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qemu/hw/input/pckbd.c
Paolo Bonzini d13c040409 pckbd: set bits 2-3-6-7 of the output port by default 
OSes typically write 0xdd/0xdf to turn the A20 line off and on.  This
has bits 2-3-6-7 on, so that the output port subsection is migrated.
Change the reset value and migration default to include those four
bits, thus avoiding that the subsection is migrated.

This strictly speaking changes guest ABI, but the long time during which
we have not migrated the value means that the guests really do not care
much; so the change is for all machine types.

Reported-by: Igor Mammedov <imammedo@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-01-03 09:22:13 +01:00

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/*
* 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/hw.h"
#include "hw/isa/isa.h"
#include "hw/i386/pc.h"
#include "hw/input/ps2.h"
#include "sysemu/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 */
/* OSes typically write 0xdd/0xdf to turn the A20 line off and on.
* We make the default value of the outport include these four bits,
* so that the subsection is rarely necessary.
*/
#define KBD_OUT_ONES 0xcc
/* 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;
bool outport_present;
/* 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;
hwaddr 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 uint64_t kbd_read_status(void *opaque, hwaddr addr,
unsigned size)
{
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 outport_write(KBDState *s, uint32_t val)
{
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 void kbd_write_command(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
KBDState *s = opaque;
DPRINTF("kbd: write cmd=0x%02" PRIx64 "\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, 0x80, 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", (int)val);
break;
}
}
static uint64_t kbd_read_data(void *opaque, hwaddr addr,
unsigned size)
{
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, hwaddr addr,
uint64_t val, unsigned size)
{
KBDState *s = opaque;
DPRINTF("kbd: write data=0x%02" PRIx64 "\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:
outport_write(s, 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 | KBD_OUT_ONES;
s->outport_present = false;
}
static uint8_t kbd_outport_default(KBDState *s)
{
return KBD_OUT_RESET | KBD_OUT_A20 | KBD_OUT_ONES
| (s->status & KBD_STAT_OBF ? KBD_OUT_OBF : 0)
| (s->status & KBD_STAT_MOUSE_OBF ? KBD_OUT_MOUSE_OBF : 0);
}
static int kbd_outport_post_load(void *opaque, int version_id)
{
KBDState *s = opaque;
s->outport_present = true;
return 0;
}
static const VMStateDescription vmstate_kbd_outport = {
.name = "pckbd_outport",
.version_id = 1,
.minimum_version_id = 1,
.post_load = kbd_outport_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT8(outport, KBDState),
VMSTATE_END_OF_LIST()
}
};
static bool kbd_outport_needed(void *opaque)
{
KBDState *s = opaque;
return s->outport != kbd_outport_default(s);
}
static int kbd_post_load(void *opaque, int version_id)
{
KBDState *s = opaque;
if (!s->outport_present) {
s->outport = kbd_outport_default(s);
}
s->outport_present = false;
return 0;
}
static const VMStateDescription vmstate_kbd = {
.name = "pckbd",
.version_id = 3,
.minimum_version_id = 3,
.post_load = kbd_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT8(write_cmd, KBDState),
VMSTATE_UINT8(status, KBDState),
VMSTATE_UINT8(mode, KBDState),
VMSTATE_UINT8(pending, KBDState),
VMSTATE_END_OF_LIST()
},
.subsections = (VMStateSubsection[]) {
{
.vmsd = &vmstate_kbd_outport,
.needed = kbd_outport_needed,
},
VMSTATE_END_OF_LIST()
}
};
/* Memory mapped interface */
static uint32_t kbd_mm_readb (void *opaque, hwaddr addr)
{
KBDState *s = opaque;
if (addr & s->mask)
return kbd_read_status(s, 0, 1) & 0xff;
else
return kbd_read_data(s, 0, 1) & 0xff;
}
static void kbd_mm_writeb (void *opaque, hwaddr addr, uint32_t value)
{
KBDState *s = opaque;
if (addr & s->mask)
kbd_write_command(s, 0, value & 0xff, 1);
else
kbd_write_data(s, 0, value & 0xff, 1);
}
static const MemoryRegionOps i8042_mmio_ops = {
.endianness = DEVICE_NATIVE_ENDIAN,
.old_mmio = {
.read = { kbd_mm_readb, kbd_mm_readb, kbd_mm_readb },
.write = { kbd_mm_writeb, kbd_mm_writeb, kbd_mm_writeb },
},
};
void i8042_mm_init(qemu_irq kbd_irq, qemu_irq mouse_irq,
MemoryRegion *region, ram_addr_t size,
hwaddr mask)
{
KBDState *s = g_malloc0(sizeof(KBDState));
s->irq_kbd = kbd_irq;
s->irq_mouse = mouse_irq;
s->mask = mask;
vmstate_register(NULL, 0, &vmstate_kbd, s);
memory_region_init_io(region, NULL, &i8042_mmio_ops, s, "i8042", size);
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);
}
#define TYPE_I8042 "i8042"
#define I8042(obj) OBJECT_CHECK(ISAKBDState, (obj), TYPE_I8042)
typedef struct ISAKBDState {
ISADevice parent_obj;
KBDState kbd;
MemoryRegion io[2];
} ISAKBDState;
void i8042_isa_mouse_fake_event(void *opaque)
{
ISADevice *dev = opaque;
ISAKBDState *isa = I8042(dev);
KBDState *s = &isa->kbd;
ps2_mouse_fake_event(s->mouse);
}
void i8042_setup_a20_line(ISADevice *dev, qemu_irq *a20_out)
{
ISAKBDState *isa = I8042(dev);
KBDState *s = &isa->kbd;
s->a20_out = a20_out;
}
static const VMStateDescription vmstate_kbd_isa = {
.name = "pckbd",
.version_id = 3,
.minimum_version_id = 3,
.fields = (VMStateField[]) {
VMSTATE_STRUCT(kbd, ISAKBDState, 0, vmstate_kbd, KBDState),
VMSTATE_END_OF_LIST()
}
};
static const MemoryRegionOps i8042_data_ops = {
.read = kbd_read_data,
.write = kbd_write_data,
.impl = {
.min_access_size = 1,
.max_access_size = 1,
},
.endianness = DEVICE_LITTLE_ENDIAN,
};
static const MemoryRegionOps i8042_cmd_ops = {
.read = kbd_read_status,
.write = kbd_write_command,
.impl = {
.min_access_size = 1,
.max_access_size = 1,
},
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void i8042_initfn(Object *obj)
{
ISAKBDState *isa_s = I8042(obj);
KBDState *s = &isa_s->kbd;
memory_region_init_io(isa_s->io + 0, obj, &i8042_data_ops, s,
"i8042-data", 1);
memory_region_init_io(isa_s->io + 1, obj, &i8042_cmd_ops, s,
"i8042-cmd", 1);
}
static void i8042_realizefn(DeviceState *dev, Error **errp)
{
ISADevice *isadev = ISA_DEVICE(dev);
ISAKBDState *isa_s = I8042(dev);
KBDState *s = &isa_s->kbd;
isa_init_irq(isadev, &s->irq_kbd, 1);
isa_init_irq(isadev, &s->irq_mouse, 12);
isa_register_ioport(isadev, isa_s->io + 0, 0x60);
isa_register_ioport(isadev, isa_s->io + 1, 0x64);
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);
}
static void i8042_class_initfn(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = i8042_realizefn;
dc->vmsd = &vmstate_kbd_isa;
}
static const TypeInfo i8042_info = {
.name = TYPE_I8042,
.parent = TYPE_ISA_DEVICE,
.instance_size = sizeof(ISAKBDState),
.instance_init = i8042_initfn,
.class_init = i8042_class_initfn,
};
static void i8042_register_types(void)
{
type_register_static(&i8042_info);
}
type_init(i8042_register_types)
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