diff options
Diffstat (limited to 'src/security/intel/txt/getsec_mtrr_setup.inc')
| -rw-r--r-- | src/security/intel/txt/getsec_mtrr_setup.inc | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/src/security/intel/txt/getsec_mtrr_setup.inc b/src/security/intel/txt/getsec_mtrr_setup.inc index 15e8cc17ad..44471ebea8 100644 --- a/src/security/intel/txt/getsec_mtrr_setup.inc +++ b/src/security/intel/txt/getsec_mtrr_setup.inc @@ -3,8 +3,6 @@ #include <cpu/x86/mtrr.h> #include <cpu/x86/msr.h> -#define MTRR_HIGH_MASK $((1 << (CONFIG_CPU_ADDR_BITS - 32)) - 1) - /* * Configure the MTRRs to cache the BIOS ACM. No general-purpose * registers are preserved. Inputs are taken from SSE registers: @@ -16,6 +14,16 @@ */ .macro SET_UP_MTRRS_FOR_BIOS_ACM + /* Determine CPU_ADDR_BITS and load PHYSMASK high word to %edx. */ + movl $0x80000008, %eax + cpuid + movb %al, %cl + sub $32, %cl + movl $1, %edx + shl %cl, %edx + subl $1, %edx + movl %edx, %edi /* %edi contains the MTRR_HIGH_MASK */ + /* Get the number of variable MTRRs */ movl $(MTRR_CAP_MSR), %ecx rdmsr @@ -56,7 +64,7 @@ body_allocate_var_mtrrs: movd %eax, %xmm1 /* Program MTRR mask */ - movl MTRR_HIGH_MASK, %edx + movl %edi, %edx xorl %eax, %eax subl %ebx, %eax /* %eax = 4GIB - size to cache */ orl $(MTRR_PHYS_MASK_VALID), %eax |