Use internal real-mode stack from non-returnable prefixes

2007-06-28 21:56:14 +01:00 · 2007-06-28 21:56:14 +01:00 · 045fb24557
parent 00473f0952
commit 045fb24557
3 changed files with 21 additions and 0 deletions
--- a/src/arch/i386/core/stack16.S
+++ 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:
--- 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
--- 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