Move cmos.default handling to bootblock

The cmos.default code wasn't actually used so far, due to an oversight
when forward-porting this feature from an old branch.

- Extend walkcbfs' use by factoring out the stage handling into C code.
- New sanitize_cmos() function that looks if CMOS data is invalid and
  cmos.default exists and if so overwrites CMOS with cmos.default data.
- Use sanitize_cmos() in both bootblock implementations.
- Drop the need to reboot after writing CMOS: CMOS wasn't used so far,
  so we can go on without a reboot.
- Remove the restriction that cmos.default only works on CAR boards.
- Always build in cmos.default support on boards that
  USE_OPTION_TABLE.

Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Acked-by: Stefan Reinauer <stefan.reinauer@coreboot.org>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6436 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

6 files changed, 42 insertions, 19 deletions

diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig
index 3684c69e27..aacc0982a6 100644
--- a/src/arch/x86/Kconfig
+++ b/src/arch/x86/Kconfig
@@ -91,14 +91,8 @@ config PC80_SYSTEM
 config BOOTBLOCK_NORTHBRIDGE_INIT
 	string
 
-config USE_CMOS_RECOVERY
-	bool
-	default n if ROMCC
-	default y
-
 config HAVE_CMOS_DEFAULT
 	def_bool n
-	depends on USE_CMOS_RECOVERY
 
 config CMOS_DEFAULT_FILE
 	string
diff --git a/src/arch/x86/Makefile.bootblock.inc b/src/arch/x86/Makefile.bootblock.inc
index 31db224915..4958a77cb7 100644
--- a/src/arch/x86/Makefile.bootblock.inc
+++ b/src/arch/x86/Makefile.bootblock.inc
@@ -57,7 +57,7 @@ $(obj)/mainboard/$(MAINBOARDDIR)/bootblock.s: $(obj)/bootblock/bootblock.S
 	@printf "    CC         $(subst $(obj)/,,$(@))\n"
 	$(CC) -MMD -DASSEMBLY -E -I$(src)/include -I$(src)/arch/x86/include -I$(obj) -I$(obj)/bootblock -include $(obj)/config.h -I. -I$(src) $< -o $@
 
-$(obj)/mainboard/$(MAINBOARDDIR)/bootblock.inc: $(src)/arch/x86/init/$(subst ",,$(CONFIG_BOOTBLOCK_SOURCE)) $(objutil)/romcc/romcc
+$(obj)/mainboard/$(MAINBOARDDIR)/bootblock.inc: $(src)/arch/x86/init/$(subst ",,$(CONFIG_BOOTBLOCK_SOURCE)) $(objutil)/romcc/romcc $(OPTION_TABLE_H)
 	@printf "    ROMCC      $(subst $(obj)/,,$(@))\n"
 	$(CC) -MM -MT$(obj)/mainboard/$(MAINBOARDDIR)/bootblock.inc \
 		$< > $(obj)/mainboard/$(MAINBOARDDIR)/bootblock.inc.d
diff --git a/src/arch/x86/include/bootblock_common.h b/src/arch/x86/include/bootblock_common.h
index 895a185c6f..a808cec7a5 100644
--- a/src/arch/x86/include/bootblock_common.h
+++ b/src/arch/x86/include/bootblock_common.h
@@ -17,17 +17,45 @@ static void bootblock_northbridge_init(void) { }
 static void bootblock_southbridge_init(void) { }
 #endif
 
-static unsigned long findstage(char* target)
+static void *walkcbfs(char *target)
 {
-	unsigned long entry;
+	void *entry;
 	asm volatile (
 		"mov $1f, %%esp\n\t"
-		"jmp walkcbfs\n\t"
+		"jmp walkcbfs_asm\n\t"
 		"1:\n\t" : "=a" (entry) : "S" (target) : "ebx", "ecx", "edi", "esp");
 	return entry;
 }
 
+/* just enough to support findstage. copied because the original version doesn't easily pass through romcc */
+struct cbfs_stage {
+	unsigned long compression;
+	unsigned long entry; // this is really 64bit, but properly endianized
+};
+
+static unsigned long findstage(char* target)
+{
+	return ((struct cbfs_stage*)walkcbfs(target))->entry;
+}
+
 static void call(unsigned long addr, unsigned long bist)
 {
 	asm volatile ("jmp *%0\n\t" : : "r" (addr), "a" (bist));
 }
+
+#if CONFIG_USE_OPTION_TABLE
+#include <pc80/mc146818rtc.h>
+
+static void sanitize_cmos(void)
+{
+	if (cmos_error() || !cmos_chksum_valid()) {
+		unsigned char *cmos_default = (unsigned char*)walkcbfs("cmos.default");
+		if (cmos_default) {
+			int i;
+			for (i = 14; i < 128; i++) {
+				cmos_write(cmos_default[i], i);
+			}
+		}
+	}
+}
+#endif
diff --git a/src/arch/x86/init/bootblock_normal.c b/src/arch/x86/init/bootblock_normal.c
index 08651c32bb..99551484aa 100644
--- a/src/arch/x86/init/bootblock_normal.c
+++ b/src/arch/x86/init/bootblock_normal.c
@@ -8,6 +8,10 @@ static void main(unsigned long bist)
 		bootblock_southbridge_init();
 	}
 
+#if CONFIG_USE_OPTION_TABLE
+	sanitize_cmos();
+#endif
+
 	unsigned long entry;
 	if (do_normal_boot())
 		entry = findstage("normal/romstage");
diff --git a/src/arch/x86/init/bootblock_simple.c b/src/arch/x86/init/bootblock_simple.c
index e8994ee092..3887b97c58 100644
--- a/src/arch/x86/init/bootblock_simple.c
+++ b/src/arch/x86/init/bootblock_simple.c
@@ -6,6 +6,11 @@ static void main(unsigned long bist)
 		bootblock_northbridge_init();
 		bootblock_southbridge_init();
 	}
+
+#if CONFIG_USE_OPTION_TABLE
+	sanitize_cmos();
+#endif
+
 	const char* target1 = "fallback/romstage";
 	unsigned long entry;
 	entry = findstage(target1);
diff --git a/src/arch/x86/lib/walkcbfs.S b/src/arch/x86/lib/walkcbfs.S
index 395c46e20c..27d82ae742 100644
--- a/src/arch/x86/lib/walkcbfs.S
+++ b/src/arch/x86/lib/walkcbfs.S
@@ -15,19 +15,13 @@
 
 #define CBFS_FILE_STRUCTSIZE (CBFS_FILE_OFFSET + 4)
 
-#define CBFS_STAGE_COMPRESSION 0
-#define CBFS_STAGE_ENTRY (CBFS_STAGE_COMPRESSION + 4)
-#define CBFS_STAGE_LOAD (CBFS_STAGE_ENTRY + 8)
-#define CBFS_STAGE_LEN (CBFS_STAGE_LOAD + 8)
-#define CBFS_STAGE_MEMLEN (CBFS_STAGE_LEN + 4)
-
 /*
   input %esi: filename
   input %esp: return address (not pointer to return address!)
   output %eax: entry point
   clobbers %ebx, %ecx, %edi
 */
-walkcbfs:
+walkcbfs_asm:
 	cld
 
 	mov CBFS_HEADER_PTR, %eax
@@ -67,8 +61,6 @@ walker:
 	mov CBFS_FILE_OFFSET(%ebx), %eax
 	bswap %eax
 	add %ebx, %eax
-	add $CBFS_STAGE_ENTRY, %eax /* eax = ((cbfs_stage* (cbfs_file* ebx)->offset)->entry) */
-	mov 0(%eax), %eax
 	jmp *%esp
 
 tryharder: