diff options
Diffstat (limited to 'src/arch/x86/exit_car.S')
| -rw-r--r-- | src/arch/x86/exit_car.S | 53 |
1 files changed, 44 insertions, 9 deletions
diff --git a/src/arch/x86/exit_car.S b/src/arch/x86/exit_car.S index a921ee5d7d..806dc9c069 100644 --- a/src/arch/x86/exit_car.S +++ b/src/arch/x86/exit_car.S @@ -10,6 +10,30 @@ post_car_stack_top: .long 0 .long 0 +#if defined(__x86_64__) +.code64 +.macro pop_eax_edx + pop %rax + mov %rax, %rdx + shr $32, %rdx +.endm +.macro pop_ebx_esi + pop %rbx + mov %rbx, %rsi + shr $32, %rsi +.endm +#else +.code32 +.macro pop_eax_edx + pop %eax + pop %edx +.endm +.macro pop_ebx_esi + pop %ebx + pop %esi +.endm +#endif + .text .global _start _start: @@ -17,7 +41,11 @@ _start: is expected to be implemented in assembly. */ /* Migrate GDT to this text segment */ +#if defined(__x86_64__) + call gdt_init64 +#else call gdt_init +#endif #ifdef __x86_64__ mov %rdi, _cbmem_top_ptr @@ -31,10 +59,15 @@ _start: call chipset_teardown_car /* Enable caching if not already enabled. */ +#ifdef __x86_64__ + mov %cr0, %rax + and $(~(CR0_CD | CR0_NW)), %eax + mov %rax, %cr0 +#else mov %cr0, %eax and $(~(CR0_CD | CR0_NW)), %eax mov %eax, %cr0 - +#endif /* Ensure cache is clean. */ invd @@ -61,8 +94,13 @@ _start: /* Need to align stack to 16 bytes at the call instruction. Therefore account for the 1 push. */ andl $0xfffffff0, %esp +#if defined(__x86_64__) + mov %rbp, %rdi +#else sub $12, %esp push %ebp +#endif + call soc_set_mtrrs /* Ignore fixing up %esp since we're setting it a new value. */ @@ -73,7 +111,7 @@ _start: call soc_enable_mtrrs #else /* CONFIG_SOC_SETS_MSRS */ /* Clear variable MTRRs. */ - pop %ebx /* Number to clear */ + pop_ebx_esi /* ebx: Number to clear, esi: Number to set */ test %ebx, %ebx jz 2f xor %eax, %eax @@ -89,23 +127,20 @@ _start: 2: /* Set Variable MTRRs based on stack contents. */ - pop %ebx /* Number to set. */ - test %ebx, %ebx + test %esi, %esi jz 2f mov $(MTRR_PHYS_BASE(0)), %ecx 1: /* Write MTRR base. */ - pop %eax - pop %edx + pop_eax_edx wrmsr inc %ecx /* Write MTRR mask. */ - pop %eax - pop %edx + pop_eax_edx wrmsr inc %ecx - dec %ebx + dec %esi jnz 1b 2: |