LXR qemu/hw/isa/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 2.1 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 * Contributions after 2012-01-13 are licensed under the terms of the
  20 * GNU GPL, version 2 or (at your option) any later version.
  21 */
  22
  23#include "qemu/osdep.h"
  24#include "hw/isa/apm.h"
  25#include "hw/pci/pci.h"
  26#include "migration/vmstate.h"
  27#include "trace.h"
  28
  29
  30/* fixed I/O location */
  31#define APM_STS_IOPORT  0xb3
  32
  33static void apm_ioport_writeb(void *opaque, hwaddr addr, uint64_t val,
  34                              unsigned size)
  35{
  36    APMState *apm = opaque;
  37    addr &= 1;
  38
  39    trace_apm_io_write(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 uint64_t apm_ioport_readb(void *opaque, hwaddr addr, unsigned size)
  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    trace_apm_io_read(addr, val);
  63
  64    return val;
  65}
  66
  67const VMStateDescription vmstate_apm = {
  68    .name = "APM State",
  69    .version_id = 1,
  70    .minimum_version_id = 1,
  71    .fields = (VMStateField[]) {
  72        VMSTATE_UINT8(apmc, APMState),
  73        VMSTATE_UINT8(apms, APMState),
  74        VMSTATE_END_OF_LIST()
  75    }
  76};
  77
  78static const MemoryRegionOps apm_ops = {
  79    .read = apm_ioport_readb,
  80    .write = apm_ioport_writeb,
  81    .impl = {
  82        .min_access_size = 1,
  83        .max_access_size = 1,
  84    },
  85};
  86
  87void apm_init(PCIDevice *dev, APMState *apm, apm_ctrl_changed_t callback,
  88              void *arg)
  89{
  90    apm->callback = callback;
  91    apm->arg = arg;
  92
  93    /* ioport 0xb2, 0xb3 */
  94    memory_region_init_io(&apm->io, OBJECT(dev), &apm_ops, apm, "apm-io", 2);
  95    memory_region_add_subregion(pci_address_space_io(dev), APM_CNT_IOPORT,
  96                                &apm->io);
  97}
  98