1 /* 2 * QEMU simulated pvpanic device. 3 * 4 * Copyright Fujitsu, Corp. 2013 5 * 6 * Authors: 7 * Wen Congyang <wency@cn.fujitsu.com> 8 * Hu Tao <hutao@cn.fujitsu.com> 9 * 10 * This work is licensed under the terms of the GNU GPL, version 2 or later. 11 * See the COPYING file in the top-level directory. 12 * 13 */ 14 15 #include "qemu/osdep.h" 16 #include "qemu/log.h" 17 #include "qemu/module.h" 18 #include "sysemu/runstate.h" 19 20 #include "hw/nvram/fw_cfg.h" 21 #include "hw/qdev-properties.h" 22 #include "hw/misc/pvpanic.h" 23 #include "qom/object.h" 24 25 /* The bit of supported pv event, TODO: include uapi header and remove this */ 26 #define PVPANIC_F_PANICKED 0 27 #define PVPANIC_F_CRASHLOADED 1 28 29 /* The pv event value */ 30 #define PVPANIC_PANICKED (1 << PVPANIC_F_PANICKED) 31 #define PVPANIC_CRASHLOADED (1 << PVPANIC_F_CRASHLOADED) 32 33 typedef struct PVPanicState PVPanicState; 34 DECLARE_INSTANCE_CHECKER(PVPanicState, ISA_PVPANIC_DEVICE, 35 TYPE_PVPANIC) 36 37 static void handle_event(int event) 38 { 39 static bool logged; 40 41 if (event & ~(PVPANIC_PANICKED | PVPANIC_CRASHLOADED) && !logged) { 42 qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event); 43 logged = true; 44 } 45 46 if (event & PVPANIC_PANICKED) { 47 qemu_system_guest_panicked(NULL); 48 return; 49 } 50 51 if (event & PVPANIC_CRASHLOADED) { 52 qemu_system_guest_crashloaded(NULL); 53 return; 54 } 55 } 56 57 #include "hw/isa/isa.h" 58 59 struct PVPanicState { 60 ISADevice parent_obj; 61 62 MemoryRegion io; 63 uint16_t ioport; 64 }; 65 66 /* return supported events on read */ 67 static uint64_t pvpanic_ioport_read(void *opaque, hwaddr addr, unsigned size) 68 { 69 return PVPANIC_PANICKED; 70 } 71 72 static void pvpanic_ioport_write(void *opaque, hwaddr addr, uint64_t val, 73 unsigned size) 74 { 75 handle_event(val); 76 } 77 78 static const MemoryRegionOps pvpanic_ops = { 79 .read = pvpanic_ioport_read, 80 .write = pvpanic_ioport_write, 81 .impl = { 82 .min_access_size = 1, 83 .max_access_size = 1, 84 }, 85 }; 86 87 static void pvpanic_isa_initfn(Object *obj) 88 { 89 PVPanicState *s = ISA_PVPANIC_DEVICE(obj); 90 91 memory_region_init_io(&s->io, OBJECT(s), &pvpanic_ops, s, "pvpanic", 1); 92 } 93 94 static void pvpanic_isa_realizefn(DeviceState *dev, Error **errp) 95 { 96 ISADevice *d = ISA_DEVICE(dev); 97 PVPanicState *s = ISA_PVPANIC_DEVICE(dev); 98 FWCfgState *fw_cfg = fw_cfg_find(); 99 uint16_t *pvpanic_port; 100 101 if (!fw_cfg) { 102 return; 103 } 104 105 pvpanic_port = g_malloc(sizeof(*pvpanic_port)); 106 *pvpanic_port = cpu_to_le16(s->ioport); 107 fw_cfg_add_file(fw_cfg, "etc/pvpanic-port", pvpanic_port, 108 sizeof(*pvpanic_port)); 109 110 isa_register_ioport(d, &s->io, s->ioport); 111 } 112 113 static Property pvpanic_isa_properties[] = { 114 DEFINE_PROP_UINT16(PVPANIC_IOPORT_PROP, PVPanicState, ioport, 0x505), 115 DEFINE_PROP_END_OF_LIST(), 116 }; 117 118 static void pvpanic_isa_class_init(ObjectClass *klass, void *data) 119 { 120 DeviceClass *dc = DEVICE_CLASS(klass); 121 122 dc->realize = pvpanic_isa_realizefn; 123 device_class_set_props(dc, pvpanic_isa_properties); 124 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 125 } 126 127 static TypeInfo pvpanic_isa_info = { 128 .name = TYPE_PVPANIC, 129 .parent = TYPE_ISA_DEVICE, 130 .instance_size = sizeof(PVPanicState), 131 .instance_init = pvpanic_isa_initfn, 132 .class_init = pvpanic_isa_class_init, 133 }; 134 135 static void pvpanic_register_types(void) 136 { 137 type_register_static(&pvpanic_isa_info); 138 } 139 140 type_init(pvpanic_register_types) 141