From 8ca8d7665d671e10d72b8fcb4d69121d75f7906e Mon Sep 17 00:00:00 2001
From: Eric Biederman <ebiederm@xmission.com>
Date: Tue, 22 Apr 2003 19:02:15 +0000
Subject: - Initial checkin of the freebios2 tree

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@784 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
---
 src/cpu/i386/entry32.inc | 55 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 src/cpu/i386/entry32.inc

(limited to 'src/cpu/i386/entry32.inc')

diff --git a/src/cpu/i386/entry32.inc b/src/cpu/i386/entry32.inc
new file mode 100644
index 0000000000..8ccd638e95
--- /dev/null
+++ b/src/cpu/i386/entry32.inc
@@ -0,0 +1,55 @@
+/* For starting linuxBIOS in protected mode */
+
+#include <arch/rom_segs.h>
+
+/* 	.section ".rom.text" */
+	.code32
+
+	.align	4
+.globl EXT(gdtptr)
+
+gdt:
+EXT(gdtptr):
+	.word	gdt_end - gdt -1 /* compute the table limit */
+	.long	gdt		 /* we know the offset */
+	.word	0
+
+/* flat code segment */
+	.word	0xffff, 0x0000		
+	.byte	0x00, 0x9b, 0xcf, 0x00	
+	
+/* flat data segment */
+	.word	0xffff, 0x0000		
+	.byte	0x00, 0x93, 0xcf, 0x00	
+
+gdt_end:
+	
+
+/*
+ *	When we come here we are in protected mode. We expand 
+ *	the stack and copies the data segment from ROM to the
+ *	memory.
+ *
+ *	After that, we call the chipset bootstrap routine that
+ *	does what is left of the chipset initialization. 
+ *
+ *	NOTE aligned to 4 so that we are sure that the prefetch
+ *	cache will be reloaded.
+ */
+	.align	4
+.globl EXT(protected_start)
+EXT(protected_start):
+
+	lgdt	%cs:gdtptr
+	ljmp	$ROM_CODE_SEG, $__protected_start
+	
+__protected_start:
+	intel_chip_post_macro(0x10)	/* post 10 */
+
+	movw	$ROM_DATA_SEG, %ax
+	movw	%ax, %ds
+	movw	%ax, %es
+	movw	%ax, %ss
+	movw	%ax, %fs
+	movw	%ax, %gs
+
-- 
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