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  * 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 "hw/apm.h"
  24 #include "hw/hw.h"
  25 #include "hw/pci/pci.h"
  26
  27 //#define DEBUG
  28
  29 #ifdef DEBUG
  30 # define APM_DPRINTF(format, ...)       printf(format, ## __VA_ARGS__)
  31 #else
  32 # define APM_DPRINTF(format, ...)       do { } while (0)
  33 #endif
  34
  35 /* fixed I/O location */
  36 #define APM_CNT_IOPORT  0xb2
  37 #define APM_STS_IOPORT  0xb3
  38
  39 static void apm_ioport_writeb(void *opaque, hwaddr addr, uint64_t val,
  40                               unsigned size)
  41 {
  42     APMState *apm = opaque;
  43     addr &= 1;
  44     APM_DPRINTF("apm_ioport_writeb addr=0x%x val=0x%02x\n", addr, val);
  45     if (addr == 0) {
  46         apm->apmc = val;
  47
  48         if (apm->callback) {
  49             (apm->callback)(val, apm->arg);
  50         }
  51     } else {
  52         apm->apms = val;
  53     }
  54 }
  55
  56 static uint64_t apm_ioport_readb(void *opaque, hwaddr addr, unsigned size)
  57 {
  58     APMState *apm = opaque;
  59     uint32_t val;
  60
  61     addr &= 1;
  62     if (addr == 0) {
  63         val = apm->apmc;
  64     } else {
  65         val = apm->apms;
  66     }
  67     APM_DPRINTF("apm_ioport_readb addr=0x%x val=0x%02x\n", addr, val);
  68     return val;
  69 }
  70
  71 const VMStateDescription vmstate_apm = {
  72     .name = "APM State",
  73     .version_id = 1,
  74     .minimum_version_id = 1,
  75     .minimum_version_id_old = 1,
  76     .fields = (VMStateField[]) {
  77         VMSTATE_UINT8(apmc, APMState),
  78         VMSTATE_UINT8(apms, APMState),
  79         VMSTATE_END_OF_LIST()
  80     }
  81 };
  82
  83 static const MemoryRegionOps apm_ops = {
  84     .read = apm_ioport_readb,
  85     .write = apm_ioport_writeb,
  86     .impl = {
  87         .min_access_size = 1,
  88         .max_access_size = 1,
  89     },
  90 };
  91
  92 void apm_init(PCIDevice *dev, APMState *apm, apm_ctrl_changed_t callback,
  93               void *arg)
  94 {
  95     apm->callback = callback;
  96     apm->arg = arg;
  97
  98     /* ioport 0xb2, 0xb3 */
  99     memory_region_init_io(&apm->io, &apm_ops, apm, "apm-io", 2);
 100     memory_region_add_subregion(pci_address_space_io(dev), APM_CNT_IOPORT,
 101                                 &apm->io);
 102 }