Initial import of abandoned HQEMU version 2.5.2HEADmaster

5 files changed, 907 insertions, 0 deletions

diff --git a/src/hw/watchdog/Makefile.objs b/src/hw/watchdog/Makefile.objs
new file mode 100644
index 0000000..72e3ffd
--- /dev/null
+++ b/src/hw/watchdog/Makefile.objs
@@ -0,0 +1,4 @@
+common-obj-y += watchdog.o
+common-obj-$(CONFIG_WDT_IB6300ESB) += wdt_i6300esb.o
+common-obj-$(CONFIG_WDT_IB700) += wdt_ib700.o
+common-obj-$(CONFIG_WDT_DIAG288) += wdt_diag288.o
diff --git a/src/hw/watchdog/watchdog.c b/src/hw/watchdog/watchdog.c
new file mode 100644
index 0000000..8d4b0ee
--- /dev/null
+++ b/src/hw/watchdog/watchdog.c
@@ -0,0 +1,152 @@
+/*
+ * Virtual hardware watchdog.
+ *
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * By Richard W.M. Jones (rjones@redhat.com).
+ */
+
+#include "qemu-common.h"
+#include "qemu/option.h"
+#include "qemu/config-file.h"
+#include "qemu/queue.h"
+#include "qapi/qmp/types.h"
+#include "sysemu/sysemu.h"
+#include "sysemu/watchdog.h"
+#include "qapi-event.h"
+#include "hw/nmi.h"
+
+/* Possible values for action parameter. */
+#define WDT_RESET        1	/* Hard reset. */
+#define WDT_SHUTDOWN     2	/* Shutdown. */
+#define WDT_POWEROFF     3	/* Quit. */
+#define WDT_PAUSE        4	/* Pause. */
+#define WDT_DEBUG        5	/* Prints a message and continues running. */
+#define WDT_NONE         6	/* Do nothing. */
+#define WDT_NMI          7	/* Inject nmi into the guest */
+
+static int watchdog_action = WDT_RESET;
+static QLIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list;
+
+void watchdog_add_model(WatchdogTimerModel *model)
+{
+    QLIST_INSERT_HEAD(&watchdog_list, model, entry);
+}
+
+/* Returns:
+ *   0 = continue
+ *   1 = exit program with error
+ *   2 = exit program without error
+ */
+int select_watchdog(const char *p)
+{
+    WatchdogTimerModel *model;
+    QemuOpts *opts;
+
+    /* -watchdog ? lists available devices and exits cleanly. */
+    if (is_help_option(p)) {
+        QLIST_FOREACH(model, &watchdog_list, entry) {
+            fprintf(stderr, "\t%s\t%s\n",
+                     model->wdt_name, model->wdt_description);
+        }
+        return 2;
+    }
+
+    QLIST_FOREACH(model, &watchdog_list, entry) {
+        if (strcasecmp(model->wdt_name, p) == 0) {
+            /* add the device */
+            opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
+                                    &error_abort);
+            qemu_opt_set(opts, "driver", p, &error_abort);
+            return 0;
+        }
+    }
+
+    fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n");
+    QLIST_FOREACH(model, &watchdog_list, entry) {
+        fprintf(stderr, "\t%s\t%s\n",
+                 model->wdt_name, model->wdt_description);
+    }
+    return 1;
+}
+
+int select_watchdog_action(const char *p)
+{
+    if (strcasecmp(p, "reset") == 0)
+        watchdog_action = WDT_RESET;
+    else if (strcasecmp(p, "shutdown") == 0)
+        watchdog_action = WDT_SHUTDOWN;
+    else if (strcasecmp(p, "poweroff") == 0)
+        watchdog_action = WDT_POWEROFF;
+    else if (strcasecmp(p, "pause") == 0)
+        watchdog_action = WDT_PAUSE;
+    else if (strcasecmp(p, "debug") == 0)
+        watchdog_action = WDT_DEBUG;
+    else if (strcasecmp(p, "none") == 0)
+        watchdog_action = WDT_NONE;
+    else if (strcasecmp(p, "inject-nmi") == 0)
+        watchdog_action = WDT_NMI;
+    else
+        return -1;
+
+    return 0;
+}
+
+/* This actually performs the "action" once a watchdog has expired,
+ * ie. reboot, shutdown, exit, etc.
+ */
+void watchdog_perform_action(void)
+{
+    switch (watchdog_action) {
+    case WDT_RESET:             /* same as 'system_reset' in monitor */
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_RESET, &error_abort);
+        qemu_system_reset_request();
+        break;
+
+    case WDT_SHUTDOWN:          /* same as 'system_powerdown' in monitor */
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_SHUTDOWN, &error_abort);
+        qemu_system_powerdown_request();
+        break;
+
+    case WDT_POWEROFF:          /* same as 'quit' command in monitor */
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_POWEROFF, &error_abort);
+        exit(0);
+
+    case WDT_PAUSE:             /* same as 'stop' command in monitor */
+        /* In a timer callback, when vm_stop calls qemu_clock_enable
+         * you would get a deadlock.  Bypass the problem.
+         */
+        qemu_system_vmstop_request_prepare();
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_PAUSE, &error_abort);
+        qemu_system_vmstop_request(RUN_STATE_WATCHDOG);
+        break;
+
+    case WDT_DEBUG:
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_DEBUG, &error_abort);
+        fprintf(stderr, "watchdog: timer fired\n");
+        break;
+
+    case WDT_NONE:
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_NONE, &error_abort);
+        break;
+
+    case WDT_NMI:
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_INJECT_NMI,
+                                 &error_abort);
+        inject_nmi();
+        break;
+    }
+}
diff --git a/src/hw/watchdog/wdt_diag288.c b/src/hw/watchdog/wdt_diag288.c
new file mode 100644
index 0000000..2a885a4
--- /dev/null
+++ b/src/hw/watchdog/wdt_diag288.c
@@ -0,0 +1,130 @@
+/*
+ * watchdog device diag288 support
+ *
+ * Copyright IBM, Corp. 2015
+ *
+ * Authors:
+ *  Xu Wang <gesaint@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at your
+ * option) any later version.  See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "sysemu/watchdog.h"
+#include "hw/sysbus.h"
+#include "qemu/timer.h"
+#include "hw/watchdog/wdt_diag288.h"
+
+static WatchdogTimerModel model = {
+    .wdt_name = TYPE_WDT_DIAG288,
+    .wdt_description = "diag288 device for s390x platform",
+};
+
+static const VMStateDescription vmstate_diag288 = {
+    .name = "vmstate_diag288",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .fields = (VMStateField[]) {
+        VMSTATE_TIMER_PTR(timer, DIAG288State),
+        VMSTATE_BOOL(enabled, DIAG288State),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static void wdt_diag288_reset(DeviceState *dev)
+{
+    DIAG288State *diag288 = DIAG288(dev);
+
+    diag288->enabled = false;
+    timer_del(diag288->timer);
+}
+
+static void diag288_reset(void *opaque)
+{
+    DeviceState *diag288 = opaque;
+
+    wdt_diag288_reset(diag288);
+}
+
+static void diag288_timer_expired(void *dev)
+{
+    qemu_log_mask(CPU_LOG_RESET, "Watchdog timer expired.\n");
+    watchdog_perform_action();
+    wdt_diag288_reset(dev);
+}
+
+static int wdt_diag288_handle_timer(DIAG288State *diag288,
+                                     uint64_t func, uint64_t timeout)
+{
+    switch (func) {
+    case WDT_DIAG288_INIT:
+        diag288->enabled = true;
+        /* fall through */
+    case WDT_DIAG288_CHANGE:
+        if (!diag288->enabled) {
+            return -1;
+        }
+        timer_mod(diag288->timer,
+                  qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
+                  timeout * get_ticks_per_sec());
+        break;
+    case WDT_DIAG288_CANCEL:
+        if (!diag288->enabled) {
+            return -1;
+        }
+        diag288->enabled = false;
+        timer_del(diag288->timer);
+        break;
+    default:
+        return -1;
+    }
+
+    return 0;
+}
+
+static void wdt_diag288_realize(DeviceState *dev, Error **errp)
+{
+    DIAG288State *diag288 = DIAG288(dev);
+
+    qemu_register_reset(diag288_reset, diag288);
+    diag288->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, diag288_timer_expired,
+                                  dev);
+}
+
+static void wdt_diag288_unrealize(DeviceState *dev, Error **errp)
+{
+    DIAG288State *diag288 = DIAG288(dev);
+
+    timer_del(diag288->timer);
+    timer_free(diag288->timer);
+}
+
+static void wdt_diag288_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    DIAG288Class *diag288 = DIAG288_CLASS(klass);
+
+    dc->realize = wdt_diag288_realize;
+    dc->unrealize = wdt_diag288_unrealize;
+    dc->reset = wdt_diag288_reset;
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+    dc->vmsd = &vmstate_diag288;
+    diag288->handle_timer = wdt_diag288_handle_timer;
+}
+
+static const TypeInfo wdt_diag288_info = {
+    .class_init = wdt_diag288_class_init,
+    .parent = TYPE_DEVICE,
+    .name  = TYPE_WDT_DIAG288,
+    .instance_size  = sizeof(DIAG288State),
+    .class_size = sizeof(DIAG288Class),
+};
+
+static void wdt_diag288_register_types(void)
+{
+    watchdog_add_model(&model);
+    type_register_static(&wdt_diag288_info);
+}
+
+type_init(wdt_diag288_register_types)
diff --git a/src/hw/watchdog/wdt_i6300esb.c b/src/hw/watchdog/wdt_i6300esb.c
new file mode 100644
index 0000000..a91c8fd
--- /dev/null
+++ b/src/hw/watchdog/wdt_i6300esb.c
@@ -0,0 +1,465 @@
+/*
+ * Virtual hardware watchdog.
+ *
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * By Richard W.M. Jones (rjones@redhat.com).
+ */
+
+#include <inttypes.h>
+
+#include "qemu-common.h"
+#include "qemu/timer.h"
+#include "sysemu/watchdog.h"
+#include "hw/hw.h"
+#include "hw/pci/pci.h"
+
+/*#define I6300ESB_DEBUG 1*/
+
+#ifdef I6300ESB_DEBUG
+#define i6300esb_debug(fs,...) \
+    fprintf(stderr,"i6300esb: %s: "fs,__func__,##__VA_ARGS__)
+#else
+#define i6300esb_debug(fs,...)
+#endif
+
+/* PCI configuration registers */
+#define ESB_CONFIG_REG  0x60            /* Config register                   */
+#define ESB_LOCK_REG    0x68            /* WDT lock register                 */
+
+/* Memory mapped registers (offset from base address) */
+#define ESB_TIMER1_REG  0x00            /* Timer1 value after each reset     */
+#define ESB_TIMER2_REG  0x04            /* Timer2 value after each reset     */
+#define ESB_GINTSR_REG  0x08            /* General Interrupt Status Register */
+#define ESB_RELOAD_REG  0x0c            /* Reload register                   */
+
+/* Lock register bits */
+#define ESB_WDT_FUNC    (0x01 << 2)   /* Watchdog functionality            */
+#define ESB_WDT_ENABLE  (0x01 << 1)   /* Enable WDT                        */
+#define ESB_WDT_LOCK    (0x01 << 0)   /* Lock (nowayout)                   */
+
+/* Config register bits */
+#define ESB_WDT_REBOOT  (0x01 << 5)   /* Enable reboot on timeout          */
+#define ESB_WDT_FREQ    (0x01 << 2)   /* Decrement frequency               */
+#define ESB_WDT_INTTYPE (0x11 << 0)   /* Interrupt type on timer1 timeout  */
+
+/* Reload register bits */
+#define ESB_WDT_RELOAD  (0x01 << 8)    /* prevent timeout                   */
+
+/* Magic constants */
+#define ESB_UNLOCK1     0x80            /* Step 1 to unlock reset registers  */
+#define ESB_UNLOCK2     0x86            /* Step 2 to unlock reset registers  */
+
+/* Device state. */
+struct I6300State {
+    PCIDevice dev;
+    MemoryRegion io_mem;
+
+    int reboot_enabled;         /* "Reboot" on timer expiry.  The real action
+                                 * performed depends on the -watchdog-action
+                                 * param passed on QEMU command line.
+                                 */
+    int clock_scale;            /* Clock scale. */
+#define CLOCK_SCALE_1KHZ 0
+#define CLOCK_SCALE_1MHZ 1
+
+    int int_type;               /* Interrupt type generated. */
+#define INT_TYPE_IRQ 0          /* APIC 1, INT 10 */
+#define INT_TYPE_SMI 2
+#define INT_TYPE_DISABLED 3
+
+    int free_run;               /* If true, reload timer on expiry. */
+    int locked;                 /* If true, enabled field cannot be changed. */
+    int enabled;                /* If true, watchdog is enabled. */
+
+    QEMUTimer *timer;           /* The actual watchdog timer. */
+
+    uint32_t timer1_preload;    /* Values preloaded into timer1, timer2. */
+    uint32_t timer2_preload;
+    int stage;                  /* Stage (1 or 2). */
+
+    int unlock_state;           /* Guest writes 0x80, 0x86 to unlock the
+                                 * registers, and we transition through
+                                 * states 0 -> 1 -> 2 when this happens.
+                                 */
+
+    int previous_reboot_flag;   /* If the watchdog caused the previous
+                                 * reboot, this flag will be set.
+                                 */
+};
+
+typedef struct I6300State I6300State;
+
+#define TYPE_WATCHDOG_I6300ESB_DEVICE "i6300esb"
+#define WATCHDOG_I6300ESB_DEVICE(obj) \
+    OBJECT_CHECK(I6300State, (obj), TYPE_WATCHDOG_I6300ESB_DEVICE)
+
+/* This function is called when the watchdog has either been enabled
+ * (hence it starts counting down) or has been keep-alived.
+ */
+static void i6300esb_restart_timer(I6300State *d, int stage)
+{
+    int64_t timeout;
+
+    if (!d->enabled)
+        return;
+
+    d->stage = stage;
+
+    if (d->stage <= 1)
+        timeout = d->timer1_preload;
+    else
+        timeout = d->timer2_preload;
+
+    if (d->clock_scale == CLOCK_SCALE_1KHZ)
+        timeout <<= 15;
+    else
+        timeout <<= 5;
+
+    /* Get the timeout in nanoseconds. */
+
+    timeout = timeout * 30; /* on a PCI bus, 1 tick is 30 ns*/
+
+    i6300esb_debug("stage %d, timeout %" PRIi64 "\n", d->stage, timeout);
+
+    timer_mod(d->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + timeout);
+}
+
+/* This is called when the guest disables the watchdog. */
+static void i6300esb_disable_timer(I6300State *d)
+{
+    i6300esb_debug("timer disabled\n");
+
+    timer_del(d->timer);
+}
+
+static void i6300esb_reset(DeviceState *dev)
+{
+    PCIDevice *pdev = PCI_DEVICE(dev);
+    I6300State *d = WATCHDOG_I6300ESB_DEVICE(pdev);
+
+    i6300esb_debug("I6300State = %p\n", d);
+
+    i6300esb_disable_timer(d);
+
+    /* NB: Don't change d->previous_reboot_flag in this function. */
+
+    d->reboot_enabled = 1;
+    d->clock_scale = CLOCK_SCALE_1KHZ;
+    d->int_type = INT_TYPE_IRQ;
+    d->free_run = 0;
+    d->locked = 0;
+    d->enabled = 0;
+    d->timer1_preload = 0xfffff;
+    d->timer2_preload = 0xfffff;
+    d->stage = 1;
+    d->unlock_state = 0;
+}
+
+/* This function is called when the watchdog expires.  Note that
+ * the hardware has two timers, and so expiry happens in two stages.
+ * If d->stage == 1 then we perform the first stage action (usually,
+ * sending an interrupt) and then restart the timer again for the
+ * second stage.  If the second stage expires then the watchdog
+ * really has run out.
+ */
+static void i6300esb_timer_expired(void *vp)
+{
+    I6300State *d = vp;
+
+    i6300esb_debug("stage %d\n", d->stage);
+
+    if (d->stage == 1) {
+        /* What to do at the end of stage 1? */
+        switch (d->int_type) {
+        case INT_TYPE_IRQ:
+            fprintf(stderr, "i6300esb_timer_expired: I would send APIC 1 INT 10 here if I knew how (XXX)\n");
+            break;
+        case INT_TYPE_SMI:
+            fprintf(stderr, "i6300esb_timer_expired: I would send SMI here if I knew how (XXX)\n");
+            break;
+        }
+
+        /* Start the second stage. */
+        i6300esb_restart_timer(d, 2);
+    } else {
+        /* Second stage expired, reboot for real. */
+        if (d->reboot_enabled) {
+            d->previous_reboot_flag = 1;
+            watchdog_perform_action(); /* This reboots, exits, etc */
+            i6300esb_reset(&d->dev.qdev);
+        }
+
+        /* In "free running mode" we start stage 1 again. */
+        if (d->free_run)
+            i6300esb_restart_timer(d, 1);
+    }
+}
+
+static void i6300esb_config_write(PCIDevice *dev, uint32_t addr,
+                                  uint32_t data, int len)
+{
+    I6300State *d = WATCHDOG_I6300ESB_DEVICE(dev);
+    int old;
+
+    i6300esb_debug("addr = %x, data = %x, len = %d\n", addr, data, len);
+
+    if (addr == ESB_CONFIG_REG && len == 2) {
+        d->reboot_enabled = (data & ESB_WDT_REBOOT) == 0;
+        d->clock_scale =
+            (data & ESB_WDT_FREQ) != 0 ? CLOCK_SCALE_1MHZ : CLOCK_SCALE_1KHZ;
+        d->int_type = (data & ESB_WDT_INTTYPE);
+    } else if (addr == ESB_LOCK_REG && len == 1) {
+        if (!d->locked) {
+            d->locked = (data & ESB_WDT_LOCK) != 0;
+            d->free_run = (data & ESB_WDT_FUNC) != 0;
+            old = d->enabled;
+            d->enabled = (data & ESB_WDT_ENABLE) != 0;
+            if (!old && d->enabled) /* Enabled transitioned from 0 -> 1 */
+                i6300esb_restart_timer(d, 1);
+            else if (!d->enabled)
+                i6300esb_disable_timer(d);
+        }
+    } else {
+        pci_default_write_config(dev, addr, data, len);
+    }
+}
+
+static uint32_t i6300esb_config_read(PCIDevice *dev, uint32_t addr, int len)
+{
+    I6300State *d = WATCHDOG_I6300ESB_DEVICE(dev);
+    uint32_t data;
+
+    i6300esb_debug ("addr = %x, len = %d\n", addr, len);
+
+    if (addr == ESB_CONFIG_REG && len == 2) {
+        data =
+            (d->reboot_enabled ? 0 : ESB_WDT_REBOOT) |
+            (d->clock_scale == CLOCK_SCALE_1MHZ ? ESB_WDT_FREQ : 0) |
+            d->int_type;
+        return data;
+    } else if (addr == ESB_LOCK_REG && len == 1) {
+        data =
+            (d->free_run ? ESB_WDT_FUNC : 0) |
+            (d->locked ? ESB_WDT_LOCK : 0) |
+            (d->enabled ? ESB_WDT_ENABLE : 0);
+        return data;
+    } else {
+        return pci_default_read_config(dev, addr, len);
+    }
+}
+
+static uint32_t i6300esb_mem_readb(void *vp, hwaddr addr)
+{
+    i6300esb_debug ("addr = %x\n", (int) addr);
+
+    return 0;
+}
+
+static uint32_t i6300esb_mem_readw(void *vp, hwaddr addr)
+{
+    uint32_t data = 0;
+    I6300State *d = vp;
+
+    i6300esb_debug("addr = %x\n", (int) addr);
+
+    if (addr == 0xc) {
+        /* The previous reboot flag is really bit 9, but there is
+         * a bug in the Linux driver where it thinks it's bit 12.
+         * Set both.
+         */
+        data = d->previous_reboot_flag ? 0x1200 : 0;
+    }
+
+    return data;
+}
+
+static uint32_t i6300esb_mem_readl(void *vp, hwaddr addr)
+{
+    i6300esb_debug("addr = %x\n", (int) addr);
+
+    return 0;
+}
+
+static void i6300esb_mem_writeb(void *vp, hwaddr addr, uint32_t val)
+{
+    I6300State *d = vp;
+
+    i6300esb_debug("addr = %x, val = %x\n", (int) addr, val);
+
+    if (addr == 0xc && val == 0x80)
+        d->unlock_state = 1;
+    else if (addr == 0xc && val == 0x86 && d->unlock_state == 1)
+        d->unlock_state = 2;
+}
+
+static void i6300esb_mem_writew(void *vp, hwaddr addr, uint32_t val)
+{
+    I6300State *d = vp;
+
+    i6300esb_debug("addr = %x, val = %x\n", (int) addr, val);
+
+    if (addr == 0xc && val == 0x80)
+        d->unlock_state = 1;
+    else if (addr == 0xc && val == 0x86 && d->unlock_state == 1)
+        d->unlock_state = 2;
+    else {
+        if (d->unlock_state == 2) {
+            if (addr == 0xc) {
+                if ((val & 0x100) != 0)
+                    /* This is the "ping" from the userspace watchdog in
+                     * the guest ...
+                     */
+                    i6300esb_restart_timer(d, 1);
+
+                /* Setting bit 9 resets the previous reboot flag.
+                 * There's a bug in the Linux driver where it sets
+                 * bit 12 instead.
+                 */
+                if ((val & 0x200) != 0 || (val & 0x1000) != 0) {
+                    d->previous_reboot_flag = 0;
+                }
+            }
+
+            d->unlock_state = 0;
+        }
+    }
+}
+
+static void i6300esb_mem_writel(void *vp, hwaddr addr, uint32_t val)
+{
+    I6300State *d = vp;
+
+    i6300esb_debug ("addr = %x, val = %x\n", (int) addr, val);
+
+    if (addr == 0xc && val == 0x80)
+        d->unlock_state = 1;
+    else if (addr == 0xc && val == 0x86 && d->unlock_state == 1)
+        d->unlock_state = 2;
+    else {
+        if (d->unlock_state == 2) {
+            if (addr == 0)
+                d->timer1_preload = val & 0xfffff;
+            else if (addr == 4)
+                d->timer2_preload = val & 0xfffff;
+
+            d->unlock_state = 0;
+        }
+    }
+}
+
+static const MemoryRegionOps i6300esb_ops = {
+    .old_mmio = {
+        .read = {
+            i6300esb_mem_readb,
+            i6300esb_mem_readw,
+            i6300esb_mem_readl,
+        },
+        .write = {
+            i6300esb_mem_writeb,
+            i6300esb_mem_writew,
+            i6300esb_mem_writel,
+        },
+    },
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static const VMStateDescription vmstate_i6300esb = {
+    .name = "i6300esb_wdt",
+    /* With this VMSD's introduction, version_id/minimum_version_id were
+     * erroneously set to sizeof(I6300State), causing a somewhat random
+     * version_id to be set for every build. This eventually broke
+     * migration.
+     *
+     * To correct this without breaking old->new migration for older
+     * versions of QEMU, we've set version_id to a value high enough
+     * to exceed all past values of sizeof(I6300State) across various
+     * build environments, and have reset minimum_version_id to 1,
+     * since this VMSD has never changed and thus can accept all past
+     * versions.
+     *
+     * For future changes we can treat these values as we normally would.
+     */
+    .version_id = 10000,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_PCI_DEVICE(dev, I6300State),
+        VMSTATE_INT32(reboot_enabled, I6300State),
+        VMSTATE_INT32(clock_scale, I6300State),
+        VMSTATE_INT32(int_type, I6300State),
+        VMSTATE_INT32(free_run, I6300State),
+        VMSTATE_INT32(locked, I6300State),
+        VMSTATE_INT32(enabled, I6300State),
+        VMSTATE_TIMER_PTR(timer, I6300State),
+        VMSTATE_UINT32(timer1_preload, I6300State),
+        VMSTATE_UINT32(timer2_preload, I6300State),
+        VMSTATE_INT32(stage, I6300State),
+        VMSTATE_INT32(unlock_state, I6300State),
+        VMSTATE_INT32(previous_reboot_flag, I6300State),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static void i6300esb_realize(PCIDevice *dev, Error **errp)
+{
+    I6300State *d = WATCHDOG_I6300ESB_DEVICE(dev);
+
+    i6300esb_debug("I6300State = %p\n", d);
+
+    d->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, i6300esb_timer_expired, d);
+    d->previous_reboot_flag = 0;
+
+    memory_region_init_io(&d->io_mem, OBJECT(d), &i6300esb_ops, d,
+                          "i6300esb", 0x10);
+    pci_register_bar(&d->dev, 0, 0, &d->io_mem);
+    /* qemu_register_coalesced_mmio (addr, 0x10); ? */
+}
+
+static WatchdogTimerModel model = {
+    .wdt_name = "i6300esb",
+    .wdt_description = "Intel 6300ESB",
+};
+
+static void i6300esb_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+    k->config_read = i6300esb_config_read;
+    k->config_write = i6300esb_config_write;
+    k->realize = i6300esb_realize;
+    k->vendor_id = PCI_VENDOR_ID_INTEL;
+    k->device_id = PCI_DEVICE_ID_INTEL_ESB_9;
+    k->class_id = PCI_CLASS_SYSTEM_OTHER;
+    dc->reset = i6300esb_reset;
+    dc->vmsd = &vmstate_i6300esb;
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+}
+
+static const TypeInfo i6300esb_info = {
+    .name          = TYPE_WATCHDOG_I6300ESB_DEVICE,
+    .parent        = TYPE_PCI_DEVICE,
+    .instance_size = sizeof(I6300State),
+    .class_init    = i6300esb_class_init,
+};
+
+static void i6300esb_register_types(void)
+{
+    watchdog_add_model(&model);
+    type_register_static(&i6300esb_info);
+}
+
+type_init(i6300esb_register_types)
diff --git a/src/hw/watchdog/wdt_ib700.c b/src/hw/watchdog/wdt_ib700.c
new file mode 100644
index 0000000..0917a71
--- /dev/null
+++ b/src/hw/watchdog/wdt_ib700.c
@@ -0,0 +1,156 @@
+/*
+ * Virtual hardware watchdog.
+ *
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * By Richard W.M. Jones (rjones@redhat.com).
+ */
+
+#include "qemu-common.h"
+#include "qemu/timer.h"
+#include "sysemu/watchdog.h"
+#include "hw/hw.h"
+#include "hw/isa/isa.h"
+#include "hw/i386/pc.h"
+
+/*#define IB700_DEBUG 1*/
+
+#ifdef IB700_DEBUG
+#define ib700_debug(fs,...)					\
+    fprintf(stderr,"ib700: %s: "fs,__func__,##__VA_ARGS__)
+#else
+#define ib700_debug(fs,...)
+#endif
+
+#define TYPE_IB700 "ib700"
+#define IB700(obj) OBJECT_CHECK(IB700State, (obj), TYPE_IB700)
+
+typedef struct IB700state {
+    ISADevice parent_obj;
+
+    QEMUTimer *timer;
+
+    PortioList port_list;
+} IB700State;
+
+/* This is the timer.  We use a global here because the watchdog
+ * code ensures there is only one watchdog (it is located at a fixed,
+ * unchangeable IO port, so there could only ever be one anyway).
+ */
+
+/* A write to this register enables the timer. */
+static void ib700_write_enable_reg(void *vp, uint32_t addr, uint32_t data)
+{
+    IB700State *s = vp;
+    static int time_map[] = {
+        30, 28, 26, 24, 22, 20, 18, 16,
+        14, 12, 10,  8,  6,  4,  2,  0
+    };
+    int64_t timeout;
+
+    ib700_debug("addr = %x, data = %x\n", addr, data);
+
+    timeout = (int64_t) time_map[data & 0xF] * get_ticks_per_sec();
+    timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + timeout);
+}
+
+/* A write (of any value) to this register disables the timer. */
+static void ib700_write_disable_reg(void *vp, uint32_t addr, uint32_t data)
+{
+    IB700State *s = vp;
+
+    ib700_debug("addr = %x, data = %x\n", addr, data);
+
+    timer_del(s->timer);
+}
+
+/* This is called when the watchdog expires. */
+static void ib700_timer_expired(void *vp)
+{
+    IB700State *s = vp;
+
+    ib700_debug("watchdog expired\n");
+
+    watchdog_perform_action();
+    timer_del(s->timer);
+}
+
+static const VMStateDescription vmstate_ib700 = {
+    .name = "ib700_wdt",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .fields = (VMStateField[]) {
+        VMSTATE_TIMER_PTR(timer, IB700State),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static const MemoryRegionPortio wdt_portio_list[] = {
+    { 0x441, 2, 1, .write = ib700_write_disable_reg, },
+    { 0x443, 2, 1, .write = ib700_write_enable_reg, },
+    PORTIO_END_OF_LIST(),
+};
+
+static void wdt_ib700_realize(DeviceState *dev, Error **errp)
+{
+    IB700State *s = IB700(dev);
+
+    ib700_debug("watchdog init\n");
+
+    s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, ib700_timer_expired, s);
+
+    portio_list_init(&s->port_list, OBJECT(s), wdt_portio_list, s, "ib700");
+    portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj), 0);
+}
+
+static void wdt_ib700_reset(DeviceState *dev)
+{
+    IB700State *s = IB700(dev);
+
+    ib700_debug("watchdog reset\n");
+
+    timer_del(s->timer);
+}
+
+static WatchdogTimerModel model = {
+    .wdt_name = "ib700",
+    .wdt_description = "iBASE 700",
+};
+
+static void wdt_ib700_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->realize = wdt_ib700_realize;
+    dc->reset = wdt_ib700_reset;
+    dc->vmsd = &vmstate_ib700;
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+}
+
+static const TypeInfo wdt_ib700_info = {
+    .name          = TYPE_IB700,
+    .parent        = TYPE_ISA_DEVICE,
+    .instance_size = sizeof(IB700State),
+    .class_init    = wdt_ib700_class_init,
+};
+
+static void wdt_ib700_register_types(void)
+{
+    watchdog_add_model(&model);
+    type_register_static(&wdt_ib700_info);
+}
+
+type_init(wdt_ib700_register_types)