diff options
Diffstat (limited to 'arch/arm/kernel/setup.c')
| -rw-r--r-- | arch/arm/kernel/setup.c | 157 |
1 files changed, 150 insertions, 7 deletions
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 122d999bdc7..336f14e0e5c 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -19,12 +19,15 @@ #include <linux/seq_file.h> #include <linux/screen_info.h> #include <linux/init.h> +#include <linux/kexec.h> +#include <linux/crash_dump.h> #include <linux/root_dev.h> #include <linux/cpu.h> #include <linux/interrupt.h> #include <linux/smp.h> #include <linux/fs.h> #include <linux/proc_fs.h> +#include <linux/memblock.h> #include <asm/unified.h> #include <asm/cpu.h> @@ -33,6 +36,7 @@ #include <asm/procinfo.h> #include <asm/sections.h> #include <asm/setup.h> +#include <asm/smp_plat.h> #include <asm/mach-types.h> #include <asm/cacheflush.h> #include <asm/cachetype.h> @@ -44,7 +48,9 @@ #include <asm/traps.h> #include <asm/unwind.h> +#if defined(CONFIG_DEPRECATED_PARAM_STRUCT) #include "compat.h" +#endif #include "atags.h" #include "tcm.h" @@ -233,6 +239,35 @@ int cpu_architecture(void) return cpu_arch; } +static int cpu_has_aliasing_icache(unsigned int arch) +{ + int aliasing_icache; + unsigned int id_reg, num_sets, line_size; + + /* arch specifies the register format */ + switch (arch) { + case CPU_ARCH_ARMv7: + asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR" + : /* No output operands */ + : "r" (1)); + isb(); + asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR" + : "=r" (id_reg)); + line_size = 4 << ((id_reg & 0x7) + 2); + num_sets = ((id_reg >> 13) & 0x7fff) + 1; + aliasing_icache = (line_size * num_sets) > PAGE_SIZE; + break; + case CPU_ARCH_ARMv6: + aliasing_icache = read_cpuid_cachetype() & (1 << 11); + break; + default: + /* I-cache aliases will be handled by D-cache aliasing code */ + aliasing_icache = 0; + } + + return aliasing_icache; +} + static void __init cacheid_init(void) { unsigned int cachetype = read_cpuid_cachetype(); @@ -244,10 +279,15 @@ static void __init cacheid_init(void) cacheid = CACHEID_VIPT_NONALIASING; if ((cachetype & (3 << 14)) == 1 << 14) cacheid |= CACHEID_ASID_TAGGED; - } else if (cachetype & (1 << 23)) + else if (cpu_has_aliasing_icache(CPU_ARCH_ARMv7)) + cacheid |= CACHEID_VIPT_I_ALIASING; + } else if (cachetype & (1 << 23)) { cacheid = CACHEID_VIPT_ALIASING; - else + } else { cacheid = CACHEID_VIPT_NONALIASING; + if (cpu_has_aliasing_icache(CPU_ARCH_ARMv6)) + cacheid |= CACHEID_VIPT_I_ALIASING; + } } else { cacheid = CACHEID_VIVT; } @@ -258,7 +298,7 @@ static void __init cacheid_init(void) cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown", cache_is_vivt() ? "VIVT" : icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" : - cache_is_vipt_aliasing() ? "VIPT aliasing" : + icache_is_vipt_aliasing() ? "VIPT aliasing" : cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown"); } @@ -269,6 +309,21 @@ static void __init cacheid_init(void) extern struct proc_info_list *lookup_processor_type(unsigned int); extern struct machine_desc *lookup_machine_type(unsigned int); +static void __init feat_v6_fixup(void) +{ + int id = read_cpuid_id(); + + if ((id & 0xff0f0000) != 0x41070000) + return; + + /* + * HWCAP_TLS is available only on 1136 r1p0 and later, + * see also kuser_get_tls_init. + */ + if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0)) + elf_hwcap &= ~HWCAP_TLS; +} + static void __init setup_processor(void) { struct proc_info_list *list; @@ -311,6 +366,8 @@ static void __init setup_processor(void) elf_hwcap &= ~HWCAP_THUMB; #endif + feat_v6_fixup(); + cacheid_init(); cpu_proc_init(); } @@ -402,13 +459,12 @@ static int __init arm_add_memory(unsigned long start, unsigned long size) size -= start & ~PAGE_MASK; bank->start = PAGE_ALIGN(start); bank->size = size & PAGE_MASK; - bank->node = PHYS_TO_NID(start); /* * Check whether this memory region has non-zero size or * invalid node number. */ - if (bank->size == 0 || bank->node >= MAX_NUMNODES) + if (bank->size == 0) return -EINVAL; meminfo.nr_banks++; @@ -469,7 +525,7 @@ request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc) kernel_code.start = virt_to_phys(_text); kernel_code.end = virt_to_phys(_etext - 1); - kernel_data.start = virt_to_phys(_data); + kernel_data.start = virt_to_phys(_sdata); kernel_data.end = virt_to_phys(_end - 1); for (i = 0; i < mi->nr_banks; i++) { @@ -663,6 +719,86 @@ static int __init customize_machine(void) } arch_initcall(customize_machine); +#ifdef CONFIG_KEXEC +static inline unsigned long long get_total_mem(void) +{ + unsigned long total; + + total = max_low_pfn - min_low_pfn; + return total << PAGE_SHIFT; +} + +/** + * reserve_crashkernel() - reserves memory are for crash kernel + * + * This function reserves memory area given in "crashkernel=" kernel command + * line parameter. The memory reserved is used by a dump capture kernel when + * primary kernel is crashing. + */ +static void __init reserve_crashkernel(void) +{ + unsigned long long crash_size, crash_base; + unsigned long long total_mem; + int ret; + + total_mem = get_total_mem(); + ret = parse_crashkernel(boot_command_line, total_mem, + &crash_size, &crash_base); + if (ret) + return; + + ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE); + if (ret < 0) { + printk(KERN_WARNING "crashkernel reservation failed - " + "memory is in use (0x%lx)\n", (unsigned long)crash_base); + return; + } + + printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " + "for crashkernel (System RAM: %ldMB)\n", + (unsigned long)(crash_size >> 20), + (unsigned long)(crash_base >> 20), + (unsigned long)(total_mem >> 20)); + + crashk_res.start = crash_base; + crashk_res.end = crash_base + crash_size - 1; + insert_resource(&iomem_resource, &crashk_res); +} +#else +static inline void reserve_crashkernel(void) {} +#endif /* CONFIG_KEXEC */ + +/* + * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by + * is_kdump_kernel() to determine if we are booting after a panic. Hence + * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE. + */ + +#ifdef CONFIG_CRASH_DUMP +/* + * elfcorehdr= specifies the location of elf core header stored by the crashed + * kernel. This option will be passed by kexec loader to the capture kernel. + */ +static int __init setup_elfcorehdr(char *arg) +{ + char *end; + + if (!arg) + return -EINVAL; + + elfcorehdr_addr = memparse(arg, &end); + return end > arg ? 0 : -EINVAL; +} +early_param("elfcorehdr", setup_elfcorehdr); +#endif /* CONFIG_CRASH_DUMP */ + +static void __init squash_mem_tags(struct tag *tag) +{ + for (; tag->hdr.size; tag = tag_next(tag)) + if (tag->hdr.tag == ATAG_MEM) + tag->hdr.tag = ATAG_NONE; +} + void __init setup_arch(char **cmdline_p) { struct tag *tags = (struct tag *)&init_tags; @@ -683,12 +819,14 @@ void __init setup_arch(char **cmdline_p) else if (mdesc->boot_params) tags = phys_to_virt(mdesc->boot_params); +#if defined(CONFIG_DEPRECATED_PARAM_STRUCT) /* * If we have the old style parameters, convert them to * a tag list. */ if (tags->hdr.tag != ATAG_CORE) convert_to_tag_list(tags); +#endif if (tags->hdr.tag != ATAG_CORE) tags = (struct tag *)&init_tags; @@ -716,12 +854,16 @@ void __init setup_arch(char **cmdline_p) parse_early_param(); + arm_memblock_init(&meminfo, mdesc); + paging_init(mdesc); request_standard_resources(&meminfo, mdesc); #ifdef CONFIG_SMP - smp_init_cpus(); + if (is_smp()) + smp_init_cpus(); #endif + reserve_crashkernel(); cpu_init(); tcm_init(); @@ -729,6 +871,7 @@ void __init setup_arch(char **cmdline_p) /* * Set up various architecture-specific pointers */ + arch_nr_irqs = mdesc->nr_irqs; init_arch_irq = mdesc->init_irq; system_timer = mdesc->timer; init_machine = mdesc->init_machine; |