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 
---
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. */