[syslinux:chainload] pxelinux: stop using the PXE-provided stack

[syslinux-bot for H. Peter Anvin]

Commit-ID:  5c3b652f0d1fa54519fa563e53af5f57a02cd87b
Gitweb:     http://syslinux.zytor.com/commit/5c3b652f0d1fa54519fa563e53af5f57a02cd87b
Author:     H. Peter Anvin <hpa at zytor.com>
AuthorDate: Wed, 3 Feb 2010 15:20:19 -0800
Committer:  H. Peter Anvin <hpa at zytor.com>
CommitDate: Wed, 3 Feb 2010 15:20:19 -0800

pxelinux: stop using the PXE-provided stack

Using the PXE-provided stack complicates things tremendously for gPXE
chainloading support, plus we are hostages to the stack size set up by
the PXE stack (1.5K by spec.)

Use a private stack instead, as the fsc branch already does.

Signed-off-by: H. Peter Anvin <hpa at zytor.com>


---
 core/pxelinux.asm |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/pxelinux.asm b/core/pxelinux.asm
index 651dd4c..bf46ff6 100644
--- a/core/pxelinux.asm
+++ b/core/pxelinux.asm
@@ -48,7 +48,7 @@ TFTP_LARGEBLK	equ (TFTP_MTU-20-8-4)	; MTU - IP hdr - UDP hdr - TFTP hdr
 ; Standard TFTP block size
 TFTP_BLOCKSIZE_LG2 equ 9		; log2(bytes/block)
 TFTP_BLOCKSIZE	equ (1 << TFTP_BLOCKSIZE_LG2)
-%assign USE_PXE_PROVIDED_STACK 1	; Use stack provided by PXE?
+%assign USE_PXE_PROVIDED_STACK 0	; Use stack provided by PXE?
 
 SECTOR_SHIFT	equ TFTP_BLOCKSIZE_LG2
 SECTOR_SIZE	equ TFTP_BLOCKSIZE
@@ -217,7 +217,7 @@ packet_buf_size	equ $-packet_buf
 		; PXELINUX needs more BSS than the other derivatives;
 		; therefore we relocate it from 7C00h on startup.
 		;
-StackBuf	equ $			; Base of stack if we use our own
+StackBuf	equ $-44		; Base of stack if we use our own
 
 ;
 ; Primary entry point.