[coreboot-gerrit] Change in coreboot[master]: cpu/intel/car/cache_as_ram_ht.inc: Allow setting non eviction mode

[Arthur Heymans (Code Review)]

Arthur Heymans has uploaded this change for review. ( https://review.coreboot.org/26706


Change subject: cpu/intel/car/cache_as_ram_ht.inc: Allow setting non eviction mode
......................................................................

cpu/intel/car/cache_as_ram_ht.inc: Allow setting non eviction mode

This is needed on CPU's from model_2065x on.

Change-Id: Iefd484a95fff8d1cb78b4dcf5b31df7086e4431f
Signed-off-by: Arthur Heymans <arthur at aheymans.xyz>
---
M src/cpu/intel/car/cache_as_ram_ht.inc
1 file changed, 34 insertions(+), 0 deletions(-)



  git pull ssh://review.coreboot.org:29418/coreboot refs/changes/06/26706/1

diff --git a/src/cpu/intel/car/cache_as_ram_ht.inc b/src/cpu/intel/car/cache_as_ram_ht.inc
index 0eb58d1..58dbf29 100644
--- a/src/cpu/intel/car/cache_as_ram_ht.inc
+++ b/src/cpu/intel/car/cache_as_ram_ht.inc
@@ -28,6 +28,8 @@
 #define CACHE_AS_RAM_SIZE CONFIG_DCACHE_RAM_SIZE
 #define CACHE_AS_RAM_BASE CONFIG_DCACHE_RAM_BASE
 
+#define NoEvictMod_MSR 0x2e0
+
 	/* Save the BIST result. */
 	movl	%eax, %ebp
 
@@ -299,6 +301,15 @@
 	invd
 	movl	%eax, %cr0
 
+#if IS_ENABLED(CONFIG_CPU_HAS_NO_EVICT_MODE)
+	/* enable the 'no eviction' mode */
+	movl    $NoEvictMod_MSR, %ecx
+	rdmsr
+	orl     $1, %eax
+	andl    $~2, %eax
+	wrmsr
+#endif
+
 	/* Clear the cache memory region. This will also fill up the cache. */
 	cld
 	xorl	%eax, %eax
@@ -306,6 +317,14 @@
 	movl	$(CACHE_AS_RAM_SIZE >> 2), %ecx
 	rep	stosl
 
+#if IS_ENABLED(CONFIG_CPU_HAS_NO_EVICT_MODE)
+	/* enable the 'no eviction run' state */
+	movl    $NoEvictMod_MSR, %ecx
+	rdmsr
+	orl     $3, %eax
+	wrmsr
+#endif
+
 	post_code(0x2d)
 	/* Enable Cache-as-RAM mode by disabling cache. */
 	movl	%cr0, %eax
@@ -370,8 +389,23 @@
 
 	post_code(0x32)
 
+#if IS_ENABLED(CONFIG_CPU_HAS_NO_EVICT_MODE)
+	/* Disable the no eviction run state */
+	movl    $NoEvictMod_MSR, %ecx
+	rdmsr
+	andl    $~2, %eax
+	wrmsr
+#endif
+
 	invd
 
+#if IS_ENABLED(CONFIG_CPU_HAS_NO_EVICT_MODE)
+	/* Disable the no eviction mode */
+	rdmsr
+	andl    $~1, %eax
+	wrmsr
+#endif
+
 	post_code(0x33)
 
 	/* Enable cache. */

-- 
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Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: Iefd484a95fff8d1cb78b4dcf5b31df7086e4431f
Gerrit-Change-Number: 26706
Gerrit-PatchSet: 1
Gerrit-Owner: Arthur Heymans <arthur at aheymans.xyz>
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