slavio_serial.c

xen虚拟机源代码安装包

                    clr_txint(s);
		break;
	    default:
		break;
	    }
	    break;
        case 1 ... 3:
        case 6 ... 8:
        case 10 ... 11:
        case 14 ... 15:
	    s->wregs[s->reg] = val;
	    break;
        case 4:
        case 5:
        case 12:
        case 13:
	    s->wregs[s->reg] = val;
            slavio_serial_update_parameters(s);
	    break;
	case 9:
	    switch (val & 0xc0) {
	    case 0:
	    default:
		break;
	    case 0x40:
		slavio_serial_reset_chn(&ser->chn[1]);
		return;
	    case 0x80:
		slavio_serial_reset_chn(&ser->chn[0]);
		return;
	    case 0xc0:
		slavio_serial_reset(ser);
		return;
	    }
	    break;
	default:
	    break;
	}
	if (s->reg == 0)
	    s->reg = newreg;
	else
	    s->reg = 0;
	break;
    case 1:
	SER_DPRINTF("Write channel %c, ch %d\n", CHN_C(s), val);
	if (s->wregs[5] & 8) { // tx enabled
	    s->tx = val;
	    if (s->chr)
		qemu_chr_write(s->chr, &s->tx, 1);
	    else if (s->type == kbd) {
		handle_kbd_command(s, val);
	    }
	    s->rregs[0] |= 4; // Tx buffer empty
	    s->rregs[1] |= 1; // All sent
            set_txint(s);
	}
	break;
    default:
	break;
    }
}

static uint32_t slavio_serial_mem_readb(void *opaque, target_phys_addr_t addr)
{
    SerialState *ser = opaque;
    ChannelState *s;
    uint32_t saddr;
    uint32_t ret;
    int channel;

    saddr = (addr & 3) >> 1;
    channel = (addr & SERIAL_MAXADDR) >> 2;
    s = &ser->chn[channel];
    switch (saddr) {
    case 0:
	SER_DPRINTF("Read channel %c, reg[%d] = %2.2x\n", CHN_C(s), s->reg, s->rregs[s->reg]);
	ret = s->rregs[s->reg];
	s->reg = 0;
	return ret;
    case 1:
	s->rregs[0] &= ~1;
        clr_rxint(s);
	if (s->type == kbd || s->type == mouse)
	    ret = get_queue(s);
	else
	    ret = s->rx;
	SER_DPRINTF("Read channel %c, ch %d\n", CHN_C(s), ret);
	return ret;
    default:
	break;
    }
    return 0;
}

static int serial_can_receive(void *opaque)
{
    ChannelState *s = opaque;
    int ret;

    if (((s->wregs[3] & 1) == 0) // Rx not enabled
	|| ((s->rregs[0] & 1) == 1)) // char already available
	ret = 0;
    else
	ret = 1;
    //SER_DPRINTF("channel %c can receive %d\n", CHN_C(s), ret);
    return ret;
}

static void serial_receive_byte(ChannelState *s, int ch)
{
    SER_DPRINTF("channel %c put ch %d\n", CHN_C(s), ch);
    s->rregs[0] |= 1;
    s->rx = ch;
    set_rxint(s);
}

static void serial_receive_break(ChannelState *s)
{
    s->rregs[0] |= 0x80;
    slavio_serial_update_irq(s);
}

static void serial_receive1(void *opaque, const uint8_t *buf, int size)
{
    ChannelState *s = opaque;
    serial_receive_byte(s, buf[0]);
}

static void serial_event(void *opaque, int event)
{
    ChannelState *s = opaque;
    if (event == CHR_EVENT_BREAK)
        serial_receive_break(s);
}

static CPUReadMemoryFunc *slavio_serial_mem_read[3] = {
    slavio_serial_mem_readb,
    slavio_serial_mem_readb,
    slavio_serial_mem_readb,
};

static CPUWriteMemoryFunc *slavio_serial_mem_write[3] = {
    slavio_serial_mem_writeb,
    slavio_serial_mem_writeb,
    slavio_serial_mem_writeb,
};

static void slavio_serial_save_chn(QEMUFile *f, ChannelState *s)
{
    qemu_put_be32s(f, &s->irq);
    qemu_put_be32s(f, &s->reg);
    qemu_put_be32s(f, &s->rxint);
    qemu_put_be32s(f, &s->txint);
    qemu_put_be32s(f, &s->rxint_under_svc);
    qemu_put_be32s(f, &s->txint_under_svc);
    qemu_put_8s(f, &s->rx);
    qemu_put_8s(f, &s->tx);
    qemu_put_buffer(f, s->wregs, 16);
    qemu_put_buffer(f, s->rregs, 16);
}

static void slavio_serial_save(QEMUFile *f, void *opaque)
{
    SerialState *s = opaque;

    slavio_serial_save_chn(f, &s->chn[0]);
    slavio_serial_save_chn(f, &s->chn[1]);
}

static int slavio_serial_load_chn(QEMUFile *f, ChannelState *s, int version_id)
{
    if (version_id > 2)
        return -EINVAL;

    qemu_get_be32s(f, &s->irq);
    qemu_get_be32s(f, &s->reg);
    qemu_get_be32s(f, &s->rxint);
    qemu_get_be32s(f, &s->txint);
    if (version_id >= 2) {
        qemu_get_be32s(f, &s->rxint_under_svc);
        qemu_get_be32s(f, &s->txint_under_svc);
    }
    qemu_get_8s(f, &s->rx);
    qemu_get_8s(f, &s->tx);
    qemu_get_buffer(f, s->wregs, 16);
    qemu_get_buffer(f, s->rregs, 16);
    return 0;
}

static int slavio_serial_load(QEMUFile *f, void *opaque, int version_id)
{
    SerialState *s = opaque;
    int ret;

    ret = slavio_serial_load_chn(f, &s->chn[0], version_id);
    if (ret != 0)
	return ret;
    ret = slavio_serial_load_chn(f, &s->chn[1], version_id);
    return ret;

}

SerialState *slavio_serial_init(int base, int irq, CharDriverState *chr1, CharDriverState *chr2)
{
    int slavio_serial_io_memory, i;
    SerialState *s;

    s = qemu_mallocz(sizeof(SerialState));
    if (!s)
        return NULL;

    slavio_serial_io_memory = cpu_register_io_memory(0, slavio_serial_mem_read, slavio_serial_mem_write, s);
    cpu_register_physical_memory(base, SERIAL_MAXADDR, slavio_serial_io_memory);

    s->chn[0].chr = chr1;
    s->chn[1].chr = chr2;

    for (i = 0; i < 2; i++) {
	s->chn[i].irq = irq;
	s->chn[i].chn = 1 - i;
	s->chn[i].type = ser;
	if (s->chn[i].chr) {
	    qemu_chr_add_handlers(s->chn[i].chr, serial_can_receive,
                                  serial_receive1, serial_event, &s->chn[i]);
	}
    }
    s->chn[0].otherchn = &s->chn[1];
    s->chn[1].otherchn = &s->chn[0];
    register_savevm("slavio_serial", base, 2, slavio_serial_save, slavio_serial_load, s);
    qemu_register_reset(slavio_serial_reset, s);
    slavio_serial_reset(s);
    return s;
}

static const uint8_t keycodes[128] = {
    127, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 43, 53,
    54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 89, 76, 77, 78,
    79, 80, 81, 82, 83, 84, 85, 86, 87, 42, 99, 88, 100, 101, 102, 103,
    104, 105, 106, 107, 108, 109, 110, 47, 19, 121, 119, 5, 6, 8, 10, 12,
    14, 16, 17, 18, 7, 98, 23, 68, 69, 70, 71, 91, 92, 93, 125, 112,
    113, 114, 94, 50, 0, 0, 124, 9, 11, 0, 0, 0, 0, 0, 0, 0,
    90, 0, 46, 22, 13, 111, 52, 20, 96, 24, 28, 74, 27, 123, 44, 66,
    0, 45, 2, 4, 48, 0, 0, 21, 0, 0, 0, 0, 0, 120, 122, 67,
};

static void sunkbd_event(void *opaque, int ch)
{
    ChannelState *s = opaque;
    int release = ch & 0x80;

    ch = keycodes[ch & 0x7f];
    KBD_DPRINTF("Keycode %d (%s)\n", ch, release? "release" : "press");
    put_queue(s, ch | release);
}

static void handle_kbd_command(ChannelState *s, int val)
{
    KBD_DPRINTF("Command %d\n", val);
    switch (val) {
    case 1: // Reset, return type code
	put_queue(s, 0xff);
	put_queue(s, 5); // Type 5
	break;
    case 7: // Query layout
	put_queue(s, 0xfe);
	put_queue(s, 0x20); // XXX, layout?
	break;
    default:
	break;
    }
}

static void sunmouse_event(void *opaque, 
                               int dx, int dy, int dz, int buttons_state)
{
    ChannelState *s = opaque;
    int ch;

    /* XXX: SDL sometimes generates nul events: we delete them */
    if (dx == 0 && dy == 0 && dz == 0 && buttons_state == 0)
        return;
    MS_DPRINTF("dx=%d dy=%d buttons=%01x\n", dx, dy, buttons_state);

    ch = 0x80 | 0x7; /* protocol start byte, no buttons pressed */

    if (buttons_state & MOUSE_EVENT_LBUTTON)
        ch ^= 0x4;
    if (buttons_state & MOUSE_EVENT_MBUTTON)
        ch ^= 0x2;
    if (buttons_state & MOUSE_EVENT_RBUTTON)
        ch ^= 0x1;

    put_queue(s, ch);

    ch = dx;

    if (ch > 127)
        ch=127;
    else if (ch < -127)
        ch=-127;

    put_queue(s, ch & 0xff);

    ch = -dy;

    if (ch > 127)
        ch=127;
    else if (ch < -127)
        ch=-127;

    put_queue(s, ch & 0xff);

    // MSC protocol specify two extra motion bytes

    put_queue(s, 0);
    put_queue(s, 0);
}

void slavio_serial_ms_kbd_init(int base, int irq)
{
    int slavio_serial_io_memory, i;
    SerialState *s;

    s = qemu_mallocz(sizeof(SerialState));
    if (!s)
        return;
    for (i = 0; i < 2; i++) {
	s->chn[i].irq = irq;
	s->chn[i].chn = 1 - i;
	s->chn[i].chr = NULL;
    }
    s->chn[0].otherchn = &s->chn[1];
    s->chn[1].otherchn = &s->chn[0];
    s->chn[0].type = mouse;
    s->chn[1].type = kbd;

    slavio_serial_io_memory = cpu_register_io_memory(0, slavio_serial_mem_read, slavio_serial_mem_write, s);
    cpu_register_physical_memory(base, SERIAL_MAXADDR, slavio_serial_io_memory);

    qemu_add_mouse_event_handler(sunmouse_event, &s->chn[0], 0, "QEMU Sun Mouse");
    qemu_add_kbd_event_handler(sunkbd_event, &s->chn[1]);
    qemu_register_reset(slavio_serial_reset, s);
    slavio_serial_reset(s);
}