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
  33 static 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
  51 static 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
  67 const 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
  78 static 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
  87 void 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 }