hw/pckbd.c - qemu - Git at Google

 /*
  * QEMU PC keyboard emulation
  *
  * Copyright (c) 2003 Fabrice Bellard
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 #include "hw.h"
 #include "isa.h"
 #include "pc.h"
 #include "ps2.h"
 #include "sysemu.h"

 /* debug PC keyboard */
 //#define DEBUG_KBD
 #ifdef DEBUG_KBD
 #define DPRINTF(fmt, ...)                                       \
     do { printf("KBD: " fmt , ## __VA_ARGS__); } while (0)
 #else
 #define DPRINTF(fmt, ...)
 #endif

 /*	Keyboard Controller Commands */
 #define KBD_CCMD_READ_MODE	0x20	/* Read mode bits */
 #define KBD_CCMD_WRITE_MODE	0x60	/* Write mode bits */
 #define KBD_CCMD_GET_VERSION	0xA1	/* Get controller version */
 #define KBD_CCMD_MOUSE_DISABLE	0xA7	/* Disable mouse interface */
 #define KBD_CCMD_MOUSE_ENABLE	0xA8	/* Enable mouse interface */
 #define KBD_CCMD_TEST_MOUSE	0xA9	/* Mouse interface test */
 #define KBD_CCMD_SELF_TEST	0xAA	/* Controller self test */
 #define KBD_CCMD_KBD_TEST	0xAB	/* Keyboard interface test */
 #define KBD_CCMD_KBD_DISABLE	0xAD	/* Keyboard interface disable */
 #define KBD_CCMD_KBD_ENABLE	0xAE	/* Keyboard interface enable */
 #define KBD_CCMD_READ_INPORT    0xC0    /* read input port */
 #define KBD_CCMD_READ_OUTPORT	0xD0    /* read output port */
 #define KBD_CCMD_WRITE_OUTPORT	0xD1    /* write output port */
 #define KBD_CCMD_WRITE_OBUF	0xD2
 #define KBD_CCMD_WRITE_AUX_OBUF	0xD3    /* Write to output buffer as if
 					   initiated by the auxiliary device */
 #define KBD_CCMD_WRITE_MOUSE	0xD4	/* Write the following byte to the mouse */
 #define KBD_CCMD_DISABLE_A20    0xDD    /* HP vectra only ? */
 #define KBD_CCMD_ENABLE_A20     0xDF    /* HP vectra only ? */
 #define KBD_CCMD_RESET	        0xFE

 /* Keyboard Commands */
 #define KBD_CMD_SET_LEDS	0xED	/* Set keyboard leds */
 #define KBD_CMD_ECHO     	0xEE
 #define KBD_CMD_GET_ID 	        0xF2	/* get keyboard ID */
 #define KBD_CMD_SET_RATE	0xF3	/* Set typematic rate */
 #define KBD_CMD_ENABLE		0xF4	/* Enable scanning */
 #define KBD_CMD_RESET_DISABLE	0xF5	/* reset and disable scanning */
 #define KBD_CMD_RESET_ENABLE   	0xF6    /* reset and enable scanning */
 #define KBD_CMD_RESET		0xFF	/* Reset */

 /* Keyboard Replies */
 #define KBD_REPLY_POR		0xAA	/* Power on reset */
 #define KBD_REPLY_ACK		0xFA	/* Command ACK */
 #define KBD_REPLY_RESEND	0xFE	/* Command NACK, send the cmd again */

 /* Status Register Bits */
 #define KBD_STAT_OBF 		0x01	/* Keyboard output buffer full */
 #define KBD_STAT_IBF 		0x02	/* Keyboard input buffer full */
 #define KBD_STAT_SELFTEST	0x04	/* Self test successful */
 #define KBD_STAT_CMD		0x08	/* Last write was a command write (0=data) */
 #define KBD_STAT_UNLOCKED	0x10	/* Zero if keyboard locked */
 #define KBD_STAT_MOUSE_OBF	0x20	/* Mouse output buffer full */
 #define KBD_STAT_GTO 		0x40	/* General receive/xmit timeout */
 #define KBD_STAT_PERR 		0x80	/* Parity error */

 /* Controller Mode Register Bits */
 #define KBD_MODE_KBD_INT	0x01	/* Keyboard data generate IRQ1 */
 #define KBD_MODE_MOUSE_INT	0x02	/* Mouse data generate IRQ12 */
 #define KBD_MODE_SYS 		0x04	/* The system flag (?) */
 #define KBD_MODE_NO_KEYLOCK	0x08	/* The keylock doesn't affect the keyboard if set */
 #define KBD_MODE_DISABLE_KBD	0x10	/* Disable keyboard interface */
 #define KBD_MODE_DISABLE_MOUSE	0x20	/* Disable mouse interface */
 #define KBD_MODE_KCC 		0x40	/* Scan code conversion to PC format */
 #define KBD_MODE_RFU		0x80

 /* Output Port Bits */
 #define KBD_OUT_RESET           0x01    /* 1=normal mode, 0=reset */
 #define KBD_OUT_A20             0x02    /* x86 only */
 #define KBD_OUT_OBF             0x10    /* Keyboard output buffer full */
 #define KBD_OUT_MOUSE_OBF       0x20    /* Mouse output buffer full */

 /* Mouse Commands */
 #define AUX_SET_SCALE11		0xE6	/* Set 1:1 scaling */
 #define AUX_SET_SCALE21		0xE7	/* Set 2:1 scaling */
 #define AUX_SET_RES		0xE8	/* Set resolution */
 #define AUX_GET_SCALE		0xE9	/* Get scaling factor */
 #define AUX_SET_STREAM		0xEA	/* Set stream mode */
 #define AUX_POLL		0xEB	/* Poll */
 #define AUX_RESET_WRAP		0xEC	/* Reset wrap mode */
 #define AUX_SET_WRAP		0xEE	/* Set wrap mode */
 #define AUX_SET_REMOTE		0xF0	/* Set remote mode */
 #define AUX_GET_TYPE		0xF2	/* Get type */
 #define AUX_SET_SAMPLE		0xF3	/* Set sample rate */
 #define AUX_ENABLE_DEV		0xF4	/* Enable aux device */
 #define AUX_DISABLE_DEV		0xF5	/* Disable aux device */
 #define AUX_SET_DEFAULT		0xF6
 #define AUX_RESET		0xFF	/* Reset aux device */
 #define AUX_ACK			0xFA	/* Command byte ACK. */

 #define MOUSE_STATUS_REMOTE     0x40
 #define MOUSE_STATUS_ENABLED    0x20
 #define MOUSE_STATUS_SCALE21    0x10

 #define KBD_PENDING_KBD         1
 #define KBD_PENDING_AUX         2

 typedef struct KBDState {
     uint8_t write_cmd; /* if non zero, write data to port 60 is expected */
     uint8_t status;
     uint8_t mode;
     uint8_t outport;
     /* Bitmask of devices with data available.  */
     uint8_t pending;
     void *kbd;
     void *mouse;

     qemu_irq irq_kbd;
     qemu_irq irq_mouse;
     qemu_irq *a20_out;
     target_phys_addr_t mask;
 } KBDState;

 /* update irq and KBD_STAT_[MOUSE_]OBF */
 /* XXX: not generating the irqs if KBD_MODE_DISABLE_KBD is set may be
    incorrect, but it avoids having to simulate exact delays */
 static void kbd_update_irq(KBDState *s)
 {
     int irq_kbd_level, irq_mouse_level;

     irq_kbd_level = 0;
     irq_mouse_level = 0;
     s->status &= ~(KBD_STAT_OBF | KBD_STAT_MOUSE_OBF);
     s->outport &= ~(KBD_OUT_OBF | KBD_OUT_MOUSE_OBF);
     if (s->pending) {
         s->status |= KBD_STAT_OBF;
         s->outport |= KBD_OUT_OBF;
         /* kbd data takes priority over aux data.  */
         if (s->pending == KBD_PENDING_AUX) {
             s->status |= KBD_STAT_MOUSE_OBF;
             s->outport |= KBD_OUT_MOUSE_OBF;
             if (s->mode & KBD_MODE_MOUSE_INT)
                 irq_mouse_level = 1;
         } else {
             if ((s->mode & KBD_MODE_KBD_INT) &&
                 !(s->mode & KBD_MODE_DISABLE_KBD))
                 irq_kbd_level = 1;
         }
     }
     qemu_set_irq(s->irq_kbd, irq_kbd_level);
     qemu_set_irq(s->irq_mouse, irq_mouse_level);
 }

 static void kbd_update_kbd_irq(void *opaque, int level)
 {
     KBDState *s = (KBDState *)opaque;

     if (level)
         s->pending |= KBD_PENDING_KBD;
     else
         s->pending &= ~KBD_PENDING_KBD;
     kbd_update_irq(s);
 }

 static void kbd_update_aux_irq(void *opaque, int level)
 {
     KBDState *s = (KBDState *)opaque;

     if (level)
         s->pending |= KBD_PENDING_AUX;
     else
         s->pending &= ~KBD_PENDING_AUX;
     kbd_update_irq(s);
 }

 static uint32_t kbd_read_status(void *opaque, uint32_t addr)
 {
     KBDState *s = opaque;
     int val;
     val = s->status;
     DPRINTF("kbd: read status=0x%02x\n", val);
     return val;
 }

 static void kbd_queue(KBDState *s, int b, int aux)
 {
     if (aux)
         ps2_queue(s->mouse, b);
     else
         ps2_queue(s->kbd, b);
 }

 static void ioport92_write(void *opaque, uint32_t addr, uint32_t val)
 {
     KBDState *s = opaque;

     DPRINTF("kbd: write outport=0x%02x\n", val);
     s->outport = val;
     if (s->a20_out) {
         qemu_set_irq(*s->a20_out, (val >> 1) & 1);
     }
     if (!(val & 1)) {
         qemu_system_reset_request();
     }
 }

 static uint32_t ioport92_read(void *opaque, uint32_t addr)
 {
     KBDState *s = opaque;
     uint32_t ret;

     ret = s->outport;
     DPRINTF("kbd: read outport=0x%02x\n", ret);
     return ret;
 }

 static void kbd_write_command(void *opaque, uint32_t addr, uint32_t val)
 {
     KBDState *s = opaque;

     DPRINTF("kbd: write cmd=0x%02x\n", val);
     switch(val) {
     case KBD_CCMD_READ_MODE:
         kbd_queue(s, s->mode, 0);
         break;
     case KBD_CCMD_WRITE_MODE:
     case KBD_CCMD_WRITE_OBUF:
     case KBD_CCMD_WRITE_AUX_OBUF:
     case KBD_CCMD_WRITE_MOUSE:
     case KBD_CCMD_WRITE_OUTPORT:
         s->write_cmd = val;
         break;
     case KBD_CCMD_MOUSE_DISABLE:
         s->mode |= KBD_MODE_DISABLE_MOUSE;
         break;
     case KBD_CCMD_MOUSE_ENABLE:
         s->mode &= ~KBD_MODE_DISABLE_MOUSE;
         break;
     case KBD_CCMD_TEST_MOUSE:
         kbd_queue(s, 0x00, 0);
         break;
     case KBD_CCMD_SELF_TEST:
         s->status |= KBD_STAT_SELFTEST;
         kbd_queue(s, 0x55, 0);
         break;
     case KBD_CCMD_KBD_TEST:
         kbd_queue(s, 0x00, 0);
         break;
     case KBD_CCMD_KBD_DISABLE:
         s->mode |= KBD_MODE_DISABLE_KBD;
         kbd_update_irq(s);
         break;
     case KBD_CCMD_KBD_ENABLE:
         s->mode &= ~KBD_MODE_DISABLE_KBD;
         kbd_update_irq(s);
         break;
     case KBD_CCMD_READ_INPORT:
         kbd_queue(s, 0x00, 0);
         break;
     case KBD_CCMD_READ_OUTPORT:
         kbd_queue(s, s->outport, 0);
         break;
     case KBD_CCMD_ENABLE_A20:
         if (s->a20_out) {
             qemu_irq_raise(*s->a20_out);
         }
         s->outport |= KBD_OUT_A20;
         break;
     case KBD_CCMD_DISABLE_A20:
         if (s->a20_out) {
             qemu_irq_lower(*s->a20_out);
         }
         s->outport &= ~KBD_OUT_A20;
         break;
     case KBD_CCMD_RESET:
         qemu_system_reset_request();
         break;
     case 0xff:
         /* ignore that - I don't know what is its use */
         break;
     default:
         fprintf(stderr, "qemu: unsupported keyboard cmd=0x%02x\n", val);
         break;
     }
 }

 static uint32_t kbd_read_data(void *opaque, uint32_t addr)
 {
     KBDState *s = opaque;
     uint32_t val;

     if (s->pending == KBD_PENDING_AUX)
         val = ps2_read_data(s->mouse);
     else
         val = ps2_read_data(s->kbd);

     DPRINTF("kbd: read data=0x%02x\n", val);
     return val;
 }

 static void kbd_write_data(void *opaque, uint32_t addr, uint32_t val)
 {
     KBDState *s = opaque;

     DPRINTF("kbd: write data=0x%02x\n", val);

     switch(s->write_cmd) {
     case 0:
         ps2_write_keyboard(s->kbd, val);
         break;
     case KBD_CCMD_WRITE_MODE:
         s->mode = val;
         ps2_keyboard_set_translation(s->kbd, (s->mode & KBD_MODE_KCC) != 0);
         /* ??? */
         kbd_update_irq(s);
         break;
     case KBD_CCMD_WRITE_OBUF:
         kbd_queue(s, val, 0);
         break;
     case KBD_CCMD_WRITE_AUX_OBUF:
         kbd_queue(s, val, 1);
         break;
     case KBD_CCMD_WRITE_OUTPORT:
         ioport92_write(s, 0, val);
         break;
     case KBD_CCMD_WRITE_MOUSE:
         ps2_write_mouse(s->mouse, val);
         break;
     default:
         break;
     }
     s->write_cmd = 0;
 }

 static void kbd_reset(void *opaque)
 {
     KBDState *s = opaque;

     s->mode = KBD_MODE_KBD_INT | KBD_MODE_MOUSE_INT;
     s->status = KBD_STAT_CMD | KBD_STAT_UNLOCKED;
     s->outport = KBD_OUT_RESET | KBD_OUT_A20;
 }

 static const VMStateDescription vmstate_kbd = {
     .name = "pckbd",
     .version_id = 3,
     .minimum_version_id = 3,
     .minimum_version_id_old = 3,
     .fields      = (VMStateField []) {
         VMSTATE_UINT8(write_cmd, KBDState),
         VMSTATE_UINT8(status, KBDState),
         VMSTATE_UINT8(mode, KBDState),
         VMSTATE_UINT8(pending, KBDState),
         VMSTATE_END_OF_LIST()
     }
 };

 /* Memory mapped interface */
 static uint32_t kbd_mm_readb (void *opaque, target_phys_addr_t addr)
 {
     KBDState *s = opaque;

     if (addr & s->mask)
         return kbd_read_status(s, 0) & 0xff;
     else
         return kbd_read_data(s, 0) & 0xff;
 }

 static void kbd_mm_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
 {
     KBDState *s = opaque;

     if (addr & s->mask)
         kbd_write_command(s, 0, value & 0xff);
     else
         kbd_write_data(s, 0, value & 0xff);
 }

 static CPUReadMemoryFunc * const kbd_mm_read[] = {
     &kbd_mm_readb,
     &kbd_mm_readb,
     &kbd_mm_readb,
 };

 static CPUWriteMemoryFunc * const kbd_mm_write[] = {
     &kbd_mm_writeb,
     &kbd_mm_writeb,
     &kbd_mm_writeb,
 };

 void i8042_mm_init(qemu_irq kbd_irq, qemu_irq mouse_irq,
                    target_phys_addr_t base, ram_addr_t size,
                    target_phys_addr_t mask)
 {
     KBDState *s = qemu_mallocz(sizeof(KBDState));
     int s_io_memory;

     s->irq_kbd = kbd_irq;
     s->irq_mouse = mouse_irq;
     s->mask = mask;

     vmstate_register(NULL, 0, &vmstate_kbd, s);
     s_io_memory = cpu_register_io_memory(kbd_mm_read, kbd_mm_write, s);
     cpu_register_physical_memory(base, size, s_io_memory);

     s->kbd = ps2_kbd_init(kbd_update_kbd_irq, s);
     s->mouse = ps2_mouse_init(kbd_update_aux_irq, s);
     qemu_register_reset(kbd_reset, s);
 }

 typedef struct ISAKBDState {
     ISADevice dev;
     KBDState  kbd;
 } ISAKBDState;

 void i8042_isa_mouse_fake_event(void *opaque)
 {
     ISADevice *dev = opaque;
     KBDState *s = &(DO_UPCAST(ISAKBDState, dev, dev)->kbd);

     ps2_mouse_fake_event(s->mouse);
 }

 void i8042_setup_a20_line(ISADevice *dev, qemu_irq *a20_out)
 {
     KBDState *s = &(DO_UPCAST(ISAKBDState, dev, dev)->kbd);

     s->a20_out = a20_out;
 }

 static const VMStateDescription vmstate_kbd_isa = {
     .name = "pckbd",
     .version_id = 3,
     .minimum_version_id = 3,
     .minimum_version_id_old = 3,
     .fields      = (VMStateField []) {
         VMSTATE_STRUCT(kbd, ISAKBDState, 0, vmstate_kbd, KBDState),
         VMSTATE_END_OF_LIST()
     }
 };

 static int i8042_initfn(ISADevice *dev)
 {
     KBDState *s = &(DO_UPCAST(ISAKBDState, dev, dev)->kbd);

     isa_init_irq(dev, &s->irq_kbd, 1);
     isa_init_irq(dev, &s->irq_mouse, 12);

     register_ioport_read(0x60, 1, 1, kbd_read_data, s);
     register_ioport_write(0x60, 1, 1, kbd_write_data, s);
     register_ioport_read(0x64, 1, 1, kbd_read_status, s);
     register_ioport_write(0x64, 1, 1, kbd_write_command, s);
     register_ioport_read(0x92, 1, 1, ioport92_read, s);
     register_ioport_write(0x92, 1, 1, ioport92_write, s);

     s->kbd = ps2_kbd_init(kbd_update_kbd_irq, s);
     s->mouse = ps2_mouse_init(kbd_update_aux_irq, s);
     qemu_register_reset(kbd_reset, s);
     return 0;
 }

 static ISADeviceInfo i8042_info = {
     .qdev.name     = "i8042",
     .qdev.size     = sizeof(ISAKBDState),
     .qdev.vmsd     = &vmstate_kbd_isa,
     .qdev.no_user  = 1,
     .init          = i8042_initfn,
 };

 static void i8042_register(void)
 {
     isa_qdev_register(&i8042_info);
 }
 device_init(i8042_register)
	/*
	* QEMU PC keyboard emulation
	*
	* Copyright (c) 2003 Fabrice Bellard
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/
	#include "hw.h"
	#include "isa.h"
	#include "pc.h"
	#include "ps2.h"
	#include "sysemu.h"

	/* debug PC keyboard */
	//#define DEBUG_KBD
	#ifdef DEBUG_KBD
	#define DPRINTF(fmt, ...) \
	do { printf("KBD: " fmt , ## __VA_ARGS__); } while (0)
	#else
	#define DPRINTF(fmt, ...)
	#endif

	/* Keyboard Controller Commands */
	#define KBD_CCMD_READ_MODE 0x20 /* Read mode bits */
	#define KBD_CCMD_WRITE_MODE 0x60 /* Write mode bits */
	#define KBD_CCMD_GET_VERSION 0xA1 /* Get controller version */
	#define KBD_CCMD_MOUSE_DISABLE 0xA7 /* Disable mouse interface */
	#define KBD_CCMD_MOUSE_ENABLE 0xA8 /* Enable mouse interface */
	#define KBD_CCMD_TEST_MOUSE 0xA9 /* Mouse interface test */
	#define KBD_CCMD_SELF_TEST 0xAA /* Controller self test */
	#define KBD_CCMD_KBD_TEST 0xAB /* Keyboard interface test */
	#define KBD_CCMD_KBD_DISABLE 0xAD /* Keyboard interface disable */
	#define KBD_CCMD_KBD_ENABLE 0xAE /* Keyboard interface enable */
	#define KBD_CCMD_READ_INPORT 0xC0 /* read input port */
	#define KBD_CCMD_READ_OUTPORT 0xD0 /* read output port */
	#define KBD_CCMD_WRITE_OUTPORT 0xD1 /* write output port */
	#define KBD_CCMD_WRITE_OBUF 0xD2
	#define KBD_CCMD_WRITE_AUX_OBUF 0xD3 /* Write to output buffer as if
	initiated by the auxiliary device */
	#define KBD_CCMD_WRITE_MOUSE 0xD4 /* Write the following byte to the mouse */
	#define KBD_CCMD_DISABLE_A20 0xDD /* HP vectra only ? */
	#define KBD_CCMD_ENABLE_A20 0xDF /* HP vectra only ? */
	#define KBD_CCMD_RESET 0xFE

	/* Keyboard Commands */
	#define KBD_CMD_SET_LEDS 0xED /* Set keyboard leds */
	#define KBD_CMD_ECHO 0xEE
	#define KBD_CMD_GET_ID 0xF2 /* get keyboard ID */
	#define KBD_CMD_SET_RATE 0xF3 /* Set typematic rate */
	#define KBD_CMD_ENABLE 0xF4 /* Enable scanning */
	#define KBD_CMD_RESET_DISABLE 0xF5 /* reset and disable scanning */
	#define KBD_CMD_RESET_ENABLE 0xF6 /* reset and enable scanning */
	#define KBD_CMD_RESET 0xFF /* Reset */

	/* Keyboard Replies */
	#define KBD_REPLY_POR 0xAA /* Power on reset */
	#define KBD_REPLY_ACK 0xFA /* Command ACK */
	#define KBD_REPLY_RESEND 0xFE /* Command NACK, send the cmd again */

	/* Status Register Bits */
	#define KBD_STAT_OBF 0x01 /* Keyboard output buffer full */
	#define KBD_STAT_IBF 0x02 /* Keyboard input buffer full */
	#define KBD_STAT_SELFTEST 0x04 /* Self test successful */
	#define KBD_STAT_CMD 0x08 /* Last write was a command write (0=data) */
	#define KBD_STAT_UNLOCKED 0x10 /* Zero if keyboard locked */
	#define KBD_STAT_MOUSE_OBF 0x20 /* Mouse output buffer full */
	#define KBD_STAT_GTO 0x40 /* General receive/xmit timeout */
	#define KBD_STAT_PERR 0x80 /* Parity error */

	/* Controller Mode Register Bits */
	#define KBD_MODE_KBD_INT 0x01 /* Keyboard data generate IRQ1 */
	#define KBD_MODE_MOUSE_INT 0x02 /* Mouse data generate IRQ12 */
	#define KBD_MODE_SYS 0x04 /* The system flag (?) */
	#define KBD_MODE_NO_KEYLOCK 0x08 /* The keylock doesn't affect the keyboard if set */
	#define KBD_MODE_DISABLE_KBD 0x10 /* Disable keyboard interface */
	#define KBD_MODE_DISABLE_MOUSE 0x20 /* Disable mouse interface */
	#define KBD_MODE_KCC 0x40 /* Scan code conversion to PC format */
	#define KBD_MODE_RFU 0x80

	/* Output Port Bits */
	#define KBD_OUT_RESET 0x01 /* 1=normal mode, 0=reset */
	#define KBD_OUT_A20 0x02 /* x86 only */
	#define KBD_OUT_OBF 0x10 /* Keyboard output buffer full */
	#define KBD_OUT_MOUSE_OBF 0x20 /* Mouse output buffer full */

	/* Mouse Commands */
	#define AUX_SET_SCALE11 0xE6 /* Set 1:1 scaling */
	#define AUX_SET_SCALE21 0xE7 /* Set 2:1 scaling */
	#define AUX_SET_RES 0xE8 /* Set resolution */
	#define AUX_GET_SCALE 0xE9 /* Get scaling factor */
	#define AUX_SET_STREAM 0xEA /* Set stream mode */
	#define AUX_POLL 0xEB /* Poll */
	#define AUX_RESET_WRAP 0xEC /* Reset wrap mode */
	#define AUX_SET_WRAP 0xEE /* Set wrap mode */
	#define AUX_SET_REMOTE 0xF0 /* Set remote mode */
	#define AUX_GET_TYPE 0xF2 /* Get type */
	#define AUX_SET_SAMPLE 0xF3 /* Set sample rate */
	#define AUX_ENABLE_DEV 0xF4 /* Enable aux device */
	#define AUX_DISABLE_DEV 0xF5 /* Disable aux device */
	#define AUX_SET_DEFAULT 0xF6
	#define AUX_RESET 0xFF /* Reset aux device */
	#define AUX_ACK 0xFA /* Command byte ACK. */

	#define MOUSE_STATUS_REMOTE 0x40
	#define MOUSE_STATUS_ENABLED 0x20
	#define MOUSE_STATUS_SCALE21 0x10

	#define KBD_PENDING_KBD 1
	#define KBD_PENDING_AUX 2

	typedef struct KBDState {
	uint8_t write_cmd; /* if non zero, write data to port 60 is expected */
	uint8_t status;
	uint8_t mode;
	uint8_t outport;
	/* Bitmask of devices with data available. */
	uint8_t pending;
	void *kbd;
	void *mouse;

	qemu_irq irq_kbd;
	qemu_irq irq_mouse;
	qemu_irq *a20_out;
	target_phys_addr_t mask;
	} KBDState;

	/* update irq and KBD_STAT_[MOUSE_]OBF */
	/* XXX: not generating the irqs if KBD_MODE_DISABLE_KBD is set may be
	incorrect, but it avoids having to simulate exact delays */
	static void kbd_update_irq(KBDState *s)
	{
	int irq_kbd_level, irq_mouse_level;

	irq_kbd_level = 0;
	irq_mouse_level = 0;
	s->status &= ~(KBD_STAT_OBF \| KBD_STAT_MOUSE_OBF);
	s->outport &= ~(KBD_OUT_OBF \| KBD_OUT_MOUSE_OBF);
	if (s->pending) {
	s->status \|= KBD_STAT_OBF;
	s->outport \|= KBD_OUT_OBF;
	/* kbd data takes priority over aux data. */
	if (s->pending == KBD_PENDING_AUX) {
	s->status \|= KBD_STAT_MOUSE_OBF;
	s->outport \|= KBD_OUT_MOUSE_OBF;
	if (s->mode & KBD_MODE_MOUSE_INT)
	irq_mouse_level = 1;
	} else {
	if ((s->mode & KBD_MODE_KBD_INT) &&
	!(s->mode & KBD_MODE_DISABLE_KBD))
	irq_kbd_level = 1;
	}
	}
	qemu_set_irq(s->irq_kbd, irq_kbd_level);
	qemu_set_irq(s->irq_mouse, irq_mouse_level);
	}

	static void kbd_update_kbd_irq(void *opaque, int level)
	{
	KBDState s = (KBDState )opaque;

	if (level)
	s->pending \|= KBD_PENDING_KBD;
	else
	s->pending &= ~KBD_PENDING_KBD;
	kbd_update_irq(s);
	}

	static void kbd_update_aux_irq(void *opaque, int level)
	{
	KBDState s = (KBDState )opaque;

	if (level)
	s->pending \|= KBD_PENDING_AUX;
	else
	s->pending &= ~KBD_PENDING_AUX;
	kbd_update_irq(s);
	}

	static uint32_t kbd_read_status(void *opaque, uint32_t addr)
	{
	KBDState *s = opaque;
	int val;
	val = s->status;
	DPRINTF("kbd: read status=0x%02x\n", val);
	return val;
	}

	static void kbd_queue(KBDState *s, int b, int aux)
	{
	if (aux)
	ps2_queue(s->mouse, b);
	else
	ps2_queue(s->kbd, b);
	}

	static void ioport92_write(void *opaque, uint32_t addr, uint32_t val)
	{
	KBDState *s = opaque;

	DPRINTF("kbd: write outport=0x%02x\n", val);
	s->outport = val;
	if (s->a20_out) {
	qemu_set_irq(*s->a20_out, (val >> 1) & 1);
	}
	if (!(val & 1)) {
	qemu_system_reset_request();
	}
	}

	static uint32_t ioport92_read(void *opaque, uint32_t addr)
	{
	KBDState *s = opaque;
	uint32_t ret;

	ret = s->outport;
	DPRINTF("kbd: read outport=0x%02x\n", ret);
	return ret;
	}

	static void kbd_write_command(void *opaque, uint32_t addr, uint32_t val)
	{
	KBDState *s = opaque;

	DPRINTF("kbd: write cmd=0x%02x\n", val);
	switch(val) {
	case KBD_CCMD_READ_MODE:
	kbd_queue(s, s->mode, 0);
	break;
	case KBD_CCMD_WRITE_MODE:
	case KBD_CCMD_WRITE_OBUF:
	case KBD_CCMD_WRITE_AUX_OBUF:
	case KBD_CCMD_WRITE_MOUSE:
	case KBD_CCMD_WRITE_OUTPORT:
	s->write_cmd = val;
	break;
	case KBD_CCMD_MOUSE_DISABLE:
	s->mode \|= KBD_MODE_DISABLE_MOUSE;
	break;
	case KBD_CCMD_MOUSE_ENABLE:
	s->mode &= ~KBD_MODE_DISABLE_MOUSE;
	break;
	case KBD_CCMD_TEST_MOUSE:
	kbd_queue(s, 0x00, 0);
	break;
	case KBD_CCMD_SELF_TEST:
	s->status \|= KBD_STAT_SELFTEST;
	kbd_queue(s, 0x55, 0);
	break;
	case KBD_CCMD_KBD_TEST:
	kbd_queue(s, 0x00, 0);
	break;
	case KBD_CCMD_KBD_DISABLE:
	s->mode \|= KBD_MODE_DISABLE_KBD;
	kbd_update_irq(s);
	break;
	case KBD_CCMD_KBD_ENABLE:
	s->mode &= ~KBD_MODE_DISABLE_KBD;
	kbd_update_irq(s);
	break;
	case KBD_CCMD_READ_INPORT:
	kbd_queue(s, 0x00, 0);
	break;
	case KBD_CCMD_READ_OUTPORT:
	kbd_queue(s, s->outport, 0);
	break;
	case KBD_CCMD_ENABLE_A20:
	if (s->a20_out) {
	qemu_irq_raise(*s->a20_out);
	}
	s->outport \|= KBD_OUT_A20;
	break;
	case KBD_CCMD_DISABLE_A20:
	if (s->a20_out) {
	qemu_irq_lower(*s->a20_out);
	}
	s->outport &= ~KBD_OUT_A20;
	break;
	case KBD_CCMD_RESET:
	qemu_system_reset_request();
	break;
	case 0xff:
	/* ignore that - I don't know what is its use */
	break;
	default:
	fprintf(stderr, "qemu: unsupported keyboard cmd=0x%02x\n", val);
	break;
	}
	}

	static uint32_t kbd_read_data(void *opaque, uint32_t addr)
	{
	KBDState *s = opaque;
	uint32_t val;

	if (s->pending == KBD_PENDING_AUX)
	val = ps2_read_data(s->mouse);
	else
	val = ps2_read_data(s->kbd);

	DPRINTF("kbd: read data=0x%02x\n", val);
	return val;
	}

	static void kbd_write_data(void *opaque, uint32_t addr, uint32_t val)
	{
	KBDState *s = opaque;

	DPRINTF("kbd: write data=0x%02x\n", val);

	switch(s->write_cmd) {
	case 0:
	ps2_write_keyboard(s->kbd, val);
	break;
	case KBD_CCMD_WRITE_MODE:
	s->mode = val;
	ps2_keyboard_set_translation(s->kbd, (s->mode & KBD_MODE_KCC) != 0);
	/* ??? */
	kbd_update_irq(s);
	break;
	case KBD_CCMD_WRITE_OBUF:
	kbd_queue(s, val, 0);
	break;
	case KBD_CCMD_WRITE_AUX_OBUF:
	kbd_queue(s, val, 1);
	break;
	case KBD_CCMD_WRITE_OUTPORT:
	ioport92_write(s, 0, val);
	break;
	case KBD_CCMD_WRITE_MOUSE:
	ps2_write_mouse(s->mouse, val);
	break;
	default:
	break;
	}
	s->write_cmd = 0;
	}

	static void kbd_reset(void *opaque)
	{
	KBDState *s = opaque;

	s->mode = KBD_MODE_KBD_INT \| KBD_MODE_MOUSE_INT;
	s->status = KBD_STAT_CMD \| KBD_STAT_UNLOCKED;
	s->outport = KBD_OUT_RESET \| KBD_OUT_A20;
	}

	static const VMStateDescription vmstate_kbd = {
	.name = "pckbd",
	.version_id = 3,
	.minimum_version_id = 3,
	.minimum_version_id_old = 3,
	.fields = (VMStateField []) {
	VMSTATE_UINT8(write_cmd, KBDState),
	VMSTATE_UINT8(status, KBDState),
	VMSTATE_UINT8(mode, KBDState),
	VMSTATE_UINT8(pending, KBDState),
	VMSTATE_END_OF_LIST()
	}
	};

	/* Memory mapped interface */
	static uint32_t kbd_mm_readb (void *opaque, target_phys_addr_t addr)
	{
	KBDState *s = opaque;

	if (addr & s->mask)
	return kbd_read_status(s, 0) & 0xff;
	else
	return kbd_read_data(s, 0) & 0xff;
	}

	static void kbd_mm_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
	{
	KBDState *s = opaque;

	if (addr & s->mask)
	kbd_write_command(s, 0, value & 0xff);
	else
	kbd_write_data(s, 0, value & 0xff);
	}

	static CPUReadMemoryFunc * const kbd_mm_read[] = {
	&kbd_mm_readb,
	&kbd_mm_readb,
	&kbd_mm_readb,
	};

	static CPUWriteMemoryFunc * const kbd_mm_write[] = {
	&kbd_mm_writeb,
	&kbd_mm_writeb,
	&kbd_mm_writeb,
	};

	void i8042_mm_init(qemu_irq kbd_irq, qemu_irq mouse_irq,
	target_phys_addr_t base, ram_addr_t size,
	target_phys_addr_t mask)
	{
	KBDState *s = qemu_mallocz(sizeof(KBDState));
	int s_io_memory;

	s->irq_kbd = kbd_irq;
	s->irq_mouse = mouse_irq;
	s->mask = mask;

	vmstate_register(NULL, 0, &vmstate_kbd, s);
	s_io_memory = cpu_register_io_memory(kbd_mm_read, kbd_mm_write, s);
	cpu_register_physical_memory(base, size, s_io_memory);

	s->kbd = ps2_kbd_init(kbd_update_kbd_irq, s);
	s->mouse = ps2_mouse_init(kbd_update_aux_irq, s);
	qemu_register_reset(kbd_reset, s);
	}

	typedef struct ISAKBDState {
	ISADevice dev;
	KBDState kbd;
	} ISAKBDState;

	void i8042_isa_mouse_fake_event(void *opaque)
	{
	ISADevice *dev = opaque;
	KBDState *s = &(DO_UPCAST(ISAKBDState, dev, dev)->kbd);

	ps2_mouse_fake_event(s->mouse);
	}

	void i8042_setup_a20_line(ISADevice dev, qemu_irq a20_out)
	{
	KBDState *s = &(DO_UPCAST(ISAKBDState, dev, dev)->kbd);

	s->a20_out = a20_out;
	}

	static const VMStateDescription vmstate_kbd_isa = {
	.name = "pckbd",
	.version_id = 3,
	.minimum_version_id = 3,
	.minimum_version_id_old = 3,
	.fields = (VMStateField []) {
	VMSTATE_STRUCT(kbd, ISAKBDState, 0, vmstate_kbd, KBDState),
	VMSTATE_END_OF_LIST()
	}
	};

	static int i8042_initfn(ISADevice *dev)
	{
	KBDState *s = &(DO_UPCAST(ISAKBDState, dev, dev)->kbd);

	isa_init_irq(dev, &s->irq_kbd, 1);
	isa_init_irq(dev, &s->irq_mouse, 12);

	register_ioport_read(0x60, 1, 1, kbd_read_data, s);
	register_ioport_write(0x60, 1, 1, kbd_write_data, s);
	register_ioport_read(0x64, 1, 1, kbd_read_status, s);
	register_ioport_write(0x64, 1, 1, kbd_write_command, s);
	register_ioport_read(0x92, 1, 1, ioport92_read, s);
	register_ioport_write(0x92, 1, 1, ioport92_write, s);

	s->kbd = ps2_kbd_init(kbd_update_kbd_irq, s);
	s->mouse = ps2_mouse_init(kbd_update_aux_irq, s);
	qemu_register_reset(kbd_reset, s);
	return 0;
	}

	static ISADeviceInfo i8042_info = {
	.qdev.name = "i8042",
	.qdev.size = sizeof(ISAKBDState),
	.qdev.vmsd = &vmstate_kbd_isa,
	.qdev.no_user = 1,
	.init = i8042_initfn,
	};

	static void i8042_register(void)
	{
	isa_qdev_register(&i8042_info);
	}
	device_init(i8042_register)