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Fix for aces of the deep with vcpi.(wd)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2507
This commit is contained in:
Peter Veenstra 2006-02-18 14:45:12 +00:00
parent db884adba4
commit a2cb88f491
1 changed files with 21 additions and 4 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 1.45 2006-02-09 11:47:56 qbix79 Exp $ */
/* $Id: ems.cpp,v 1.46 2006-02-18 14:45:12 qbix79 Exp $ */
#include <string.h>
#include <stdlib.h>
@ -611,18 +611,31 @@ static Bitu INT67_Handler(void) {
reg_ah=EMM_NO_ERROR;
reg_bx=0x100;
break;
case 0x01: /* VCPI Get Protected Mode Interface */
case 0x01: { /* VCPI Get Protected Mode Interface */
Bit16u ct;
/* Set up page table buffer */
for (Bit16u ct=0; ct<0xff; ct++) {
for (ct=0; ct<0xff; ct++) {
real_writeb(SegValue(es),reg_di+ct*4+0x00,0x67); // access bits
real_writew(SegValue(es),reg_di+ct*4+0x01,ct*0x10); // mapping
real_writeb(SegValue(es),reg_di+ct*4+0x03,0x00);
}
for (Bit16u ct=0xff; ct<0x100; ct++) {
for (ct=0xff; ct<0x100; ct++) {
real_writeb(SegValue(es),reg_di+ct*4+0x00,0x67); // access bits
real_writew(SegValue(es),reg_di+ct*4+0x01,(ct-0xff)*0x10+0x1100); // mapping
real_writeb(SegValue(es),reg_di+ct*4+0x03,0x00);
}
/* adjust paging entries for page frame (if mapped) */
for (ct=0; ct<4; ct++) {
Bit16u handle=emm_mappings[ct].handle;
if (handle!=0xffff) {
Bit16u memh=(Bit16u)MEM_NextHandleAt(emm_handles[handle].mem,emm_mappings[ct].page*4);
Bit16u entry_addr=reg_di+(EMM_PAGEFRAME>>6)+(ct*0x10);
real_writew(SegValue(es),entry_addr+0x00+0x01,(memh+0)*0x10); // mapping of 1/4 of page
real_writew(SegValue(es),entry_addr+0x04+0x01,(memh+1)*0x10); // mapping of 2/4 of page
real_writew(SegValue(es),entry_addr+0x08+0x01,(memh+2)*0x10); // mapping of 3/4 of page
real_writew(SegValue(es),entry_addr+0x0c+0x01,(memh+3)*0x10); // mapping of 4/4 of page
}
}
reg_di+=0x400; // advance pointer by 0x100*4
/* Set up three descriptor table entries */
@ -636,6 +649,7 @@ static Bitu INT67_Handler(void) {
reg_ebx=(vcpi.pm_interface&0xffff);
reg_ah=EMM_NO_ERROR;
break;
}
case 0x02: /* VCPI Maximum Physical Address */
reg_edx=((MEM_TotalPages()*MEM_PAGESIZE)-1)&0xfffff000;
reg_ah=EMM_NO_ERROR;
@ -737,6 +751,8 @@ static Bitu INT67_Handler(void) {
CPU_SetSegGeneral(fs,0);
CPU_SetSegGeneral(gs,0);
// MEM_A20_Enable(true);
/* Switch to protected mode */
reg_flags&=(~(FLAG_VM|FLAG_NT));
reg_flags|=0x3000;
@ -801,6 +817,7 @@ static Bitu VCPI_PM_Handler() {
reg_flags&=(~FLAG_NT);
reg_esp+=8; // skip interrupt return information
// MEM_A20_Enable(false);
/* Switch to v86-task */
CPU_IRET(true,0);