1 /* 2 * QEMU VMPort emulation 3 * 4 * Copyright (C) 2007 Hervé Poussineau 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 #include "qemu/osdep.h" 25 #include "hw/isa/isa.h" 26 #include "sysemu/hw_accel.h" 27 #include "qemu/log.h" 28 #include "vmport.h" 29 #include "cpu.h" 30 #include "trace.h" 31 32 #define VMPORT_CMD_GETVERSION 0x0a 33 #define VMPORT_CMD_GETRAMSIZE 0x14 34 35 #define VMPORT_ENTRIES 0x2c 36 #define VMPORT_MAGIC 0x564D5868 37 38 #define VMPORT(obj) OBJECT_CHECK(VMPortState, (obj), TYPE_VMPORT) 39 40 typedef struct VMPortState { 41 ISADevice parent_obj; 42 43 MemoryRegion io; 44 VMPortReadFunc *func[VMPORT_ENTRIES]; 45 void *opaque[VMPORT_ENTRIES]; 46 } VMPortState; 47 48 static VMPortState *port_state; 49 50 void vmport_register(unsigned char command, VMPortReadFunc *func, void *opaque) 51 { 52 if (command >= VMPORT_ENTRIES) { 53 return; 54 } 55 56 trace_vmport_register(command, func, opaque); 57 port_state->func[command] = func; 58 port_state->opaque[command] = opaque; 59 } 60 61 static uint64_t vmport_ioport_read(void *opaque, hwaddr addr, 62 unsigned size) 63 { 64 VMPortState *s = opaque; 65 CPUState *cs = current_cpu; 66 X86CPU *cpu = X86_CPU(cs); 67 CPUX86State *env = &cpu->env; 68 unsigned char command; 69 uint32_t eax; 70 71 cpu_synchronize_state(cs); 72 73 eax = env->regs[R_EAX]; 74 if (eax != VMPORT_MAGIC) { 75 return eax; 76 } 77 78 command = env->regs[R_ECX]; 79 trace_vmport_command(command); 80 if (command >= VMPORT_ENTRIES || !s->func[command]) { 81 qemu_log_mask(LOG_UNIMP, "vmport: unknown command %x\n", command); 82 return eax; 83 } 84 85 return s->func[command](s->opaque[command], addr); 86 } 87 88 static void vmport_ioport_write(void *opaque, hwaddr addr, 89 uint64_t val, unsigned size) 90 { 91 X86CPU *cpu = X86_CPU(current_cpu); 92 93 cpu->env.regs[R_EAX] = vmport_ioport_read(opaque, addr, 4); 94 } 95 96 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr) 97 { 98 X86CPU *cpu = X86_CPU(current_cpu); 99 100 cpu->env.regs[R_EBX] = VMPORT_MAGIC; 101 return 6; 102 } 103 104 static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr) 105 { 106 X86CPU *cpu = X86_CPU(current_cpu); 107 108 cpu->env.regs[R_EBX] = 0x1177; 109 return ram_size; 110 } 111 112 static const MemoryRegionOps vmport_ops = { 113 .read = vmport_ioport_read, 114 .write = vmport_ioport_write, 115 .impl = { 116 .min_access_size = 4, 117 .max_access_size = 4, 118 }, 119 .endianness = DEVICE_LITTLE_ENDIAN, 120 }; 121 122 static void vmport_realizefn(DeviceState *dev, Error **errp) 123 { 124 ISADevice *isadev = ISA_DEVICE(dev); 125 VMPortState *s = VMPORT(dev); 126 127 memory_region_init_io(&s->io, OBJECT(s), &vmport_ops, s, "vmport", 1); 128 isa_register_ioport(isadev, &s->io, 0x5658); 129 130 port_state = s; 131 /* Register some generic port commands */ 132 vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL); 133 vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL); 134 } 135 136 static void vmport_class_initfn(ObjectClass *klass, void *data) 137 { 138 DeviceClass *dc = DEVICE_CLASS(klass); 139 140 dc->realize = vmport_realizefn; 141 /* Reason: realize sets global port_state */ 142 dc->user_creatable = false; 143 } 144 145 static const TypeInfo vmport_info = { 146 .name = TYPE_VMPORT, 147 .parent = TYPE_ISA_DEVICE, 148 .instance_size = sizeof(VMPortState), 149 .class_init = vmport_class_initfn, 150 }; 151 152 static void vmport_register_types(void) 153 { 154 type_register_static(&vmport_info); 155 } 156 157 type_init(vmport_register_types) 158