[coreboot-gerrit] New patch to review for coreboot: cpu/amd/car: Honor BKDG recommendations for DisFillP in CAR
Timothy Pearson (tpearson@raptorengineeringinc.com)
gerrit at coreboot.org
Thu Oct 29 07:11:32 CET 2015
Timothy Pearson (tpearson at raptorengineeringinc.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/12249
-gerrit
commit 5be91e769f819f7e5e47e3e4e0c254bb5ced738f
Author: Timothy Pearson <tpearson at raptorengineeringinc.com>
Date: Thu Oct 29 01:09:55 2015 -0500
cpu/amd/car: Honor BKDG recommendations for DisFillP in CAR
Change-Id: Ide512bbc1d9aa284179628e2aa598ef5475e8eeb
Signed-off-by: Timothy Pearson <tpearson at raptorengineeringinc.com>
---
src/cpu/amd/car/cache_as_ram.inc | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/src/cpu/amd/car/cache_as_ram.inc b/src/cpu/amd/car/cache_as_ram.inc
index 0b2bc60..2a33dc1 100644
--- a/src/cpu/amd/car/cache_as_ram.inc
+++ b/src/cpu/amd/car/cache_as_ram.inc
@@ -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
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