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Here is an updated hardware watchdog patch, which should fix everything that was raised about the previous version ... Signed-off-by: Richard W.M. Jones <rjones@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>stable-0.11
Richard W.M. Jones
17 years ago
committed by
Anthony Liguori
Anthony Liguori
9 changed files with 865 additions and 0 deletions
@ -0,0 +1,136 @@ |
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/*
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* Virtual hardware watchdog. |
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* |
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* Copyright (C) 2009 Red Hat Inc. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
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* USA. |
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* |
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* By Richard W.M. Jones (rjones@redhat.com). |
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*/ |
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#include "qemu-common.h" |
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#include "sys-queue.h" |
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#include "sysemu.h" |
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#include "hw/watchdog.h" |
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static LIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list; |
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void watchdog_add_model(WatchdogTimerModel *model) |
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{ |
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LIST_INSERT_HEAD(&watchdog_list, model, entry); |
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} |
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/* Returns:
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* 0 = continue |
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* 1 = exit program with error |
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* 2 = exit program without error |
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*/ |
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int select_watchdog(const char *p) |
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{ |
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WatchdogTimerModel *model; |
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if (watchdog) { |
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fprintf(stderr, |
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"qemu: only one watchdog option may be given\n"); |
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return 1; |
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} |
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/* -watchdog ? lists available devices and exits cleanly. */ |
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if (strcmp(p, "?") == 0) { |
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LIST_FOREACH(model, &watchdog_list, entry) { |
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fprintf(stderr, "\t%s\t%s\n", |
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model->wdt_name, model->wdt_description); |
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} |
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return 2; |
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} |
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LIST_FOREACH(model, &watchdog_list, entry) { |
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if (strcasecmp(model->wdt_name, p) == 0) { |
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watchdog = model; |
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return 0; |
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} |
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} |
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fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n"); |
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LIST_FOREACH(model, &watchdog_list, entry) { |
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fprintf(stderr, "\t%s\t%s\n", |
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model->wdt_name, model->wdt_description); |
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} |
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return 1; |
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} |
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int select_watchdog_action(const char *p) |
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{ |
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if (strcasecmp(p, "reset") == 0) |
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watchdog_action = WDT_RESET; |
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else if (strcasecmp(p, "shutdown") == 0) |
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watchdog_action = WDT_SHUTDOWN; |
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else if (strcasecmp(p, "poweroff") == 0) |
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watchdog_action = WDT_POWEROFF; |
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else if (strcasecmp(p, "pause") == 0) |
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watchdog_action = WDT_PAUSE; |
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else if (strcasecmp(p, "debug") == 0) |
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watchdog_action = WDT_DEBUG; |
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else if (strcasecmp(p, "none") == 0) |
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watchdog_action = WDT_NONE; |
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else |
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return -1; |
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return 0; |
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} |
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/* This actually performs the "action" once a watchdog has expired,
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* ie. reboot, shutdown, exit, etc. |
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*/ |
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void watchdog_perform_action(void) |
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{ |
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switch(watchdog_action) { |
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case WDT_RESET: /* same as 'system_reset' in monitor */ |
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qemu_system_reset_request(); |
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break; |
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case WDT_SHUTDOWN: /* same as 'system_powerdown' in monitor */ |
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qemu_system_powerdown_request(); |
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break; |
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case WDT_POWEROFF: /* same as 'quit' command in monitor */ |
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exit(0); |
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break; |
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case WDT_PAUSE: /* same as 'stop' command in monitor */ |
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vm_stop(0); |
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break; |
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case WDT_DEBUG: |
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fprintf(stderr, "watchdog: timer fired\n"); |
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break; |
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case WDT_NONE: |
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break; |
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} |
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} |
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void watchdog_pc_init(PCIBus *pci_bus) |
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{ |
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if (watchdog) |
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watchdog->wdt_pc_init(pci_bus); |
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} |
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void register_watchdogs(void) |
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{ |
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wdt_ib700_init(); |
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wdt_i6300esb_init(); |
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} |
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@ -0,0 +1,65 @@ |
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/*
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* Virtual hardware watchdog. |
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* |
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* Copyright (C) 2009 Red Hat Inc. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
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* USA. |
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* |
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* By Richard W.M. Jones (rjones@redhat.com). |
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*/ |
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#ifndef QEMU_WATCHDOG_H |
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#define QEMU_WATCHDOG_H |
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extern void wdt_i6300esb_init(void); |
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extern void wdt_ib700_init(void); |
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/* Possible values for action parameter. */ |
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#define WDT_RESET 1 /* Hard reset. */ |
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#define WDT_SHUTDOWN 2 /* Shutdown. */ |
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#define WDT_POWEROFF 3 /* Quit. */ |
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#define WDT_PAUSE 4 /* Pause. */ |
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#define WDT_DEBUG 5 /* Prints a message and continues running. */ |
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#define WDT_NONE 6 /* Do nothing. */ |
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struct WatchdogTimerModel { |
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LIST_ENTRY(WatchdogTimerModel) entry; |
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/* Short name of the device - used to select it on the command line. */ |
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const char *wdt_name; |
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/* Longer description (eg. manufacturer and full model number). */ |
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const char *wdt_description; |
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/* This callback should create/register the device. It is called
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* indirectly from hw/pc.c when the virtual PC is being set up. |
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*/ |
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void (*wdt_pc_init)(PCIBus *pci_bus); |
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}; |
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typedef struct WatchdogTimerModel WatchdogTimerModel; |
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/* in vl.c */ |
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extern WatchdogTimerModel *watchdog; |
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extern int watchdog_action; |
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/* in hw/watchdog.c */ |
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extern int select_watchdog(const char *p); |
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extern int select_watchdog_action(const char *action); |
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extern void watchdog_add_model(WatchdogTimerModel *model); |
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extern void watchdog_perform_action(void); |
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extern void watchdog_pc_init(PCIBus *pci_bus); |
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extern void register_watchdogs(void); |
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#endif /* QEMU_WATCHDOG_H */ |
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@ -0,0 +1,470 @@ |
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/*
|
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* Virtual hardware watchdog. |
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* |
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* Copyright (C) 2009 Red Hat Inc. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
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* USA. |
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* |
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* By Richard W.M. Jones (rjones@redhat.com). |
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*/ |
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#include <inttypes.h> |
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#include "qemu-common.h" |
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#include "qemu-timer.h" |
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#include "watchdog.h" |
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#include "hw.h" |
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#include "isa.h" |
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#include "pc.h" |
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#include "pci.h" |
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/*#define I6300ESB_DEBUG 1*/ |
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#ifdef I6300ESB_DEBUG |
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#define i6300esb_debug(fs,...) \ |
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fprintf(stderr,"i6300esb: %s: "fs,__func__,##__VA_ARGS__) |
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#else |
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#define i6300esb_debug(fs,...) |
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#endif |
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#ifndef PCI_DEVICE_ID_INTEL_ESB_9 |
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#define PCI_DEVICE_ID_INTEL_ESB_9 0x25ab |
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#endif |
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/* PCI configuration registers */ |
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#define ESB_CONFIG_REG 0x60 /* Config register */ |
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#define ESB_LOCK_REG 0x68 /* WDT lock register */ |
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/* Memory mapped registers (offset from base address) */ |
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#define ESB_TIMER1_REG 0x00 /* Timer1 value after each reset */ |
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#define ESB_TIMER2_REG 0x04 /* Timer2 value after each reset */ |
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#define ESB_GINTSR_REG 0x08 /* General Interrupt Status Register */ |
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#define ESB_RELOAD_REG 0x0c /* Reload register */ |
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/* Lock register bits */ |
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#define ESB_WDT_FUNC (0x01 << 2) /* Watchdog functionality */ |
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#define ESB_WDT_ENABLE (0x01 << 1) /* Enable WDT */ |
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#define ESB_WDT_LOCK (0x01 << 0) /* Lock (nowayout) */ |
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/* Config register bits */ |
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#define ESB_WDT_REBOOT (0x01 << 5) /* Enable reboot on timeout */ |
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#define ESB_WDT_FREQ (0x01 << 2) /* Decrement frequency */ |
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#define ESB_WDT_INTTYPE (0x11 << 0) /* Interrupt type on timer1 timeout */ |
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/* Reload register bits */ |
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#define ESB_WDT_RELOAD (0x01 << 8) /* prevent timeout */ |
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/* Magic constants */ |
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#define ESB_UNLOCK1 0x80 /* Step 1 to unlock reset registers */ |
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#define ESB_UNLOCK2 0x86 /* Step 2 to unlock reset registers */ |
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/* Device state. */ |
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struct I6300State { |
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PCIDevice dev; /* PCI device state, must be first field. */ |
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int reboot_enabled; /* "Reboot" on timer expiry. The real action
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* performed depends on the -watchdog-action |
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* param passed on QEMU command line. |
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*/ |
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int clock_scale; /* Clock scale. */ |
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#define CLOCK_SCALE_1KHZ 0 |
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#define CLOCK_SCALE_1MHZ 1 |
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int int_type; /* Interrupt type generated. */ |
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#define INT_TYPE_IRQ 0 /* APIC 1, INT 10 */ |
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#define INT_TYPE_SMI 2 |
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#define INT_TYPE_DISABLED 3 |
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int free_run; /* If true, reload timer on expiry. */ |
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int locked; /* If true, enabled field cannot be changed. */ |
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int enabled; /* If true, watchdog is enabled. */ |
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QEMUTimer *timer; /* The actual watchdog timer. */ |
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uint32_t timer1_preload; /* Values preloaded into timer1, timer2. */ |
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uint32_t timer2_preload; |
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int stage; /* Stage (1 or 2). */ |
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int unlock_state; /* Guest writes 0x80, 0x86 to unlock the
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* registers, and we transition through |
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* states 0 -> 1 -> 2 when this happens. |
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*/ |
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int previous_reboot_flag; /* If the watchdog caused the previous
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* reboot, this flag will be set. |
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*/ |
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}; |
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typedef struct I6300State I6300State; |
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/* This function is called when the watchdog has either been enabled
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* (hence it starts counting down) or has been keep-alived. |
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*/ |
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static void i6300esb_restart_timer(I6300State *d, int stage) |
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{ |
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int64_t timeout; |
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if (!d->enabled) |
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return; |
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d->stage = stage; |
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if (d->stage <= 1) |
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timeout = d->timer1_preload; |
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else |
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timeout = d->timer2_preload; |
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if (d->clock_scale == CLOCK_SCALE_1KHZ) |
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timeout <<= 15; |
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else |
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timeout <<= 5; |
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/* Get the timeout in units of ticks_per_sec. */ |
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timeout = ticks_per_sec * timeout / 33000000; |
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i6300esb_debug("stage %d, timeout %" PRIi64 "\n", d->stage, timeout); |
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qemu_mod_timer(d->timer, qemu_get_clock(vm_clock) + timeout); |
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} |
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/* This is called when the guest disables the watchdog. */ |
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static void i6300esb_disable_timer(I6300State *d) |
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{ |
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i6300esb_debug("timer disabled\n"); |
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qemu_del_timer(d->timer); |
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} |
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static void i6300esb_reset(I6300State *d) |
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{ |
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/* XXX We should probably reset other parts of the state here,
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* but we should also reset our state on general machine reset |
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* too. For now just disable the timer so it doesn't fire |
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* again after the reboot. |
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*/ |
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i6300esb_disable_timer(d); |
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} |
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/* This function is called when the watchdog expires. Note that
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* the hardware has two timers, and so expiry happens in two stages. |
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* If d->stage == 1 then we perform the first stage action (usually, |
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* sending an interrupt) and then restart the timer again for the |
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* second stage. If the second stage expires then the watchdog |
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* really has run out. |
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*/ |
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static void i6300esb_timer_expired(void *vp) |
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{ |
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I6300State *d = (I6300State *) vp; |
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i6300esb_debug("stage %d\n", d->stage); |
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if (d->stage == 1) { |
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/* What to do at the end of stage 1? */ |
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switch (d->int_type) { |
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case INT_TYPE_IRQ: |
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fprintf(stderr, "i6300esb_timer_expired: I would send APIC 1 INT 10 here if I knew how (XXX)\n"); |
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break; |
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case INT_TYPE_SMI: |
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fprintf(stderr, "i6300esb_timer_expired: I would send SMI here if I knew how (XXX)\n"); |
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break; |
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} |
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/* Start the second stage. */ |
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i6300esb_restart_timer(d, 2); |
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} else { |
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/* Second stage expired, reboot for real. */ |
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if (d->reboot_enabled) { |
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d->previous_reboot_flag = 1; |
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watchdog_perform_action(); /* This reboots, exits, etc */ |
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i6300esb_reset(d); |
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} |
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/* In "free running mode" we start stage 1 again. */ |
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if (d->free_run) |
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i6300esb_restart_timer(d, 1); |
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} |
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} |
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static void i6300esb_config_write(PCIDevice *dev, uint32_t addr, |
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uint32_t data, int len) |
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{ |
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I6300State *d = (I6300State *) dev; |
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int old; |
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i6300esb_debug("addr = %x, data = %x, len = %d\n", addr, data, len); |
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if (addr == ESB_CONFIG_REG && len == 2) { |
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d->reboot_enabled = (data & ESB_WDT_REBOOT) == 0; |
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d->clock_scale = |
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(data & ESB_WDT_FREQ) != 0 ? CLOCK_SCALE_1MHZ : CLOCK_SCALE_1KHZ; |
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d->int_type = (data & ESB_WDT_INTTYPE); |
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} else if (addr == ESB_LOCK_REG && len == 1) { |
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if (!d->locked) { |
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d->locked = (data & ESB_WDT_LOCK) != 0; |
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d->free_run = (data & ESB_WDT_FUNC) != 0; |
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old = d->enabled; |
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d->enabled = (data & ESB_WDT_ENABLE) != 0; |
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if (!old && d->enabled) /* Enabled transitioned from 0 -> 1 */ |
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i6300esb_restart_timer(d, 1); |
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else if (!d->enabled) |
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i6300esb_disable_timer(d); |
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} |
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} else { |
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pci_default_write_config(dev, addr, data, len); |
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} |
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} |
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static uint32_t i6300esb_config_read(PCIDevice *dev, uint32_t addr, int len) |
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{ |
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I6300State *d = (I6300State *) dev; |
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uint32_t data; |
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i6300esb_debug ("addr = %x, len = %d\n", addr, len); |
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if (addr == ESB_CONFIG_REG && len == 2) { |
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data = |
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(d->reboot_enabled ? 0 : ESB_WDT_REBOOT) | |
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(d->clock_scale == CLOCK_SCALE_1MHZ ? ESB_WDT_FREQ : 0) | |
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d->int_type; |
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return data; |
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} else if (addr == ESB_LOCK_REG && len == 1) { |
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data = |
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(d->free_run ? ESB_WDT_FUNC : 0) | |
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(d->locked ? ESB_WDT_LOCK : 0) | |
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(d->enabled ? ESB_WDT_ENABLE : 0); |
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return data; |
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} else { |
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return pci_default_read_config(dev, addr, len); |
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} |
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} |
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static uint32_t i6300esb_mem_readb(void *vp, target_phys_addr_t addr) |
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{ |
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i6300esb_debug ("addr = %x\n", (int) addr); |
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return 0; |
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} |
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static uint32_t i6300esb_mem_readw(void *vp, target_phys_addr_t addr) |
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{ |
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uint32_t data = 0; |
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I6300State *d = (I6300State *) vp; |
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i6300esb_debug("addr = %x\n", (int) addr); |
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if (addr == 0xc) { |
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/* The previous reboot flag is really bit 9, but there is
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* a bug in the Linux driver where it thinks it's bit 12. |
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* Set both. |
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*/ |
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data = d->previous_reboot_flag ? 0x1200 : 0; |
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} |
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return data; |
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} |
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static uint32_t i6300esb_mem_readl(void *vp, target_phys_addr_t addr) |
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{ |
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i6300esb_debug("addr = %x\n", (int) addr); |
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return 0; |
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} |
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static void i6300esb_mem_writeb(void *vp, target_phys_addr_t addr, uint32_t val) |
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{ |
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I6300State *d = (I6300State *) vp; |
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i6300esb_debug("addr = %x, val = %x\n", (int) addr, val); |
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if (addr == 0xc && val == 0x80) |
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d->unlock_state = 1; |
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else if (addr == 0xc && val == 0x86 && d->unlock_state == 1) |
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d->unlock_state = 2; |
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} |
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static void i6300esb_mem_writew(void *vp, target_phys_addr_t addr, uint32_t val) |
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{ |
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I6300State *d = (I6300State *) vp; |
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i6300esb_debug("addr = %x, val = %x\n", (int) addr, val); |
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if (addr == 0xc && val == 0x80) |
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d->unlock_state = 1; |
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else if (addr == 0xc && val == 0x86 && d->unlock_state == 1) |
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d->unlock_state = 2; |
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else { |
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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, target_phys_addr_t addr, uint32_t val) |
|||
{ |
|||
I6300State *d = (I6300State *) 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 void i6300esb_map(PCIDevice *dev, int region_num, |
|||
uint32_t addr, uint32_t size, int type) |
|||
{ |
|||
static CPUReadMemoryFunc *mem_read[3] = { |
|||
i6300esb_mem_readb, |
|||
i6300esb_mem_readw, |
|||
i6300esb_mem_readl, |
|||
}; |
|||
static CPUWriteMemoryFunc *mem_write[3] = { |
|||
i6300esb_mem_writeb, |
|||
i6300esb_mem_writew, |
|||
i6300esb_mem_writel, |
|||
}; |
|||
I6300State *d = (I6300State *) dev; |
|||
int io_mem; |
|||
|
|||
i6300esb_debug("addr = %x, size = %x, type = %d\n", addr, size, type); |
|||
|
|||
io_mem = cpu_register_io_memory (0, mem_read, mem_write, d); |
|||
cpu_register_physical_memory (addr, 0x10, io_mem); |
|||
/* qemu_register_coalesced_mmio (addr, 0x10); ? */ |
|||
} |
|||
|
|||
static void i6300esb_save(QEMUFile *f, void *vp) |
|||
{ |
|||
I6300State *d = (I6300State *) vp; |
|||
|
|||
pci_device_save(&d->dev, f); |
|||
qemu_put_be32(f, d->reboot_enabled); |
|||
qemu_put_be32(f, d->clock_scale); |
|||
qemu_put_be32(f, d->int_type); |
|||
qemu_put_be32(f, d->free_run); |
|||
qemu_put_be32(f, d->locked); |
|||
qemu_put_be32(f, d->enabled); |
|||
qemu_put_timer(f, d->timer); |
|||
qemu_put_be32(f, d->timer1_preload); |
|||
qemu_put_be32(f, d->timer2_preload); |
|||
qemu_put_be32(f, d->stage); |
|||
qemu_put_be32(f, d->unlock_state); |
|||
qemu_put_be32(f, d->previous_reboot_flag); |
|||
} |
|||
|
|||
static int i6300esb_load(QEMUFile *f, void *vp, int version) |
|||
{ |
|||
I6300State *d = (I6300State *) vp; |
|||
|
|||
if (version != sizeof (I6300State)) |
|||
return -EINVAL; |
|||
|
|||
pci_device_load(&d->dev, f); |
|||
d->reboot_enabled = qemu_get_be32(f); |
|||
d->clock_scale = qemu_get_be32(f); |
|||
d->int_type = qemu_get_be32(f); |
|||
d->free_run = qemu_get_be32(f); |
|||
d->locked = qemu_get_be32(f); |
|||
d->enabled = qemu_get_be32(f); |
|||
qemu_get_timer(f, d->timer); |
|||
d->timer1_preload = qemu_get_be32(f); |
|||
d->timer2_preload = qemu_get_be32(f); |
|||
d->stage = qemu_get_be32(f); |
|||
d->unlock_state = qemu_get_be32(f); |
|||
d->previous_reboot_flag = qemu_get_be32(f); |
|||
|
|||
return 0; |
|||
} |
|||
|
|||
/* Create and initialize a virtual Intel 6300ESB during PC creation. */ |
|||
static void i6300esb_pc_init(PCIBus *pci_bus) |
|||
{ |
|||
I6300State *d; |
|||
uint8_t *pci_conf; |
|||
|
|||
if (!pci_bus) { |
|||
fprintf(stderr, "wdt_i6300esb: no PCI bus in this machine\n"); |
|||
return; |
|||
} |
|||
|
|||
d = (I6300State *) |
|||
pci_register_device (pci_bus, "i6300esb_wdt", sizeof (I6300State), |
|||
-1, |
|||
i6300esb_config_read, i6300esb_config_write); |
|||
|
|||
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->timer = qemu_new_timer(vm_clock, i6300esb_timer_expired, d); |
|||
d->timer1_preload = 0xfffff; |
|||
d->timer2_preload = 0xfffff; |
|||
d->stage = 1; |
|||
d->unlock_state = 0; |
|||
d->previous_reboot_flag = 0; |
|||
|
|||
pci_conf = d->dev.config; |
|||
pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_INTEL); |
|||
pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_INTEL_ESB_9); |
|||
pci_config_set_class(pci_conf, PCI_CLASS_SYSTEM_OTHER); |
|||
pci_conf[0x0e] = 0x00; |
|||
|
|||
pci_register_io_region(&d->dev, 0, 0x10, |
|||
PCI_ADDRESS_SPACE_MEM, i6300esb_map); |
|||
|
|||
register_savevm("i6300esb_wdt", -1, sizeof(I6300State), |
|||
i6300esb_save, i6300esb_load, d); |
|||
} |
|||
|
|||
static WatchdogTimerModel model = { |
|||
.wdt_name = "i6300esb", |
|||
.wdt_description = "Intel 6300ESB", |
|||
.wdt_pc_init = i6300esb_pc_init, |
|||
}; |
|||
|
|||
void wdt_i6300esb_init(void) |
|||
{ |
|||
watchdog_add_model(&model); |
|||
} |
|||
@ -0,0 +1,112 @@ |
|||
/*
|
|||
* 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, write to the Free Software |
|||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
|||
* USA. |
|||
* |
|||
* By Richard W.M. Jones (rjones@redhat.com). |
|||
*/ |
|||
|
|||
#include "qemu-common.h" |
|||
#include "qemu-timer.h" |
|||
#include "watchdog.h" |
|||
#include "hw.h" |
|||
#include "isa.h" |
|||
#include "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 |
|||
|
|||
/* 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, |
|||
* unchangable IO port, so there could only ever be one anyway). |
|||
*/ |
|||
static QEMUTimer *timer = NULL; |
|||
|
|||
/* A write to this register enables the timer. */ |
|||
static void ib700_write_enable_reg(void *vp, uint32_t addr, uint32_t data) |
|||
{ |
|||
static int time_map[] = { |
|||
30, 28, 26, 24, 22, 20, 18, 16, |
|||
14, 12, 10, 8, 6, 4, 2, 0 |
|||
}; |
|||
int64 timeout; |
|||
|
|||
ib700_debug("addr = %x, data = %x\n", addr, data); |
|||
|
|||
timeout = (int64_t) time_map[data & 0xF] * ticks_per_sec; |
|||
qemu_mod_timer(timer, qemu_get_clock (vm_clock) + 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) |
|||
{ |
|||
ib700_debug("addr = %x, data = %x\n", addr, data); |
|||
|
|||
qemu_del_timer(timer); |
|||
} |
|||
|
|||
/* This is called when the watchdog expires. */ |
|||
static void ib700_timer_expired(void *vp) |
|||
{ |
|||
ib700_debug("watchdog expired\n"); |
|||
|
|||
watchdog_perform_action(); |
|||
qemu_del_timer(timer); |
|||
} |
|||
|
|||
static void ib700_save(QEMUFile *f, void *vp) |
|||
{ |
|||
qemu_put_timer(f, timer); |
|||
} |
|||
|
|||
static int ib700_load(QEMUFile *f, void *vp, int version) |
|||
{ |
|||
if (version != 0) |
|||
return -EINVAL; |
|||
|
|||
qemu_get_timer(f, timer); |
|||
|
|||
return 0; |
|||
} |
|||
|
|||
/* Create and initialize a virtual IB700 during PC creation. */ |
|||
static void ib700_pc_init(PCIBus *unused) |
|||
{ |
|||
register_savevm("ib700_wdt", -1, 0, ib700_save, ib700_load, NULL); |
|||
|
|||
register_ioport_write(0x441, 2, 1, ib700_write_disable_reg, NULL); |
|||
register_ioport_write(0x443, 2, 1, ib700_write_enable_reg, NULL); |
|||
} |
|||
|
|||
static WatchdogTimerModel model = { |
|||
.wdt_name = "ib700", |
|||
.wdt_description = "iBASE 700", |
|||
.wdt_pc_init = ib700_pc_init, |
|||
}; |
|||
|
|||
void wdt_ib700_init(void) |
|||
{ |
|||
watchdog_add_model(&model); |
|||
timer = qemu_new_timer(vm_clock, ib700_timer_expired, NULL); |
|||
} |
|||
Loading…
Reference in new issue