hw/i386/vmport.c

   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/hw.h"
  26 #include "hw/isa/isa.h"
  27 #include "hw/i386/pc.h"
  28 #include "sysemu/hw_accel.h"
  29 #include "hw/qdev.h"
  30 #include "qemu/log.h"
  31 #include "trace.h"
  32
  33 #define VMPORT_CMD_GETVERSION 0x0a
  34 #define VMPORT_CMD_GETRAMSIZE 0x14
  35
  36 #define VMPORT_ENTRIES 0x2c
  37 #define VMPORT_MAGIC   0x564D5868
  38
  39 #define VMPORT(obj) OBJECT_CHECK(VMPortState, (obj), TYPE_VMPORT)
  40
  41 typedef struct VMPortState {
  42     ISADevice parent_obj;
  43
  44     MemoryRegion io;
  45     VMPortReadFunc *func[VMPORT_ENTRIES];
  46     void *opaque[VMPORT_ENTRIES];
  47 } VMPortState;
  48
  49 static VMPortState *port_state;
  50
  51 void vmport_register(unsigned char command, VMPortReadFunc *func, void *opaque)
  52 {
  53     if (command >= VMPORT_ENTRIES) {
  54         return;
  55     }
  56
  57     trace_vmport_register(command, func, opaque);
  58     port_state->func[command] = func;
  59     port_state->opaque[command] = opaque;
  60 }
  61
  62 static uint64_t vmport_ioport_read(void *opaque, hwaddr addr,
  63                                    unsigned size)
  64 {
  65     VMPortState *s = opaque;
  66     CPUState *cs = current_cpu;
  67     X86CPU *cpu = X86_CPU(cs);
  68     CPUX86State *env = &cpu->env;
  69     unsigned char command;
  70     uint32_t eax;
  71
  72     cpu_synchronize_state(cs);
  73
  74     eax = env->regs[R_EAX];
  75     if (eax != VMPORT_MAGIC) {
  76         return eax;
  77     }
  78
  79     command = env->regs[R_ECX];
  80     trace_vmport_command(command);
  81     if (command >= VMPORT_ENTRIES || !s->func[command]) {
  82         qemu_log_mask(LOG_UNIMP, "vmport: unknown command %x\n", command);
  83         return eax;
  84     }
  85
  86     return s->func[command](s->opaque[command], addr);
  87 }
  88
  89 static void vmport_ioport_write(void *opaque, hwaddr addr,
  90                                 uint64_t val, unsigned size)
  91 {
  92     X86CPU *cpu = X86_CPU(current_cpu);
  93
  94     cpu->env.regs[R_EAX] = vmport_ioport_read(opaque, addr, 4);
  95 }
  96
  97 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
  98 {
  99     X86CPU *cpu = X86_CPU(current_cpu);
 100
 101     cpu->env.regs[R_EBX] = VMPORT_MAGIC;
 102     return 6;
 103 }
 104
 105 static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
 106 {
 107     X86CPU *cpu = X86_CPU(current_cpu);
 108
 109     cpu->env.regs[R_EBX] = 0x1177;
 110     return ram_size;
 111 }
 112
 113 /* vmmouse helpers */
 114 void vmmouse_get_data(uint32_t *data)
 115 {
 116     X86CPU *cpu = X86_CPU(current_cpu);
 117     CPUX86State *env = &cpu->env;
 118
 119     data[0] = env->regs[R_EAX]; data[1] = env->regs[R_EBX];
 120     data[2] = env->regs[R_ECX]; data[3] = env->regs[R_EDX];
 121     data[4] = env->regs[R_ESI]; data[5] = env->regs[R_EDI];
 122 }
 123
 124 void vmmouse_set_data(const uint32_t *data)
 125 {
 126     X86CPU *cpu = X86_CPU(current_cpu);
 127     CPUX86State *env = &cpu->env;
 128
 129     env->regs[R_EAX] = data[0]; env->regs[R_EBX] = data[1];
 130     env->regs[R_ECX] = data[2]; env->regs[R_EDX] = data[3];
 131     env->regs[R_ESI] = data[4]; env->regs[R_EDI] = data[5];
 132 }
 133
 134 static const MemoryRegionOps vmport_ops = {
 135     .read = vmport_ioport_read,
 136     .write = vmport_ioport_write,
 137     .impl = {
 138         .min_access_size = 4,
 139         .max_access_size = 4,
 140     },
 141     .endianness = DEVICE_LITTLE_ENDIAN,
 142 };
 143
 144 static void vmport_realizefn(DeviceState *dev, Error **errp)
 145 {
 146     ISADevice *isadev = ISA_DEVICE(dev);
 147     VMPortState *s = VMPORT(dev);
 148
 149     memory_region_init_io(&s->io, OBJECT(s), &vmport_ops, s, "vmport", 1);
 150     isa_register_ioport(isadev, &s->io, 0x5658);
 151
 152     port_state = s;
 153     /* Register some generic port commands */
 154     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
 155     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
 156 }
 157
 158 static void vmport_class_initfn(ObjectClass *klass, void *data)
 159 {
 160     DeviceClass *dc = DEVICE_CLASS(klass);
 161
 162     dc->realize = vmport_realizefn;
 163     /* Reason: realize sets global port_state */
 164     dc->user_creatable = false;
 165 }
 166
 167 static const TypeInfo vmport_info = {
 168     .name          = TYPE_VMPORT,
 169     .parent        = TYPE_ISA_DEVICE,
 170     .instance_size = sizeof(VMPortState),
 171     .class_init    = vmport_class_initfn,
 172 };
 173
 174 static void vmport_register_types(void)
 175 {
 176     type_register_static(&vmport_info);
 177 }
 178
 179 type_init(vmport_register_types)