diff options
| author | Simon Glass <sjg@chromium.org> | 2015-01-01 16:18:12 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-01-13 07:25:01 -0800 |
| commit | 7b00896ade7ee93504b5e5782bebe680705de1f6 (patch) | |
| tree | 56351c3b4734b3fdd5441dd07e9a21f479d6ef55 /arch/x86 | |
| parent | db55bd7dad9a2c30c8da884bf20273945e240430 (diff) | |
x86: ivybridge: Add a way to turn off the CAR
Cache-as-RAM should be turned off when we relocate since we want to run from
RAM. Add a function to perform this task.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/cpu/ivybridge/car.S | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/x86/cpu/ivybridge/car.S b/arch/x86/cpu/ivybridge/car.S index 72b22ea9e4..d5f1acfe3d 100644 --- a/arch/x86/cpu/ivybridge/car.S +++ b/arch/x86/cpu/ivybridge/car.S @@ -163,6 +163,52 @@ wait_for_sipi: /* return */ jmp car_init_ret +.globl car_uninit +car_uninit: + /* Disable cache */ + movl %cr0, %eax + orl $X86_CR0_CD, %eax + movl %eax, %cr0 + + /* Disable MTRRs */ + movl $MTRR_DEF_TYPE_MSR, %ecx + rdmsr + andl $(~MTRR_DEF_TYPE_EN), %eax + wrmsr + + /* Disable the no-eviction run state */ + movl NOEVICTMOD_MSR, %ecx + rdmsr + andl $~2, %eax + wrmsr + + invd + + /* Disable the no-eviction mode */ + rdmsr + andl $~1, %eax + wrmsr + +#ifdef CONFIG_CACHE_MRC_BIN + /* Clear the MTRR that was used to cache MRC */ + xorl %eax, %eax + xorl %edx, %edx + movl $MTRR_PHYS_BASE_MSR(2), %ecx + wrmsr + movl $MTRR_PHYS_MASK_MSR(2), %ecx + wrmsr +#endif + + /* Enable MTRRs */ + movl $MTRR_DEF_TYPE_MSR, %ecx + rdmsr + orl $MTRR_DEF_TYPE_EN, %eax + wrmsr + + invd + + ret + mtrr_table: /* Fixed MTRRs */ .word 0x250, 0x258, 0x259 |