hw/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.h"
  25 #include "isa.h"
  26 #include "pc.h"
  27 #include "kvm.h"
  28 #include "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 typedef struct _VMPortState
  39 {
  40     ISADevice dev;
  41     MemoryRegion io;
  42     IOPortReadFunc *func[VMPORT_ENTRIES];
  43     void *opaque[VMPORT_ENTRIES];
  44 } VMPortState;
  45
  46 static VMPortState *port_state;
  47
  48 void vmport_register(unsigned char command, IOPortReadFunc *func, void *opaque)
  49 {
  50     if (command >= VMPORT_ENTRIES)
  51         return;
  52
  53     port_state->func[command] = func;
  54     port_state->opaque[command] = opaque;
  55 }
  56
  57 static uint64_t vmport_ioport_read(void *opaque, hwaddr addr,
  58                                    unsigned size)
  59 {
  60     VMPortState *s = opaque;
  61     CPUX86State *env = cpu_single_env;
  62     unsigned char command;
  63     uint32_t eax;
  64
  65     cpu_synchronize_state(env);
  66
  67     eax = env->regs[R_EAX];
  68     if (eax != VMPORT_MAGIC)
  69         return eax;
  70
  71     command = env->regs[R_ECX];
  72     if (command >= VMPORT_ENTRIES)
  73         return eax;
  74     if (!s->func[command])
  75     {
  76 #ifdef VMPORT_DEBUG
  77         fprintf(stderr, "vmport: unknown command %x\n", command);
  78 #endif
  79         return eax;
  80     }
  81
  82     return s->func[command](s->opaque[command], addr);
  83 }
  84
  85 static void vmport_ioport_write(void *opaque, hwaddr addr,
  86                                 uint64_t val, unsigned size)
  87 {
  88     CPUX86State *env = cpu_single_env;
  89
  90     env->regs[R_EAX] = vmport_ioport_read(opaque, addr, 4);
  91 }
  92
  93 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
  94 {
  95     CPUX86State *env = cpu_single_env;
  96     env->regs[R_EBX] = VMPORT_MAGIC;
  97     return 6;
  98 }
  99
 100 static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
 101 {
 102     CPUX86State *env = cpu_single_env;
 103     env->regs[R_EBX] = 0x1177;
 104     return ram_size;
 105 }
 106
 107 /* vmmouse helpers */
 108 void vmmouse_get_data(uint32_t *data)
 109 {
 110     CPUX86State *env = cpu_single_env;
 111
 112     data[0] = env->regs[R_EAX]; data[1] = env->regs[R_EBX];
 113     data[2] = env->regs[R_ECX]; data[3] = env->regs[R_EDX];
 114     data[4] = env->regs[R_ESI]; data[5] = env->regs[R_EDI];
 115 }
 116
 117 void vmmouse_set_data(const uint32_t *data)
 118 {
 119     CPUX86State *env = cpu_single_env;
 120
 121     env->regs[R_EAX] = data[0]; env->regs[R_EBX] = data[1];
 122     env->regs[R_ECX] = data[2]; env->regs[R_EDX] = data[3];
 123     env->regs[R_ESI] = data[4]; env->regs[R_EDI] = data[5];
 124 }
 125
 126 static const MemoryRegionOps vmport_ops = {
 127     .read = vmport_ioport_read,
 128     .write = vmport_ioport_write,
 129     .impl = {
 130         .min_access_size = 4,
 131         .max_access_size = 4,
 132     },
 133     .endianness = DEVICE_LITTLE_ENDIAN,
 134 };
 135
 136 static int vmport_initfn(ISADevice *dev)
 137 {
 138     VMPortState *s = DO_UPCAST(VMPortState, dev, dev);
 139
 140     memory_region_init_io(&s->io, &vmport_ops, s, "vmport", 1);
 141     isa_register_ioport(dev, &s->io, 0x5658);
 142
 143     port_state = s;
 144     /* Register some generic port commands */
 145     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
 146     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
 147     return 0;
 148 }
 149
 150 static void vmport_class_initfn(ObjectClass *klass, void *data)
 151 {
 152     DeviceClass *dc = DEVICE_CLASS(klass);
 153     ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
 154     ic->init = vmport_initfn;
 155     dc->no_user = 1;
 156 }
 157
 158 static TypeInfo vmport_info = {
 159     .name          = "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)