diff options
Diffstat (limited to 'arch/x86/kernel/realmode.c')
| -rw-r--r-- | arch/x86/kernel/realmode.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/realmode.c b/arch/x86/kernel/realmode.c index 712fba8fd7743..66ac276cf361e 100644 --- a/arch/x86/kernel/realmode.c +++ b/arch/x86/kernel/realmode.c @@ -6,6 +6,7 @@ #include <asm/realmode.h> struct real_mode_header *real_mode_header; +u32 *trampoline_cr4_features; void __init setup_real_mode(void) { @@ -64,7 +65,14 @@ void __init setup_real_mode(void) trampoline_header->gdt_limit = __BOOT_DS + 7; trampoline_header->gdt_base = __pa(boot_gdt); #else + if (rdmsr_safe(MSR_EFER, &trampoline_header->efer_low, + &trampoline_header->efer_high)) + BUG(); + trampoline_header->start = (u64) secondary_startup_64; + trampoline_cr4_features = &trampoline_header->cr4; + *trampoline_cr4_features = read_cr4(); + trampoline_pgd = (u64 *) __va(real_mode_header->trampoline_pgd); trampoline_pgd[0] = __pa(level3_ident_pgt) + _KERNPG_TABLE; trampoline_pgd[511] = __pa(level3_kernel_pgt) + _KERNPG_TABLE; |