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-rw-r--r--src/security/intel/txt/getsec_enteraccs.S95
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