diff options
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/trampoline_64.S | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/arch/x86/kernel/trampoline_64.S b/arch/x86/kernel/trampoline_64.S index 894293c598d..95a012a4664 100644 --- a/arch/x86/kernel/trampoline_64.S +++ b/arch/x86/kernel/trampoline_64.S @@ -29,6 +29,7 @@ #include <asm/page.h> #include <asm/msr.h> #include <asm/segment.h> +#include <asm/processor-flags.h> .section .rodata, "a", @progbits @@ -37,7 +38,7 @@ ENTRY(trampoline_data) r_base = . cli # We should be safe anyway - wbinvd + wbinvd mov %cs, %ax # Code and data in the same place mov %ax, %ds mov %ax, %es @@ -73,9 +74,8 @@ r_base = . lidtl tidt - r_base # load idt with 0, 0 lgdtl tgdt - r_base # load gdt with whatever is appropriate - xor %ax, %ax - inc %ax # protected mode (PE) bit - lmsw %ax # into protected mode + mov $X86_CR0_PE, %ax # protected mode (PE) bit + lmsw %ax # into protected mode # flush prefetch and jump to startup_32 ljmpl *(startup_32_vector - r_base) @@ -86,9 +86,8 @@ startup_32: movl $__KERNEL_DS, %eax # Initialize the %ds segment register movl %eax, %ds - xorl %eax, %eax - btsl $5, %eax # Enable PAE mode - movl %eax, %cr4 + movl $X86_CR4_PAE, %eax + movl %eax, %cr4 # Enable PAE mode # Setup trampoline 4 level pagetables leal (trampoline_level4_pgt - r_base)(%esi), %eax @@ -99,9 +98,9 @@ startup_32: xorl %edx, %edx wrmsr - xorl %eax, %eax - btsl $31, %eax # Enable paging and in turn activate Long Mode - btsl $0, %eax # Enable protected mode + # Enable paging and in turn activate Long Mode + # Enable protected mode + movl $(X86_CR0_PG | X86_CR0_PE), %eax movl %eax, %cr0 /* |