From: Michael Brown <mcb30@etherboot.org>
Date: Thu, 28 Jun 2007 20:56:14 +0000 (+0100)
Subject: Use internal real-mode stack from non-returnable prefixes
X-Git-Tag: v0.9.3~358
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=045fb24557f4c0a11273b28150b9a870f248197d;p=thirdparty%2Fipxe.git

Use internal real-mode stack from non-returnable prefixes
---

diff --git a/src/arch/i386/core/stack16.S b/src/arch/i386/core/stack16.S
new file mode 100644
index 000000000..3380a0836
--- /dev/null
+++ b/src/arch/i386/core/stack16.S
@@ -0,0 +1,13 @@
+	.arch i386
+
+/****************************************************************************
+ * Internal stack
+ ****************************************************************************
+ */
+	.section ".stack16"
+	.align 8
+	.globl _stack16
+_stack16:
+	.space 4096
+	.globl _estack16
+_estack16:
diff --git a/src/arch/i386/prefix/dskprefix.S b/src/arch/i386/prefix/dskprefix.S
index 9b1ebaaf5..1a48716a4 100644
--- a/src/arch/i386/prefix/dskprefix.S
+++ b/src/arch/i386/prefix/dskprefix.S
@@ -350,6 +350,10 @@ msg1end:
 start_runtime:
 	call	install
 
+	/* Set up real-mode stack */
+	movw	%bx, %ss
+	movw	$_estack16, %sp
+
 	/* Jump to .text16 segment */
 	pushw	%ax
 	pushw	$1f
diff --git a/src/arch/i386/prefix/romprefix.S b/src/arch/i386/prefix/romprefix.S
index ced0f49c8..520016996 100644
--- a/src/arch/i386/prefix/romprefix.S
+++ b/src/arch/i386/prefix/romprefix.S
@@ -139,6 +139,10 @@ exec_vector:
 
 	call	install
 
+	/* Set up real-mode stack */
+	movw	%bx, %ss
+	movw	$_estack16, %sp
+
 	/* Jump to .text16 segment */
 	pushw	%ax
 	pushw	$1f