CAR patch from YH LU

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2096 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 46 insertions, 0 deletions

diff --git a/src/cpu/amd/car/disable_cache_as_ram.c b/src/cpu/amd/car/disable_cache_as_ram.c
new file mode 100644
index 0000000000..a699cae99b
--- /dev/null
+++ b/src/cpu/amd/car/disable_cache_as_ram.c
@@ -0,0 +1,46 @@
+/* by yhlu 6.2005 */
+/* be warned, this file will be used other cores and core 0 / node 0 */
+        __asm__ volatile (
+	/* 
+	FIXME : backup stack in CACHE_AS_RAM into mmx and sse and after we get STACK up, we restore that.
+		It is only needed if we want to go back
+	*/
+	
+        /* We don't need cache as ram for now on */
+        /* disable cache */
+        "movl    %cr0, %eax\n\t"
+        "orl    $(0x1<<30),%eax\n\t"
+        "movl    %eax, %cr0\n\t"
+
+        /* clear sth */
+        "movl    $0x269, %ecx\n\t"  /* fix4k_c8000*/
+        "xorl    %edx, %edx\n\t"
+        "xorl    %eax, %eax\n\t"
+	"wrmsr\n\t"
+#if DCACHE_RAM_SIZE > 0x8000
+	"movl    $0x268, %ecx\n\t"  /* fix4k_c0000*/
+        "wrmsr\n\t"
+#endif
+
+        /* disable fixed mtrr from now on, it will be enabled by linuxbios_ram again*/
+        "movl    $0xC0010010, %ecx\n\t"
+//        "movl    $SYSCFG_MSR, %ecx\n\t"
+        "rdmsr\n\t"
+        "andl    $(~(3<<18)), %eax\n\t"
+//        "andl    $(~(SYSCFG_MSR_MtrrFixDramModEn | SYSCFG_MSR_MtrrFixDramEn)), %eax\n\t"
+        "wrmsr\n\t"
+
+        /* Set the default memory type and disable fixed and enable variable MTRRs */
+        "movl    $0x2ff, %ecx\n\t"
+//        "movl    $MTRRdefType_MSR, %ecx\n\t"
+        "xorl    %edx, %edx\n\t"
+        /* Enable Variable and Disable Fixed MTRRs */
+        "movl    $0x00000800, %eax\n\t"
+        "wrmsr\n\t"
+
+        /* enable cache */
+        "movl    %cr0, %eax\n\t"
+        "andl    $0x9fffffff,%eax\n\t"
+        "movl    %eax, %cr0\n\t"
+
+        );