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Be much more carefull about what we leave in unused registers when we call

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the APM-bios.
This stabilizes a couple of APM bioses quite a bit.
They all make the mistake of going into 16-bit mode, without clearing the
top half of the 32bit registers.
Later they do a
|	movw %si,$0x7331
|	movw %ax,0x6(%si)
or something along those lines and crash and burn, because their segment
is already relocated, so adding 0xf0171ce9 to the base of it is bad news.

At least SystemSoft is guilty of this bummer.
This commit is contained in:
Poul-Henning Kamp 1994-12-16 06:16:30 +00:00
parent 784cf072d8
commit 2decd76771
2 changed files with 24 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
sys/i386/apm/apm.c
View file

@ -13,7 +13,7 @@
*
* Sep, 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
*
* $Id: apm.c,v 1.6 1994/11/07 04:23:58 phk Exp $
* $Id: apm.c,v 1.7 1994/11/15 14:09:18 bde Exp $
*/
#include "apm.h"
@ -92,11 +92,18 @@ apm_int(u_long *eax,u_long *ebx,u_long *ecx)
u_long cf;
__asm ("pushl %%ebp
pushl %%edx
pushl %%esi
pushl %%edi
xorl %3,%3
movl %%edi,%3
movl %%esi,%3
lcall _apm_addr
jnc 1f
incl %3
1: popl %%edx
1:
popl %%edi
popl %%esi
popl %%edx
popl %%ebp"
: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=D" (cf)
: "0" (*eax), "1" (*ebx), "2" (*ecx)
@ -175,6 +182,8 @@ apm_getevent(void)
eax = (APM_BIOS<<8) | APM_GETPMEVENT;
ebx = 0;
ecx = 0;
if (apm_int(&eax,&ebx,&ecx))
return PMEV_NOEVENT;
@ -243,6 +252,7 @@ apm_get_info(apm_info_t aip)
eax = (APM_BIOS<<8)|APM_GETPWSTATUS;
ebx = PMDV_ALLDEV;
ecx = 0;
if (apm_int(&eax,&ebx,&ecx))
return 1;

14
sys/i386/bios/apm.c
View file

@ -13,7 +13,7 @@
*
* Sep, 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
*
* $Id: apm.c,v 1.6 1994/11/07 04:23:58 phk Exp $
* $Id: apm.c,v 1.7 1994/11/15 14:09:18 bde Exp $
*/
#include "apm.h"
@ -92,11 +92,18 @@ apm_int(u_long *eax,u_long *ebx,u_long *ecx)
u_long cf;
__asm ("pushl %%ebp
pushl %%edx
pushl %%esi
pushl %%edi
xorl %3,%3
movl %%edi,%3
movl %%esi,%3
lcall _apm_addr
jnc 1f
incl %3
1: popl %%edx
1:
popl %%edi
popl %%esi
popl %%edx
popl %%ebp"
: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=D" (cf)
: "0" (*eax), "1" (*ebx), "2" (*ecx)
@ -175,6 +182,8 @@ apm_getevent(void)
eax = (APM_BIOS<<8) | APM_GETPMEVENT;
ebx = 0;
ecx = 0;
if (apm_int(&eax,&ebx,&ecx))
return PMEV_NOEVENT;
@ -243,6 +252,7 @@ apm_get_info(apm_info_t aip)
eax = (APM_BIOS<<8)|APM_GETPWSTATUS;
ebx = PMDV_ALLDEV;
ecx = 0;
if (apm_int(&eax,&ebx,&ecx))
return 1;