aboutsummaryrefslogtreecommitdiffstats
path: root/core/stack.inc
diff options
context:
space:
mode:
Diffstat (limited to 'core/stack.inc')
-rw-r--r--core/stack.inc47
1 files changed, 47 insertions, 0 deletions
diff --git a/core/stack.inc b/core/stack.inc
new file mode 100644
index 00000000..f670dec0
--- /dev/null
+++ b/core/stack.inc
@@ -0,0 +1,47 @@
+; -----------------------------------------------------------------------
+;
+; Copyright 2005-2008 H. Peter Anvin - All Rights Reserved
+;
+; This program is free software; you can redistribute it and/or modify
+; it under the terms of the GNU General Public License as published by
+; the Free Software Foundation, Inc., 53 Temple Place Ste 330,
+; Boston MA 02111-1307, USA; either version 2 of the License, or
+; (at your option) any later version; incorporated herein by reference.
+;
+; -----------------------------------------------------------------------
+
+;
+; stack.inc
+;
+; How to reset the stack pointer
+;
+
+%ifndef _STACK_INC
+%define _STACK_INC
+
+;
+; This macro resets the stack pointer (including SS), and sets
+; DS == ES == 0, interrupts on, DF = 0.
+;
+; It takes a 16-bit register that can be safely clobbered as parameter.
+;
+%macro RESET_STACK_AND_SEGS 1
+ xor %1,%1
+ mov ds,%1
+ mov es,%1
+%if IS_SYSLINUX || IS_EXTLINUX
+ mov ss,%1 ; Just in case...
+ mov sp,StackBuf-2*5 ; Reset stack
+%elif IS_PXELINUX
+ lss esp,[BaseStack]
+%elif IS_ISOLINUX
+ mov ss,%1
+ mov sp,StackBuf-2*2
+%else
+ NEED TO KNOW HOW TO RESET STACK
+%endif
+ sti
+ cld
+%endmacro
+
+%endif ; _STACK_INC