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
  25 #include "hw.h"
  26 #include "isa.h"
  27 #include "pc.h"
  28 #include "sysemu.h"
  29 #include "libkvm.h"
  30 #include "qemu-kvm.h"
  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     CPUState *env;
  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     unsigned char command;
  60     uint32_t eax;
  61     uint32_t ret;
  62
  63 #ifdef USE_KVM
  64     struct kvm_regs regs;
  65     extern kvm_context_t kvm_context;
  66     if (kvm_allowed) {
  67         kvm_get_regs(kvm_context, s->env->cpu_index, &regs);
  68         s->env->regs[R_EAX] = regs.rax; s->env->regs[R_EBX] = regs.rbx;
  69         s->env->regs[R_ECX] = regs.rcx; s->env->regs[R_EDX] = regs.rdx;
  70         s->env->regs[R_ESI] = regs.rsi; s->env->regs[R_EDI] = regs.rdi;
  71     }
  72 #endif
  73
  74     eax = s->env->regs[R_EAX];
  75     if (eax != VMPORT_MAGIC)
  76         return eax;
  77
  78     command = s->env->regs[R_ECX];
  79     if (command >= VMPORT_ENTRIES)
  80         return eax;
  81     if (!s->func[command])
  82     {
  83         printf("vmport: unknown command %x\n", command);
  84         return eax;
  85     }
  86
  87     ret = s->func[command](s->opaque[command], addr);
  88
  89 #ifdef USE_KVM
  90     if (kvm_allowed) {
  91         regs.rax = s->env->regs[R_EAX]; regs.rbx = s->env->regs[R_EBX];
  92         regs.rcx = s->env->regs[R_ECX]; regs.rdx = s->env->regs[R_EDX];
  93         regs.rsi = s->env->regs[R_ESI]; regs.rdi = s->env->regs[R_EDI];
  94         kvm_set_regs(kvm_context, s->env->cpu_index, &regs);
  95     }
  96 #endif
  97
  98     return ret;
  99 }
 100
 101 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
 102 {
 103     CPUState *env = opaque;
 104     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     CPUState *env = opaque;
 111     env->regs[R_EBX] = 0x1177;
 112     return ram_size;
 113 }
 114
 115 void vmport_init(CPUState *env)
 116 {
 117     port_state.env = env;
 118
 119     register_ioport_read(0x5658, 1, 4, vmport_ioport_read, &port_state);
 120
 121     /* Register some generic port commands */
 122     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, env);
 123     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, env);
 124 }