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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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15
src/ints/bios.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: bios.cpp,v 1.57 2006-02-09 11:47:55 qbix79 Exp $ */
/* $Id: bios.cpp,v 1.58 2006-04-22 15:25:45 c2woody Exp $ */
#include "dosbox.h"
#include "mem.h"
@ -818,19 +818,8 @@ public:
/* INT 8 Clock IRQ Handler */
//TODO Maybe give this a special callback that will also call int 8 instead of starting
//a new system
callback[0].Install(INT8_Handler,CB_IRET,"Int 8 Clock");
callback[0].Install(INT8_Handler,CB_IRET_EOI_PIC1,"Int 8 Clock");
callback[0].Set_RealVec(0x8);
Bit16u call_int8=callback[0].Get_callback();
phys_writeb(CB_BASE+(call_int8<<4)+0,(Bit8u)0xFE); //GRP 4
phys_writeb(CB_BASE+(call_int8<<4)+1,(Bit8u)0x38); //Extra Callback instruction
phys_writew(CB_BASE+(call_int8<<4)+2,call_int8); //The immediate word
phys_writeb(CB_BASE+(call_int8<<4)+4,(Bit8u)0x50); // push ax
phys_writeb(CB_BASE+(call_int8<<4)+5,(Bit8u)0xb0); // mov al, 0x20
phys_writeb(CB_BASE+(call_int8<<4)+6,(Bit8u)0x20);
phys_writeb(CB_BASE+(call_int8<<4)+7,(Bit8u)0xe6); // out 0x20, al
phys_writeb(CB_BASE+(call_int8<<4)+8,(Bit8u)0x20);
phys_writeb(CB_BASE+(call_int8<<4)+9,(Bit8u)0x58); // pop ax
phys_writeb(CB_BASE+(call_int8<<4)+10,(Bit8u)0xcf); // iret
mem_writed(BIOS_TIMER,0); //Calculate the correct time