1 /* 2 * QEMU Bochs-style debug console ("port E9") emulation 3 * 4 * Copyright (c) 2003-2004 Fabrice Bellard 5 * Copyright (c) 2008 Citrix Systems, Inc. 6 * Copyright (c) Intel Corporation; author: H. Peter Anvin 7 * 8 * Permission is hereby granted, free of charge, to any person obtaining a copy 9 * of this software and associated documentation files (the "Software"), to deal 10 * in the Software without restriction, including without limitation the rights 11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 12 * copies of the Software, and to permit persons to whom the Software is 13 * furnished to do so, subject to the following conditions: 14 * 15 * The above copyright notice and this permission notice shall be included in 16 * all copies or substantial portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 24 * THE SOFTWARE. 25 */ 26 27 #include "qemu/osdep.h" 28 #include "qapi/error.h" 29 #include "hw/hw.h" 30 #include "chardev/char-fe.h" 31 #include "hw/isa/isa.h" 32 33 #define TYPE_ISA_DEBUGCON_DEVICE "isa-debugcon" 34 #define ISA_DEBUGCON_DEVICE(obj) \ 35 OBJECT_CHECK(ISADebugconState, (obj), TYPE_ISA_DEBUGCON_DEVICE) 36 37 //#define DEBUG_DEBUGCON 38 39 typedef struct DebugconState { 40 MemoryRegion io; 41 CharBackend chr; 42 uint32_t readback; 43 } DebugconState; 44 45 typedef struct ISADebugconState { 46 ISADevice parent_obj; 47 48 uint32_t iobase; 49 DebugconState state; 50 } ISADebugconState; 51 52 static void debugcon_ioport_write(void *opaque, hwaddr addr, uint64_t val, 53 unsigned width) 54 { 55 DebugconState *s = opaque; 56 unsigned char ch = val; 57 58 #ifdef DEBUG_DEBUGCON 59 printf(" [debugcon: write addr=0x%04" HWADDR_PRIx " val=0x%02" PRIx64 "]\n", addr, val); 60 #endif 61 62 /* XXX this blocks entire thread. Rewrite to use 63 * qemu_chr_fe_write and background I/O callbacks */ 64 qemu_chr_fe_write_all(&s->chr, &ch, 1); 65 } 66 67 68 static uint64_t debugcon_ioport_read(void *opaque, hwaddr addr, unsigned width) 69 { 70 DebugconState *s = opaque; 71 72 #ifdef DEBUG_DEBUGCON 73 printf("debugcon: read addr=0x%04" HWADDR_PRIx "\n", addr); 74 #endif 75 76 return s->readback; 77 } 78 79 static const MemoryRegionOps debugcon_ops = { 80 .read = debugcon_ioport_read, 81 .write = debugcon_ioport_write, 82 .valid.min_access_size = 1, 83 .valid.max_access_size = 1, 84 .endianness = DEVICE_LITTLE_ENDIAN, 85 }; 86 87 static void debugcon_realize_core(DebugconState *s, Error **errp) 88 { 89 if (!qemu_chr_fe_backend_connected(&s->chr)) { 90 error_setg(errp, "Can't create debugcon device, empty char device"); 91 return; 92 } 93 94 qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, NULL, NULL, s, NULL, true); 95 } 96 97 static void debugcon_isa_realizefn(DeviceState *dev, Error **errp) 98 { 99 ISADevice *d = ISA_DEVICE(dev); 100 ISADebugconState *isa = ISA_DEBUGCON_DEVICE(dev); 101 DebugconState *s = &isa->state; 102 Error *err = NULL; 103 104 debugcon_realize_core(s, &err); 105 if (err != NULL) { 106 error_propagate(errp, err); 107 return; 108 } 109 memory_region_init_io(&s->io, OBJECT(dev), &debugcon_ops, s, 110 TYPE_ISA_DEBUGCON_DEVICE, 1); 111 memory_region_add_subregion(isa_address_space_io(d), 112 isa->iobase, &s->io); 113 } 114 115 static Property debugcon_isa_properties[] = { 116 DEFINE_PROP_UINT32("iobase", ISADebugconState, iobase, 0xe9), 117 DEFINE_PROP_CHR("chardev", ISADebugconState, state.chr), 118 DEFINE_PROP_UINT32("readback", ISADebugconState, state.readback, 0xe9), 119 DEFINE_PROP_END_OF_LIST(), 120 }; 121 122 static void debugcon_isa_class_initfn(ObjectClass *klass, void *data) 123 { 124 DeviceClass *dc = DEVICE_CLASS(klass); 125 126 dc->realize = debugcon_isa_realizefn; 127 dc->props = debugcon_isa_properties; 128 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 129 } 130 131 static const TypeInfo debugcon_isa_info = { 132 .name = TYPE_ISA_DEBUGCON_DEVICE, 133 .parent = TYPE_ISA_DEVICE, 134 .instance_size = sizeof(ISADebugconState), 135 .class_init = debugcon_isa_class_initfn, 136 }; 137 138 static void debugcon_register_types(void) 139 { 140 type_register_static(&debugcon_isa_info); 141 } 142 143 type_init(debugcon_register_types) 144