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Some ems weirdness(c2woody)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1789
This commit is contained in:
Peter Veenstra 2004-05-07 23:20:00 +00:00
parent 862d958ecb
commit 7cc6fa6b8f
1 changed files with 14 additions and 11 deletions
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25
src/ints/ems.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: ems.cpp,v 1.32 2004-03-31 22:01:22 harekiet Exp $ */
/* $Id: ems.cpp,v 1.33 2004-05-07 23:20:00 qbix79 Exp $ */
#include <string.h>
#include <stdlib.h>
@ -150,9 +150,20 @@ static Bit8u EMM_MapPage(Bitu phys_page,Bit16u handle,Bit16u log_page) {
// LOG_MSG("EMS MapPage handle %d phys %d log %d",handle,phys_page,log_page);
/* Check for too high physical page */
if (phys_page>=EMM_MAX_PHYS) return EMM_ILL_PHYS;
/* unmapping doesn't need valid handle (as handle isn't used) */
if (log_page==NULL_PAGE) {
/* Unmapping */
emm_mappings[phys_page].handle=NULL_HANDLE;
emm_mappings[phys_page].page=NULL_PAGE;
for (Bitu i=0;i<4;i++)
PAGING_MapPage(EMM_PAGEFRAME4K+phys_page*4+i,EMM_PAGEFRAME4K+phys_page*4+i);
PAGING_ClearTLB();
return EMM_NO_ERROR;
}
/* Check for valid handle */
if (!ValidHandle(handle)) return EMM_INVALID_HANDLE;
/* Check to do unmapping or mappning */
if (log_page<emm_handles[handle].pages) {
/* Mapping it is */
emm_mappings[phys_page].handle=handle;
@ -165,15 +176,7 @@ static Bit8u EMM_MapPage(Bitu phys_page,Bit16u handle,Bit16u log_page) {
}
PAGING_ClearTLB();
return EMM_NO_ERROR;
} else if (log_page==NULL_PAGE) {
/* Unmapping it is */
emm_mappings[phys_page].handle=NULL_HANDLE;
emm_mappings[phys_page].page=NULL_PAGE;
for (Bitu i=0;i<4;i++)
PAGING_MapPage(EMM_PAGEFRAME4K+phys_page*4+i,EMM_PAGEFRAME4K+phys_page*4+i);
PAGING_ClearTLB();
return EMM_NO_ERROR;
} else {
} else {
/* Illegal logical page it is */
return EMM_LOG_OUT_RANGE;
}