/*
* Copyright (C) 2002-2015 The DOSBox Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "dosbox.h"
#include "callback.h"
#include "mem.h"
#include "bios.h"
#include "keyboard.h"
#include "regs.h"
#include "inout.h"
#include "dos_inc.h"
#include "SDL.h"
/* SDL by default treats numlock and scrolllock different from all other keys.
* In recent versions this can disabled by a environment variable which we set in sdlmain.cpp
* Define the following if this is the case */
#if SDL_VERSION_ATLEAST(1, 2, 14)
#define CAN_USE_LOCK 1
/* For lower versions of SDL we also use a slight hack to get the startup states of numclock and capslock right.
* The proper way is in the mapper, but the repeating key is an unwanted side effect for lower versions of SDL */
#endif
static Bitu call_int16,call_irq1,call_irq6;
/* Nice table from BOCHS i should feel bad for ripping this */
#define none 0
static struct {
Bit16u normal;
Bit16u shift;
Bit16u control;
Bit16u alt;
} scan_to_scanascii[MAX_SCAN_CODE + 1] = {
{ none, none, none, none },
{ 0x011b, 0x011b, 0x011b, 0x01f0 }, /* escape */
{ 0x0231, 0x0221, none, 0x7800 }, /* 1! */
{ 0x0332, 0x0340, 0x0300, 0x7900 }, /* 2@ */
{ 0x0433, 0x0423, none, 0x7a00 }, /* 3# */
{ 0x0534, 0x0524, none, 0x7b00 }, /* 4$ */
{ 0x0635, 0x0625, none, 0x7c00 }, /* 5% */
{ 0x0736, 0x075e, 0x071e, 0x7d00 }, /* 6^ */
{ 0x0837, 0x0826, none, 0x7e00 }, /* 7& */
{ 0x0938, 0x092a, none, 0x7f00 }, /* 8* */
{ 0x0a39, 0x0a28, none, 0x8000 }, /* 9( */
{ 0x0b30, 0x0b29, none, 0x8100 }, /* 0) */
{ 0x0c2d, 0x0c5f, 0x0c1f, 0x8200 }, /* -_ */
{ 0x0d3d, 0x0d2b, none, 0x8300 }, /* =+ */
{ 0x0e08, 0x0e08, 0x0e7f, 0x0ef0 }, /* backspace */
{ 0x0f09, 0x0f00, 0x9400, none }, /* tab */
{ 0x1071, 0x1051, 0x1011, 0x1000 }, /* Q */
{ 0x1177, 0x1157, 0x1117, 0x1100 }, /* W */
{ 0x1265, 0x1245, 0x1205, 0x1200 }, /* E */
{ 0x1372, 0x1352, 0x1312, 0x1300 }, /* R */
{ 0x1474, 0x1454, 0x1414, 0x1400 }, /* T */
{ 0x1579, 0x1559, 0x1519, 0x1500 }, /* Y */
{ 0x1675, 0x1655, 0x1615, 0x1600 }, /* U */
{ 0x1769, 0x1749, 0x1709, 0x1700 }, /* I */
{ 0x186f, 0x184f, 0x180f, 0x1800 }, /* O */
{ 0x1970, 0x1950, 0x1910, 0x1900 }, /* P */
{ 0x1a5b, 0x1a7b, 0x1a1b, 0x1af0 }, /* [{ */
{ 0x1b5d, 0x1b7d, 0x1b1d, 0x1bf0 }, /* ]} */
{ 0x1c0d, 0x1c0d, 0x1c0a, none }, /* Enter */
{ none, none, none, none }, /* L Ctrl */
{ 0x1e61, 0x1e41, 0x1e01, 0x1e00 }, /* A */
{ 0x1f73, 0x1f53, 0x1f13, 0x1f00 }, /* S */
{ 0x2064, 0x2044, 0x2004, 0x2000 }, /* D */
{ 0x2166, 0x2146, 0x2106, 0x2100 }, /* F */
{ 0x2267, 0x2247, 0x2207, 0x2200 }, /* G */
{ 0x2368, 0x2348, 0x2308, 0x2300 }, /* H */
{ 0x246a, 0x244a, 0x240a, 0x2400 }, /* J */
{ 0x256b, 0x254b, 0x250b, 0x2500 }, /* K */
{ 0x266c, 0x264c, 0x260c, 0x2600 }, /* L */
{ 0x273b, 0x273a, none, 0x27f0 }, /* ;: */
{ 0x2827, 0x2822, none, 0x28f0 }, /* '" */
{ 0x2960, 0x297e, none, 0x29f0 }, /* `~ */
{ none, none, none, none }, /* L shift */
{ 0x2b5c, 0x2b7c, 0x2b1c, 0x2bf0 }, /* |\ */
{ 0x2c7a, 0x2c5a, 0x2c1a, 0x2c00 }, /* Z */
{ 0x2d78, 0x2d58, 0x2d18, 0x2d00 }, /* X */
{ 0x2e63, 0x2e43, 0x2e03, 0x2e00 }, /* C */
{ 0x2f76, 0x2f56, 0x2f16, 0x2f00 }, /* V */
{ 0x3062, 0x3042, 0x3002, 0x3000 }, /* B */
{ 0x316e, 0x314e, 0x310e, 0x3100 }, /* N */
{ 0x326d, 0x324d, 0x320d, 0x3200 }, /* M */
{ 0x332c, 0x333c, none, 0x33f0 }, /* ,< */
{ 0x342e, 0x343e, none, 0x34f0 }, /* .> */
{ 0x352f, 0x353f, none, 0x35f0 }, /* /? */
{ none, none, none, none }, /* R Shift */
{ 0x372a, 0x372a, 0x9600, 0x37f0 }, /* * */
{ none, none, none, none }, /* L Alt */
{ 0x3920, 0x3920, 0x3920, 0x3920 }, /* space */
{ none, none, none, none }, /* caps lock */
{ 0x3b00, 0x5400, 0x5e00, 0x6800 }, /* F1 */
{ 0x3c00, 0x5500, 0x5f00, 0x6900 }, /* F2 */
{ 0x3d00, 0x5600, 0x6000, 0x6a00 }, /* F3 */
{ 0x3e00, 0x5700, 0x6100, 0x6b00 }, /* F4 */
{ 0x3f00, 0x5800, 0x6200, 0x6c00 }, /* F5 */
{ 0x4000, 0x5900, 0x6300, 0x6d00 }, /* F6 */
{ 0x4100, 0x5a00, 0x6400, 0x6e00 }, /* F7 */
{ 0x4200, 0x5b00, 0x6500, 0x6f00 }, /* F8 */
{ 0x4300, 0x5c00, 0x6600, 0x7000 }, /* F9 */
{ 0x4400, 0x5d00, 0x6700, 0x7100 }, /* F10 */
{ none, none, none, none }, /* Num Lock */
{ none, none, none, none }, /* Scroll Lock */
{ 0x4700, 0x4737, 0x7700, 0x0007 }, /* 7 Home */
{ 0x4800, 0x4838, 0x8d00, 0x0008 }, /* 8 UP */
{ 0x4900, 0x4939, 0x8400, 0x0009 }, /* 9 PgUp */
{ 0x4a2d, 0x4a2d, 0x8e00, 0x4af0 }, /* - */
{ 0x4b00, 0x4b34, 0x7300, 0x0004 }, /* 4 Left */
{ 0x4cf0, 0x4c35, 0x8f00, 0x0005 }, /* 5 */
{ 0x4d00, 0x4d36, 0x7400, 0x0006 }, /* 6 Right */
{ 0x4e2b, 0x4e2b, 0x9000, 0x4ef0 }, /* + */
{ 0x4f00, 0x4f31, 0x7500, 0x0001 }, /* 1 End */
{ 0x5000, 0x5032, 0x9100, 0x0002 }, /* 2 Down */
{ 0x5100, 0x5133, 0x7600, 0x0003 }, /* 3 PgDn */
{ 0x5200, 0x5230, 0x9200, 0x0000 }, /* 0 Ins */
{ 0x5300, 0x532e, 0x9300, none }, /* Del */
{ none, none, none, none },
{ none, none, none, none },
{ 0x565c, 0x567c, none, none }, /* (102-key) */
{ 0x8500, 0x8700, 0x8900, 0x8b00 }, /* F11 */
{ 0x8600, 0x8800, 0x8a00, 0x8c00 } /* F12 */
};
bool BIOS_AddKeyToBuffer(Bit16u code) {
if (mem_readb(BIOS_KEYBOARD_FLAGS2)&8) return true;
Bit16u start,end,head,tail,ttail;
if (machine==MCH_PCJR) {
/* should be done for cga and others as well, to be tested */
start=0x1e;
end=0x3e;
} else {
start=mem_readw(BIOS_KEYBOARD_BUFFER_START);
end =mem_readw(BIOS_KEYBOARD_BUFFER_END);
}
head =mem_readw(BIOS_KEYBOARD_BUFFER_HEAD);
tail =mem_readw(BIOS_KEYBOARD_BUFFER_TAIL);
ttail=tail+2;
if (ttail>=end) {
ttail=start;
}
/* Check for buffer Full */
//TODO Maybe beeeeeeep or something although that should happend when internal buffer is full
if (ttail==head) return false;
real_writew(0x40,tail,code);
mem_writew(BIOS_KEYBOARD_BUFFER_TAIL,ttail);
return true;
}
static void add_key(Bit16u code) {
if (code!=0) BIOS_AddKeyToBuffer(code);
}
static bool get_key(Bit16u &code) {
Bit16u start,end,head,tail,thead;
if (machine==MCH_PCJR) {
/* should be done for cga and others as well, to be tested */
start=0x1e;
end=0x3e;
} else {
start=mem_readw(BIOS_KEYBOARD_BUFFER_START);
end =mem_readw(BIOS_KEYBOARD_BUFFER_END);
}
head =mem_readw(BIOS_KEYBOARD_BUFFER_HEAD);
tail =mem_readw(BIOS_KEYBOARD_BUFFER_TAIL);
if (head==tail) return false;
thead=head+2;
if (thead>=end) thead=start;
mem_writew(BIOS_KEYBOARD_BUFFER_HEAD,thead);
code = real_readw(0x40,head);
return true;
}
static bool check_key(Bit16u &code) {
Bit16u head,tail;
head =mem_readw(BIOS_KEYBOARD_BUFFER_HEAD);
tail =mem_readw(BIOS_KEYBOARD_BUFFER_TAIL);
if (head==tail) return false;
code = real_readw(0x40,head);
return true;
}
/* Flag Byte 1
bit 7 =1 INSert active
bit 6 =1 Caps Lock active
bit 5 =1 Num Lock active
bit 4 =1 Scroll Lock active
bit 3 =1 either Alt pressed
bit 2 =1 either Ctrl pressed
bit 1 =1 Left Shift pressed
bit 0 =1 Right Shift pressed
*/
/* Flag Byte 2
bit 7 =1 INSert pressed
bit 6 =1 Caps Lock pressed
bit 5 =1 Num Lock pressed
bit 4 =1 Scroll Lock pressed
bit 3 =1 Pause state active
bit 2 =1 Sys Req pressed
bit 1 =1 Left Alt pressed
bit 0 =1 Left Ctrl pressed
*/
/*
Keyboard status byte 3
bit 7 =1 read-ID in progress
bit 6 =1 last code read was first of two ID codes
bit 5 =1 force Num Lock if read-ID and enhanced keyboard
bit 4 =1 enhanced keyboard installed
bit 3 =1 Right Alt pressed
bit 2 =1 Right Ctrl pressed
bit 1 =1 last code read was E0h
bit 0 =1 last code read was E1h
*/
/* the scancode is in reg_al */
static Bitu IRQ1_Handler(void) {
/* handling of the locks key is difficult as sdl only gives
* states for numlock capslock.
*/
Bitu scancode=reg_al; /* Read the code */
Bit8u flags1,flags2,flags3,leds;
flags1=mem_readb(BIOS_KEYBOARD_FLAGS1);
flags2=mem_readb(BIOS_KEYBOARD_FLAGS2);
flags3=mem_readb(BIOS_KEYBOARD_FLAGS3);
leds =mem_readb(BIOS_KEYBOARD_LEDS);
#ifdef CAN_USE_LOCK
/* No hack anymore! */
#else
flags2&=~(0x40+0x20);//remove numlock/capslock pressed (hack for sdl only reporting states)
#endif
if (DOS_LayoutKey(scancode,flags1,flags2,flags3)) return CBRET_NONE;
//LOG_MSG("key input %d %d %d %d",scancode,flags1,flags2,flags3);
switch (scancode) {
/* First the hard ones */
case 0xfa: /* ack. Do nothing for now */
break;
case 0xe1: /* Extended key special. Only pause uses this */
flags3 |=0x01;
break;
case 0xe0: /* Extended key */
flags3 |=0x02;
break;
case 0x1d: /* Ctrl Pressed */
if (!(flags3 &0x01)) {
flags1 |=0x04;
if (flags3 &0x02) flags3 |=0x04;
else flags2 |=0x01;
} /* else it's part of the pause scancodes */
break;
case 0x9d: /* Ctrl Released */
if (!(flags3 &0x01)) {
if (flags3 &0x02) flags3 &=~0x04;
else flags2 &=~0x01;
if( !( (flags3 &0x04) || (flags2 &0x01) ) ) flags1 &=~0x04;
}
break;
case 0x2a: /* Left Shift Pressed */
flags1 |=0x02;
break;
case 0xaa: /* Left Shift Released */
flags1 &=~0x02;
break;
case 0x36: /* Right Shift Pressed */
flags1 |=0x01;
break;
case 0xb6: /* Right Shift Released */
flags1 &=~0x01;
break;
case 0x37: /* Keypad * or PrtSc Pressed */
if (!(flags3 &0x02)) goto normal_key;
reg_ip+=7; // call int 5
break;
case 0xb7: /* Keypad * or PrtSc Released */
if (!(flags3 &0x02)) goto normal_key;
break;
case 0x38: /* Alt Pressed */
flags1 |=0x08;
if (flags3 &0x02) flags3 |=0x08;
else flags2 |=0x02;
break;
case 0xb8: /* Alt Released */
if (flags3 &0x02) flags3 &= ~0x08;
else flags2 &= ~0x02;
if( !( (flags3 &0x08) || (flags2 &0x02) ) ) { /* Both alt released */
flags1 &= ~0x08;
Bit16u token =mem_readb(BIOS_KEYBOARD_TOKEN);
if(token != 0){
add_key(token);
mem_writeb(BIOS_KEYBOARD_TOKEN,0);
}
}
break;
#ifdef CAN_USE_LOCK
case 0x3a:flags2 |=0x40;break;//CAPSLOCK
case 0xba:flags1 ^=0x40;flags2 &=~0x40;leds ^=0x04;break;
#else
case 0x3a:flags2 |=0x40;flags1 |=0x40;leds |=0x04;break; //SDL gives only the state instead of the toggle /* Caps Lock */
case 0xba:flags1 &=~0x40;leds &=~0x04;break;
#endif
case 0x45:
if (flags3 &0x01) {
/* last scancode of pause received; first remove 0xe1-prefix */
flags3 &=~0x01;
mem_writeb(BIOS_KEYBOARD_FLAGS3,flags3);
if (flags2&1) {
/* ctrl-pause (break), special handling needed:
add zero to the keyboard buffer, call int 0x1b which
sets ctrl-c flag which calls int 0x23 in certain dos
input/output functions; not handled */
} else if ((flags2&8)==0) {
/* normal pause key, enter loop */
mem_writeb(BIOS_KEYBOARD_FLAGS2,flags2|8);
IO_Write(0x20,0x20);
while (mem_readb(BIOS_KEYBOARD_FLAGS2)&8) CALLBACK_Idle(); // pause loop
reg_ip+=5; // skip out 20,20
return CBRET_NONE;
}
} else {
/* Num Lock */
#ifdef CAN_USE_LOCK
flags2 |=0x20;
#else
flags2 |=0x20;
flags1 |=0x20;
leds |=0x02;
#endif
}
break;
case 0xc5:
if (flags3 &0x01) {
/* pause released */
flags3 &=~0x01;
} else {
#ifdef CAN_USE_LOCK
flags1^=0x20;
leds^=0x02;
flags2&=~0x20;
#else
/* Num Lock released */
flags1 &=~0x20;
leds &=~0x02;
#endif
}
break;
case 0x46:flags2 |=0x10;break; /* Scroll Lock SDL Seems to do this one fine (so break and make codes) */
case 0xc6:flags1 ^=0x10;flags2 &=~0x10;leds ^=0x01;break;
// case 0x52:flags2|=128;break;//See numpad /* Insert */
case 0xd2:
if(flags3&0x02) { /* Maybe honour the insert on keypad as well */
flags1^=0x80;
flags2&=~0x80;
break;
} else {
goto irq1_end;/*Normal release*/
}
case 0x47: /* Numpad */
case 0x48:
case 0x49:
case 0x4b:
case 0x4c:
case 0x4d:
case 0x4f:
case 0x50:
case 0x51:
case 0x52:
case 0x53: /* del . Not entirely correct, but works fine */
if(flags3 &0x02) { /*extend key. e.g key above arrows or arrows*/
if(scancode == 0x52) flags2 |=0x80; /* press insert */
if(flags1 &0x08) {
add_key(scan_to_scanascii[scancode].normal+0x5000);
} else if (flags1 &0x04) {
add_key((scan_to_scanascii[scancode].control&0xff00)|0xe0);
} else if( ((flags1 &0x3) != 0) || ((flags1 &0x20) != 0) ) { //Due to |0xe0 results are identical.
add_key((scan_to_scanascii[scancode].shift&0xff00)|0xe0);
} else add_key((scan_to_scanascii[scancode].normal&0xff00)|0xe0);
break;
}
if(flags1 &0x08) {
Bit8u token = mem_readb(BIOS_KEYBOARD_TOKEN);
token = token*10 + (Bit8u)(scan_to_scanascii[scancode].alt&0xff);
mem_writeb(BIOS_KEYBOARD_TOKEN,token);
} else if (flags1 &0x04) {
add_key(scan_to_scanascii[scancode].control);
} else if( ((flags1 &0x3) != 0) ^ ((flags1 &0x20) != 0) ) { //Xor shift and numlock (both means off)
add_key(scan_to_scanascii[scancode].shift);
} else add_key(scan_to_scanascii[scancode].normal);
break;
default: /* Normal Key */
normal_key:
Bit16u asciiscan;
/* Now Handle the releasing of keys and see if they match up for a code */
/* Handle the actual scancode */
if (scancode & 0x80) goto irq1_end;
if (scancode > MAX_SCAN_CODE) goto irq1_end;
if (flags1 & 0x08) { /* Alt is being pressed */
asciiscan=scan_to_scanascii[scancode].alt;
#if 0 /* old unicode support disabled*/
} else if (ascii) {
asciiscan=(scancode << 8) | ascii;
#endif
} else if (flags1 & 0x04) { /* Ctrl is being pressed */
asciiscan=scan_to_scanascii[scancode].control;
} else if (flags1 & 0x03) { /* Either shift is being pressed */
asciiscan=scan_to_scanascii[scancode].shift;
} else {
asciiscan=scan_to_scanascii[scancode].normal;
}
/* cancel shift is letter and capslock active */
if(flags1&64) {
if(flags1&3) {
/*cancel shift */
if(((asciiscan&0x00ff) >0x40) && ((asciiscan&0x00ff) <0x5b))
asciiscan=scan_to_scanascii[scancode].normal;
} else {
/* add shift */
if(((asciiscan&0x00ff) >0x60) && ((asciiscan&0x00ff) <0x7b))
asciiscan=scan_to_scanascii[scancode].shift;
}
}
if (flags3 &0x02) {
/* extended key (numblock), return and slash need special handling */
if (scancode==0x1c) { /* return */
if (flags1 &0x08) asciiscan=0xa600;
else asciiscan=(asciiscan&0xff)|0xe000;
} else if (scancode==0x35) { /* slash */
if (flags1 &0x08) asciiscan=0xa400;
else if (flags1 &0x04) asciiscan=0x9500;
else asciiscan=0xe02f;
}
}
add_key(asciiscan);
break;
};
irq1_end:
if(scancode !=0xe0) flags3 &=~0x02; //Reset 0xE0 Flag
mem_writeb(BIOS_KEYBOARD_FLAGS1,flags1);
if ((scancode&0x80)==0) flags2&=0xf7;
mem_writeb(BIOS_KEYBOARD_FLAGS2,flags2);
mem_writeb(BIOS_KEYBOARD_FLAGS3,flags3);
mem_writeb(BIOS_KEYBOARD_LEDS,leds);
/* IO_Write(0x20,0x20); moved out of handler to be virtualizable */
#if 0
/* Signal the keyboard for next code */
/* In dosbox port 60 reads do this as well */
Bit8u old61=IO_Read(0x61);
IO_Write(0x61,old61 | 128);
IO_Write(0x64,0xae);
#endif
return CBRET_NONE;
}
/* check whether key combination is enhanced or not,
translate key if necessary */
static bool IsEnhancedKey(Bit16u &key) {
/* test for special keys (return and slash on numblock) */
if ((key>>8)==0xe0) {
if (((key&0xff)==0x0a) || ((key&0xff)==0x0d)) {
/* key is return on the numblock */
key=(key&0xff)|0x1c00;
} else {
/* key is slash on the numblock */
key=(key&0xff)|0x3500;
}
/* both keys are not considered enhanced keys */
return false;
} else if (((key>>8)>0x84) || (((key&0xff)==0xf0) && (key>>8))) {
/* key is enhanced key (either scancode part>0x84 or
specially-marked keyboard combination, low part==0xf0) */
return true;
}
/* convert key if necessary (extended keys) */
if ((key>>8) && ((key&0xff)==0xe0)) {
key&=0xff00;
}
return false;
}
static Bitu INT16_Handler(void) {
Bit16u temp=0;
switch (reg_ah) {
case 0x00: /* GET KEYSTROKE */
if ((get_key(temp)) && (!IsEnhancedKey(temp))) {
/* normal key found, return translated key in ax */
reg_ax=temp;
} else {
/* enter small idle loop to allow for irqs to happen */
reg_ip+=1;
}
break;
case 0x10: /* GET KEYSTROKE (enhanced keyboards only) */
if (get_key(temp)) {
if (((temp&0xff)==0xf0) && (temp>>8)) {
/* special enhanced key, clear low part before returning key */
temp&=0xff00;
}
reg_ax=temp;
} else {
/* enter small idle loop to allow for irqs to happen */
reg_ip+=1;
}
break;
case 0x01: /* CHECK FOR KEYSTROKE */
// enable interrupt-flag after IRET of this int16
CALLBACK_SIF(true);
for (;;) {
if (check_key(temp)) {
if (!IsEnhancedKey(temp)) {
/* normal key, return translated key in ax */
CALLBACK_SZF(false);
reg_ax=temp;
break;
} else {
/* remove enhanced key from buffer and ignore it */
get_key(temp);
}
} else {
/* no key available */
CALLBACK_SZF(true);
break;
}
// CALLBACK_Idle();
}
break;
case 0x11: /* CHECK FOR KEYSTROKE (enhanced keyboards only) */
// enable interrupt-flag after IRET of this int16
CALLBACK_SIF(true);
if (!check_key(temp)) {
CALLBACK_SZF(true);
} else {
CALLBACK_SZF(false);
if (((temp&0xff)==0xf0) && (temp>>8)) {
/* special enhanced key, clear low part before returning key */
temp&=0xff00;
}
reg_ax=temp;
}
break;
case 0x02: /* GET SHIFT FLAGS */
reg_al=mem_readb(BIOS_KEYBOARD_FLAGS1);
break;
case 0x03: /* SET TYPEMATIC RATE AND DELAY */
if (reg_al == 0x00) { // set default delay and rate
IO_Write(0x60,0xf3);
IO_Write(0x60,0x20); // 500 msec delay, 30 cps
} else if (reg_al == 0x05) { // set repeat rate and delay
IO_Write(0x60,0xf3);
IO_Write(0x60,(reg_bh&3)<<5|(reg_bl&0x1f));
} else {
LOG(LOG_BIOS,LOG_ERROR)("INT16:Unhandled Typematic Rate Call %2X BX=%X",reg_al,reg_bx);
}
break;
case 0x05: /* STORE KEYSTROKE IN KEYBOARD BUFFER */
if (BIOS_AddKeyToBuffer(reg_cx)) reg_al=0;
else reg_al=1;
break;
case 0x12: /* GET EXTENDED SHIFT STATES */
reg_al = mem_readb(BIOS_KEYBOARD_FLAGS1);
reg_ah = (mem_readb(BIOS_KEYBOARD_FLAGS2)&0x73) |
((mem_readb(BIOS_KEYBOARD_FLAGS2)&4)<<5) | // SysReq pressed, bit 7
(mem_readb(BIOS_KEYBOARD_FLAGS3)&0x0c); // Right Ctrl/Alt pressed, bits 2,3
break;
case 0x55:
/* Weird call used by some dos apps */
LOG(LOG_BIOS,LOG_NORMAL)("INT16:55:Word TSR compatible call");
break;
default:
LOG(LOG_BIOS,LOG_ERROR)("INT16:Unhandled call %02X",reg_ah);
break;
};
return CBRET_NONE;
}
//Keyboard initialisation. src/gui/sdlmain.cpp
extern bool startup_state_numlock;
extern bool startup_state_capslock;
static void InitBiosSegment(void) {
/* Setup the variables for keyboard in the bios data segment */
mem_writew(BIOS_KEYBOARD_BUFFER_START,0x1e);
mem_writew(BIOS_KEYBOARD_BUFFER_END,0x3e);
mem_writew(BIOS_KEYBOARD_BUFFER_HEAD,0x1e);
mem_writew(BIOS_KEYBOARD_BUFFER_TAIL,0x1e);
Bit8u flag1 = 0;
Bit8u leds = 16; /* Ack received */
#if SDL_VERSION_ATLEAST(1, 2, 14)
//Nothing, mapper handles all.
#else
if (startup_state_capslock) { flag1|=0x40; leds|=0x04;}
if (startup_state_numlock) { flag1|=0x20; leds|=0x02;}
#endif
mem_writeb(BIOS_KEYBOARD_FLAGS1,flag1);
mem_writeb(BIOS_KEYBOARD_FLAGS2,0);
mem_writeb(BIOS_KEYBOARD_FLAGS3,16); /* Enhanced keyboard installed */
mem_writeb(BIOS_KEYBOARD_TOKEN,0);
mem_writeb(BIOS_KEYBOARD_LEDS,leds);
}
void BIOS_SetupKeyboard(void) {
/* Init the variables */
InitBiosSegment();
/* Allocate/setup a callback for int 0x16 and for standard IRQ 1 handler */
call_int16=CALLBACK_Allocate();
CALLBACK_Setup(call_int16,&INT16_Handler,CB_INT16,"Keyboard");
RealSetVec(0x16,CALLBACK_RealPointer(call_int16));
call_irq1=CALLBACK_Allocate();
CALLBACK_Setup(call_irq1,&IRQ1_Handler,CB_IRQ1,Real2Phys(BIOS_DEFAULT_IRQ1_LOCATION),"IRQ 1 Keyboard");
RealSetVec(0x09,BIOS_DEFAULT_IRQ1_LOCATION);
// pseudocode for CB_IRQ1:
// push ax
// in al, 0x60
// mov ah, 0x4f
// stc
// int 15
// jc skip
// callback IRQ1_Handler
// label skip:
// cli
// mov al, 0x20
// out 0x20, al
// pop ax
// iret
// cli
// mov al, 0x20
// out 0x20, al
// push bp
// int 0x05
// pop bp
// pop ax
// iret
if (machine==MCH_PCJR) {
call_irq6=CALLBACK_Allocate();
CALLBACK_Setup(call_irq6,NULL,CB_IRQ6_PCJR,"PCJr kb irq");
RealSetVec(0x0e,CALLBACK_RealPointer(call_irq6));
// pseudocode for CB_IRQ6_PCJR:
// push ax
// in al, 0x60
// cmp al, 0xe0
// je skip
// push ds
// push 0x40
// pop ds
// int 0x09
// pop ds
// label skip:
// cli
// mov al, 0x20
// out 0x20, al
// pop ax
// iret
}
}
