diff options
Diffstat (limited to 'arch/x86/kernel/setup.c')
-rw-r--r-- | arch/x86/kernel/setup.c | 69 |
1 files changed, 31 insertions, 38 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 72920af0b3c0..85acd22f8022 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -44,6 +44,7 @@ #include <asm/pci-direct.h> #include <asm/prom.h> #include <asm/proto.h> +#include <asm/thermal.h> #include <asm/unwind.h> #include <asm/vsyscall.h> #include <linux/vmalloc.h> @@ -637,11 +638,11 @@ static void __init trim_snb_memory(void) * them from accessing certain memory ranges, namely anything below * 1M and in the pages listed in bad_pages[] above. * - * To avoid these pages being ever accessed by SNB gfx devices - * reserve all memory below the 1 MB mark and bad_pages that have - * not already been reserved at boot time. + * To avoid these pages being ever accessed by SNB gfx devices reserve + * bad_pages that have not already been reserved at boot time. + * All memory below the 1 MB mark is anyway reserved later during + * setup_arch(), so there is no need to reserve it here. */ - memblock_reserve(0, 1<<20); for (i = 0; i < ARRAY_SIZE(bad_pages); i++) { if (memblock_reserve(bad_pages[i], PAGE_SIZE)) @@ -694,30 +695,6 @@ static void __init e820_add_kernel_range(void) e820__range_add(start, size, E820_TYPE_RAM); } -static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10; - -static int __init parse_reservelow(char *p) -{ - unsigned long long size; - - if (!p) - return -EINVAL; - - size = memparse(p, &p); - - if (size < 4096) - size = 4096; - - if (size > 640*1024) - size = 640*1024; - - reserve_low = size; - - return 0; -} - -early_param("reservelow", parse_reservelow); - static void __init early_reserve_memory(void) { /* @@ -733,14 +710,14 @@ static void __init early_reserve_memory(void) * The first 4Kb of memory is a BIOS owned area, but generally it is * not listed as such in the E820 table. * - * Reserve the first memory page and typically some additional - * memory (64KiB by default) since some BIOSes are known to corrupt - * low memory. See the Kconfig help text for X86_RESERVE_LOW. + * Reserve the first 64K of memory since some BIOSes are known to + * corrupt low memory. After the real mode trampoline is allocated the + * rest of the memory below 640k is reserved. * * In addition, make sure page 0 is always reserved because on * systems with L1TF its contents can be leaked to user processes. */ - memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE)); + memblock_reserve(0, SZ_64K); early_reserve_initrd(); @@ -751,6 +728,7 @@ static void __init early_reserve_memory(void) reserve_ibft_region(); reserve_bios_regions(); + trim_snb_memory(); } /* @@ -1081,14 +1059,21 @@ void __init setup_arch(char **cmdline_p) (max_pfn_mapped<<PAGE_SHIFT) - 1); #endif - reserve_real_mode(); - /* - * Reserving memory causing GPU hangs on Sandy Bridge integrated - * graphics devices should be done after we allocated memory under - * 1M for the real mode trampoline. + * Find free memory for the real mode trampoline and place it there. If + * there is not enough free memory under 1M, on EFI-enabled systems + * there will be additional attempt to reclaim the memory for the real + * mode trampoline at efi_free_boot_services(). + * + * Unconditionally reserve the entire first 1M of RAM because BIOSes + * are known to corrupt low memory and several hundred kilobytes are not + * worth complex detection what memory gets clobbered. Windows does the + * same thing for very similar reasons. + * + * Moreover, on machines with SandyBridge graphics or in setups that use + * crashkernel the entire 1M is reserved anyway. */ - trim_snb_memory(); + reserve_real_mode(); init_mem_mapping(); @@ -1226,6 +1211,14 @@ void __init setup_arch(char **cmdline_p) x86_init.timers.wallclock_init(); + /* + * This needs to run before setup_local_APIC() which soft-disables the + * local APIC temporarily and that masks the thermal LVT interrupt, + * leading to softlockups on machines which have configured SMI + * interrupt delivery. + */ + therm_lvt_init(); + mcheck_init(); register_refined_jiffies(CLOCK_TICK_RATE); |