diff options
Diffstat (limited to 'arch/i386/kernel/setup.c')
| -rw-r--r-- | arch/i386/kernel/setup.c | 69 |
1 files changed, 66 insertions, 3 deletions
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c index 30406fd0b64..7306353c520 100644 --- a/arch/i386/kernel/setup.c +++ b/arch/i386/kernel/setup.c @@ -43,7 +43,12 @@ #include <linux/init.h> #include <linux/edd.h> #include <linux/nodemask.h> +#include <linux/kexec.h> +#include <linux/crash_dump.h> + #include <video/edid.h> + +#include <asm/apic.h> #include <asm/e820.h> #include <asm/mpspec.h> #include <asm/setup.h> @@ -55,12 +60,15 @@ #include "setup_arch_pre.h" #include <bios_ebda.h> +/* Forward Declaration. */ +void __init find_max_pfn(void); + /* This value is set up by the early boot code to point to the value immediately after the boot time page tables. It contains a *physical* address, and must not be in the .bss segment! */ unsigned long init_pg_tables_end __initdata = ~0UL; -int disable_pse __initdata = 0; +int disable_pse __devinitdata = 0; /* * Machine setup.. @@ -732,6 +740,15 @@ static void __init parse_cmdline_early (char ** cmdline_p) if (to != command_line) to--; if (!memcmp(from+7, "exactmap", 8)) { +#ifdef CONFIG_CRASH_DUMP + /* If we are doing a crash dump, we + * still need to know the real mem + * size before original memory map is + * reset. + */ + find_max_pfn(); + saved_max_pfn = max_pfn; +#endif from += 8+7; e820.nr_map = 0; userdef = 1; @@ -835,6 +852,44 @@ static void __init parse_cmdline_early (char ** cmdline_p) #endif /* CONFIG_X86_LOCAL_APIC */ #endif /* CONFIG_ACPI_BOOT */ +#ifdef CONFIG_X86_LOCAL_APIC + /* enable local APIC */ + else if (!memcmp(from, "lapic", 5)) + lapic_enable(); + + /* disable local APIC */ + else if (!memcmp(from, "nolapic", 6)) + lapic_disable(); +#endif /* CONFIG_X86_LOCAL_APIC */ + +#ifdef CONFIG_KEXEC + /* crashkernel=size@addr specifies the location to reserve for + * a crash kernel. By reserving this memory we guarantee + * that linux never set's it up as a DMA target. + * Useful for holding code to do something appropriate + * after a kernel panic. + */ + else if (!memcmp(from, "crashkernel=", 12)) { + unsigned long size, base; + size = memparse(from+12, &from); + if (*from == '@') { + base = memparse(from+1, &from); + /* FIXME: Do I want a sanity check + * to validate the memory range? + */ + crashk_res.start = base; + crashk_res.end = base + size - 1; + } + } +#endif +#ifdef CONFIG_CRASH_DUMP + /* elfcorehdr= specifies the location of elf core header + * stored by the crashed kernel. + */ + else if (!memcmp(from, "elfcorehdr=", 11)) + elfcorehdr_addr = memparse(from+11, &from); +#endif + /* * highmem=size forces highmem to be exactly 'size' bytes. * This works even on boxes that have no highmem otherwise. @@ -1113,8 +1168,8 @@ void __init setup_bootmem_allocator(void) * the (very unlikely) case of us accidentally initializing the * bootmem allocator with an invalid RAM area. */ - reserve_bootmem(HIGH_MEMORY, (PFN_PHYS(min_low_pfn) + - bootmap_size + PAGE_SIZE-1) - (HIGH_MEMORY)); + reserve_bootmem(__PHYSICAL_START, (PFN_PHYS(min_low_pfn) + + bootmap_size + PAGE_SIZE-1) - (__PHYSICAL_START)); /* * reserve physical page 0 - it's a special BIOS page on many boxes, @@ -1170,6 +1225,11 @@ void __init setup_bootmem_allocator(void) } } #endif +#ifdef CONFIG_KEXEC + if (crashk_res.start != crashk_res.end) + reserve_bootmem(crashk_res.start, + crashk_res.end - crashk_res.start + 1); +#endif } /* @@ -1223,6 +1283,9 @@ legacy_init_iomem_resources(struct resource *code_resource, struct resource *dat */ request_resource(res, code_resource); request_resource(res, data_resource); +#ifdef CONFIG_KEXEC + request_resource(res, &crashk_res); +#endif } } } |