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Diffstat (limited to 'contrib/syslinux-4.02/core/stack.inc')
| -rw-r--r-- | contrib/syslinux-4.02/core/stack.inc | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/core/stack.inc b/contrib/syslinux-4.02/core/stack.inc new file mode 100644 index 0000000..788db64 --- /dev/null +++ b/contrib/syslinux-4.02/core/stack.inc @@ -0,0 +1,47 @@ +; ----------------------------------------------------------------------- +; +; Copyright 2005-2008 H. Peter Anvin - All Rights Reserved +; Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin +; +; 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 + lss esp,[BaseStack] + mov dword [PMESP],__stack_end ; Reset PM stack + sti + cld +%endmacro + + section .data16 + alignz 4 + global BaseStack +BaseStack dd StackHome ; ESP of the "home" stack pointer + dw 0 ; SS of the "home" stack pointer + + section .text16 + +%endif ; _STACK_INC |