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Code Issues Releases Activity

Don't trust the segment limits that the BIOS reports; instead give it

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as much space as possible to avoid lossage due to sloppy BIOS
programming.
This commit is contained in:
Mike Smith 1999-08-02 18:46:34 +00:00
parent bd5844977d
commit 091edd6845
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=49380
2 changed files with 10 additions and 20 deletions
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15
sys/i386/apm/apm.c
View File

@ -15,7 +15,7 @@
*
* Sep, 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
*
* $Id: apm.c,v 1.96 1999/07/30 08:24:19 msmith Exp $
* $Id: apm.c,v 1.97 1999/07/30 19:34:58 msmith Exp $
*/
#include "opt_devfs.h"
@ -747,9 +747,9 @@ apm_probe(device_t dev)
sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
sc->bios.seg.code32.limit = 0xffff;
sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
sc->bios.seg.code16.limit = vmf.vmf_si;
sc->bios.seg.code16.limit = 0xffff;
sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE;
sc->bios.seg.data.limit = vmf.vmf_di;
sc->bios.seg.data.limit = 0xffff;
sc->bios.entry = vmf.vmf_ebx;
sc->connectmode = APM_PROT32CONNECT;
} else {
@ -762,17 +762,12 @@ apm_probe(device_t dev)
return (ENXIO);
}
sc->bios.seg.code16.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
sc->bios.seg.code16.limit = vmf.vmf_si;
sc->bios.seg.code16.limit = 0xffff;
sc->bios.seg.data.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
sc->bios.seg.data.limit = vmf.vmf_di;
sc->bios.seg.data.limit = 0xffff;
sc->bios.entry = vmf.vmf_bx;
sc->connectmode = APM_PROT16CONNECT;
}
if (apm_version == 0x100) {
/* APM v1.0 does not set SI/DI */
sc->bios.seg.code16.limit = 0xffff;
sc->bios.seg.data.limit = 0xffff;
}
return(0);
}

15
sys/i386/bios/apm.c
View File

@ -15,7 +15,7 @@
*
* Sep, 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
*
* $Id: apm.c,v 1.96 1999/07/30 08:24:19 msmith Exp $
* $Id: apm.c,v 1.97 1999/07/30 19:34:58 msmith Exp $
*/
#include "opt_devfs.h"
@ -747,9 +747,9 @@ apm_probe(device_t dev)
sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
sc->bios.seg.code32.limit = 0xffff;
sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
sc->bios.seg.code16.limit = vmf.vmf_si;
sc->bios.seg.code16.limit = 0xffff;
sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE;
sc->bios.seg.data.limit = vmf.vmf_di;
sc->bios.seg.data.limit = 0xffff;
sc->bios.entry = vmf.vmf_ebx;
sc->connectmode = APM_PROT32CONNECT;
} else {
@ -762,17 +762,12 @@ apm_probe(device_t dev)
return (ENXIO);
}
sc->bios.seg.code16.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
sc->bios.seg.code16.limit = vmf.vmf_si;
sc->bios.seg.code16.limit = 0xffff;
sc->bios.seg.data.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
sc->bios.seg.data.limit = vmf.vmf_di;
sc->bios.seg.data.limit = 0xffff;
sc->bios.entry = vmf.vmf_bx;
sc->connectmode = APM_PROT16CONNECT;
}
if (apm_version == 0x100) {
/* APM v1.0 does not set SI/DI */
sc->bios.seg.code16.limit = 0xffff;
sc->bios.seg.data.limit = 0xffff;
}
return(0);
}