diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/security/intel/txt/getsec_enteraccs.S | 95 |
1 files changed, 47 insertions, 48 deletions
diff --git a/src/security/intel/txt/getsec_enteraccs.S b/src/security/intel/txt/getsec_enteraccs.S index 0dd5237e7a..3135de79b2 100644 --- a/src/security/intel/txt/getsec_enteraccs.S +++ b/src/security/intel/txt/getsec_enteraccs.S @@ -27,46 +27,6 @@ wrmsr .endm -/* Variable MTRR index is passed through %ebx */ -.macro PUSH_VAR_MTRR - movl %ebx, %ecx - shll %ecx - addl MTRR_PHYS_BASE(0), %ecx - rdmsr - push %eax - push %edx - incl %ecx /* MTRR_PHYS_MASK */ - rdmsr - push %eax - push %edx -.endm - -.macro POP_VAR_MTRR - movl %ebx, %ecx - shll %ecx - addl MTRR_PHYS_MASK(0), %ecx - pop %edx - pop %eax - wrmsr - decl %ecx /* MTRR_PHYS_BASE */ - pop %edx - pop %eax - wrmsr -.endm - -.macro CLEAR_VAR_MTRR - movl %ebx, %ecx - shll %ecx - addl MTRR_PHYS_BASE(0), %ecx - xorl %edx, %edx - xorl %eax, %eax - wrmsr - incl %ecx /* MTRR_PHYS_MASK */ - xorl %edx, %edx - xorl %eax, %eax - wrmsr -.endm - .align 4 .text @@ -111,12 +71,23 @@ getsec_enteraccs: PUSH_MSR MTRR_FIX_4K_F8000 /* Push variable MTRRs in ascending order */ + xorl %ebx, %ebx jmp cond_push_var_mtrrs body_push_var_mtrrs: - PUSH_VAR_MTRR + movl %ebx, %ecx + shll %ecx + addl $(MTRR_PHYS_BASE(0)), %ecx + rdmsr + push %eax + push %edx + incl %ecx /* MTRR_PHYS_MASK */ + rdmsr + push %eax + push %edx + incl %ebx cond_push_var_mtrrs: @@ -125,7 +96,7 @@ cond_push_var_mtrrs: rdmsr andl $(0xff), %eax cmp %ebx, %eax - jge body_push_var_mtrrs + jg body_push_var_mtrrs /* * Disable cache. @@ -168,10 +139,24 @@ cond_push_var_mtrrs: andl $(0xff), %eax movl %eax, %ebx + xorl %eax, %eax + xorl %edx, %edx + + jmp cond_clear_var_mtrrs + body_clear_var_mtrrs: - CLEAR_VAR_MTRR decl %ebx + movl %ebx, %ecx + shll %ecx + addl $(MTRR_PHYS_BASE(0)), %ecx + wrmsr + incl %ecx /* MTRR_PHYS_MASK */ + wrmsr + +cond_clear_var_mtrrs: + + cmpl $0, %ebx jnz body_clear_var_mtrrs /* @@ -266,19 +251,33 @@ body_clear_var_mtrrs: orl $(CR0_CD | CR0_NW), %eax movl %eax, %cr0 - /* Restore MTTRs */ - /* Pop variable MTRRs in descending order */ + movl $(MTRR_CAP_MSR), %ecx rdmsr andl $(0xff), %eax movl %eax, %ebx + jmp cond_pop_var_mtrrs + body_pop_var_mtrrs: - POP_VAR_MTRR decl %ebx - jnz body_pop_var_mtrrs + movl %ebx, %ecx + shll %ecx + addl $(MTRR_PHYS_MASK(0)), %ecx + pop %edx + pop %eax + wrmsr + decl %ecx /* MTRR_PHYS_BASE */ + pop %edx + pop %eax + wrmsr + +cond_pop_var_mtrrs: + + cmpl $0, %ebx + jne body_pop_var_mtrrs POP_MSR MTRR_FIX_4K_F8000 POP_MSR MTRR_FIX_4K_F0000 @@ -301,7 +300,7 @@ body_pop_var_mtrrs: /* Enable cache */ movl %cr0, %eax andl $(~(CR0_CD | CR0_NW)), %eax - movl %eax, %cr0 + movl %eax, %cr0 /* Pop GDT */ addl $8, %esp |