LXR qemu/hw/apm.c

   1/*
   2 * QEMU PC APM controller Emulation
   3 * This is split out from acpi.c
   4 *
   5 * Copyright (c) 2006 Fabrice Bellard
   6 *
   7 * This library is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU Lesser General Public
   9 * License version 2 as published by the Free Software Foundation.
  10 *
  11 * This library is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 * Lesser General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU Lesser General Public
  17 * License along with this library; if not, see <http://www.gnu.org/licenses/>
  18 */
  19
  20#include "apm.h"
  21#include "hw.h"
  22
  23//#define DEBUG
  24
  25#ifdef DEBUG
  26# define APM_DPRINTF(format, ...)       printf(format, ## __VA_ARGS__)
  27#else
  28# define APM_DPRINTF(format, ...)       do { } while (0)
  29#endif
  30
  31/* fixed I/O location */
  32#define APM_CNT_IOPORT  0xb2
  33#define APM_STS_IOPORT  0xb3
  34
  35static void apm_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
  36{
  37    APMState *apm = opaque;
  38    addr &= 1;
  39    APM_DPRINTF("apm_ioport_writeb addr=0x%x val=0x%02x\n", addr, val);
  40    if (addr == 0) {
  41        apm->apmc = val;
  42
  43        if (apm->callback) {
  44            (apm->callback)(val, apm->arg);
  45        }
  46    } else {
  47        apm->apms = val;
  48    }
  49}
  50
  51static uint32_t apm_ioport_readb(void *opaque, uint32_t addr)
  52{
  53    APMState *apm = opaque;
  54    uint32_t val;
  55
  56    addr &= 1;
  57    if (addr == 0) {
  58        val = apm->apmc;
  59    } else {
  60        val = apm->apms;
  61    }
  62    APM_DPRINTF("apm_ioport_readb addr=0x%x val=0x%02x\n", addr, val);
  63    return val;
  64}
  65
  66const VMStateDescription vmstate_apm = {
  67    .name = "APM State",
  68    .version_id = 1,
  69    .minimum_version_id = 1,
  70    .minimum_version_id_old = 1,
  71    .fields = (VMStateField[]) {
  72        VMSTATE_UINT8(apmc, APMState),
  73        VMSTATE_UINT8(apms, APMState),
  74        VMSTATE_END_OF_LIST()
  75    }
  76};
  77
  78void apm_init(APMState *apm, apm_ctrl_changed_t callback, void *arg)
  79{
  80    apm->callback = callback;
  81    apm->arg = arg;
  82
  83    /* ioport 0xb2, 0xb3 */
  84    register_ioport_write(APM_CNT_IOPORT, 2, 1, apm_ioport_writeb, apm);
  85    register_ioport_read(APM_CNT_IOPORT, 2, 1, apm_ioport_readb, apm);
  86}
  87