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Add some comments explaining what APM_DSVALUE_BUG does no that I know

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what it does and why it's needed.  Now I have to figure out how to fix
the bug. :)

[ No functional changes ]
This commit is contained in:
Nate Williams 1996-07-11 16:35:12 +00:00
parent 2c37256e5a
commit 68753bffb7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=17097
2 changed files with 20 additions and 6 deletions
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13
sys/i386/apm/apm.c
View File

@ -14,7 +14,7 @@
*
* Sep, 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
*
* $Id: apm.c,v 1.44 1996/06/18 01:21:54 bde Exp $
* $Id: apm.c,v 1.45 1996/07/10 15:09:46 nate Exp $
*/
#include "apm.h"
@ -689,6 +689,11 @@ apmattach(struct isa_device *dvp)
#ifdef APM_DSVALUE_BUG
caddr_t apm_bios_work;
/*
* XXX - Malloc enough space for the APM DS, and then copy the
* current DS into the new space since the DS setup by the
* APM bios is going to get wiped out.
*/
apm_bios_work = (caddr_t)malloc(apm_ds_limit, M_DEVBUF, M_NOWAIT);
bcopy((caddr_t)((apm_ds_base << 4) + APM_KERNBASE), apm_bios_work,
apm_ds_limit);
@ -708,6 +713,7 @@ apmattach(struct isa_device *dvp)
sc->cs_entry = apm_cs_entry;
#ifdef APM_DSVALUE_BUG
/* Set the DS base to point to the newly made copy of the APM DS */
sc->ds_base = (u_int)apm_bios_work;
#endif /* APM_DSVALUE_BUG */
@ -726,10 +732,11 @@ apmattach(struct isa_device *dvp)
printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
sc->cs_entry, is_enabled(sc->slow_idle_cpu),
is_enabled(!sc->disabled));
printf("apm: CS_limit=%x, DS_limit=%x\n", sc->cs_limit, sc->ds_limit);
printf("apm: CS_limit=0x%x, DS_limit=0x%x\n",
sc->cs_limit, sc->ds_limit);
#endif /* APM_DEBUG */
#ifdef APM_DEBUG
#ifdef 0
/* Workaround for some buggy APM BIOS implementations */
sc->cs_limit = 0xffff;
sc->ds_limit = 0xffff;

13
sys/i386/bios/apm.c
View File

@ -14,7 +14,7 @@
*
* Sep, 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
*
* $Id: apm.c,v 1.44 1996/06/18 01:21:54 bde Exp $
* $Id: apm.c,v 1.45 1996/07/10 15:09:46 nate Exp $
*/
#include "apm.h"
@ -689,6 +689,11 @@ apmattach(struct isa_device *dvp)
#ifdef APM_DSVALUE_BUG
caddr_t apm_bios_work;
/*
* XXX - Malloc enough space for the APM DS, and then copy the
* current DS into the new space since the DS setup by the
* APM bios is going to get wiped out.
*/
apm_bios_work = (caddr_t)malloc(apm_ds_limit, M_DEVBUF, M_NOWAIT);
bcopy((caddr_t)((apm_ds_base << 4) + APM_KERNBASE), apm_bios_work,
apm_ds_limit);
@ -708,6 +713,7 @@ apmattach(struct isa_device *dvp)
sc->cs_entry = apm_cs_entry;
#ifdef APM_DSVALUE_BUG
/* Set the DS base to point to the newly made copy of the APM DS */
sc->ds_base = (u_int)apm_bios_work;
#endif /* APM_DSVALUE_BUG */
@ -726,10 +732,11 @@ apmattach(struct isa_device *dvp)
printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
sc->cs_entry, is_enabled(sc->slow_idle_cpu),
is_enabled(!sc->disabled));
printf("apm: CS_limit=%x, DS_limit=%x\n", sc->cs_limit, sc->ds_limit);
printf("apm: CS_limit=0x%x, DS_limit=0x%x\n",
sc->cs_limit, sc->ds_limit);
#endif /* APM_DEBUG */
#ifdef APM_DEBUG
#ifdef 0
/* Workaround for some buggy APM BIOS implementations */
sc->cs_limit = 0xffff;
sc->ds_limit = 0xffff;