Archipelago » qemu

/*

 * 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_PULSE_BITS_3_0 0xF0    /* Pulse bits 3-0 of the output port P2. */

#define KBD_CCMD_RESET          0xFE    /* Pulse bit 0 of the output port P2 = CPU reset. */

#define KBD_CCMD_NO_OP          0xFF    /* Pulse no bits of the output port P2. */

/* 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);

    /* Bits 3-0 of the output port P2 of the keyboard controller may be pulsed

     * low for approximately 6 micro seconds. Bits 3-0 of the KBD_CCMD_PULSE

     * command specify the output port bits to be pulsed.

     * 0: Bit should be pulsed. 1: Bit should not be modified.

     * The only useful version of this command is pulsing bit 0,

     * which does a CPU reset.

     */

    if((val & KBD_CCMD_PULSE_BITS_3_0) == KBD_CCMD_PULSE_BITS_3_0) {

        if(!(val & 1))

            val = KBD_CCMD_RESET;

        else

            val = KBD_CCMD_NO_OP;

    }

    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 KBD_CCMD_NO_OP:

        /* ignore that */

        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)