From d4c47470f0681eff1903faffa06173bb0795a24f Mon Sep 17 00:00:00 2001
From: "Ronald G. Minnich" <rminnich@gmail.com>
Date: Fri, 23 Feb 2007 09:28:16 +0000
Subject: [PATCH] Add the CAR disable code. It MUST be inline. Rather than a
 crufty include, we just put it here.

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Acked-by: Ronald G. Minnich <rminnich@gmail.com>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@84 f3766cd6-281f-0410-b1cd-43a5c92072e9
---
 arch/x86/cachemain.c | 90 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)

diff --git a/arch/x86/cachemain.c b/arch/x86/cachemain.c
index e1731aa713..1449697831 100644
--- a/arch/x86/cachemain.c
+++ b/arch/x86/cachemain.c
@@ -109,6 +109,96 @@ printk(BIOS_INFO, "Start search at 0x%x, size %d\n", archive.start, archive.len)
 		die("Failed ram init code\n");
 
 	printk(BIOS_INFO, "Done ram init code\n");
+	/* this is nasty. And, it has to be done this way. Sorry! */
+	/* we have to turn off CAR, and do some other things, and it has to be done
+	 * inline -- you can't call a function
+	 */
+
+        __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
+
+        /* 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"
+
+#if defined(CLEAR_FIRST_1M_RAM)
+        /* enable caching for first 1M using variable mtrr */
+        "movl    $0x200, %ecx\n\t"
+        "xorl    %edx, %edx\n\t"
+        "movl     $(0 | 1), %eax\n\t"
+//	"movl     $(0 | MTRR_TYPE_WRCOMB), %eax\n\t"
+        "wrmsr\n\t"
+
+        "movl    $0x201, %ecx\n\t"
+        "movl    $0x0000000f, %edx\n\t" /* AMD 40 bit 0xff*/
+        "movl    $((~(( 0 + 0x100000) - 1)) | 0x800), %eax\n\t"
+        "wrmsr\n\t"
+#endif
+
+        /* enable cache */
+        "movl    %cr0, %eax\n\t"
+        "andl    $0x9fffffff,%eax\n\t"
+        "movl    %eax, %cr0\n\t"
+#if defined(CLEAR_FIRST_1M_RAM)
+        /* clear the first 1M */
+        "movl    $0x0, %edi\n\t"
+        "cld\n\t"
+        "movl    $(0x100000>>2), %ecx\n\t"
+        "xorl    %eax, %eax\n\t"
+        "rep     stosl\n\t"
+
+        /* disable cache */
+        "movl    %cr0, %eax\n\t"
+        "orl    $(0x1<<30),%eax\n\t"
+        "movl    %eax, %cr0\n\t"
+
+        /* enable caching for first 1M using variable mtrr */
+        "movl    $0x200, %ecx\n\t"
+        "xorl    %edx, %edx\n\t"
+        "movl     $(0 | 6), %eax\n\t"
+//	"movl     $(0 | MTRR_TYPE_WRBACK), %eax\n\t"
+        "wrmsr\n\t"
+
+        "movl    $0x201, %ecx\n\t"
+        "movl    $0x0000000f, %edx\n\t" /* AMD 40 bit 0xff*/
+        "movl    $((~(( 0 + 0x100000) - 1)) | 0x800), %eax\n\t"
+        "wrmsr\n\t"
+
+        /* enable cache */
+        "movl    %cr0, %eax\n\t"
+        "andl    $0x9fffffff,%eax\n\t"
+        "movl    %eax, %cr0\n\t"
+	"invd\n\t"
+
+	/* 
+	FIXME: I hope we don't need to change esp and ebp value here, so we can restore value from mmx sse back
+		But the problem is the range is some io related, So don't go back
+	*/
+#endif
+        );
 
 	ret = run_file(&archive, "normal/stage2", (void *)0x1000);
 	if (ret)