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958 lines
23 KiB
958 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Common boot and setup code for both 32-bit and 64-bit. |
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* Extracted from arch/powerpc/kernel/setup_64.c. |
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* |
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* Copyright (C) 2001 PPC64 Team, IBM Corp |
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*/ |
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|
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#undef DEBUG |
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|
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#include <linux/export.h> |
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#include <linux/panic_notifier.h> |
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#include <linux/string.h> |
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#include <linux/sched.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/reboot.h> |
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#include <linux/delay.h> |
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#include <linux/initrd.h> |
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#include <linux/platform_device.h> |
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#include <linux/seq_file.h> |
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#include <linux/ioport.h> |
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#include <linux/console.h> |
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#include <linux/screen_info.h> |
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#include <linux/root_dev.h> |
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#include <linux/notifier.h> |
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#include <linux/cpu.h> |
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#include <linux/unistd.h> |
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#include <linux/serial.h> |
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#include <linux/serial_8250.h> |
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#include <linux/percpu.h> |
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#include <linux/memblock.h> |
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#include <linux/of_platform.h> |
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#include <linux/hugetlb.h> |
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#include <linux/pgtable.h> |
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#include <asm/debugfs.h> |
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#include <asm/io.h> |
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#include <asm/paca.h> |
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#include <asm/prom.h> |
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#include <asm/processor.h> |
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#include <asm/vdso_datapage.h> |
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#include <asm/smp.h> |
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#include <asm/elf.h> |
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#include <asm/machdep.h> |
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#include <asm/time.h> |
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#include <asm/cputable.h> |
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#include <asm/sections.h> |
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#include <asm/firmware.h> |
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#include <asm/btext.h> |
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#include <asm/nvram.h> |
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#include <asm/setup.h> |
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#include <asm/rtas.h> |
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#include <asm/iommu.h> |
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#include <asm/serial.h> |
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#include <asm/cache.h> |
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#include <asm/page.h> |
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#include <asm/mmu.h> |
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#include <asm/xmon.h> |
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#include <asm/cputhreads.h> |
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#include <mm/mmu_decl.h> |
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#include <asm/fadump.h> |
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#include <asm/udbg.h> |
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#include <asm/hugetlb.h> |
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#include <asm/livepatch.h> |
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#include <asm/mmu_context.h> |
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#include <asm/cpu_has_feature.h> |
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#include <asm/kasan.h> |
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#include <asm/mce.h> |
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|
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#include "setup.h" |
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#ifdef DEBUG |
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#define DBG(fmt...) udbg_printf(fmt) |
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#else |
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#define DBG(fmt...) |
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#endif |
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/* The main machine-dep calls structure |
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*/ |
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struct machdep_calls ppc_md; |
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EXPORT_SYMBOL(ppc_md); |
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struct machdep_calls *machine_id; |
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EXPORT_SYMBOL(machine_id); |
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int boot_cpuid = -1; |
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EXPORT_SYMBOL_GPL(boot_cpuid); |
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/* |
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* These are used in binfmt_elf.c to put aux entries on the stack |
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* for each elf executable being started. |
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*/ |
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int dcache_bsize; |
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int icache_bsize; |
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/* |
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* This still seems to be needed... -- paulus |
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*/ |
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struct screen_info screen_info = { |
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.orig_x = 0, |
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.orig_y = 25, |
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.orig_video_cols = 80, |
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.orig_video_lines = 25, |
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.orig_video_isVGA = 1, |
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.orig_video_points = 16 |
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}; |
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#if defined(CONFIG_FB_VGA16_MODULE) |
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EXPORT_SYMBOL(screen_info); |
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#endif |
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/* Variables required to store legacy IO irq routing */ |
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int of_i8042_kbd_irq; |
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EXPORT_SYMBOL_GPL(of_i8042_kbd_irq); |
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int of_i8042_aux_irq; |
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EXPORT_SYMBOL_GPL(of_i8042_aux_irq); |
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#ifdef __DO_IRQ_CANON |
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/* XXX should go elsewhere eventually */ |
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int ppc_do_canonicalize_irqs; |
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EXPORT_SYMBOL(ppc_do_canonicalize_irqs); |
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#endif |
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#ifdef CONFIG_CRASH_CORE |
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/* This keeps a track of which one is the crashing cpu. */ |
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int crashing_cpu = -1; |
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#endif |
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|
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/* also used by kexec */ |
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void machine_shutdown(void) |
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{ |
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/* |
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* if fadump is active, cleanup the fadump registration before we |
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* shutdown. |
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*/ |
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fadump_cleanup(); |
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if (ppc_md.machine_shutdown) |
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ppc_md.machine_shutdown(); |
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} |
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static void machine_hang(void) |
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{ |
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pr_emerg("System Halted, OK to turn off power\n"); |
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local_irq_disable(); |
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while (1) |
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; |
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} |
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void machine_restart(char *cmd) |
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{ |
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machine_shutdown(); |
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if (ppc_md.restart) |
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ppc_md.restart(cmd); |
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smp_send_stop(); |
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do_kernel_restart(cmd); |
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mdelay(1000); |
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machine_hang(); |
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} |
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void machine_power_off(void) |
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{ |
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machine_shutdown(); |
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if (pm_power_off) |
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pm_power_off(); |
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smp_send_stop(); |
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machine_hang(); |
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} |
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/* Used by the G5 thermal driver */ |
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EXPORT_SYMBOL_GPL(machine_power_off); |
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void (*pm_power_off)(void); |
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EXPORT_SYMBOL_GPL(pm_power_off); |
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void machine_halt(void) |
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{ |
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machine_shutdown(); |
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if (ppc_md.halt) |
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ppc_md.halt(); |
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smp_send_stop(); |
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machine_hang(); |
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} |
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#ifdef CONFIG_SMP |
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DEFINE_PER_CPU(unsigned int, cpu_pvr); |
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#endif |
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static void show_cpuinfo_summary(struct seq_file *m) |
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{ |
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struct device_node *root; |
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const char *model = NULL; |
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unsigned long bogosum = 0; |
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int i; |
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if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) { |
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for_each_online_cpu(i) |
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bogosum += loops_per_jiffy; |
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seq_printf(m, "total bogomips\t: %lu.%02lu\n", |
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bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100); |
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} |
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seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); |
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if (ppc_md.name) |
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seq_printf(m, "platform\t: %s\n", ppc_md.name); |
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root = of_find_node_by_path("/"); |
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if (root) |
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model = of_get_property(root, "model", NULL); |
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if (model) |
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seq_printf(m, "model\t\t: %s\n", model); |
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of_node_put(root); |
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if (ppc_md.show_cpuinfo != NULL) |
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ppc_md.show_cpuinfo(m); |
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/* Display the amount of memory */ |
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if (IS_ENABLED(CONFIG_PPC32)) |
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seq_printf(m, "Memory\t\t: %d MB\n", |
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(unsigned int)(total_memory / (1024 * 1024))); |
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} |
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static int show_cpuinfo(struct seq_file *m, void *v) |
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{ |
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unsigned long cpu_id = (unsigned long)v - 1; |
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unsigned int pvr; |
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unsigned long proc_freq; |
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unsigned short maj; |
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unsigned short min; |
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#ifdef CONFIG_SMP |
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pvr = per_cpu(cpu_pvr, cpu_id); |
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#else |
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pvr = mfspr(SPRN_PVR); |
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#endif |
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maj = (pvr >> 8) & 0xFF; |
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min = pvr & 0xFF; |
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seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id); |
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if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name) |
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seq_puts(m, cur_cpu_spec->cpu_name); |
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else |
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seq_printf(m, "unknown (%08x)", pvr); |
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if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
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seq_puts(m, ", altivec supported"); |
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seq_putc(m, '\n'); |
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#ifdef CONFIG_TAU |
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if (cpu_has_feature(CPU_FTR_TAU)) { |
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if (IS_ENABLED(CONFIG_TAU_AVERAGE)) { |
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/* more straightforward, but potentially misleading */ |
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seq_printf(m, "temperature \t: %u C (uncalibrated)\n", |
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cpu_temp(cpu_id)); |
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} else { |
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/* show the actual temp sensor range */ |
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u32 temp; |
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temp = cpu_temp_both(cpu_id); |
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seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", |
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temp & 0xff, temp >> 16); |
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} |
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} |
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#endif /* CONFIG_TAU */ |
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/* |
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* Platforms that have variable clock rates, should implement |
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* the method ppc_md.get_proc_freq() that reports the clock |
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* rate of a given cpu. The rest can use ppc_proc_freq to |
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* report the clock rate that is same across all cpus. |
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*/ |
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if (ppc_md.get_proc_freq) |
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proc_freq = ppc_md.get_proc_freq(cpu_id); |
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else |
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proc_freq = ppc_proc_freq; |
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if (proc_freq) |
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seq_printf(m, "clock\t\t: %lu.%06luMHz\n", |
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proc_freq / 1000000, proc_freq % 1000000); |
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if (ppc_md.show_percpuinfo != NULL) |
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ppc_md.show_percpuinfo(m, cpu_id); |
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/* If we are a Freescale core do a simple check so |
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* we dont have to keep adding cases in the future */ |
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if (PVR_VER(pvr) & 0x8000) { |
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switch (PVR_VER(pvr)) { |
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case 0x8000: /* 7441/7450/7451, Voyager */ |
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case 0x8001: /* 7445/7455, Apollo 6 */ |
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case 0x8002: /* 7447/7457, Apollo 7 */ |
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case 0x8003: /* 7447A, Apollo 7 PM */ |
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case 0x8004: /* 7448, Apollo 8 */ |
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case 0x800c: /* 7410, Nitro */ |
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maj = ((pvr >> 8) & 0xF); |
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min = PVR_MIN(pvr); |
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break; |
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default: /* e500/book-e */ |
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maj = PVR_MAJ(pvr); |
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min = PVR_MIN(pvr); |
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break; |
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} |
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} else { |
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switch (PVR_VER(pvr)) { |
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case 0x1008: /* 740P/750P ?? */ |
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maj = ((pvr >> 8) & 0xFF) - 1; |
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min = pvr & 0xFF; |
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break; |
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case 0x004e: /* POWER9 bits 12-15 give chip type */ |
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case 0x0080: /* POWER10 bit 12 gives SMT8/4 */ |
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maj = (pvr >> 8) & 0x0F; |
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min = pvr & 0xFF; |
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break; |
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default: |
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maj = (pvr >> 8) & 0xFF; |
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min = pvr & 0xFF; |
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break; |
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} |
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} |
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seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", |
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maj, min, PVR_VER(pvr), PVR_REV(pvr)); |
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if (IS_ENABLED(CONFIG_PPC32)) |
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seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ), |
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(loops_per_jiffy / (5000 / HZ)) % 100); |
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seq_putc(m, '\n'); |
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/* If this is the last cpu, print the summary */ |
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if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) |
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show_cpuinfo_summary(m); |
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return 0; |
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} |
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static void *c_start(struct seq_file *m, loff_t *pos) |
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{ |
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if (*pos == 0) /* just in case, cpu 0 is not the first */ |
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*pos = cpumask_first(cpu_online_mask); |
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else |
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*pos = cpumask_next(*pos - 1, cpu_online_mask); |
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if ((*pos) < nr_cpu_ids) |
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return (void *)(unsigned long)(*pos + 1); |
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return NULL; |
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} |
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static void *c_next(struct seq_file *m, void *v, loff_t *pos) |
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{ |
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(*pos)++; |
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return c_start(m, pos); |
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} |
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static void c_stop(struct seq_file *m, void *v) |
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{ |
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} |
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const struct seq_operations cpuinfo_op = { |
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.start = c_start, |
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.next = c_next, |
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.stop = c_stop, |
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.show = show_cpuinfo, |
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}; |
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void __init check_for_initrd(void) |
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{ |
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#ifdef CONFIG_BLK_DEV_INITRD |
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DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", |
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initrd_start, initrd_end); |
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/* If we were passed an initrd, set the ROOT_DEV properly if the values |
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* look sensible. If not, clear initrd reference. |
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*/ |
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if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && |
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initrd_end > initrd_start) |
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ROOT_DEV = Root_RAM0; |
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else |
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initrd_start = initrd_end = 0; |
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if (initrd_start) |
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pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); |
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DBG(" <- check_for_initrd()\n"); |
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#endif /* CONFIG_BLK_DEV_INITRD */ |
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} |
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#ifdef CONFIG_SMP |
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int threads_per_core, threads_per_subcore, threads_shift __read_mostly; |
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cpumask_t threads_core_mask __read_mostly; |
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EXPORT_SYMBOL_GPL(threads_per_core); |
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EXPORT_SYMBOL_GPL(threads_per_subcore); |
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EXPORT_SYMBOL_GPL(threads_shift); |
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EXPORT_SYMBOL_GPL(threads_core_mask); |
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static void __init cpu_init_thread_core_maps(int tpc) |
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{ |
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int i; |
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threads_per_core = tpc; |
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threads_per_subcore = tpc; |
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cpumask_clear(&threads_core_mask); |
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/* This implementation only supports power of 2 number of threads |
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* for simplicity and performance |
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*/ |
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threads_shift = ilog2(tpc); |
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BUG_ON(tpc != (1 << threads_shift)); |
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for (i = 0; i < tpc; i++) |
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cpumask_set_cpu(i, &threads_core_mask); |
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printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", |
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tpc, tpc > 1 ? "s" : ""); |
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printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); |
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} |
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u32 *cpu_to_phys_id = NULL; |
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/** |
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* setup_cpu_maps - initialize the following cpu maps: |
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* cpu_possible_mask |
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* cpu_present_mask |
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* |
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* Having the possible map set up early allows us to restrict allocations |
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* of things like irqstacks to nr_cpu_ids rather than NR_CPUS. |
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* |
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* We do not initialize the online map here; cpus set their own bits in |
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* cpu_online_mask as they come up. |
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* |
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* This function is valid only for Open Firmware systems. finish_device_tree |
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* must be called before using this. |
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* |
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* While we're here, we may as well set the "physical" cpu ids in the paca. |
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* |
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* NOTE: This must match the parsing done in early_init_dt_scan_cpus. |
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*/ |
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void __init smp_setup_cpu_maps(void) |
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{ |
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struct device_node *dn; |
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int cpu = 0; |
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int nthreads = 1; |
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DBG("smp_setup_cpu_maps()\n"); |
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cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32), |
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__alignof__(u32)); |
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if (!cpu_to_phys_id) |
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panic("%s: Failed to allocate %zu bytes align=0x%zx\n", |
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__func__, nr_cpu_ids * sizeof(u32), __alignof__(u32)); |
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for_each_node_by_type(dn, "cpu") { |
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const __be32 *intserv; |
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__be32 cpu_be; |
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int j, len; |
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DBG(" * %pOF...\n", dn); |
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intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", |
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&len); |
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if (intserv) { |
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DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", |
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nthreads); |
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} else { |
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DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); |
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intserv = of_get_property(dn, "reg", &len); |
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if (!intserv) { |
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cpu_be = cpu_to_be32(cpu); |
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/* XXX: what is this? uninitialized?? */ |
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intserv = &cpu_be; /* assume logical == phys */ |
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len = 4; |
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} |
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} |
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nthreads = len / sizeof(int); |
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for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { |
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bool avail; |
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DBG(" thread %d -> cpu %d (hard id %d)\n", |
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j, cpu, be32_to_cpu(intserv[j])); |
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avail = of_device_is_available(dn); |
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if (!avail) |
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avail = !of_property_match_string(dn, |
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"enable-method", "spin-table"); |
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set_cpu_present(cpu, avail); |
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set_cpu_possible(cpu, true); |
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cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]); |
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cpu++; |
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} |
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if (cpu >= nr_cpu_ids) { |
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of_node_put(dn); |
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break; |
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} |
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} |
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|
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/* If no SMT supported, nthreads is forced to 1 */ |
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if (!cpu_has_feature(CPU_FTR_SMT)) { |
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DBG(" SMT disabled ! nthreads forced to 1\n"); |
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nthreads = 1; |
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} |
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|
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#ifdef CONFIG_PPC64 |
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/* |
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* On pSeries LPAR, we need to know how many cpus |
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* could possibly be added to this partition. |
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*/ |
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if (firmware_has_feature(FW_FEATURE_LPAR) && |
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(dn = of_find_node_by_path("/rtas"))) { |
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int num_addr_cell, num_size_cell, maxcpus; |
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const __be32 *ireg; |
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num_addr_cell = of_n_addr_cells(dn); |
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num_size_cell = of_n_size_cells(dn); |
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ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); |
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|
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if (!ireg) |
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goto out; |
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maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); |
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|
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/* Double maxcpus for processors which have SMT capability */ |
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if (cpu_has_feature(CPU_FTR_SMT)) |
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maxcpus *= nthreads; |
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if (maxcpus > nr_cpu_ids) { |
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printk(KERN_WARNING |
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"Partition configured for %d cpus, " |
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"operating system maximum is %u.\n", |
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maxcpus, nr_cpu_ids); |
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maxcpus = nr_cpu_ids; |
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} else |
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printk(KERN_INFO "Partition configured for %d cpus.\n", |
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maxcpus); |
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for (cpu = 0; cpu < maxcpus; cpu++) |
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set_cpu_possible(cpu, true); |
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out: |
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of_node_put(dn); |
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} |
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vdso_data->processorCount = num_present_cpus(); |
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#endif /* CONFIG_PPC64 */ |
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|
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/* Initialize CPU <=> thread mapping/ |
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* |
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* WARNING: We assume that the number of threads is the same for |
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* every CPU in the system. If that is not the case, then some code |
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* here will have to be reworked |
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*/ |
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cpu_init_thread_core_maps(nthreads); |
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|
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/* Now that possible cpus are set, set nr_cpu_ids for later use */ |
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setup_nr_cpu_ids(); |
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|
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free_unused_pacas(); |
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} |
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#endif /* CONFIG_SMP */ |
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|
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#ifdef CONFIG_PCSPKR_PLATFORM |
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static __init int add_pcspkr(void) |
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{ |
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struct device_node *np; |
|
struct platform_device *pd; |
|
int ret; |
|
|
|
np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); |
|
of_node_put(np); |
|
if (!np) |
|
return -ENODEV; |
|
|
|
pd = platform_device_alloc("pcspkr", -1); |
|
if (!pd) |
|
return -ENOMEM; |
|
|
|
ret = platform_device_add(pd); |
|
if (ret) |
|
platform_device_put(pd); |
|
|
|
return ret; |
|
} |
|
device_initcall(add_pcspkr); |
|
#endif /* CONFIG_PCSPKR_PLATFORM */ |
|
|
|
void probe_machine(void) |
|
{ |
|
extern struct machdep_calls __machine_desc_start; |
|
extern struct machdep_calls __machine_desc_end; |
|
unsigned int i; |
|
|
|
/* |
|
* Iterate all ppc_md structures until we find the proper |
|
* one for the current machine type |
|
*/ |
|
DBG("Probing machine type ...\n"); |
|
|
|
/* |
|
* Check ppc_md is empty, if not we have a bug, ie, we setup an |
|
* entry before probe_machine() which will be overwritten |
|
*/ |
|
for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { |
|
if (((void **)&ppc_md)[i]) { |
|
printk(KERN_ERR "Entry %d in ppc_md non empty before" |
|
" machine probe !\n", i); |
|
} |
|
} |
|
|
|
for (machine_id = &__machine_desc_start; |
|
machine_id < &__machine_desc_end; |
|
machine_id++) { |
|
DBG(" %s ...", machine_id->name); |
|
memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); |
|
if (ppc_md.probe()) { |
|
DBG(" match !\n"); |
|
break; |
|
} |
|
DBG("\n"); |
|
} |
|
/* What can we do if we didn't find ? */ |
|
if (machine_id >= &__machine_desc_end) { |
|
pr_err("No suitable machine description found !\n"); |
|
for (;;); |
|
} |
|
|
|
printk(KERN_INFO "Using %s machine description\n", ppc_md.name); |
|
} |
|
|
|
/* Match a class of boards, not a specific device configuration. */ |
|
int check_legacy_ioport(unsigned long base_port) |
|
{ |
|
struct device_node *parent, *np = NULL; |
|
int ret = -ENODEV; |
|
|
|
switch(base_port) { |
|
case I8042_DATA_REG: |
|
if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) |
|
np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); |
|
if (np) { |
|
parent = of_get_parent(np); |
|
|
|
of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); |
|
if (!of_i8042_kbd_irq) |
|
of_i8042_kbd_irq = 1; |
|
|
|
of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); |
|
if (!of_i8042_aux_irq) |
|
of_i8042_aux_irq = 12; |
|
|
|
of_node_put(np); |
|
np = parent; |
|
break; |
|
} |
|
np = of_find_node_by_type(NULL, "8042"); |
|
/* Pegasos has no device_type on its 8042 node, look for the |
|
* name instead */ |
|
if (!np) |
|
np = of_find_node_by_name(NULL, "8042"); |
|
if (np) { |
|
of_i8042_kbd_irq = 1; |
|
of_i8042_aux_irq = 12; |
|
} |
|
break; |
|
case FDC_BASE: /* FDC1 */ |
|
np = of_find_node_by_type(NULL, "fdc"); |
|
break; |
|
default: |
|
/* ipmi is supposed to fail here */ |
|
break; |
|
} |
|
if (!np) |
|
return ret; |
|
parent = of_get_parent(np); |
|
if (parent) { |
|
if (of_node_is_type(parent, "isa")) |
|
ret = 0; |
|
of_node_put(parent); |
|
} |
|
of_node_put(np); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(check_legacy_ioport); |
|
|
|
static int ppc_panic_event(struct notifier_block *this, |
|
unsigned long event, void *ptr) |
|
{ |
|
/* |
|
* panic does a local_irq_disable, but we really |
|
* want interrupts to be hard disabled. |
|
*/ |
|
hard_irq_disable(); |
|
|
|
/* |
|
* If firmware-assisted dump has been registered then trigger |
|
* firmware-assisted dump and let firmware handle everything else. |
|
*/ |
|
crash_fadump(NULL, ptr); |
|
if (ppc_md.panic) |
|
ppc_md.panic(ptr); /* May not return */ |
|
return NOTIFY_DONE; |
|
} |
|
|
|
static struct notifier_block ppc_panic_block = { |
|
.notifier_call = ppc_panic_event, |
|
.priority = INT_MIN /* may not return; must be done last */ |
|
}; |
|
|
|
/* |
|
* Dump out kernel offset information on panic. |
|
*/ |
|
static int dump_kernel_offset(struct notifier_block *self, unsigned long v, |
|
void *p) |
|
{ |
|
pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n", |
|
kaslr_offset(), KERNELBASE); |
|
|
|
return 0; |
|
} |
|
|
|
static struct notifier_block kernel_offset_notifier = { |
|
.notifier_call = dump_kernel_offset |
|
}; |
|
|
|
void __init setup_panic(void) |
|
{ |
|
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0) |
|
atomic_notifier_chain_register(&panic_notifier_list, |
|
&kernel_offset_notifier); |
|
|
|
/* PPC64 always does a hard irq disable in its panic handler */ |
|
if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic) |
|
return; |
|
atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); |
|
} |
|
|
|
#ifdef CONFIG_CHECK_CACHE_COHERENCY |
|
/* |
|
* For platforms that have configurable cache-coherency. This function |
|
* checks that the cache coherency setting of the kernel matches the setting |
|
* left by the firmware, as indicated in the device tree. Since a mismatch |
|
* will eventually result in DMA failures, we print * and error and call |
|
* BUG() in that case. |
|
*/ |
|
|
|
#define KERNEL_COHERENCY (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE)) |
|
|
|
static int __init check_cache_coherency(void) |
|
{ |
|
struct device_node *np; |
|
const void *prop; |
|
bool devtree_coherency; |
|
|
|
np = of_find_node_by_path("/"); |
|
prop = of_get_property(np, "coherency-off", NULL); |
|
of_node_put(np); |
|
|
|
devtree_coherency = prop ? false : true; |
|
|
|
if (devtree_coherency != KERNEL_COHERENCY) { |
|
printk(KERN_ERR |
|
"kernel coherency:%s != device tree_coherency:%s\n", |
|
KERNEL_COHERENCY ? "on" : "off", |
|
devtree_coherency ? "on" : "off"); |
|
BUG(); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
late_initcall(check_cache_coherency); |
|
#endif /* CONFIG_CHECK_CACHE_COHERENCY */ |
|
|
|
#ifdef CONFIG_DEBUG_FS |
|
struct dentry *powerpc_debugfs_root; |
|
EXPORT_SYMBOL(powerpc_debugfs_root); |
|
|
|
static int powerpc_debugfs_init(void) |
|
{ |
|
powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); |
|
return 0; |
|
} |
|
arch_initcall(powerpc_debugfs_init); |
|
#endif |
|
|
|
void ppc_printk_progress(char *s, unsigned short hex) |
|
{ |
|
pr_info("%s\n", s); |
|
} |
|
|
|
static __init void print_system_info(void) |
|
{ |
|
pr_info("-----------------------------------------------------\n"); |
|
pr_info("phys_mem_size = 0x%llx\n", |
|
(unsigned long long)memblock_phys_mem_size()); |
|
|
|
pr_info("dcache_bsize = 0x%x\n", dcache_bsize); |
|
pr_info("icache_bsize = 0x%x\n", icache_bsize); |
|
|
|
pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); |
|
pr_info(" possible = 0x%016lx\n", |
|
(unsigned long)CPU_FTRS_POSSIBLE); |
|
pr_info(" always = 0x%016lx\n", |
|
(unsigned long)CPU_FTRS_ALWAYS); |
|
pr_info("cpu_user_features = 0x%08x 0x%08x\n", |
|
cur_cpu_spec->cpu_user_features, |
|
cur_cpu_spec->cpu_user_features2); |
|
pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); |
|
#ifdef CONFIG_PPC64 |
|
pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); |
|
#ifdef CONFIG_PPC_BOOK3S |
|
pr_info("vmalloc start = 0x%lx\n", KERN_VIRT_START); |
|
pr_info("IO start = 0x%lx\n", KERN_IO_START); |
|
pr_info("vmemmap start = 0x%lx\n", (unsigned long)vmemmap); |
|
#endif |
|
#endif |
|
|
|
if (!early_radix_enabled()) |
|
print_system_hash_info(); |
|
|
|
if (PHYSICAL_START > 0) |
|
pr_info("physical_start = 0x%llx\n", |
|
(unsigned long long)PHYSICAL_START); |
|
pr_info("-----------------------------------------------------\n"); |
|
} |
|
|
|
#ifdef CONFIG_SMP |
|
static void __init smp_setup_pacas(void) |
|
{ |
|
int cpu; |
|
|
|
for_each_possible_cpu(cpu) { |
|
if (cpu == smp_processor_id()) |
|
continue; |
|
allocate_paca(cpu); |
|
set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]); |
|
} |
|
|
|
memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32)); |
|
cpu_to_phys_id = NULL; |
|
} |
|
#endif |
|
|
|
/* |
|
* Called into from start_kernel this initializes memblock, which is used |
|
* to manage page allocation until mem_init is called. |
|
*/ |
|
void __init setup_arch(char **cmdline_p) |
|
{ |
|
kasan_init(); |
|
|
|
*cmdline_p = boot_command_line; |
|
|
|
/* Set a half-reasonable default so udelay does something sensible */ |
|
loops_per_jiffy = 500000000 / HZ; |
|
|
|
/* Unflatten the device-tree passed by prom_init or kexec */ |
|
unflatten_device_tree(); |
|
|
|
/* |
|
* Initialize cache line/block info from device-tree (on ppc64) or |
|
* just cputable (on ppc32). |
|
*/ |
|
initialize_cache_info(); |
|
|
|
/* Initialize RTAS if available. */ |
|
rtas_initialize(); |
|
|
|
/* Check if we have an initrd provided via the device-tree. */ |
|
check_for_initrd(); |
|
|
|
/* Probe the machine type, establish ppc_md. */ |
|
probe_machine(); |
|
|
|
/* Setup panic notifier if requested by the platform. */ |
|
setup_panic(); |
|
|
|
/* |
|
* Configure ppc_md.power_save (ppc32 only, 64-bit machines do |
|
* it from their respective probe() function. |
|
*/ |
|
setup_power_save(); |
|
|
|
/* Discover standard serial ports. */ |
|
find_legacy_serial_ports(); |
|
|
|
/* Register early console with the printk subsystem. */ |
|
register_early_udbg_console(); |
|
|
|
/* Setup the various CPU maps based on the device-tree. */ |
|
smp_setup_cpu_maps(); |
|
|
|
/* Initialize xmon. */ |
|
xmon_setup(); |
|
|
|
/* Check the SMT related command line arguments (ppc64). */ |
|
check_smt_enabled(); |
|
|
|
/* Parse memory topology */ |
|
mem_topology_setup(); |
|
|
|
/* |
|
* Release secondary cpus out of their spinloops at 0x60 now that |
|
* we can map physical -> logical CPU ids. |
|
* |
|
* Freescale Book3e parts spin in a loop provided by firmware, |
|
* so smp_release_cpus() does nothing for them. |
|
*/ |
|
#ifdef CONFIG_SMP |
|
smp_setup_pacas(); |
|
|
|
/* On BookE, setup per-core TLB data structures. */ |
|
setup_tlb_core_data(); |
|
#endif |
|
|
|
/* Print various info about the machine that has been gathered so far. */ |
|
print_system_info(); |
|
|
|
/* Reserve large chunks of memory for use by CMA for KVM. */ |
|
kvm_cma_reserve(); |
|
|
|
/* Reserve large chunks of memory for us by CMA for hugetlb */ |
|
gigantic_hugetlb_cma_reserve(); |
|
|
|
klp_init_thread_info(&init_task); |
|
|
|
setup_initial_init_mm(_stext, _etext, _edata, _end); |
|
|
|
mm_iommu_init(&init_mm); |
|
irqstack_early_init(); |
|
exc_lvl_early_init(); |
|
emergency_stack_init(); |
|
|
|
mce_init(); |
|
smp_release_cpus(); |
|
|
|
initmem_init(); |
|
|
|
early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); |
|
|
|
if (ppc_md.setup_arch) |
|
ppc_md.setup_arch(); |
|
|
|
setup_barrier_nospec(); |
|
setup_spectre_v2(); |
|
|
|
paging_init(); |
|
|
|
/* Initialize the MMU context management stuff. */ |
|
mmu_context_init(); |
|
|
|
/* Interrupt code needs to be 64K-aligned. */ |
|
if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff) |
|
panic("Kernelbase not 64K-aligned (0x%lx)!\n", |
|
(unsigned long)_stext); |
|
}
|
|
|