SIZE); |
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if (!p) |
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panic("Failed to allocate %lu bytes to move device tree\n", |
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size); |
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memcpy(p, initial_boot_params, size); |
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initial_boot_params = p; |
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DBG("Moved device tree to 0x%px\n", p); |
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} |
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DBG("<- move_device_tree\n"); |
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} |
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/* |
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* ibm,pa-features is a per-cpu property that contains a string of |
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* attribute descriptors, each of which has a 2 byte header plus up |
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* to 254 bytes worth of processor attribute bits. First header |
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* byte specifies the number of bytes following the header. |
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* Second header byte is an "attribute-specifier" type, of which |
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* zero is the only currently-defined value. |
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* Implementation: Pass in the byte and bit offset for the feature |
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* that we are interested in. The function will return -1 if the |
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* pa-features property is missing, or a 1/0 to indicate if the feature |
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* is supported/not supported. Note that the bit numbers are |
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* big-endian to match the definition in PAPR. |
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*/ |
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static struct ibm_pa_feature { |
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unsigned long cpu_features; /* CPU_FTR_xxx bit */ |
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unsigned long mmu_features; /* MMU_FTR_xxx bit */ |
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unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */ |
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unsigned int cpu_user_ftrs2; /* PPC_FEATURE2_xxx bit */ |
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unsigned char pabyte; /* byte number in ibm,pa-features */ |
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unsigned char pabit; /* bit number (big-endian) */ |
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unsigned char invert; /* if 1, pa bit set => clear feature */ |
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} ibm_pa_features[] __initdata = { |
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{ .pabyte = 0, .pabit = 0, .cpu_user_ftrs = PPC_FEATURE_HAS_MMU }, |
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{ .pabyte = 0, .pabit = 1, .cpu_user_ftrs = PPC_FEATURE_HAS_FPU }, |
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{ .pabyte = 0, .pabit = 3, .cpu_features = CPU_FTR_CTRL }, |
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{ .pabyte = 0, .pabit = 6, .cpu_features = CPU_FTR_NOEXECUTE }, |
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{ .pabyte = 1, .pabit = 2, .mmu_features = MMU_FTR_CI_LARGE_PAGE }, |
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#ifdef CONFIG_PPC_RADIX_MMU |
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{ .pabyte = 40, .pabit = 0, .mmu_features = MMU_FTR_TYPE_RADIX | MMU_FTR_GTSE }, |
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#endif |
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{ .pabyte = 5, .pabit = 0, .cpu_features = CPU_FTR_REAL_LE, |
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.cpu_user_ftrs = PPC_FEATURE_TRUE_LE }, |
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/* |
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* If the kernel doesn't support TM (ie CONFIG_PPC_TRANSACTIONAL_MEM=n), |
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* we don't want to turn on TM here, so we use the *_COMP versions |
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* which are 0 if the kernel doesn't support TM. |
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*/ |
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{ .pabyte = 22, .pabit = 0, .cpu_features = CPU_FTR_TM_COMP, |
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.cpu_user_ftrs2 = PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_HTM_NOSC_COMP }, |
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{ .pabyte = 64, .pabit = 0, .cpu_features = CPU_FTR_DAWR1 }, |
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}; |
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static void __init scan_features(unsigned long node, const unsigned char *ftrs, |
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unsigned long tablelen, |
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struct ibm_pa_feature *fp, |
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unsigned long ft_size) |
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{ |
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unsigned long i, len, bit; |
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/* find descriptor with type == 0 */ |
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for (;;) { |
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if (tablelen < 3) |
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return; |
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len = 2 + ftrs[0]; |
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if (tablelen < len) |
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return; /* descriptor 0 not found */ |
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if (ftrs[1] == 0) |
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break; |
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tablelen -= len; |
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ftrs += len; |
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} |
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/* loop over bits we know about */ |
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for (i = 0; i < ft_size; ++i, ++fp) { |
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if (fp->pabyte >= ftrs[0]) |
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continue; |
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bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; |
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if (bit ^ fp->invert) { |
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cur_cpu_spec->cpu_features |= fp->cpu_features; |
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cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; |
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cur_cpu_spec->cpu_user_features2 |= fp->cpu_user_ftrs2; |
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cur_cpu_spec->mmu_features |= fp->mmu_features; |
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} else { |
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cur_cpu_spec->cpu_features &= ~fp->cpu_features; |
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cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs; |
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cur_cpu_spec->cpu_user_features2 &= ~fp->cpu_user_ftrs2; |
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cur_cpu_spec->mmu_features &= ~fp->mmu_features; |
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} |
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} |
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} |
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static void __init check_cpu_pa_features(unsigned long node) |
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{ |
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const unsigned char *pa_ftrs; |
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int tablelen; |
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pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); |
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if (pa_ftrs == NULL) |
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return; |
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scan_features(node, pa_ftrs, tablelen, |
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ibm_pa_features, ARRAY_SIZE(ibm_pa_features)); |
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} |
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#ifdef CONFIG_PPC_BOOK3S_64 |
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static void __init init_mmu_slb_size(unsigned long node) |
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{ |
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const __be32 *slb_size_ptr; |
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slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? : |
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of_get_flat_dt_prop(node, "ibm,slb-size", NULL); |
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if (slb_size_ptr) |
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mmu_slb_size = be32_to_cpup(slb_size_ptr); |
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} |
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#else |
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#define init_mmu_slb_size(node) do { } while(0) |
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#endif |
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static struct feature_property { |
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const char *name; |
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u32 min_value; |
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unsigned long cpu_feature; |
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unsigned long cpu_user_ftr; |
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} feature_properties[] __initdata = { |
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#ifdef CONFIG_ALTIVEC |
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{"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, |
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{"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, |
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#endif /* CONFIG_ALTIVEC */ |
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#ifdef CONFIG_VSX |
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/* Yes, this _really_ is ibm,vmx == 2 to enable VSX */ |
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{"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX}, |
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#endif /* CONFIG_VSX */ |
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#ifdef CONFIG_PPC64 |
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{"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP}, |
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{"ibm,purr", 1, CPU_FTR_PURR, 0}, |
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{"ibm,spurr", 1, CPU_FTR_SPURR, 0}, |
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#endif /* CONFIG_PPC64 */ |
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}; |
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#if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU) |
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static __init void identical_pvr_fixup(unsigned long node) |
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{ |
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unsigned int pvr; |
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const char *model = of_get_flat_dt_prop(node, "model", NULL); |
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/* |
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* Since 440GR(x)/440EP(x) processors have the same pvr, |
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* we check the node path and set bit 28 in the cur_cpu_spec |
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* pvr for EP(x) processor version. This bit is always 0 in |
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* the "real" pvr. Then we call identify_cpu again with |
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* the new logical pvr to enable FPU support. |
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*/ |
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if (model && strstr(model, "440EP")) { |
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pvr = cur_cpu_spec->pvr_value | 0x8; |
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identify_cpu(0, pvr); |
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DBG("Using logical pvr %x for %s\n", pvr, model); |
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} |
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} |
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#else |
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#define identical_pvr_fixup(node) do { } while(0) |
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#endif |
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static void __init check_cpu_feature_properties(unsigned long node) |
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{ |
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int i; |
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struct feature_property *fp = feature_properties; |
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const __be32 *prop; |
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for (i = 0; i < (int)ARRAY_SIZE(feature_properties); ++i, ++fp) { |
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prop = of_get_flat_dt_prop(node, fp->name, NULL); |
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if (prop && be32_to_cpup(prop) >= fp->min_value) { |
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cur_cpu_spec->cpu_features |= fp->cpu_feature; |
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cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr; |
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} |
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} |
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} |
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static int __init early_init_dt_scan_cpus(unsigned long node, |
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const char *uname, int depth, |
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void *data) |
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{ |
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const char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
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const __be32 *prop; |
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const __be32 *intserv; |
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int i, nthreads; |
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int len; |
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int found = -1; |
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int found_thread = 0; |
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/* We are scanning "cpu" nodes only */ |
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if (type == NULL || strcmp(type, "cpu") != 0) |
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return 0; |
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/* Get physical cpuid */ |
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intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len); |
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if (!intserv) |
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intserv = of_get_flat_dt_prop(node, "reg", &len); |
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nthreads = len / sizeof(int); |
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/* |
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* Now see if any of these threads match our boot cpu. |
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* NOTE: This must match the parsing done in smp_setup_cpu_maps. |
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*/ |
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for (i = 0; i < nthreads; i++) { |
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if (be32_to_cpu(intserv[i]) == |
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fdt_boot_cpuid_phys(initial_boot_params)) { |
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found = boot_cpu_count; |
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found_thread = i; |
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} |
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#ifdef CONFIG_SMP |
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/* logical cpu id is always 0 on UP kernels */ |
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boot_cpu_count++; |
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#endif |
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} |
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/* Not the boot CPU */ |
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if (found < 0) |
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return 0; |
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DBG("boot cpu: logical %d physical %d\n", found, |
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be32_to_cpu(intserv[found_thread])); |
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boot_cpuid = found; |
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/* |
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* PAPR defines "logical" PVR values for cpus that |
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* meet various levels of the architecture: |
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* 0x0f000001 Architecture version 2.04 |
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* 0x0f000002 Architecture version 2.05 |
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* If the cpu-version property in the cpu node contains |
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* such a value, we call identify_cpu again with the |
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* logical PVR value in order to use the cpu feature |
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* bits appropriate for the architecture level. |
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* |
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* A POWER6 partition in "POWER6 architected" mode |
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* uses the 0x0f000002 PVR value; in POWER5+ mode |
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* it uses 0x0f000001. |
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* |
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* If we're using device tree CPU feature discovery then we don't |
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* support the cpu-version property, and it's the responsibility of the |
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* firmware/hypervisor to provide the correct feature set for the |
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* architecture level via the ibm,powerpc-cpu-features binding. |
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*/ |
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if (!dt_cpu_ftrs_in_use()) { |
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prop = of_get_flat_dt_prop(node, "cpu-version", NULL); |
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if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000) |
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identify_cpu(0, be32_to_cpup(prop)); |
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check_cpu_feature_properties(node); |
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check_cpu_pa_features(node); |
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} |
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identical_pvr_fixup(node); |
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init_mmu_slb_size(node); |
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#ifdef CONFIG_PPC64 |
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if (nthreads == 1) |
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cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; |
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else if (!dt_cpu_ftrs_in_use()) |
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cur_cpu_spec->cpu_features |= CPU_FTR_SMT; |
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allocate_paca(boot_cpuid); |
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#endif |
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set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread])); |
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return 0; |
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} |
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static int __init early_init_dt_scan_chosen_ppc(unsigned long node, |
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const char *uname, |
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int depth, void *data) |
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{ |
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const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */ |
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/* Use common scan routine to determine if this is the chosen node */ |
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if (early_init_dt_scan_chosen(node, uname, depth, data) == 0) |
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return 0; |
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#ifdef CONFIG_PPC64 |
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/* check if iommu is forced on or off */ |
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if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) |
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iommu_is_off = 1; |
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if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) |
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iommu_force_on = 1; |
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#endif |
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/* mem=x on the command line is the preferred mechanism */ |
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lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); |
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if (lprop) |
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memory_limit = *lprop; |
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#ifdef CONFIG_PPC64 |
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lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); |
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if (lprop) |
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tce_alloc_start = *lprop; |
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lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); |
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if (lprop) |
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tce_alloc_end = *lprop; |
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#endif |
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#ifdef CONFIG_KEXEC_CORE |
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lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); |
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if (lprop) |
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crashk_res.start = *lprop; |
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lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); |
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if (lprop) |
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crashk_res.end = crashk_res.start + *lprop - 1; |
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#endif |
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/* break now */ |
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return 1; |
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} |
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/* |
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* Compare the range against max mem limit and update |
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* size if it cross the limit. |
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*/ |
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#ifdef CONFIG_SPARSEMEM |
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static bool validate_mem_limit(u64 base, u64 *size) |
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{ |
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u64 max_mem = 1UL << (MAX_PHYSMEM_BITS); |
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|
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if (base >= max_mem) |
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return false; |
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if ((base + *size) > max_mem) |
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*size = max_mem - base; |
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return true; |
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} |
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#else |
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static bool validate_mem_limit(u64 base, u64 *size) |
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{ |
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return true; |
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} |
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#endif |
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|
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#ifdef CONFIG_PPC_PSERIES |
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/* |
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* Interpret the ibm dynamic reconfiguration memory LMBs. |
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* This contains a list of memory blocks along with NUMA affinity |
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* information. |
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*/ |
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static int __init early_init_drmem_lmb(struct drmem_lmb *lmb, |
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const __be32 **usm, |
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void *data) |
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{ |
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u64 base, size; |
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int is_kexec_kdump = 0, rngs; |
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|
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base = lmb->base_addr; |
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size = drmem_lmb_size(); |
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rngs = 1; |
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|
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/* |
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* Skip this block if the reserved bit is set in flags |
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* or if the block is not assigned to this partition. |
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*/ |
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if ((lmb->flags & DRCONF_MEM_RESERVED) || |
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!(lmb->flags & DRCONF_MEM_ASSIGNED)) |
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return 0; |
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|
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if (*usm) |
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is_kexec_kdump = 1; |
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|
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if (is_kexec_kdump) { |
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/* |
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* For each memblock in ibm,dynamic-memory, a |
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* corresponding entry in linux,drconf-usable-memory |
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* property contains a counter 'p' followed by 'p' |
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* (base, size) duple. Now read the counter from |
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* linux,drconf-usable-memory property |
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*/ |
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rngs = dt_mem_next_cell(dt_root_size_cells, usm); |
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if (!rngs) /* there are no (base, size) duple */ |
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return 0; |
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} |
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do { |
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if (is_kexec_kdump) { |
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base = dt_mem_next_cell(dt_root_addr_cells, usm); |
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size = dt_mem_next_cell(dt_root_size_cells, usm); |
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} |
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|
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if (iommu_is_off) { |
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if (base >= 0x80000000ul) |
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continue; |
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if ((base + size) > 0x80000000ul) |
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size = 0x80000000ul - base; |
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} |
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|
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if (!validate_mem_limit(base, &size)) |
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continue; |
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|
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DBG("Adding: %llx -> %llx\n", base, size); |
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memblock_add(base, size); |
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|
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if (lmb->flags & DRCONF_MEM_HOTREMOVABLE) |
|
memblock_mark_hotplug(base, size); |
|
} while (--rngs); |
|
|
|
return 0; |
|
} |
|
#endif /* CONFIG_PPC_PSERIES */ |
|
|
|
static int __init early_init_dt_scan_memory_ppc(unsigned long node, |
|
const char *uname, |
|
int depth, void *data) |
|
{ |
|
#ifdef CONFIG_PPC_PSERIES |
|
if (depth == 1 && |
|
strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) { |
|
walk_drmem_lmbs_early(node, NULL, early_init_drmem_lmb); |
|
return 0; |
|
} |
|
#endif |
|
|
|
return early_init_dt_scan_memory(node, uname, depth, data); |
|
} |
|
|
|
/* |
|
* For a relocatable kernel, we need to get the memstart_addr first, |
|
* then use it to calculate the virtual kernel start address. This has |
|
* to happen at a very early stage (before machine_init). In this case, |
|
* we just want to get the memstart_address and would not like to mess the |
|
* memblock at this stage. So introduce a variable to skip the memblock_add() |
|
* for this reason. |
|
*/ |
|
#ifdef CONFIG_RELOCATABLE |
|
static int add_mem_to_memblock = 1; |
|
#else |
|
#define add_mem_to_memblock 1 |
|
#endif |
|
|
|
void __init early_init_dt_add_memory_arch(u64 base, u64 size) |
|
{ |
|
#ifdef CONFIG_PPC64 |
|
if (iommu_is_off) { |
|
if (base >= 0x80000000ul) |
|
return; |
|
if ((base + size) > 0x80000000ul) |
|
size = 0x80000000ul - base; |
|
} |
|
#endif |
|
/* Keep track of the beginning of memory -and- the size of |
|
* the very first block in the device-tree as it represents |
|
* the RMA on ppc64 server |
|
*/ |
|
if (base < memstart_addr) { |
|
memstart_addr = base; |
|
first_memblock_size = size; |
|
} |
|
|
|
/* Add the chunk to the MEMBLOCK list */ |
|
if (add_mem_to_memblock) { |
|
if (validate_mem_limit(base, &size)) |
|
memblock_add(base, size); |
|
} |
|
} |
|
|
|
static void __init early_reserve_mem_dt(void) |
|
{ |
|
unsigned long i, dt_root; |
|
int len; |
|
const __be32 *prop; |
|
|
|
early_init_fdt_reserve_self(); |
|
early_init_fdt_scan_reserved_mem(); |
|
|
|
dt_root = of_get_flat_dt_root(); |
|
|
|
prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len); |
|
|
|
if (!prop) |
|
return; |
|
|
|
DBG("Found new-style reserved-ranges\n"); |
|
|
|
/* Each reserved range is an (address,size) pair, 2 cells each, |
|
* totalling 4 cells per range. */ |
|
for (i = 0; i < len / (sizeof(*prop) * 4); i++) { |
|
u64 base, size; |
|
|
|
base = of_read_number(prop + (i * 4) + 0, 2); |
|
size = of_read_number(prop + (i * 4) + 2, 2); |
|
|
|
if (size) { |
|
DBG("reserving: %llx -> %llx\n", base, size); |
|
memblock_reserve(base, size); |
|
} |
|
} |
|
} |
|
|
|
static void __init early_reserve_mem(void) |
|
{ |
|
__be64 *reserve_map; |
|
|
|
reserve_map = (__be64 *)(((unsigned long)initial_boot_params) + |
|
fdt_off_mem_rsvmap(initial_boot_params)); |
|
|
|
/* Look for the new "reserved-regions" property in the DT */ |
|
early_reserve_mem_dt(); |
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD |
|
/* Then reserve the initrd, if any */ |
|
if (initrd_start && (initrd_end > initrd_start)) { |
|
memblock_reserve(ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE), |
|
ALIGN(initrd_end, PAGE_SIZE) - |
|
ALIGN_DOWN(initrd_start, PAGE_SIZE)); |
|
} |
|
#endif /* CONFIG_BLK_DEV_INITRD */ |
|
|
|
#ifdef CONFIG_PPC32 |
|
/* |
|
* Handle the case where we might be booting from an old kexec |
|
* image that setup the mem_rsvmap as pairs of 32-bit values |
|
*/ |
|
if (be64_to_cpup(reserve_map) > 0xffffffffull) { |
|
u32 base_32, size_32; |
|
__be32 *reserve_map_32 = (__be32 *)reserve_map; |
|
|
|
DBG("Found old 32-bit reserve map\n"); |
|
|
|
while (1) { |
|
base_32 = be32_to_cpup(reserve_map_32++); |
|
size_32 = be32_to_cpup(reserve_map_32++); |
|
if (size_32 == 0) |
|
break; |
|
DBG("reserving: %x -> %x\n", base_32, size_32); |
|
memblock_reserve(base_32, size_32); |
|
} |
|
return; |
|
} |
|
#endif |
|
} |
|
|
|
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
|
static bool tm_disabled __initdata; |
|
|
|
static int __init parse_ppc_tm(char *str) |
|
{ |
|
bool res; |
|
|
|
if (kstrtobool(str, &res)) |
|
return -EINVAL; |
|
|
|
tm_disabled = !res; |
|
|
|
return 0; |
|
} |
|
early_param("ppc_tm", parse_ppc_tm); |
|
|
|
static void __init tm_init(void) |
|
{ |
|
if (tm_disabled) { |
|
pr_info("Disabling hardware transactional memory (HTM)\n"); |
|
cur_cpu_spec->cpu_user_features2 &= |
|
~(PPC_FEATURE2_HTM_NOSC | PPC_FEATURE2_HTM); |
|
cur_cpu_spec->cpu_features &= ~CPU_FTR_TM; |
|
return; |
|
} |
|
|
|
pnv_tm_init(); |
|
} |
|
#else |
|
static void tm_init(void) { } |
|
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ |
|
|
|
#ifdef CONFIG_PPC64 |
|
static void __init save_fscr_to_task(void) |
|
{ |
|
/* |
|
* Ensure the init_task (pid 0, aka swapper) uses the value of FSCR we |
|
* have configured via the device tree features or via __init_FSCR(). |
|
* That value will then be propagated to pid 1 (init) and all future |
|
* processes. |
|
*/ |
|
if (early_cpu_has_feature(CPU_FTR_ARCH_207S)) |
|
init_task.thread.fscr = mfspr(SPRN_FSCR); |
|
} |
|
#else |
|
static inline void save_fscr_to_task(void) {} |
|
#endif |
|
|
|
|
|
void __init early_init_devtree(void *params) |
|
{ |
|
phys_addr_t limit; |
|
|
|
DBG(" -> early_init_devtree(%px)\n", params); |
|
|
|
/* Too early to BUG_ON(), do it by hand */ |
|
if (!early_init_dt_verify(params)) |
|
panic("BUG: Failed verifying flat device tree, bad version?"); |
|
|
|
#ifdef CONFIG_PPC_RTAS |
|
/* Some machines might need RTAS info for debugging, grab it now. */ |
|
of_scan_flat_dt(early_init_dt_scan_rtas, NULL); |
|
#endif |
|
|
|
#ifdef CONFIG_PPC_POWERNV |
|
/* Some machines might need OPAL info for debugging, grab it now. */ |
|
of_scan_flat_dt(early_init_dt_scan_opal, NULL); |
|
|
|
/* Scan tree for ultravisor feature */ |
|
of_scan_flat_dt(early_init_dt_scan_ultravisor, NULL); |
|
#endif |
|
|
|
#if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP) |
|
/* scan tree to see if dump is active during last boot */ |
|
of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL); |
|
#endif |
|
|
|
/* Retrieve various informations from the /chosen node of the |
|
* device-tree, including the platform type, initrd location and |
|
* size, TCE reserve, and more ... |
|
*/ |
|
of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line); |
|
|
|
/* Scan memory nodes and rebuild MEMBLOCKs */ |
|
of_scan_flat_dt(early_init_dt_scan_root, NULL); |
|
of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); |
|
|
|
parse_early_param(); |
|
|
|
/* make sure we've parsed cmdline for mem= before this */ |
|
if (memory_limit) |
|
first_memblock_size = min_t(u64, first_memblock_size, memory_limit); |
|
setup_initial_memory_limit(memstart_addr, first_memblock_size); |
|
/* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */ |
|
memblock_reserve(PHYSICAL_START, __pa(_end) - PHYSICAL_START); |
|
/* If relocatable, reserve first 32k for interrupt vectors etc. */ |
|
if (PHYSICAL_START > MEMORY_START) |
|
memblock_reserve(MEMORY_START, 0x8000); |
|
reserve_kdump_trampoline(); |
|
#if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP) |
|
/* |
|
* If we fail to reserve memory for firmware-assisted dump then |
|
* fallback to kexec based kdump. |
|
*/ |
|
if (fadump_reserve_mem() == 0) |
|
#endif |
|
reserve_crashkernel(); |
|
early_reserve_mem(); |
|
|
|
/* Ensure that total memory size is page-aligned. */ |
|
limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE); |
|
memblock_enforce_memory_limit(limit); |
|
|
|
#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_4K_PAGES) |
|
if (!early_radix_enabled()) |
|
memblock_cap_memory_range(0, 1UL << (H_MAX_PHYSMEM_BITS)); |
|
#endif |
|
|
|
memblock_allow_resize(); |
|
memblock_dump_all(); |
|
|
|
DBG("Phys. mem: %llx\n", (unsigned long long)memblock_phys_mem_size()); |
|
|
|
/* We may need to relocate the flat tree, do it now. |
|
* FIXME .. and the initrd too? */ |
|
move_device_tree(); |
|
|
|
allocate_paca_ptrs(); |
|
|
|
DBG("Scanning CPUs ...\n"); |
|
|
|
dt_cpu_ftrs_scan(); |
|
|
|
/* Retrieve CPU related informations from the flat tree |
|
* (altivec support, boot CPU ID, ...) |
|
*/ |
|
of_scan_flat_dt(early_init_dt_scan_cpus, NULL); |
|
if (boot_cpuid < 0) { |
|
printk("Failed to identify boot CPU !\n"); |
|
BUG(); |
|
} |
|
|
|
save_fscr_to_task(); |
|
|
|
#if defined(CONFIG_SMP) && defined(CONFIG_PPC64) |
|
/* We'll later wait for secondaries to check in; there are |
|
* NCPUS-1 non-boot CPUs :-) |
|
*/ |
|
spinning_secondaries = boot_cpu_count - 1; |
|
#endif |
|
|
|
mmu_early_init_devtree(); |
|
|
|
#ifdef CONFIG_PPC_POWERNV |
|
/* Scan and build the list of machine check recoverable ranges */ |
|
of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL); |
|
#endif |
|
epapr_paravirt_early_init(); |
|
|
|
/* Now try to figure out if we are running on LPAR and so on */ |
|
pseries_probe_fw_features(); |
|
|
|
/* |
|
* Initialize pkey features and default AMR/IAMR values |
|
*/ |
|
pkey_early_init_devtree(); |
|
|
|
#ifdef CONFIG_PPC_PS3 |
|
/* Identify PS3 firmware */ |
|
if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3")) |
|
powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE; |
|
#endif |
|
|
|
tm_init(); |
|
|
|
DBG(" <- early_init_devtree()\n"); |
|
} |
|
|
|
#ifdef CONFIG_RELOCATABLE |
|
/* |
|
* This function run before early_init_devtree, so we have to init |
|
* initial_boot_params. |
|
*/ |
|
void __init early_get_first_memblock_info(void *params, phys_addr_t *size) |
|
{ |
|
/* Setup flat device-tree pointer */ |
|
initial_boot_params = params; |
|
|
|
/* |
|
* Scan the memory nodes and set add_mem_to_memblock to 0 to avoid |
|
* mess the memblock. |
|
*/ |
|
add_mem_to_memblock = 0; |
|
of_scan_flat_dt(early_init_dt_scan_root, NULL); |
|
of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); |
|
add_mem_to_memblock = 1; |
|
|
|
if (size) |
|
*size = first_memblock_size; |
|
} |
|
#endif |
|
|
|
/******* |
|
* |
|
* New implementation of the OF "find" APIs, return a refcounted |
|
* object, call of_node_put() when done. The device tree and list |
|
* are protected by a rw_lock. |
|
* |
|
* Note that property management will need some locking as well, |
|
* this isn't dealt with yet. |
|
* |
|
*******/ |
|
|
|
/** |
|
* of_get_ibm_chip_id - Returns the IBM "chip-id" of a device |
|
* @np: device node of the device |
|
* |
|
* This looks for a property "ibm,chip-id" in the node or any |
|
* of its parents and returns its content, or -1 if it cannot |
|
* be found. |
|
*/ |
|
int of_get_ibm_chip_id(struct device_node *np) |
|
{ |
|
of_node_get(np); |
|
while (np) { |
|
u32 chip_id; |
|
|
|
/* |
|
* Skiboot may produce memory nodes that contain more than one |
|
* cell in chip-id, we only read the first one here. |
|
*/ |
|
if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) { |
|
of_node_put(np); |
|
return chip_id; |
|
} |
|
|
|
np = of_get_next_parent(np); |
|
} |
|
return -1; |
|
} |
|
EXPORT_SYMBOL(of_get_ibm_chip_id); |
|
|
|
/** |
|
* cpu_to_chip_id - Return the cpus chip-id |
|
* @cpu: The logical cpu number. |
|
* |
|
* Return the value of the ibm,chip-id property corresponding to the given |
|
* logical cpu number. If the chip-id can not be found, returns -1. |
|
*/ |
|
int cpu_to_chip_id(int cpu) |
|
{ |
|
struct device_node *np; |
|
int ret = -1, idx; |
|
|
|
idx = cpu / threads_per_core; |
|
if (chip_id_lookup_table && chip_id_lookup_table[idx] != -1) |
|
return chip_id_lookup_table[idx]; |
|
|
|
np = of_get_cpu_node(cpu, NULL); |
|
if (np) { |
|
ret = of_get_ibm_chip_id(np); |
|
of_node_put(np); |
|
|
|
if (chip_id_lookup_table) |
|
chip_id_lookup_table[idx] = ret; |
|
} |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(cpu_to_chip_id); |
|
|
|
bool arch_match_cpu_phys_id(int cpu, u64 phys_id) |
|
{ |
|
#ifdef CONFIG_SMP |
|
/* |
|
* Early firmware scanning must use this rather than |
|
* get_hard_smp_processor_id because we don't have pacas allocated |
|
* until memory topology is discovered. |
|
*/ |
|
if (cpu_to_phys_id != NULL) |
|
return (int)phys_id == cpu_to_phys_id[cpu]; |
|
#endif |
|
|
|
return (int)phys_id == get_hard_smp_processor_id(cpu); |
|
}
|
|
|