2 * QEMU PC keyboard emulation
4 * Copyright (c) 2003 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 #include "qemu/osdep.h"
26 #include "hw/isa/isa.h"
27 #include "hw/i386/pc.h"
28 #include "hw/input/ps2.h"
29 #include "hw/input/i8042.h"
30 #include "sysemu/sysemu.h"
32 /* debug PC keyboard */
35 #define DPRINTF(fmt, ...) \
36 do { printf("KBD: " fmt , ## __VA_ARGS__); } while (0)
38 #define DPRINTF(fmt, ...)
41 /* Keyboard Controller Commands */
42 #define KBD_CCMD_READ_MODE 0x20 /* Read mode bits */
43 #define KBD_CCMD_WRITE_MODE 0x60 /* Write mode bits */
44 #define KBD_CCMD_GET_VERSION 0xA1 /* Get controller version */
45 #define KBD_CCMD_MOUSE_DISABLE 0xA7 /* Disable mouse interface */
46 #define KBD_CCMD_MOUSE_ENABLE 0xA8 /* Enable mouse interface */
47 #define KBD_CCMD_TEST_MOUSE 0xA9 /* Mouse interface test */
48 #define KBD_CCMD_SELF_TEST 0xAA /* Controller self test */
49 #define KBD_CCMD_KBD_TEST 0xAB /* Keyboard interface test */
50 #define KBD_CCMD_KBD_DISABLE 0xAD /* Keyboard interface disable */
51 #define KBD_CCMD_KBD_ENABLE 0xAE /* Keyboard interface enable */
52 #define KBD_CCMD_READ_INPORT 0xC0 /* read input port */
53 #define KBD_CCMD_READ_OUTPORT 0xD0 /* read output port */
54 #define KBD_CCMD_WRITE_OUTPORT 0xD1 /* write output port */
55 #define KBD_CCMD_WRITE_OBUF 0xD2
56 #define KBD_CCMD_WRITE_AUX_OBUF 0xD3 /* Write to output buffer as if
57 initiated by the auxiliary device */
58 #define KBD_CCMD_WRITE_MOUSE 0xD4 /* Write the following byte to the mouse */
59 #define KBD_CCMD_DISABLE_A20 0xDD /* HP vectra only ? */
60 #define KBD_CCMD_ENABLE_A20 0xDF /* HP vectra only ? */
61 #define KBD_CCMD_PULSE_BITS_3_0 0xF0 /* Pulse bits 3-0 of the output port P2. */
62 #define KBD_CCMD_RESET 0xFE /* Pulse bit 0 of the output port P2 = CPU reset. */
63 #define KBD_CCMD_NO_OP 0xFF /* Pulse no bits of the output port P2. */
65 /* Keyboard Commands */
66 #define KBD_CMD_SET_LEDS 0xED /* Set keyboard leds */
67 #define KBD_CMD_ECHO 0xEE
68 #define KBD_CMD_GET_ID 0xF2 /* get keyboard ID */
69 #define KBD_CMD_SET_RATE 0xF3 /* Set typematic rate */
70 #define KBD_CMD_ENABLE 0xF4 /* Enable scanning */
71 #define KBD_CMD_RESET_DISABLE 0xF5 /* reset and disable scanning */
72 #define KBD_CMD_RESET_ENABLE 0xF6 /* reset and enable scanning */
73 #define KBD_CMD_RESET 0xFF /* Reset */
75 /* Keyboard Replies */
76 #define KBD_REPLY_POR 0xAA /* Power on reset */
77 #define KBD_REPLY_ACK 0xFA /* Command ACK */
78 #define KBD_REPLY_RESEND 0xFE /* Command NACK, send the cmd again */
80 /* Status Register Bits */
81 #define KBD_STAT_OBF 0x01 /* Keyboard output buffer full */
82 #define KBD_STAT_IBF 0x02 /* Keyboard input buffer full */
83 #define KBD_STAT_SELFTEST 0x04 /* Self test successful */
84 #define KBD_STAT_CMD 0x08 /* Last write was a command write (0=data) */
85 #define KBD_STAT_UNLOCKED 0x10 /* Zero if keyboard locked */
86 #define KBD_STAT_MOUSE_OBF 0x20 /* Mouse output buffer full */
87 #define KBD_STAT_GTO 0x40 /* General receive/xmit timeout */
88 #define KBD_STAT_PERR 0x80 /* Parity error */
90 /* Controller Mode Register Bits */
91 #define KBD_MODE_KBD_INT 0x01 /* Keyboard data generate IRQ1 */
92 #define KBD_MODE_MOUSE_INT 0x02 /* Mouse data generate IRQ12 */
93 #define KBD_MODE_SYS 0x04 /* The system flag (?) */
94 #define KBD_MODE_NO_KEYLOCK 0x08 /* The keylock doesn't affect the keyboard if set */
95 #define KBD_MODE_DISABLE_KBD 0x10 /* Disable keyboard interface */
96 #define KBD_MODE_DISABLE_MOUSE 0x20 /* Disable mouse interface */
97 #define KBD_MODE_KCC 0x40 /* Scan code conversion to PC format */
98 #define KBD_MODE_RFU 0x80
100 /* Output Port Bits */
101 #define KBD_OUT_RESET 0x01 /* 1=normal mode, 0=reset */
102 #define KBD_OUT_A20 0x02 /* x86 only */
103 #define KBD_OUT_OBF 0x10 /* Keyboard output buffer full */
104 #define KBD_OUT_MOUSE_OBF 0x20 /* Mouse output buffer full */
106 /* OSes typically write 0xdd/0xdf to turn the A20 line off and on.
107 * We make the default value of the outport include these four bits,
108 * so that the subsection is rarely necessary.
110 #define KBD_OUT_ONES 0xcc
113 #define AUX_SET_SCALE11 0xE6 /* Set 1:1 scaling */
114 #define AUX_SET_SCALE21 0xE7 /* Set 2:1 scaling */
115 #define AUX_SET_RES 0xE8 /* Set resolution */
116 #define AUX_GET_SCALE 0xE9 /* Get scaling factor */
117 #define AUX_SET_STREAM 0xEA /* Set stream mode */
118 #define AUX_POLL 0xEB /* Poll */
119 #define AUX_RESET_WRAP 0xEC /* Reset wrap mode */
120 #define AUX_SET_WRAP 0xEE /* Set wrap mode */
121 #define AUX_SET_REMOTE 0xF0 /* Set remote mode */
122 #define AUX_GET_TYPE 0xF2 /* Get type */
123 #define AUX_SET_SAMPLE 0xF3 /* Set sample rate */
124 #define AUX_ENABLE_DEV 0xF4 /* Enable aux device */
125 #define AUX_DISABLE_DEV 0xF5 /* Disable aux device */
126 #define AUX_SET_DEFAULT 0xF6
127 #define AUX_RESET 0xFF /* Reset aux device */
128 #define AUX_ACK 0xFA /* Command byte ACK. */
130 #define MOUSE_STATUS_REMOTE 0x40
131 #define MOUSE_STATUS_ENABLED 0x20
132 #define MOUSE_STATUS_SCALE21 0x10
134 #define KBD_PENDING_KBD 1
135 #define KBD_PENDING_AUX 2
137 typedef struct KBDState {
138 uint8_t write_cmd; /* if non zero, write data to port 60 is expected */
142 bool outport_present;
143 /* Bitmask of devices with data available. */
154 /* update irq and KBD_STAT_[MOUSE_]OBF */
155 /* XXX: not generating the irqs if KBD_MODE_DISABLE_KBD is set may be
156 incorrect, but it avoids having to simulate exact delays */
157 static void kbd_update_irq(KBDState *s)
159 int irq_kbd_level, irq_mouse_level;
163 s->status &= ~(KBD_STAT_OBF | KBD_STAT_MOUSE_OBF);
164 s->outport &= ~(KBD_OUT_OBF | KBD_OUT_MOUSE_OBF);
166 s->status |= KBD_STAT_OBF;
167 s->outport |= KBD_OUT_OBF;
168 /* kbd data takes priority over aux data. */
169 if (s->pending == KBD_PENDING_AUX) {
170 s->status |= KBD_STAT_MOUSE_OBF;
171 s->outport |= KBD_OUT_MOUSE_OBF;
172 if (s->mode & KBD_MODE_MOUSE_INT)
175 if ((s->mode & KBD_MODE_KBD_INT) &&
176 !(s->mode & KBD_MODE_DISABLE_KBD))
180 qemu_set_irq(s->irq_kbd, irq_kbd_level);
181 qemu_set_irq(s->irq_mouse, irq_mouse_level);
184 static void kbd_update_kbd_irq(void *opaque, int level)
186 KBDState *s = (KBDState *)opaque;
189 s->pending |= KBD_PENDING_KBD;
191 s->pending &= ~KBD_PENDING_KBD;
195 static void kbd_update_aux_irq(void *opaque, int level)
197 KBDState *s = (KBDState *)opaque;
200 s->pending |= KBD_PENDING_AUX;
202 s->pending &= ~KBD_PENDING_AUX;
206 static uint64_t kbd_read_status(void *opaque, hwaddr addr,
209 KBDState *s = opaque;
212 DPRINTF("kbd: read status=0x%02x\n", val);
216 static void kbd_queue(KBDState *s, int b, int aux)
219 ps2_queue(s->mouse, b);
221 ps2_queue(s->kbd, b);
224 static void outport_write(KBDState *s, uint32_t val)
226 DPRINTF("kbd: write outport=0x%02x\n", val);
228 qemu_set_irq(s->a20_out, (val >> 1) & 1);
230 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
234 static void kbd_write_command(void *opaque, hwaddr addr,
235 uint64_t val, unsigned size)
237 KBDState *s = opaque;
239 DPRINTF("kbd: write cmd=0x%02" PRIx64 "\n", val);
241 /* Bits 3-0 of the output port P2 of the keyboard controller may be pulsed
242 * low for approximately 6 micro seconds. Bits 3-0 of the KBD_CCMD_PULSE
243 * command specify the output port bits to be pulsed.
244 * 0: Bit should be pulsed. 1: Bit should not be modified.
245 * The only useful version of this command is pulsing bit 0,
246 * which does a CPU reset.
248 if((val & KBD_CCMD_PULSE_BITS_3_0) == KBD_CCMD_PULSE_BITS_3_0) {
250 val = KBD_CCMD_RESET;
252 val = KBD_CCMD_NO_OP;
256 case KBD_CCMD_READ_MODE:
257 kbd_queue(s, s->mode, 0);
259 case KBD_CCMD_WRITE_MODE:
260 case KBD_CCMD_WRITE_OBUF:
261 case KBD_CCMD_WRITE_AUX_OBUF:
262 case KBD_CCMD_WRITE_MOUSE:
263 case KBD_CCMD_WRITE_OUTPORT:
266 case KBD_CCMD_MOUSE_DISABLE:
267 s->mode |= KBD_MODE_DISABLE_MOUSE;
269 case KBD_CCMD_MOUSE_ENABLE:
270 s->mode &= ~KBD_MODE_DISABLE_MOUSE;
272 case KBD_CCMD_TEST_MOUSE:
273 kbd_queue(s, 0x00, 0);
275 case KBD_CCMD_SELF_TEST:
276 s->status |= KBD_STAT_SELFTEST;
277 kbd_queue(s, 0x55, 0);
279 case KBD_CCMD_KBD_TEST:
280 kbd_queue(s, 0x00, 0);
282 case KBD_CCMD_KBD_DISABLE:
283 s->mode |= KBD_MODE_DISABLE_KBD;
286 case KBD_CCMD_KBD_ENABLE:
287 s->mode &= ~KBD_MODE_DISABLE_KBD;
290 case KBD_CCMD_READ_INPORT:
291 kbd_queue(s, 0x80, 0);
293 case KBD_CCMD_READ_OUTPORT:
294 kbd_queue(s, s->outport, 0);
296 case KBD_CCMD_ENABLE_A20:
297 qemu_irq_raise(s->a20_out);
298 s->outport |= KBD_OUT_A20;
300 case KBD_CCMD_DISABLE_A20:
301 qemu_irq_lower(s->a20_out);
302 s->outport &= ~KBD_OUT_A20;
305 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
311 fprintf(stderr, "qemu: unsupported keyboard cmd=0x%02x\n", (int)val);
316 static uint64_t kbd_read_data(void *opaque, hwaddr addr,
319 KBDState *s = opaque;
322 if (s->pending == KBD_PENDING_AUX)
323 val = ps2_read_data(s->mouse);
325 val = ps2_read_data(s->kbd);
327 DPRINTF("kbd: read data=0x%02x\n", val);
331 static void kbd_write_data(void *opaque, hwaddr addr,
332 uint64_t val, unsigned size)
334 KBDState *s = opaque;
336 DPRINTF("kbd: write data=0x%02" PRIx64 "\n", val);
338 switch(s->write_cmd) {
340 ps2_write_keyboard(s->kbd, val);
342 case KBD_CCMD_WRITE_MODE:
344 ps2_keyboard_set_translation(s->kbd, (s->mode & KBD_MODE_KCC) != 0);
348 case KBD_CCMD_WRITE_OBUF:
349 kbd_queue(s, val, 0);
351 case KBD_CCMD_WRITE_AUX_OBUF:
352 kbd_queue(s, val, 1);
354 case KBD_CCMD_WRITE_OUTPORT:
355 outport_write(s, val);
357 case KBD_CCMD_WRITE_MOUSE:
358 ps2_write_mouse(s->mouse, val);
366 static void kbd_reset(void *opaque)
368 KBDState *s = opaque;
370 s->mode = KBD_MODE_KBD_INT | KBD_MODE_MOUSE_INT;
371 s->status = KBD_STAT_CMD | KBD_STAT_UNLOCKED;
372 s->outport = KBD_OUT_RESET | KBD_OUT_A20 | KBD_OUT_ONES;
373 s->outport_present = false;
376 static uint8_t kbd_outport_default(KBDState *s)
378 return KBD_OUT_RESET | KBD_OUT_A20 | KBD_OUT_ONES
379 | (s->status & KBD_STAT_OBF ? KBD_OUT_OBF : 0)
380 | (s->status & KBD_STAT_MOUSE_OBF ? KBD_OUT_MOUSE_OBF : 0);
383 static int kbd_outport_post_load(void *opaque, int version_id)
385 KBDState *s = opaque;
386 s->outport_present = true;
390 static bool kbd_outport_needed(void *opaque)
392 KBDState *s = opaque;
393 return s->outport != kbd_outport_default(s);
396 static const VMStateDescription vmstate_kbd_outport = {
397 .name = "pckbd_outport",
399 .minimum_version_id = 1,
400 .post_load = kbd_outport_post_load,
401 .needed = kbd_outport_needed,
402 .fields = (VMStateField[]) {
403 VMSTATE_UINT8(outport, KBDState),
404 VMSTATE_END_OF_LIST()
408 static int kbd_post_load(void *opaque, int version_id)
410 KBDState *s = opaque;
411 if (!s->outport_present) {
412 s->outport = kbd_outport_default(s);
414 s->outport_present = false;
418 static const VMStateDescription vmstate_kbd = {
421 .minimum_version_id = 3,
422 .post_load = kbd_post_load,
423 .fields = (VMStateField[]) {
424 VMSTATE_UINT8(write_cmd, KBDState),
425 VMSTATE_UINT8(status, KBDState),
426 VMSTATE_UINT8(mode, KBDState),
427 VMSTATE_UINT8(pending, KBDState),
428 VMSTATE_END_OF_LIST()
430 .subsections = (const VMStateDescription*[]) {
431 &vmstate_kbd_outport,
436 /* Memory mapped interface */
437 static uint32_t kbd_mm_readb (void *opaque, hwaddr addr)
439 KBDState *s = opaque;
442 return kbd_read_status(s, 0, 1) & 0xff;
444 return kbd_read_data(s, 0, 1) & 0xff;
447 static void kbd_mm_writeb (void *opaque, hwaddr addr, uint32_t value)
449 KBDState *s = opaque;
452 kbd_write_command(s, 0, value & 0xff, 1);
454 kbd_write_data(s, 0, value & 0xff, 1);
457 static const MemoryRegionOps i8042_mmio_ops = {
458 .endianness = DEVICE_NATIVE_ENDIAN,
460 .read = { kbd_mm_readb, kbd_mm_readb, kbd_mm_readb },
461 .write = { kbd_mm_writeb, kbd_mm_writeb, kbd_mm_writeb },
465 void i8042_mm_init(qemu_irq kbd_irq, qemu_irq mouse_irq,
466 MemoryRegion *region, ram_addr_t size,
469 KBDState *s = g_malloc0(sizeof(KBDState));
471 s->irq_kbd = kbd_irq;
472 s->irq_mouse = mouse_irq;
475 vmstate_register(NULL, 0, &vmstate_kbd, s);
477 memory_region_init_io(region, NULL, &i8042_mmio_ops, s, "i8042", size);
479 s->kbd = ps2_kbd_init(kbd_update_kbd_irq, s);
480 s->mouse = ps2_mouse_init(kbd_update_aux_irq, s);
481 qemu_register_reset(kbd_reset, s);
484 #define I8042(obj) OBJECT_CHECK(ISAKBDState, (obj), TYPE_I8042)
486 typedef struct ISAKBDState {
487 ISADevice parent_obj;
493 void i8042_isa_mouse_fake_event(void *opaque)
495 ISADevice *dev = opaque;
496 ISAKBDState *isa = I8042(dev);
497 KBDState *s = &isa->kbd;
499 ps2_mouse_fake_event(s->mouse);
502 void i8042_setup_a20_line(ISADevice *dev, qemu_irq a20_out)
504 qdev_connect_gpio_out_named(DEVICE(dev), I8042_A20_LINE, 0, a20_out);
507 static const VMStateDescription vmstate_kbd_isa = {
510 .minimum_version_id = 3,
511 .fields = (VMStateField[]) {
512 VMSTATE_STRUCT(kbd, ISAKBDState, 0, vmstate_kbd, KBDState),
513 VMSTATE_END_OF_LIST()
517 static const MemoryRegionOps i8042_data_ops = {
518 .read = kbd_read_data,
519 .write = kbd_write_data,
521 .min_access_size = 1,
522 .max_access_size = 1,
524 .endianness = DEVICE_LITTLE_ENDIAN,
527 static const MemoryRegionOps i8042_cmd_ops = {
528 .read = kbd_read_status,
529 .write = kbd_write_command,
531 .min_access_size = 1,
532 .max_access_size = 1,
534 .endianness = DEVICE_LITTLE_ENDIAN,
537 static void i8042_initfn(Object *obj)
539 ISAKBDState *isa_s = I8042(obj);
540 KBDState *s = &isa_s->kbd;
542 memory_region_init_io(isa_s->io + 0, obj, &i8042_data_ops, s,
544 memory_region_init_io(isa_s->io + 1, obj, &i8042_cmd_ops, s,
547 qdev_init_gpio_out_named(DEVICE(obj), &s->a20_out, I8042_A20_LINE, 1);
550 static void i8042_realizefn(DeviceState *dev, Error **errp)
552 ISADevice *isadev = ISA_DEVICE(dev);
553 ISAKBDState *isa_s = I8042(dev);
554 KBDState *s = &isa_s->kbd;
556 isa_init_irq(isadev, &s->irq_kbd, 1);
557 isa_init_irq(isadev, &s->irq_mouse, 12);
559 isa_register_ioport(isadev, isa_s->io + 0, 0x60);
560 isa_register_ioport(isadev, isa_s->io + 1, 0x64);
562 s->kbd = ps2_kbd_init(kbd_update_kbd_irq, s);
563 s->mouse = ps2_mouse_init(kbd_update_aux_irq, s);
564 qemu_register_reset(kbd_reset, s);
567 static void i8042_class_initfn(ObjectClass *klass, void *data)
569 DeviceClass *dc = DEVICE_CLASS(klass);
571 dc->realize = i8042_realizefn;
572 dc->vmsd = &vmstate_kbd_isa;
575 static const TypeInfo i8042_info = {
577 .parent = TYPE_ISA_DEVICE,
578 .instance_size = sizeof(ISAKBDState),
579 .instance_init = i8042_initfn,
580 .class_init = i8042_class_initfn,
583 static void i8042_register_types(void)
585 type_register_static(&i8042_info);
588 type_init(i8042_register_types)