Commit 7b00896a authored by Simon Glass's avatar Simon Glass
Browse files

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: default avatarSimon Glass <sjg@chromium.org>
parent db55bd7d
......@@ -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
......
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