2 * COPYRIGHT: GPL - See COPYING in the top level directory
3 * PROJECT: ReactOS Virtual DOS Machine
5 * PURPOSE: VDM Keyboard 32-bit BIOS
6 * PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
9 /* INCLUDES *******************************************************************/
15 #include "kbdbios32.h"
16 #include <bios/kbdbios.h>
20 #include "cpu/cpu.h" // for EMULATOR_FLAG_ZF
22 #include "hardware/ps2.h"
24 /* PRIVATE VARIABLES **********************************************************/
26 static BYTE BiosKeyboardMap
[256];
28 /* PRIVATE FUNCTIONS **********************************************************/
30 static BOOLEAN
BiosKbdBufferPush(WORD Data
)
32 /* Get the location of the element after the tail */
33 WORD NextElement
= Bda
->KeybdBufferTail
+ sizeof(WORD
);
35 /* Wrap it around if it's at or beyond the end */
36 if (NextElement
>= Bda
->KeybdBufferEnd
) NextElement
= Bda
->KeybdBufferStart
;
38 /* If it's full, fail */
39 if (NextElement
== Bda
->KeybdBufferHead
)
41 DPRINT1("BIOS keyboard buffer full.\n");
45 /* Put the value in the queue */
46 *((LPWORD
)((ULONG_PTR
)Bda
+ Bda
->KeybdBufferTail
)) = Data
;
47 Bda
->KeybdBufferTail
= NextElement
;
53 static BOOLEAN
BiosKbdBufferTop(LPWORD Data
)
55 /* If it's empty, fail */
56 if (Bda
->KeybdBufferHead
== Bda
->KeybdBufferTail
) return FALSE
;
58 /* Otherwise, get the value and return success */
59 *Data
= *((LPWORD
)((ULONG_PTR
)Bda
+ Bda
->KeybdBufferHead
));
64 static BOOLEAN
BiosKbdBufferPop(VOID
)
66 /* If it's empty, fail */
67 if (Bda
->KeybdBufferHead
== Bda
->KeybdBufferTail
) return FALSE
;
69 /* Remove the value from the queue */
70 Bda
->KeybdBufferHead
+= sizeof(WORD
);
72 /* Check if we are at, or have passed, the end of the buffer */
73 if (Bda
->KeybdBufferHead
>= Bda
->KeybdBufferEnd
)
75 /* Return it to the beginning */
76 Bda
->KeybdBufferHead
= Bda
->KeybdBufferStart
;
83 static WORD
BiosPeekCharacter(VOID
)
85 WORD CharacterData
= 0;
87 /* Get the key from the queue, but don't remove it */
88 if (BiosKbdBufferTop(&CharacterData
)) return CharacterData
;
92 static WORD
BiosGetCharacter(VOID
)
94 WORD CharacterData
= 0;
96 /* Check if there is a key available, and if so, remove it from the queue */
97 if (BiosKbdBufferTop(&CharacterData
)) BiosKbdBufferPop();
98 else CharacterData
= 0xFFFF;
100 return CharacterData
;
103 static VOID WINAPI
BiosKeyboardService(LPWORD Stack
)
107 /* Wait for keystroke and read */
109 /* Wait for extended keystroke and read */
110 case 0x10: // FIXME: Temporarily do the same as INT 16h, 00h
112 /* Read the character (and wait if necessary) */
113 WORD Character
= BiosGetCharacter();
115 if (Character
== 0xFFFF)
117 /* No key available. Set the handler CF to repeat the BOP */
127 /* Get keystroke status */
129 /* Get extended keystroke status */
130 case 0x11: // FIXME: Temporarily do the same as INT 16h, 01h
132 WORD Character
= BiosPeekCharacter();
134 if (Character
!= 0xFFFF)
136 /* There is a character, clear ZF and return it */
137 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_ZF
;
142 /* No character, set ZF */
143 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_ZF
;
149 /* Get shift status */
152 /* Return the lower byte of the keyboard shift status word */
153 setAL(LOBYTE(Bda
->KeybdShiftFlags
));
160 DPRINT1("BIOS Function INT 16h, AH = 0x04 is RESERVED\n");
167 /* Return 0 if success, 1 if failure */
168 setAL(BiosKbdBufferPush(getCX()) == FALSE
);
172 /* Get extended shift status */
176 * Be careful! The returned word is similar to Bda->KeybdShiftFlags
177 * but the high byte is organized differently:
178 * the bytes 2 and 3 of the high byte are not the same...
180 WORD KeybdShiftFlags
= (Bda
->KeybdShiftFlags
& 0xF3FF);
182 /* Return the extended keyboard shift status word */
183 setAX(KeybdShiftFlags
);
189 DPRINT1("BIOS Function INT 16h, AH = 0x%02X NOT IMPLEMENTED\n",
196 static VOID WINAPI
BiosKeyboardIrq(LPWORD Stack
)
198 BOOLEAN SkipScanCode
;
199 BYTE ScanCode
, VirtualKey
;
203 * Get the scan code from the PS/2 port, then call the
204 * INT 15h, AH=4Fh Keyboard Intercept function to try to
205 * translate the scan code. CF must be set before the call.
206 * In return, if CF is set we continue processing the scan code
207 * stored in AL, and if not, we skip it.
215 setAL(IOReadB(PS2_DATA_PORT
));
217 Int32Call(&BiosContext
, BIOS_MISC_INTERRUPT
);
219 /* Retrieve the modified scan code in AL */
220 SkipScanCode
= (getCF() == 0);
226 /* Check whether CF is clear. If so, skip the scan code. */
227 if (SkipScanCode
) goto Quit
;
229 /* Get the corresponding virtual key code */
230 VirtualKey
= MapVirtualKey(ScanCode
& 0x7F, MAPVK_VSC_TO_VK
);
232 /* Check if this is a key press or release */
233 if (!(ScanCode
& (1 << 7)))
235 /* Key press, set the highest bit */
236 BiosKeyboardMap
[VirtualKey
] |= (1 << 7);
245 /* For toggle keys, toggle the lowest bit in the keyboard map */
246 BiosKeyboardMap
[VirtualKey
] ^= ~(1 << 0);
258 /* Modifier keys don't go in the buffer */
266 /* If ALT isn't held down, find out which character this is */
267 if (!(Bda
->KeybdShiftFlags
& (BDA_KBDFLAG_ALT
| BDA_KBDFLAG_LALT
| BDA_KBDFLAG_RALT
)))
269 if (ToAscii(VirtualKey
, ScanCode
, BiosKeyboardMap
, &Character
, 0) == 0)
276 /* Push it onto the BIOS keyboard queue */
277 BiosKbdBufferPush(MAKEWORD(Character
, ScanCode
));
283 /* Key release, unset the highest bit */
284 BiosKeyboardMap
[VirtualKey
] &= ~(1 << 7);
287 /* Clear the keyboard flags */
288 Bda
->KeybdShiftFlags
= 0;
290 /* Set the appropriate flags based on the state */
291 if (BiosKeyboardMap
[VK_SHIFT
] & (1 << 7)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_LSHIFT
;
292 if (BiosKeyboardMap
[VK_RSHIFT
] & (1 << 7)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_RSHIFT
;
293 if (BiosKeyboardMap
[VK_LSHIFT
] & (1 << 7)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_LSHIFT
;
294 if (BiosKeyboardMap
[VK_CONTROL
] & (1 << 7)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_CTRL
;
295 if (BiosKeyboardMap
[VK_MENU
] & (1 << 7)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_ALT
;
296 if (BiosKeyboardMap
[VK_SCROLL
] & (1 << 0)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_SCROLL_ON
;
297 if (BiosKeyboardMap
[VK_NUMLOCK
] & (1 << 0)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_NUMLOCK_ON
;
298 if (BiosKeyboardMap
[VK_CAPITAL
] & (1 << 0)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_CAPSLOCK_ON
;
299 if (BiosKeyboardMap
[VK_INSERT
] & (1 << 0)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_INSERT_ON
;
300 if (BiosKeyboardMap
[VK_RMENU
] & (1 << 7)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_RALT
;
301 if (BiosKeyboardMap
[VK_LMENU
] & (1 << 7)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_LALT
;
302 if (BiosKeyboardMap
[VK_SNAPSHOT
] & (1 << 7)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_SYSRQ
;
303 if (BiosKeyboardMap
[VK_PAUSE
] & (1 << 7)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_PAUSE
;
304 if (BiosKeyboardMap
[VK_SCROLL
] & (1 << 7)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_SCROLL
;
305 if (BiosKeyboardMap
[VK_NUMLOCK
] & (1 << 7)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_NUMLOCK
;
306 if (BiosKeyboardMap
[VK_CAPITAL
] & (1 << 7)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_CAPSLOCK
;
307 if (BiosKeyboardMap
[VK_INSERT
] & (1 << 7)) Bda
->KeybdShiftFlags
|= BDA_KBDFLAG_INSERT
;
309 DPRINT("BiosKeyboardIrq - Character = 0x%X, ScanCode = 0x%X, KeybdShiftFlags = 0x%X\n",
310 Character
, ScanCode
, Bda
->KeybdShiftFlags
);
313 PicIRQComplete(Stack
);
316 /* PUBLIC FUNCTIONS ***********************************************************/
318 BOOLEAN
KbdBios32Initialize(VOID
)
320 /* Initialize the common Keyboard BIOS Support Library */
321 if (!KbdBiosInitialize()) return FALSE
;
323 /* Initialize the BDA */
324 Bda
->KeybdBufferStart
= FIELD_OFFSET(BIOS_DATA_AREA
, KeybdBuffer
);
325 Bda
->KeybdBufferEnd
= Bda
->KeybdBufferStart
+ BIOS_KBD_BUFFER_SIZE
* sizeof(WORD
);
326 Bda
->KeybdBufferHead
= Bda
->KeybdBufferTail
= Bda
->KeybdBufferStart
;
328 // FIXME: Fill the keyboard buffer with invalid values for diagnostic purposes...
329 RtlFillMemory(((LPVOID
)((ULONG_PTR
)Bda
+ Bda
->KeybdBufferStart
)),
330 BIOS_KBD_BUFFER_SIZE
* sizeof(WORD
), 'A');
333 * Register the BIOS 32-bit Interrupts:
334 * - Software vector handler
335 * - HW vector interrupt
337 RegisterBiosInt32(BIOS_KBD_INTERRUPT
, BiosKeyboardService
);
338 EnableHwIRQ(1, BiosKeyboardIrq
);
343 VOID
KbdBios32Cleanup(VOID
)
345 /* Cleanup the common Keyboard BIOS Support Library */