hw/misc/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 "hw/hw.h"
  25 #include "hw/isa/isa.h"
  26 #include "hw/i386/pc.h"
  27 #include "sysemu/kvm.h"
  28 #include "hw/qdev.h"
  29
  30 //#define VMPORT_DEBUG
  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 TYPE_VMPORT "vmport"
  39 #define VMPORT(obj) OBJECT_CHECK(VMPortState, (obj), TYPE_VMPORT)
  40
  41 typedef struct VMPortState
  42 {
  43     ISADevice parent_obj;
  44
  45     MemoryRegion io;
  46     VMPortReadFunc *func[VMPORT_ENTRIES];
  47     void *opaque[VMPORT_ENTRIES];
  48 } VMPortState;
  49
  50 static VMPortState *port_state;
  51
  52 void vmport_register(unsigned char command, VMPortReadFunc *func, void *opaque)
  53 {
  54     if (command >= VMPORT_ENTRIES)
  55         return;
  56
  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     CPUX86State *env = cpu_single_env;
  66     unsigned char command;
  67     uint32_t eax;
  68
  69     cpu_synchronize_state(CPU(x86_env_get_cpu(env)));
  70
  71     eax = env->regs[R_EAX];
  72     if (eax != VMPORT_MAGIC)
  73         return eax;
  74
  75     command = env->regs[R_ECX];
  76     if (command >= VMPORT_ENTRIES)
  77         return eax;
  78     if (!s->func[command])
  79     {
  80 #ifdef VMPORT_DEBUG
  81         fprintf(stderr, "vmport: unknown command %x\n", command);
  82 #endif
  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     CPUX86State *env = cpu_single_env;
  93
  94     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     CPUX86State *env = cpu_single_env;
 100     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     CPUX86State *env = cpu_single_env;
 107     env->regs[R_EBX] = 0x1177;
 108     return ram_size;
 109 }
 110
 111 /* vmmouse helpers */
 112 void vmmouse_get_data(uint32_t *data)
 113 {
 114     CPUX86State *env = cpu_single_env;
 115
 116     data[0] = env->regs[R_EAX]; data[1] = env->regs[R_EBX];
 117     data[2] = env->regs[R_ECX]; data[3] = env->regs[R_EDX];
 118     data[4] = env->regs[R_ESI]; data[5] = env->regs[R_EDI];
 119 }
 120
 121 void vmmouse_set_data(const uint32_t *data)
 122 {
 123     CPUX86State *env = cpu_single_env;
 124
 125     env->regs[R_EAX] = data[0]; env->regs[R_EBX] = data[1];
 126     env->regs[R_ECX] = data[2]; env->regs[R_EDX] = data[3];
 127     env->regs[R_ESI] = data[4]; env->regs[R_EDI] = data[5];
 128 }
 129
 130 static const MemoryRegionOps vmport_ops = {
 131     .read = vmport_ioport_read,
 132     .write = vmport_ioport_write,
 133     .impl = {
 134         .min_access_size = 4,
 135         .max_access_size = 4,
 136     },
 137     .endianness = DEVICE_LITTLE_ENDIAN,
 138 };
 139
 140 static void vmport_realizefn(DeviceState *dev, Error **errp)
 141 {
 142     ISADevice *isadev = ISA_DEVICE(dev);
 143     VMPortState *s = VMPORT(dev);
 144
 145     memory_region_init_io(&s->io, OBJECT(s), &vmport_ops, s, "vmport", 1);
 146     isa_register_ioport(isadev, &s->io, 0x5658);
 147
 148     port_state = s;
 149     /* Register some generic port commands */
 150     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
 151     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
 152 }
 153
 154 static void vmport_class_initfn(ObjectClass *klass, void *data)
 155 {
 156     DeviceClass *dc = DEVICE_CLASS(klass);
 157
 158     dc->realize = vmport_realizefn;
 159     dc->no_user = 1;
 160 }
 161
 162 static const TypeInfo vmport_info = {
 163     .name          = TYPE_VMPORT,
 164     .parent        = TYPE_ISA_DEVICE,
 165     .instance_size = sizeof(VMPortState),
 166     .class_init    = vmport_class_initfn,
 167 };
 168
 169 static void vmport_register_types(void)
 170 {
 171     type_register_static(&vmport_info);
 172 }
 173
 174 type_init(vmport_register_types)