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