From e17ee157ca9ff0d4cc5841d06c4b70c1603df29c Mon Sep 17 00:00:00 2001
From: Graeme Russ <graeme.russ@gmail.com>
Date: Tue, 24 Feb 2009 21:14:56 +1100
Subject: Add basic relocation to i386 port

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
---
 cpu/i386/start.S | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'cpu/i386/start.S')

diff --git a/cpu/i386/start.S b/cpu/i386/start.S
index b6175b1..59089ef 100644
--- a/cpu/i386/start.S
+++ b/cpu/i386/start.S
@@ -173,7 +173,41 @@ bss_fail:
 	jmp	die
 
 bss_ok:
+#ifndef CONFIG_SKIP_RELOCATE_UBOOT
+	/* indicate progress */
+	movw	$0x06, %ax
+	movl	$.progress6, %ebp
+	jmp	show_boot_progress_asm
+.progress6:
+
+	/* copy text section to ram, size must be 4-byte aligned */
+	movl	$CONFIG_SYS_BL_START_RAM, %edi		/* destination address */
+	movl	$TEXT_BASE, %esi		/* source address */
+	movl	$_i386boot_text_size, %ecx	/* number of bytes to copy */
+	movl	%ecx, %eax
+	andl	$3, %eax
+	jz	text_copy			/* Already 4-byte aligned */
+	subl    $4, %eax			/* Add extra bytes to size */
+	addl	%eax, %ecx
+text_copy:
+	shrl	$2, %ecx			/* copy 4 byte each time */
+	cld
+	cmpl	$0, %ecx
+	je	text_ok
+text_segment:
+	movsl
+	loop	text_segment
+	jmp	text_ok
+text_fail:
+	/* indicate (lack of) progress */
+	movw	$0x86, %ax
+	movl	$.progress5a, %ebp
+	jmp	show_boot_progress_asm
+.progress5a:
+	jmp	die
 
+text_ok:
+#endif
 	wbinvd
 
 
@@ -183,7 +217,14 @@ bss_ok:
 	jmp	show_boot_progress_asm
 .progress4:
 
+#ifndef CONFIG_SKIP_RELOCATE_UBOOT
+	/* Jump to the RAM copy of start_i386boot */
+	movl	$start_i386boot, %ebp
+	addl	$(CONFIG_SYS_BL_START_RAM - TEXT_BASE), %ebp
+	call	*%ebp		/* Enter, U-boot! */
+#else
 	call	start_i386boot  /* Enter, U-boot! */
+#endif
 
 	/* indicate (lack of) progress */
 	movw	$0x85, %ax
-- 
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