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/kvm.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 TYPE_VMPORT "vmport"
  40 #define VMPORT(obj) OBJECT_CHECK(VMPortState, (obj), TYPE_VMPORT)
  41
  42 typedef struct VMPortState
  43 {
  44     ISADevice parent_obj;
  45
  46     MemoryRegion io;
  47     VMPortReadFunc *func[VMPORT_ENTRIES];
  48     void *opaque[VMPORT_ENTRIES];
  49 } VMPortState;
  50
  51 static VMPortState *port_state;
  52
  53 void vmport_register(unsigned char command, VMPortReadFunc *func, void *opaque)
  54 {
  55     if (command >= VMPORT_ENTRIES)
  56         return;
  57
  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     command = env->regs[R_ECX];
  79     if (command >= VMPORT_ENTRIES)
  80         return eax;
  81     if (!s->func[command])
  82     {
  83 #ifdef VMPORT_DEBUG
  84         fprintf(stderr, "vmport: unknown command %x\n", command);
  85 #endif
  86         return eax;
  87     }
  88
  89     return s->func[command](s->opaque[command], addr);
  90 }
  91
  92 static void vmport_ioport_write(void *opaque, hwaddr addr,
  93                                 uint64_t val, unsigned size)
  94 {
  95     X86CPU *cpu = X86_CPU(current_cpu);
  96
  97     cpu->env.regs[R_EAX] = vmport_ioport_read(opaque, addr, 4);
  98 }
  99
 100 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
 101 {
 102     X86CPU *cpu = X86_CPU(current_cpu);
 103
 104     cpu->env.regs[R_EBX] = VMPORT_MAGIC;
 105     return 6;
 106 }
 107
 108 static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
 109 {
 110     X86CPU *cpu = X86_CPU(current_cpu);
 111
 112     cpu->env.regs[R_EBX] = 0x1177;
 113     return ram_size;
 114 }
 115
 116 /* vmmouse helpers */
 117 void vmmouse_get_data(uint32_t *data)
 118 {
 119     X86CPU *cpu = X86_CPU(current_cpu);
 120     CPUX86State *env = &cpu->env;
 121
 122     data[0] = env->regs[R_EAX]; data[1] = env->regs[R_EBX];
 123     data[2] = env->regs[R_ECX]; data[3] = env->regs[R_EDX];
 124     data[4] = env->regs[R_ESI]; data[5] = env->regs[R_EDI];
 125 }
 126
 127 void vmmouse_set_data(const uint32_t *data)
 128 {
 129     X86CPU *cpu = X86_CPU(current_cpu);
 130     CPUX86State *env = &cpu->env;
 131
 132     env->regs[R_EAX] = data[0]; env->regs[R_EBX] = data[1];
 133     env->regs[R_ECX] = data[2]; env->regs[R_EDX] = data[3];
 134     env->regs[R_ESI] = data[4]; env->regs[R_EDI] = data[5];
 135 }
 136
 137 static const MemoryRegionOps vmport_ops = {
 138     .read = vmport_ioport_read,
 139     .write = vmport_ioport_write,
 140     .impl = {
 141         .min_access_size = 4,
 142         .max_access_size = 4,
 143     },
 144     .endianness = DEVICE_LITTLE_ENDIAN,
 145 };
 146
 147 static void vmport_realizefn(DeviceState *dev, Error **errp)
 148 {
 149     ISADevice *isadev = ISA_DEVICE(dev);
 150     VMPortState *s = VMPORT(dev);
 151
 152     memory_region_init_io(&s->io, OBJECT(s), &vmport_ops, s, "vmport", 1);
 153     isa_register_ioport(isadev, &s->io, 0x5658);
 154
 155     port_state = s;
 156     /* Register some generic port commands */
 157     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
 158     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
 159 }
 160
 161 static void vmport_class_initfn(ObjectClass *klass, void *data)
 162 {
 163     DeviceClass *dc = DEVICE_CLASS(klass);
 164
 165     dc->realize = vmport_realizefn;
 166     /* Reason: realize sets global port_state */
 167     dc->cannot_instantiate_with_device_add_yet = true;
 168 }
 169
 170 static const TypeInfo vmport_info = {
 171     .name          = TYPE_VMPORT,
 172     .parent        = TYPE_ISA_DEVICE,
 173     .instance_size = sizeof(VMPortState),
 174     .class_init    = vmport_class_initfn,
 175 };
 176
 177 static void vmport_register_types(void)
 178 {
 179     type_register_static(&vmport_info);
 180 }
 181
 182 type_init(vmport_register_types)