[coreboot] r945 - in coreboot-v3: arch/x86 arch/x86/via include/arch/x86

[svn at coreboot.org]

Author: hailfinger
Date: 2008-10-23 02:28:28 +0200 (Thu, 23 Oct 2008)
New Revision: 945

Added:
   coreboot-v3/arch/x86/via/stage1.c
Modified:
   coreboot-v3/arch/x86/Makefile
   coreboot-v3/include/arch/x86/via_c7.h
Log:
This is the patch which will let VIA C7 continue in v3 during/after a
CAR disabling operation. Untested, but it should work.

Please note that the code is incomplete, but that should at least not
affect stage2.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006 at gmx.net>
Acked-by: Ronald G. Minnich <rminnich at gmail.com>


Modified: coreboot-v3/arch/x86/Makefile
===================================================================
--- coreboot-v3/arch/x86/Makefile	2008-10-22 19:18:04 UTC (rev 944)
+++ coreboot-v3/arch/x86/Makefile	2008-10-23 00:28:28 UTC (rev 945)
@@ -125,6 +125,7 @@
 else
 ifeq ($(CONFIG_CPU_VIA_C7),y)
 	STAGE0_CAR_OBJ = via/stage0.o
+	STAGE0_ARCH_X86_SRC += via/stage1.c
 endif
 endif
 endif

Added: coreboot-v3/arch/x86/via/stage1.c
===================================================================
--- coreboot-v3/arch/x86/via/stage1.c	                        (rev 0)
+++ coreboot-v3/arch/x86/via/stage1.c	2008-10-23 00:28:28 UTC (rev 945)
@@ -0,0 +1,105 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008 Carl-Daniel Hailfinger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include <types.h>
+#include <lib.h>
+#include <console.h>
+#include <msr.h>
+#include <macros.h>
+#include <cpu.h>
+#include <stage1.h>
+#include <globalvars.h>
+#include <string.h>
+#include <mtrr.h>
+#include <via_c7.h>
+
+#ifdef NO_IDEA_WHETHER_THIS_IS_RELEVANT_ON_C7
+/**
+ * Set the MTRR for initial ram access. 
+ * be warned, this will be used by core other than core 0/node 0 or core0/node0 when cpu_reset. 
+ * This warning has some significance I don't yet understand. 
+ */
+void set_init_ram_access(void)
+{
+	set_var_mtrr(0, 0x00000000, CONFIG_CBMEMK << 10, MTRR_TYPE_WRBACK);
+}
+#endif
+
+#define __stringify_1(x)	#x
+#define __stringify(x)		__stringify_1(x)
+
+/**
+ * Disable Cache As RAM (CAR) after memory is setup.
+ */
+void disable_car(void)
+{
+	/* Determine new global variable location. Stack organization from top
+	 * Top 4 bytes are reserved
+	 * Pointer to global variables
+	 * Global variables
+	 *
+ 	 * Align the result to 8 bytes
+	 */
+	const struct global_vars *newlocation = (struct global_vars *)((RAM_STACK_BASE - sizeof(struct global_vars *) - sizeof(struct global_vars)) & ~0x7);
+	/* Copy global variables to new location. */
+	memcpy(newlocation, global_vars(), sizeof(struct global_vars));
+	/* Set the new global variable pointer. */
+	*(struct global_vars **)(RAM_STACK_BASE - sizeof(struct global_vars *)) = newlocation;
+
+	__asm__ __volatile__(
+	/* We don't need cache as ram for now on */
+	/* disable cache */
+	"	movl    %%cr0, %%eax		\n"
+	"	orl    $(0x1<<30),%%eax		\n"
+	"	movl    %%eax, %%cr0		\n"
+
+	/* disable fixed mtrr from now on, it will be enabled by coreboot_ram again*/
+	"	movl    %[_SYSCFG_MSR], %%ecx	\n"
+	"	rdmsr				\n"
+	"	andl    %[_SYSCFG_MSR_newval], %%eax\n"
+//	"	andl    $(~(SYSCFG_MSR_MtrrFixDramModEn | SYSCFG_MSR_MtrrFixDramEn)), %%eax\n"
+	/* clear sth */
+	"	wrmsr				\n"
+#warning Must clear MTRR 0x200 and 0x201
+
+	/* Set the default memory type and disable fixed and enable variable MTRRs */
+	"	movl    %[_MTRRdefType_MSR], %%ecx	\n"
+	"	xorl    %%edx, %%edx		\n"
+	/* Enable Variable and Disable Fixed MTRRs */
+	"	movl    $0x00000800, %%eax	\n"
+	"	wrmsr				\n"
+
+	/* enable cache */
+	"	movl    %%cr0, %%eax		\n"
+	"	andl    $0x9fffffff,%%eax	\n"
+	"	movl    %%eax, %%cr0		\n"
+
+	"	wbinvd				\n"
+
+	"	movl	%[newesp], %%esp	\n"
+	"	call stage1_phase3		\n"
+	:: [newesp] "i" (newlocation),
+	 [_SYSCFG_MSR] "i" (SYSCFG_MSR),
+	 [_SYSCFG_MSR_newval] "i" (~(SYSCFG_MSR_MtrrFixDramModEn | SYSCFG_MSR_MtrrFixDramEn)),
+	 [_SYSCFG_MSR_MtrrFixDramModEn] "i" (SYSCFG_MSR_MtrrFixDramModEn),
+	 [_SYSCFG_MSR_MtrrFixDramEn] "i" (SYSCFG_MSR_MtrrFixDramEn),
+	 [_MTRRdefType_MSR] "i" (MTRRdefType_MSR)
+	: "memory");
+}

Modified: coreboot-v3/include/arch/x86/via_c7.h
===================================================================
--- coreboot-v3/include/arch/x86/via_c7.h	2008-10-22 19:18:04 UTC (rev 944)
+++ coreboot-v3/include/arch/x86/via_c7.h	2008-10-23 00:28:28 UTC (rev 945)
@@ -22,6 +22,10 @@
 #define CPU_VIA_C7_H
 
 
+#define SYSCFG_MSR			0xC0010010
+#define SYSCFG_MSR_MtrrFixDramModEn	(1 << 19)
+#define SYSCFG_MSR_MtrrFixDramEn	(1 << 18)
+
 #ifndef __ASSEMBLER__
 
 /* This is new.