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 "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
  31 //#define VMPORT_DEBUG
  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 {
  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     CPUState *cs = current_cpu;
  66     X86CPU *cpu = X86_CPU(cs);
  67     CPUX86State *env = &cpu->env;
  68     unsigned char command;
  69     uint32_t eax;
  70
  71     cpu_synchronize_state(cs);
  72
  73     eax = env->regs[R_EAX];
  74     if (eax != VMPORT_MAGIC)
  75         return eax;
  76
  77     command = env->regs[R_ECX];
  78     if (command >= VMPORT_ENTRIES)
  79         return eax;
  80     if (!s->func[command])
  81     {
  82 #ifdef VMPORT_DEBUG
  83         fprintf(stderr, "vmport: unknown command %x\n", command);
  84 #endif
  85         return eax;
  86     }
  87
  88     return s->func[command](s->opaque[command], addr);
  89 }
  90
  91 static void vmport_ioport_write(void *opaque, hwaddr addr,
  92                                 uint64_t val, unsigned size)
  93 {
  94     X86CPU *cpu = X86_CPU(current_cpu);
  95
  96     cpu->env.regs[R_EAX] = vmport_ioport_read(opaque, addr, 4);
  97 }
  98
  99 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
 100 {
 101     X86CPU *cpu = X86_CPU(current_cpu);
 102
 103     cpu->env.regs[R_EBX] = VMPORT_MAGIC;
 104     return 6;
 105 }
 106
 107 static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
 108 {
 109     X86CPU *cpu = X86_CPU(current_cpu);
 110
 111     cpu->env.regs[R_EBX] = 0x1177;
 112     return ram_size;
 113 }
 114
 115 /* vmmouse helpers */
 116 void vmmouse_get_data(uint32_t *data)
 117 {
 118     X86CPU *cpu = X86_CPU(current_cpu);
 119     CPUX86State *env = &cpu->env;
 120
 121     data[0] = env->regs[R_EAX]; data[1] = env->regs[R_EBX];
 122     data[2] = env->regs[R_ECX]; data[3] = env->regs[R_EDX];
 123     data[4] = env->regs[R_ESI]; data[5] = env->regs[R_EDI];
 124 }
 125
 126 void vmmouse_set_data(const uint32_t *data)
 127 {
 128     X86CPU *cpu = X86_CPU(current_cpu);
 129     CPUX86State *env = &cpu->env;
 130
 131     env->regs[R_EAX] = data[0]; env->regs[R_EBX] = data[1];
 132     env->regs[R_ECX] = data[2]; env->regs[R_EDX] = data[3];
 133     env->regs[R_ESI] = data[4]; env->regs[R_EDI] = data[5];
 134 }
 135
 136 static const MemoryRegionOps vmport_ops = {
 137     .read = vmport_ioport_read,
 138     .write = vmport_ioport_write,
 139     .impl = {
 140         .min_access_size = 4,
 141         .max_access_size = 4,
 142     },
 143     .endianness = DEVICE_LITTLE_ENDIAN,
 144 };
 145
 146 static void vmport_realizefn(DeviceState *dev, Error **errp)
 147 {
 148     ISADevice *isadev = ISA_DEVICE(dev);
 149     VMPortState *s = VMPORT(dev);
 150
 151     memory_region_init_io(&s->io, OBJECT(s), &vmport_ops, s, "vmport", 1);
 152     isa_register_ioport(isadev, &s->io, 0x5658);
 153
 154     port_state = s;
 155     /* Register some generic port commands */
 156     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
 157     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
 158 }
 159
 160 static void vmport_class_initfn(ObjectClass *klass, void *data)
 161 {
 162     DeviceClass *dc = DEVICE_CLASS(klass);
 163
 164     dc->realize = vmport_realizefn;
 165     /* Reason: realize sets global port_state */
 166     dc->user_creatable = false;
 167 }
 168
 169 static const TypeInfo vmport_info = {
 170     .name          = TYPE_VMPORT,
 171     .parent        = TYPE_ISA_DEVICE,
 172     .instance_size = sizeof(VMPortState),
 173     .class_init    = vmport_class_initfn,
 174 };
 175
 176 static void vmport_register_types(void)
 177 {
 178     type_register_static(&vmport_info);
 179 }
 180
 181 type_init(vmport_register_types)