qemu

FORK: QEMU emulator
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apm.c (2526B)

      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 }