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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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102
src/cpu/callback.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: callback.cpp,v 1.31 2006-02-12 23:28:21 harekiet Exp $ */
/* $Id: callback.cpp,v 1.32 2006-04-22 15:25:44 c2woody Exp $ */
#include <stdlib.h>
#include <string.h>
@ -133,42 +133,6 @@ const char* CALLBACK_GetDescription(Bitu nr) {
return CallBack_Description[nr];
};
bool CALLBACK_Setup(Bitu callback,CallBack_Handler handler,Bitu type,const char* descr) {
if (callback>=CB_MAX) return false;
switch (type) {
case CB_RETF:
phys_writeb(CB_BASE+(callback<<4)+0,(Bit8u)0xFE); //GRP 4
phys_writeb(CB_BASE+(callback<<4)+1,(Bit8u)0x38); //Extra Callback instruction
phys_writew(CB_BASE+(callback<<4)+2,callback); //The immediate word
phys_writeb(CB_BASE+(callback<<4)+4,(Bit8u)0xCB); //A RETF Instruction
break;
case CB_IRET:
phys_writeb(CB_BASE+(callback<<4)+0,(Bit8u)0xFE); //GRP 4
phys_writeb(CB_BASE+(callback<<4)+1,(Bit8u)0x38); //Extra Callback instruction
phys_writew(CB_BASE+(callback<<4)+2,callback); //The immediate word
phys_writeb(CB_BASE+(callback<<4)+4,(Bit8u)0xCF); //An IRET Instruction
break;
case CB_IRET_STI:
phys_writeb(CB_BASE+(callback<<4)+0,(Bit8u)0xFB); //STI
phys_writeb(CB_BASE+(callback<<4)+1,(Bit8u)0xFE); //GRP 4
phys_writeb(CB_BASE+(callback<<4)+2,(Bit8u)0x38); //Extra Callback instruction
phys_writew(CB_BASE+(callback<<4)+3,callback); //The immediate word
phys_writeb(CB_BASE+(callback<<4)+5,(Bit8u)0xCF); //An IRET Instruction
break;
default:
E_Exit("CALLBACK:Setup:Illegal type %d",type);
}
CallBack_Handlers[callback]=handler;
CALLBACK_SetDescription(callback,descr);
return true;
}
void CALLBACK_RemoveSetup(Bitu callback) {
for (Bitu i = 0;i < 16;i++) {
phys_writeb(CB_BASE+(callback<<4)+i ,(Bit8u) 0x00);
}
}
Bitu CALLBACK_SetupExtra(Bitu callback, Bitu type, PhysPt physAddress) {
if (callback>=CB_MAX)
return 0;
@ -191,6 +155,13 @@ Bitu CALLBACK_SetupExtra(Bitu callback, Bitu type, PhysPt physAddress) {
phys_writew(physAddress+2,callback); //The immediate word
phys_writeb(physAddress+4,(Bit8u)0xCF); //An IRET Instruction
return 5;
case CB_IRETD:
phys_writeb(physAddress+0,(Bit8u)0xFE); //GRP 4
phys_writeb(physAddress+1,(Bit8u)0x38); //Extra Callback instruction
phys_writew(physAddress+2,callback); //The immediate word
phys_writeb(physAddress+4,(Bit8u)0x66); //An IRETD Instruction
phys_writeb(physAddress+5,(Bit8u)0xCF);
return 6;
case CB_IRET_STI:
phys_writeb(physAddress+0,(Bit8u)0xFB); //STI
phys_writeb(physAddress+1,(Bit8u)0xFE); //GRP 4
@ -198,12 +169,59 @@ Bitu CALLBACK_SetupExtra(Bitu callback, Bitu type, PhysPt physAddress) {
phys_writew(physAddress+3, callback); //The immediate word
phys_writeb(physAddress+5,(Bit8u)0xCF); //An IRET Instruction
return 6;
case CB_IRET_EOI_PIC1:
phys_writeb(physAddress+0,(Bit8u)0xFE); //GRP 4
phys_writeb(physAddress+1,(Bit8u)0x38); //Extra Callback instruction
phys_writew(physAddress+2,callback); //The immediate word
phys_writeb(physAddress+4,(Bit8u)0x50); // push ax
phys_writeb(physAddress+5,(Bit8u)0xb0); // mov al, 0x20
phys_writeb(physAddress+6,(Bit8u)0x20);
phys_writeb(physAddress+7,(Bit8u)0xe6); // out 0x20, al
phys_writeb(physAddress+8,(Bit8u)0x20);
phys_writeb(physAddress+9,(Bit8u)0x58); // pop ax
phys_writeb(physAddress+10,(Bit8u)0xcf);//An IRET Instruction
return 11;
case CB_HOOKABLE:
phys_writeb(physAddress+0,(Bit8u)0xEB); //jump near
phys_writeb(physAddress+1,(Bit8u)0x03); //offset
phys_writeb(physAddress+2,(Bit8u)0x90); //NOP
phys_writeb(physAddress+3,(Bit8u)0x90); //NOP
phys_writeb(physAddress+4,(Bit8u)0x90); //NOP
phys_writeb(physAddress+5,(Bit8u)0xFE); //GRP 4
phys_writeb(physAddress+6,(Bit8u)0x38); //Extra Callback instruction
phys_writew(physAddress+7,callback); //The immediate word
phys_writeb(physAddress+9,(Bit8u)0xCB); //A RETF Instruction
return 10;
default:
E_Exit("CALLBACK:Setup:Illegal type %d",type);
}
return 0;
}
bool CALLBACK_Setup(Bitu callback,CallBack_Handler handler,Bitu type,const char* descr) {
if (callback>=CB_MAX) return false;
CALLBACK_SetupExtra(callback,type,CB_BASE+(callback<<4)+0);
CallBack_Handlers[callback]=handler;
CALLBACK_SetDescription(callback,descr);
return true;
}
Bitu CALLBACK_Setup(Bitu callback,CallBack_Handler handler,Bitu type,PhysPt addr,const char* descr) {
if (callback>=CB_MAX) return 0;
Bitu csize=CALLBACK_SetupExtra(callback,type,addr);
if (csize>0) {
CallBack_Handlers[callback]=handler;
CALLBACK_SetDescription(callback,descr);
}
return csize;
}
void CALLBACK_RemoveSetup(Bitu callback) {
for (Bitu i = 0;i < 16;i++) {
phys_writeb(CB_BASE+(callback<<4)+i ,(Bit8u) 0x00);
}
}
CALLBACK_HandlerObject::~CALLBACK_HandlerObject(){
if(!installed) return;
if(m_type == CALLBACK_HandlerObject::SETUP) {
@ -233,6 +251,14 @@ void CALLBACK_HandlerObject::Install(CallBack_Handler handler,Bitu type,const ch
CALLBACK_Setup(m_callback,handler,type,description);
} else E_Exit("Allready installed");
}
void CALLBACK_HandlerObject::Install(CallBack_Handler handler,Bitu type,PhysPt addr,const char* description){
if(!installed) {
installed=true;
m_type=SETUP;
m_callback=CALLBACK_Allocate();
CALLBACK_Setup(m_callback,handler,type,addr,description);
} else E_Exit("Allready installed");
}
void CALLBACK_HandlerObject::Allocate(CallBack_Handler handler,const char* description) {
if(!installed) {
installed=true;
@ -291,7 +317,9 @@ void CALLBACK_Init(Section* sec) {
rint_base+=6;
}
// setup a few interrupt handlers that point to bios IRETs by default
real_writed(0,0x67*4,CALLBACK_RealPointer(call_default));
real_writed(0,0x68*4,CALLBACK_RealPointer(call_default));
real_writed(0,0x5c*4,CALLBACK_RealPointer(call_default)); //Network stuff
//real_writed(0,0xf*4,0); some games don't like it