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cpu/amd/car: Honor BKDG recommendations for DisFillP in CAR

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The recommendation to set DisFillP during CAR initialization
on K8 NPT CPUs was ignored.  The consequences of this are
largely unknown; fix up coreboot to follow the recommendations.

Change-Id: Ide512bbc1d9aa284179628e2aa598ef5475e8eeb
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/12249
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Timothy Pearson 2015-10-29 01:09:55 -05:00 committed by Ronald G. Minnich
parent 2caf3cbac0
commit e67d240444
1 changed files with 27 additions and 0 deletions
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27
src/cpu/amd/car/cache_as_ram.inc
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@ -34,6 +34,7 @@
#define MSR_MCFG_BASE 0xC0010058
#define MSR_FAM10 0xC001102A
#define jmp_if_not_k8(x) comisd %xmm2, %xmm1; jae x
#define jmp_if_k8(x) comisd %xmm2, %xmm1; jb x
#define CPUID_MASK 0x0ff00f00
@ -344,6 +345,19 @@ wbcache_post_fam10_setup:
andl $(~(CR0_CacheDisable | CR0_NoWriteThrough)), %eax
movl %eax, %cr0
jmp_if_not_k8(CAR_skip_k8_errata_part1)
/* Set DisFillP on BSP. */
movl $0x8000c068, %eax
movw $0xcf8, %dx
outl %eax, %dx
addw $4, %dx
inl %dx, %eax
bts $10, %eax
outl %eax, %dx
CAR_skip_k8_errata_part1:
jmp_if_k8(fam10_end_part1)
/* So we need to check if it is BSP. */
@ -367,6 +381,19 @@ fam10_end_part1:
xorl %eax, %eax
rep stosl
jmp_if_not_k8(CAR_skip_k8_errata_part2)
/* Clear DisFillP on BSP. */
movl $0x8000c068, %eax
movw $0xcf8, %dx
outl %eax, %dx
addw $4, %dx
inl %dx, %eax
btr $10, %eax
outl %eax, %dx
CAR_skip_k8_errata_part2:
/* Set up the stack pointer. */
movl $(CacheBase + CacheSize), %eax
movl %eax, %esp