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| author | Keir Fraser <keir.fraser@citrix.com> | 2010-07-08 09:51:40 +0100 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2010-07-08 09:51:40 +0100 |
| commit | 6456803dabb092076c6adb9e0fcb7b2161e7bfec (patch) | |
| tree | 9269b0e805133477f99159b869d3a1fc67f2f1a3 /tools/firmware/rombios | |
| parent | b825e251d26688e4843668a555221d4fbf1f114d (diff) | |
| download | xen-6456803dabb092076c6adb9e0fcb7b2161e7bfec.tar.gz xen-6456803dabb092076c6adb9e0fcb7b2161e7bfec.tar.bz2 xen-6456803dabb092076c6adb9e0fcb7b2161e7bfec.zip | |
rombios: move the stack to 0x9e000 and protect it with an e820 entry
so that we don't corrupt E820_RAM memory with stack ops in S3 wakeup.
It has to move up so the lowest contiguous RAM area is >= 512MiB.
This relies on the previous fix to let DS != SS
Signed-off-by: Paul Durrant <Paul.Durrant@citrix.com>
Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>
Diffstat (limited to 'tools/firmware/rombios')
| -rw-r--r-- | tools/firmware/rombios/rombios.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/tools/firmware/rombios/rombios.c b/tools/firmware/rombios/rombios.c index 3de72cf9d1..4e0157c80f 100644 --- a/tools/firmware/rombios/rombios.c +++ b/tools/firmware/rombios/rombios.c @@ -1,6 +1,6 @@ ///////////////////////////////////////////////////////////////////////// // $Id: rombios.c,v 1.221 2008/12/07 17:32:29 sshwarts Exp $ -///////////////////////////////////////////////////////////////////////// +////////////////////////////#///////////////////////////////////////////// // // Copyright (C) 2002 MandrakeSoft S.A. // @@ -8862,13 +8862,14 @@ int13_out: int18_handler: ;; Boot Failure recovery: try the next device. ;; Reset SP and SS - mov ax, #0xfffe + mov ax, #0x0ffe mov sp, ax - xor ax, ax + mov ax, #0x9e00 mov ss, ax ;; The first time we do this it will have been set to -1 so ;; we will start from device 0. + xor ax, ax mov ds, ax mov bx, word ptr [0x40E] ;; EBDA segment mov ds, bx ;; Set segment @@ -8902,9 +8903,9 @@ int19_relocated: ;; Boot function, relocated ;; ;; Reset SP and SS - mov ax, #0xfffe + mov ax, #0x0ffe mov sp, ax - xor ax, ax + mov ax, #0x9e00 mov ss, ax call _machine_reset @@ -10839,10 +10840,9 @@ normal_post: ; case 0: normal startup cli - mov ax, #0xfffe + mov ax, #0x0ffe mov sp, ax - xor ax, ax - mov ds, ax + mov ax, #0x9e00 mov ss, ax ;; Save shutdown status |