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     IOPortReadFunc *func[VMPORT_ENTRIES];
  42     void *opaque[VMPORT_ENTRIES];
  43 } VMPortState;
  44
  45 static VMPortState *port_state;
  46
  47 void vmport_register(unsigned char command, IOPortReadFunc *func, void *opaque)
  48 {
  49     if (command >= VMPORT_ENTRIES)
  50         return;
  51
  52     port_state->func[command] = func;
  53     port_state->opaque[command] = opaque;
  54 }
  55
  56 static uint32_t vmport_ioport_read(void *opaque, uint32_t addr)
  57 {
  58     VMPortState *s = opaque;
  59     CPUState *env = cpu_single_env;
  60     unsigned char command;
  61     uint32_t eax;
  62
  63     cpu_synchronize_state(env);
  64
  65     eax = env->regs[R_EAX];
  66     if (eax != VMPORT_MAGIC)
  67         return eax;
  68
  69     command = env->regs[R_ECX];
  70     if (command >= VMPORT_ENTRIES)
  71         return eax;
  72     if (!s->func[command])
  73     {
  74 #ifdef VMPORT_DEBUG
  75         fprintf(stderr, "vmport: unknown command %x\n", command);
  76 #endif
  77         return eax;
  78     }
  79
  80     return s->func[command](s->opaque[command], addr);
  81 }
  82
  83 static void vmport_ioport_write(void *opaque, uint32_t addr, uint32_t val)
  84 {
  85     CPUState *env = cpu_single_env;
  86
  87     env->regs[R_EAX] = vmport_ioport_read(opaque, addr);
  88 }
  89
  90 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
  91 {
  92     CPUState *env = cpu_single_env;
  93     env->regs[R_EBX] = VMPORT_MAGIC;
  94     return 6;
  95 }
  96
  97 static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
  98 {
  99     CPUState *env = cpu_single_env;
 100     env->regs[R_EBX] = 0x1177;
 101     return ram_size;
 102 }
 103
 104 /* vmmouse helpers */
 105 void vmmouse_get_data(uint32_t *data)
 106 {
 107     CPUState *env = cpu_single_env;
 108
 109     data[0] = env->regs[R_EAX]; data[1] = env->regs[R_EBX];
 110     data[2] = env->regs[R_ECX]; data[3] = env->regs[R_EDX];
 111     data[4] = env->regs[R_ESI]; data[5] = env->regs[R_EDI];
 112 }
 113
 114 void vmmouse_set_data(const uint32_t *data)
 115 {
 116     CPUState *env = cpu_single_env;
 117
 118     env->regs[R_EAX] = data[0]; env->regs[R_EBX] = data[1];
 119     env->regs[R_ECX] = data[2]; env->regs[R_EDX] = data[3];
 120     env->regs[R_ESI] = data[4]; env->regs[R_EDI] = data[5];
 121 }
 122
 123 static int vmport_initfn(ISADevice *dev)
 124 {
 125     VMPortState *s = DO_UPCAST(VMPortState, dev, dev);
 126
 127     register_ioport_read(0x5658, 1, 4, vmport_ioport_read, s);
 128     register_ioport_write(0x5658, 1, 4, vmport_ioport_write, s);
 129     isa_init_ioport(dev, 0x5658);
 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     return 0;
 135 }
 136
 137 static ISADeviceInfo vmport_info = {
 138     .qdev.name     = "vmport",
 139     .qdev.size     = sizeof(VMPortState),
 140     .qdev.no_user  = 1,
 141     .init          = vmport_initfn,
 142 };
 143
 144 static void vmport_dev_register(void)
 145 {
 146     isa_qdev_register(&vmport_info);
 147 }
 148 device_init(vmport_dev_register)