3 files changed, 38 insertions, 1 deletions

diff --git a/arch/x86/cpu/coreboot/coreboot.c b/arch/x86/cpu/coreboot/coreboot.c
index 8501716..0760a61 100644
--- a/arch/x86/cpu/coreboot/coreboot.c
+++ b/arch/x86/cpu/coreboot/coreboot.c
@@ -15,6 +15,7 @@
 #include <asm/cache.h>
 #include <asm/cpu.h>
 #include <asm/io.h>
+#include <asm/post.h>
 #include <asm/arch-coreboot/tables.h>
 #include <asm/arch-coreboot/sysinfo.h>
 #include <asm/arch/timestamp.h>
@@ -70,7 +71,7 @@ void show_boot_progress(int val)
 		gd->arch.tsc_prev = now;
 	}
 #endif
-	outb(val, 0x80);
+	outb(val, POST_PORT);
 }
 
 int print_cpuinfo(void)
diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index b18f320..1b738f9 100644
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -13,6 +13,7 @@
 #include <config.h>
 #include <version.h>
 #include <asm/global_data.h>
+#include <asm/post.h>
 #include <asm/processor.h>
 #include <asm/processor-flags.h>
 #include <generated/generic-asm-offsets.h>
@@ -67,6 +68,7 @@ _start:
 	jmp	early_board_init
 .globl early_board_init_ret
 early_board_init_ret:
+	post_code(POST_START)
 
 	/* Initialise Cache-As-RAM */
 	jmp	car_init
@@ -96,6 +98,7 @@ car_init_ret:
 
 	/* Align global data to 16-byte boundary */
 	andl	$0xfffffff0, %esp
+	post_code(POST_START_STACK)
 
 	/* Zero the global data since it won't happen later */
 	xorl	%eax, %eax
@@ -131,6 +134,7 @@ car_init_ret:
 	call	setup_gdt
 
 	/* Set parameter to board_init_f() to boot flags */
+	post_code(POST_START_DONE)
 	xorl	%eax, %eax
 
 	/* Enter, U-boot! */
diff --git a/arch/x86/include/asm/post.h b/arch/x86/include/asm/post.h
new file mode 100644
index 0000000..3371185
--- /dev/null
+++ b/arch/x86/include/asm/post.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _post_h
+#define _post_h
+
+/* port to use for post codes */
+#define POST_PORT		0x80
+
+/* post codes which represent various stages of init */
+#define POST_START		0x1e
+#define POST_CAR_START		0x1f
+
+#define POST_START_STACK	0x29
+#define POST_START_DONE		0x2a
+
+/* Output a post code using al - value must be 0 to 0xff */
+#ifdef __ASSEMBLY__
+#define post_code(value) \
+	movb	$value, %al; \
+	outb	%al, $POST_PORT
+#else
+static inline void post_code(int code)
+{
+	outb(code, POST_PORT);
+}
+#endif
+
+#endif