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move callbacks into read-only memory (Pinball/Adventure construction kit booters)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2612
This commit is contained in:
Sebastian Strohhäcker 2006-04-22 15:25:45 +00:00
parent 1d11c37e23
commit 1d89346c16
8 changed files with 131 additions and 140 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 1.50 2006-04-18 13:52:24 qbix79 Exp $ */
/* $Id: ems.cpp,v 1.51 2006-04-22 15:25:45 c2woody Exp $ */
#include <string.h>
#include <stdlib.h>
@ -721,12 +721,17 @@ static Bitu INT67_Handler(void) {
reg_di+=0x400; // advance pointer by 0x100*4
/* Set up three descriptor table entries */
real_writed(SegValue(ds),reg_si+0x00,0x8000ffff); // descriptor 1 (code segment)
real_writed(SegValue(ds),reg_si+0x04,0x00009a0c); // descriptor 1
real_writed(SegValue(ds),reg_si+0x08,0x0000ffff); // descriptor 2 (data segment)
real_writed(SegValue(ds),reg_si+0x0c,0x00009200); // descriptor 2
real_writed(SegValue(ds),reg_si+0x10,0x0000ffff); // descriptor 3
real_writed(SegValue(ds),reg_si+0x14,0x00009200); // descriptor 3
Bit32u cbseg_low=(CB_BASE&0xffff)<<16;
Bit32u cbseg_high=(CB_BASE&0x1f0000)>>16;
/* Descriptor 1 (code segment, callback segment) */
real_writed(SegValue(ds),reg_si+0x00,0x0000ffff|cbseg_low);
real_writed(SegValue(ds),reg_si+0x04,0x00009a00|cbseg_high);
/* Descriptor 2 (data segment, full access) */
real_writed(SegValue(ds),reg_si+0x08,0x0000ffff);
real_writed(SegValue(ds),reg_si+0x0c,0x00009200);
/* Descriptor 3 (full access) */
real_writed(SegValue(ds),reg_si+0x10,0x0000ffff);
real_writed(SegValue(ds),reg_si+0x14,0x00009200);
reg_ebx=(vcpi.pm_interface&0xffff);
reg_ah=EMM_NO_ERROR;
@ -1185,13 +1190,9 @@ public:
if (!ENABLE_VCPI) return;
/* Install a callback that handles VCPI-requests in protected mode requests */
call_vcpi.Install(&VCPI_PM_Handler,CB_RETF,"VCPI PM");
call_vcpi.Install(&VCPI_PM_Handler,CB_IRETD,"VCPI PM");
vcpi.pm_interface=(call_vcpi.Get_callback())<<4;
/* Use IRETD instead of IRET for this protected mode callback */
mem_writeb(CB_BASE+vcpi.pm_interface+4,(Bit8u)0x66);
mem_writeb(CB_BASE+vcpi.pm_interface+5,(Bit8u)0xCB); //A IRETD Instruction
/* Initialize private data area and set up descriptor tables */
SetupVCPI();