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 25 /* 26 * Guest code that interacts with this virtual device can be found 27 * in VMware open-vm-tools open-source project: 28 * https://github.com/vmware/open-vm-tools 29 */ 30 31 #include "qemu/osdep.h" 32 #include "hw/isa/isa.h" 33 #include "hw/qdev-properties.h" 34 #include "sysemu/hw_accel.h" 35 #include "qemu/log.h" 36 #include "vmport.h" 37 #include "cpu.h" 38 #include "trace.h" 39 40 #define VMPORT_CMD_GETVERSION 0x0a 41 #define VMPORT_CMD_GETRAMSIZE 0x14 42 43 #define VMPORT_ENTRIES 0x2c 44 #define VMPORT_MAGIC 0x564D5868 45 46 #define VMPORT(obj) OBJECT_CHECK(VMPortState, (obj), TYPE_VMPORT) 47 48 typedef struct VMPortState { 49 ISADevice parent_obj; 50 51 MemoryRegion io; 52 VMPortReadFunc *func[VMPORT_ENTRIES]; 53 void *opaque[VMPORT_ENTRIES]; 54 } VMPortState; 55 56 static VMPortState *port_state; 57 58 void vmport_register(unsigned char command, VMPortReadFunc *func, void *opaque) 59 { 60 if (command >= VMPORT_ENTRIES) { 61 return; 62 } 63 64 trace_vmport_register(command, func, opaque); 65 port_state->func[command] = func; 66 port_state->opaque[command] = opaque; 67 } 68 69 static uint64_t vmport_ioport_read(void *opaque, hwaddr addr, 70 unsigned size) 71 { 72 VMPortState *s = opaque; 73 CPUState *cs = current_cpu; 74 X86CPU *cpu = X86_CPU(cs); 75 CPUX86State *env = &cpu->env; 76 unsigned char command; 77 uint32_t eax; 78 79 cpu_synchronize_state(cs); 80 81 eax = env->regs[R_EAX]; 82 if (eax != VMPORT_MAGIC) { 83 return eax; 84 } 85 86 command = env->regs[R_ECX]; 87 trace_vmport_command(command); 88 if (command >= VMPORT_ENTRIES || !s->func[command]) { 89 qemu_log_mask(LOG_UNIMP, "vmport: unknown command %x\n", command); 90 return eax; 91 } 92 93 return s->func[command](s->opaque[command], addr); 94 } 95 96 static void vmport_ioport_write(void *opaque, hwaddr addr, 97 uint64_t val, unsigned size) 98 { 99 X86CPU *cpu = X86_CPU(current_cpu); 100 101 cpu->env.regs[R_EAX] = vmport_ioport_read(opaque, addr, 4); 102 } 103 104 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr) 105 { 106 X86CPU *cpu = X86_CPU(current_cpu); 107 108 cpu->env.regs[R_EBX] = VMPORT_MAGIC; 109 return 6; 110 } 111 112 static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr) 113 { 114 X86CPU *cpu = X86_CPU(current_cpu); 115 116 cpu->env.regs[R_EBX] = 0x1177; 117 return ram_size; 118 } 119 120 static const MemoryRegionOps vmport_ops = { 121 .read = vmport_ioport_read, 122 .write = vmport_ioport_write, 123 .impl = { 124 .min_access_size = 4, 125 .max_access_size = 4, 126 }, 127 .endianness = DEVICE_LITTLE_ENDIAN, 128 }; 129 130 static void vmport_realizefn(DeviceState *dev, Error **errp) 131 { 132 ISADevice *isadev = ISA_DEVICE(dev); 133 VMPortState *s = VMPORT(dev); 134 135 memory_region_init_io(&s->io, OBJECT(s), &vmport_ops, s, "vmport", 1); 136 isa_register_ioport(isadev, &s->io, 0x5658); 137 138 port_state = s; 139 /* Register some generic port commands */ 140 vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL); 141 vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL); 142 } 143 144 static Property vmport_properties[] = { 145 DEFINE_PROP_END_OF_LIST(), 146 }; 147 148 static void vmport_class_initfn(ObjectClass *klass, void *data) 149 { 150 DeviceClass *dc = DEVICE_CLASS(klass); 151 152 dc->realize = vmport_realizefn; 153 /* Reason: realize sets global port_state */ 154 dc->user_creatable = false; 155 device_class_set_props(dc, vmport_properties); 156 } 157 158 static const TypeInfo vmport_info = { 159 .name = TYPE_VMPORT, 160 .parent = TYPE_ISA_DEVICE, 161 .instance_size = sizeof(VMPortState), 162 .class_init = vmport_class_initfn, 163 }; 164 165 static void vmport_register_types(void) 166 { 167 type_register_static(&vmport_info); 168 } 169 170 type_init(vmport_register_types) 171