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 "hw/hw.h" 28 #include "sysemu/char.h" 29 #include "hw/isa/isa.h" 30 #include "hw/i386/pc.h" 31 32 #define TYPE_ISA_DEBUGCON_DEVICE "isa-debugcon" 33 #define ISA_DEBUGCON_DEVICE(obj) \ 34 OBJECT_CHECK(ISADebugconState, (obj), TYPE_ISA_DEBUGCON_DEVICE) 35 36 //#define DEBUG_DEBUGCON 37 38 typedef struct DebugconState { 39 MemoryRegion io; 40 CharDriverState *chr; 41 uint32_t readback; 42 } DebugconState; 43 44 typedef struct ISADebugconState { 45 ISADevice parent_obj; 46 47 uint32_t iobase; 48 DebugconState state; 49 } ISADebugconState; 50 51 static void debugcon_ioport_write(void *opaque, hwaddr addr, uint64_t val, 52 unsigned width) 53 { 54 DebugconState *s = opaque; 55 unsigned char ch = val; 56 57 #ifdef DEBUG_DEBUGCON 58 printf(" [debugcon: write addr=0x%04" HWADDR_PRIx " val=0x%02" PRIx64 "]\n", addr, val); 59 #endif 60 61 qemu_chr_fe_write(s->chr, &ch, 1); 62 } 63 64 65 static uint64_t debugcon_ioport_read(void *opaque, hwaddr addr, unsigned width) 66 { 67 DebugconState *s = opaque; 68 69 #ifdef DEBUG_DEBUGCON 70 printf("debugcon: read addr=0x%04" HWADDR_PRIx "\n", addr); 71 #endif 72 73 return s->readback; 74 } 75 76 static const MemoryRegionOps debugcon_ops = { 77 .read = debugcon_ioport_read, 78 .write = debugcon_ioport_write, 79 .valid.min_access_size = 1, 80 .valid.max_access_size = 1, 81 .endianness = DEVICE_LITTLE_ENDIAN, 82 }; 83 84 static void debugcon_realize_core(DebugconState *s, Error **errp) 85 { 86 if (!s->chr) { 87 error_setg(errp, "Can't create debugcon device, empty char device"); 88 return; 89 } 90 91 qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, s); 92 } 93 94 static void debugcon_isa_realizefn(DeviceState *dev, Error **errp) 95 { 96 ISADevice *d = ISA_DEVICE(dev); 97 ISADebugconState *isa = ISA_DEBUGCON_DEVICE(dev); 98 DebugconState *s = &isa->state; 99 Error *err = NULL; 100 101 debugcon_realize_core(s, &err); 102 if (err != NULL) { 103 error_propagate(errp, err); 104 return; 105 } 106 memory_region_init_io(&s->io, OBJECT(dev), &debugcon_ops, s, 107 TYPE_ISA_DEBUGCON_DEVICE, 1); 108 memory_region_add_subregion(isa_address_space_io(d), 109 isa->iobase, &s->io); 110 } 111 112 static Property debugcon_isa_properties[] = { 113 DEFINE_PROP_UINT32("iobase", ISADebugconState, iobase, 0xe9), 114 DEFINE_PROP_CHR("chardev", ISADebugconState, state.chr), 115 DEFINE_PROP_UINT32("readback", ISADebugconState, state.readback, 0xe9), 116 DEFINE_PROP_END_OF_LIST(), 117 }; 118 119 static void debugcon_isa_class_initfn(ObjectClass *klass, void *data) 120 { 121 DeviceClass *dc = DEVICE_CLASS(klass); 122 123 dc->realize = debugcon_isa_realizefn; 124 dc->props = debugcon_isa_properties; 125 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 126 } 127 128 static const TypeInfo debugcon_isa_info = { 129 .name = TYPE_ISA_DEBUGCON_DEVICE, 130 .parent = TYPE_ISA_DEVICE, 131 .instance_size = sizeof(ISADebugconState), 132 .class_init = debugcon_isa_class_initfn, 133 }; 134 135 static void debugcon_register_types(void) 136 { 137 type_register_static(&debugcon_isa_info); 138 } 139 140 type_init(debugcon_register_types) 141