summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--src/cpu/intel/model_6ex/cache_as_ram.inc12
1 files changed, 11 insertions, 1 deletions
diff --git a/src/cpu/intel/model_6ex/cache_as_ram.inc b/src/cpu/intel/model_6ex/cache_as_ram.inc
index 0906bc0e5f..02de5ab50f 100644
--- a/src/cpu/intel/model_6ex/cache_as_ram.inc
+++ b/src/cpu/intel/model_6ex/cache_as_ram.inc
@@ -201,7 +201,17 @@ clear_mtrrs:
xorl %edx, %edx
wrmsr
movl $MTRRphysMask_MSR(0), %ecx
- movl $(~(1024 * 1024 - 1) | MTRRphysMaskValid), %eax
+ movl $(~(CONFIG_RAMTOP - 1) | MTRRphysMaskValid), %eax
+ movl $0x0000000f, %edx // 36bit address space
+ wrmsr
+
+ /* Enable caching and Speculative Reads for the last 4MB. */
+ movl $MTRRphysBase_MSR(1), %ecx
+ movl $(0xffc00000 | MTRR_TYPE_WRPROT), %eax
+ xorl %edx, %edx
+ wrmsr
+ movl $MTRRphysMask_MSR(1), %ecx
+ movl $(~(4 * 1024 * 1024 - 1) | MTRRphysMaskValid), %eax
movl $0x0000000f, %edx // 36bit address space
wrmsr