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 24 /* The bit of supported pv event, TODO: include uapi header and remove this */ 25 #define PVPANIC_F_PANICKED 0 26 #define PVPANIC_F_CRASHLOADED 1 27 28 /* The pv event value */ 29 #define PVPANIC_PANICKED (1 << PVPANIC_F_PANICKED) 30 #define PVPANIC_CRASHLOADED (1 << PVPANIC_F_CRASHLOADED) 31 32 #define ISA_PVPANIC_DEVICE(obj) \ 33 OBJECT_CHECK(PVPanicState, (obj), TYPE_PVPANIC) 34 35 static void handle_event(int event) 36 { 37 static bool logged; 38 39 if (event & ~(PVPANIC_PANICKED | PVPANIC_CRASHLOADED) && !logged) { 40 qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event); 41 logged = true; 42 } 43 44 if (event & PVPANIC_PANICKED) { 45 qemu_system_guest_panicked(NULL); 46 return; 47 } 48 49 if (event & PVPANIC_CRASHLOADED) { 50 qemu_system_guest_crashloaded(NULL); 51 return; 52 } 53 } 54 55 #include "hw/isa/isa.h" 56 57 typedef struct PVPanicState { 58 ISADevice parent_obj; 59 60 MemoryRegion io; 61 uint16_t ioport; 62 } PVPanicState; 63 64 /* return supported events on read */ 65 static uint64_t pvpanic_ioport_read(void *opaque, hwaddr addr, unsigned size) 66 { 67 return PVPANIC_PANICKED; 68 } 69 70 static void pvpanic_ioport_write(void *opaque, hwaddr addr, uint64_t val, 71 unsigned size) 72 { 73 handle_event(val); 74 } 75 76 static const MemoryRegionOps pvpanic_ops = { 77 .read = pvpanic_ioport_read, 78 .write = pvpanic_ioport_write, 79 .impl = { 80 .min_access_size = 1, 81 .max_access_size = 1, 82 }, 83 }; 84 85 static void pvpanic_isa_initfn(Object *obj) 86 { 87 PVPanicState *s = ISA_PVPANIC_DEVICE(obj); 88 89 memory_region_init_io(&s->io, OBJECT(s), &pvpanic_ops, s, "pvpanic", 1); 90 } 91 92 static void pvpanic_isa_realizefn(DeviceState *dev, Error **errp) 93 { 94 ISADevice *d = ISA_DEVICE(dev); 95 PVPanicState *s = ISA_PVPANIC_DEVICE(dev); 96 FWCfgState *fw_cfg = fw_cfg_find(); 97 uint16_t *pvpanic_port; 98 99 if (!fw_cfg) { 100 return; 101 } 102 103 pvpanic_port = g_malloc(sizeof(*pvpanic_port)); 104 *pvpanic_port = cpu_to_le16(s->ioport); 105 fw_cfg_add_file(fw_cfg, "etc/pvpanic-port", pvpanic_port, 106 sizeof(*pvpanic_port)); 107 108 isa_register_ioport(d, &s->io, s->ioport); 109 } 110 111 static Property pvpanic_isa_properties[] = { 112 DEFINE_PROP_UINT16(PVPANIC_IOPORT_PROP, PVPanicState, ioport, 0x505), 113 DEFINE_PROP_END_OF_LIST(), 114 }; 115 116 static void pvpanic_isa_class_init(ObjectClass *klass, void *data) 117 { 118 DeviceClass *dc = DEVICE_CLASS(klass); 119 120 dc->realize = pvpanic_isa_realizefn; 121 device_class_set_props(dc, pvpanic_isa_properties); 122 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 123 } 124 125 static TypeInfo pvpanic_isa_info = { 126 .name = TYPE_PVPANIC, 127 .parent = TYPE_ISA_DEVICE, 128 .instance_size = sizeof(PVPanicState), 129 .instance_init = pvpanic_isa_initfn, 130 .class_init = pvpanic_isa_class_init, 131 }; 132 133 static void pvpanic_register_types(void) 134 { 135 type_register_static(&pvpanic_isa_info); 136 } 137 138 type_init(pvpanic_register_types) 139