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[Bochs-developers] [PATCH resend] compute checksum for roms bigger than a segment

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This commit is contained in:
Stanislav Shwartsman 2009-04-09 20:34:09 +00:00
parent adb5243f25
commit f34cce9177
1 changed files with 29 additions and 8 deletions
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37
bochs/bios/rombios.c
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@ -1,5 +1,5 @@
///////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////
// $Id: rombios.c,v 1.228 2009-04-03 15:53:46 sshwarts Exp $ // $Id: rombios.c,v 1.229 2009-04-09 20:34:09 sshwarts Exp $
///////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////
// //
// Copyright (C) 2002 MandrakeSoft S.A. // Copyright (C) 2002 MandrakeSoft S.A.
@ -937,7 +937,7 @@ Bit16u cdrom_boot();
#endif // BX_ELTORITO_BOOT #endif // BX_ELTORITO_BOOT
static char bios_cvs_version_string[] = "$Revision: 1.228 $ $Date: 2009-04-03 15:53:46 $"; static char bios_cvs_version_string[] = "$Revision: 1.229 $ $Date: 2009-04-09 20:34:09 $";
#define BIOS_COPYRIGHT_STRING "(c) 2002 MandrakeSoft S.A. Written by Kevin Lawton & the Bochs team." #define BIOS_COPYRIGHT_STRING "(c) 2002 MandrakeSoft S.A. Written by Kevin Lawton & the Bochs team."
@ -10154,22 +10154,43 @@ no_serial:
ret ret
rom_checksum: rom_checksum:
push ax pusha
push bx push ds
push cx
xor ax, ax xor ax, ax
xor bx, bx xor bx, bx
xor cx, cx xor cx, cx
xor dx, dx
mov ch, [2] mov ch, [2]
shl cx, #1 shl cx, #1
jnc checksum_loop
xchg dx, cx
dec cx
checksum_loop: checksum_loop:
add al, [bx] add al, [bx]
inc bx inc bx
loop checksum_loop loop checksum_loop
test dx, dx
je checksum_out
add al, [bx]
mov cx, dx
mov dx, ds
add dh, #0x10
mov ds, dx
xor dx, dx
xor bx, bx
jmp checksum_loop
checksum_out:
and al, #0xff and al, #0xff
pop cx pop ds
pop bx popa
pop ax
ret ret