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

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