x86: Add a CBMEM timestamp generated right before the kernel startup.

To maintain the initialization state of the timestamp facility, thesq
pointer to the CBMEM section containing the timestamp table should be
kept in the .data section (so that it is maintained across u-boot
relocation).

Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>

arch/x86/include/asm/arch-coreboot/timestamp.h

@@ -42,6 +42,7 @@ enum timestamp_id {
 
 	/* U-Boot entry IDs start at 1000 */
 	TS_U_BOOT_INITTED = 1000, /* This is where u-boot starts */
+	TS_U_BOOT_START_KERNEL = 1100, /* Right before jumping to kernel. */
 };
 
 void timestamp_init(void);

arch/x86/lib/zimage.c

@@ -36,6 +36,9 @@
 #include <asm/realmode.h>
 #include <asm/byteorder.h>
 #include <asm/bootparam.h>
+#ifdef CONFIG_SYS_COREBOOT
+#include <asm/arch/timestamp.h>
+#endif
 
 /*
  * Memory lay-out:
@@ -283,6 +286,9 @@ void boot_zimage(void *setup_base, void *load_address)
 {
 	printf("\nStarting kernel ...\n\n");
 
+#ifdef CONFIG_SYS_COREBOOT
+	timestamp_add_now(TS_U_BOOT_START_KERNEL);
+#endif
 #if defined CONFIG_ZBOOT_32
 	/*
 	 * Set %ebx, %ebp, and %edi to 0, %esi to point to the boot_params