add mouse driver backdoor entry point (enables mouse in Last half of Darkness, PC-BLOX)
Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2869
This commit is contained in:
Sebastian Strohhäcker
parent
432c61d1fa
commit
7859569c6d
3 changed files with 103 additions and 8 deletions
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@ -16,7 +16,7 @@
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* $Id: callback.h,v 1.19 2007-01-08 19:45:37 qbix79 Exp $ */
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/* $Id: callback.h,v 1.20 2007-06-03 16:46:33 c2woody Exp $ */
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#ifndef DOSBOX_CALLBACK_H
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#define DOSBOX_CALLBACK_H
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@ -28,8 +28,8 @@
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typedef Bitu (*CallBack_Handler)(void);
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extern CallBack_Handler CallBack_Handlers[];
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enum { CB_RETN,CB_RETF,CB_IRET,CB_IRETD,CB_IRET_STI,CB_IRET_EOI_PIC1,
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CB_IRQ0,CB_IRQ1,CB_IRQ9,CB_IRQ12,CB_IRQ12_RET,CB_IRQ6_PCJR,
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enum { CB_RETN,CB_RETF,CB_RETF8,CB_IRET,CB_IRETD,CB_IRET_STI,CB_IRET_EOI_PIC1,
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CB_IRQ0,CB_IRQ1,CB_IRQ9,CB_IRQ12,CB_IRQ12_RET,CB_IRQ6_PCJR,CB_MOUSE,
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CB_INT29,CB_INT16,CB_HOOKABLE,CB_TDE_IRET,CB_IPXESR,CB_IPXESR_RET };
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#define CB_MAX 128
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@ -16,7 +16,7 @@
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* $Id: callback.cpp,v 1.36 2007-01-08 19:45:38 qbix79 Exp $ */
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/* $Id: callback.cpp,v 1.37 2007-06-03 16:46:33 c2woody Exp $ */
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#include <stdlib.h>
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#include <string.h>
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@ -155,6 +155,16 @@ Bitu CALLBACK_SetupExtra(Bitu callback, Bitu type, PhysPt physAddress, bool use_
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}
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phys_writeb(physAddress+0x00,(Bit8u)0xCB); //A RETF Instruction
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return (use_cb?5:1);
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case CB_RETF8:
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if (use_cb) {
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phys_writeb(physAddress+0x00,(Bit8u)0xFE); //GRP 4
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phys_writeb(physAddress+0x01,(Bit8u)0x38); //Extra Callback instruction
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phys_writew(physAddress+0x02, callback); //The immediate word
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physAddress+=4;
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}
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phys_writeb(physAddress+0x00,(Bit8u)0xCA); //A RETF 8 Instruction
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phys_writew(physAddress+0x01,(Bit16u)0x0008);
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return (use_cb?7:3);
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case CB_IRET:
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if (use_cb) {
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phys_writeb(physAddress+0x00,(Bit8u)0xFE); //GRP 4
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@ -300,6 +310,18 @@ Bitu CALLBACK_SetupExtra(Bitu callback, Bitu type, PhysPt physAddress, bool use_
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phys_writeb(physAddress+0x0e,(Bit8u)0x58); // pop ax
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phys_writeb(physAddress+0x0f,(Bit8u)0xcf); //An IRET Instruction
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return (use_cb?0x14:0x10);
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case CB_MOUSE:
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phys_writew(physAddress+0x00,(Bit16u)0x07eb); // jmp i33hd
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physAddress+=9;
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// jump here to (i33hd):
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if (use_cb) {
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phys_writeb(physAddress+0x00,(Bit8u)0xFE); //GRP 4
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phys_writeb(physAddress+0x01,(Bit8u)0x38); //Extra Callback instruction
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phys_writew(physAddress+0x02,callback); //The immediate word
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physAddress+=4;
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}
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phys_writeb(physAddress+0x00,(Bit8u)0xCF); //An IRET Instruction
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return (use_cb?0x0e:0x0a);
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case CB_INT16:
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phys_writeb(physAddress+0x00,(Bit8u)0xFB); //STI
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if (use_cb) {
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@ -16,7 +16,7 @@
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* $Id: mouse.cpp,v 1.66 2007-01-08 19:45:41 qbix79 Exp $ */
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/* $Id: mouse.cpp,v 1.67 2007-06-03 16:46:33 c2woody Exp $ */
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#include <string.h>
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#include <math.h>
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@ -34,7 +34,7 @@
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#include "bios.h"
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static Bitu call_int33,call_int74,int74_ret_callback;
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static Bitu call_int33,call_int74,int74_ret_callback,call_mouse_bd;
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static Bit16u ps2cbseg,ps2cbofs;
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static bool useps2callback,ps2callbackinit;
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static Bit16u call_ps2;
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@ -862,6 +862,65 @@ static Bitu INT33_Handler(void) {
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return CBRET_NONE;
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}
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static Bitu MOUSE_BD_Handler(void) {
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// the stack contains offsets to register values
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Bit16u raxpt=real_readw(SegValue(ss),reg_sp+0x0a);
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Bit16u rbxpt=real_readw(SegValue(ss),reg_sp+0x08);
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Bit16u rcxpt=real_readw(SegValue(ss),reg_sp+0x06);
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Bit16u rdxpt=real_readw(SegValue(ss),reg_sp+0x04);
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// read out the actual values, registers ARE overwritten
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Bit16u rax=real_readw(SegValue(ds),raxpt);
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reg_ax=rax;
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reg_bx=real_readw(SegValue(ds),rbxpt);
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reg_cx=real_readw(SegValue(ds),rcxpt);
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reg_dx=real_readw(SegValue(ds),rdxpt);
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// LOG_MSG("MOUSE BD: %04X %X %X %X %d %d",reg_ax,reg_bx,reg_cx,reg_dx,POS_X,POS_Y);
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// some functions are treated in a special way (additional registers)
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switch (rax) {
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case 0x09: /* Define GFX Cursor */
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case 0x16: /* Save driver state */
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case 0x17: /* load driver state */
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SegSet16(es,SegValue(ds));
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break;
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case 0x0c: /* Define interrupt subroutine parameters */
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case 0x14: /* Exchange event-handler */
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if (reg_bx!=0) SegSet16(es,reg_bx);
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else SegSet16(es,SegValue(ds));
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break;
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case 0x10: /* Define screen region for updating */
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reg_cx=real_readw(SegValue(ds),rdxpt);
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reg_dx=real_readw(SegValue(ds),rdxpt+2);
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reg_si=real_readw(SegValue(ds),rdxpt+4);
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reg_di=real_readw(SegValue(ds),rdxpt+6);
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break;
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default:
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break;
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}
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INT33_Handler();
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// save back the registers, too
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real_writew(SegValue(ds),raxpt,reg_ax);
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real_writew(SegValue(ds),rbxpt,reg_bx);
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real_writew(SegValue(ds),rcxpt,reg_cx);
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real_writew(SegValue(ds),rdxpt,reg_dx);
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switch (rax) {
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case 0x1f: /* Disable Mousedriver */
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real_writew(SegValue(ds),rbxpt,SegValue(es));
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break;
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case 0x14: /* Exchange event-handler */
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real_writew(SegValue(ds),rcxpt,SegValue(es));
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break;
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default:
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break;
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}
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reg_ax=rax;
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return CBRET_NONE;
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}
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static Bitu INT74_Handler(void) {
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if (mouse.events>0) {
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mouse.events--;
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@ -902,9 +961,23 @@ Bitu MOUSE_UserInt_CB_Handler(void) {
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void MOUSE_Init(Section* sec) {
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// Callback for mouse interrupt 0x33
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call_int33=CALLBACK_Allocate();
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CALLBACK_Setup(call_int33,&INT33_Handler,CB_IRET,"Mouse");
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RealPt i33loc=RealMake(CB_SEG+1,(call_int33*CB_SIZE)-0x10);
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// RealPt i33loc=RealMake(DOS_GetMemory(0x1)-1,0x10); // need another location
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CALLBACK_Setup(call_int33,&INT33_Handler,CB_MOUSE,Real2Phys(i33loc),"Mouse");
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// Wasteland needs low(seg(int33))!=0 and low(ofs(int33))!=0
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real_writed(0,0x33<<2,RealMake(CB_SEG+1,(call_int33*CB_SIZE)-0x10));
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real_writed(0,0x33<<2,i33loc);
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call_mouse_bd=CALLBACK_Allocate();
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CALLBACK_Setup(call_mouse_bd,&MOUSE_BD_Handler,CB_RETF8,
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PhysMake(RealSeg(i33loc),RealOff(i33loc)+2),"MouseBD");
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// pseudocode for CB_MOUSE (including the special backdoor entry point):
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// jump near i33hd
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// callback MOUSE_BD_Handler
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// retf 8
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// label i33hd:
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// callback INT33_Handler
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// iret
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// Callback for ps2 irq
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call_int74=CALLBACK_Allocate();
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