LXR qemu/hw/char/debugcon.c

   1/*
   2 * QEMU Bochs-style debug console ("port E9") emulation
   3 *
   4 * Copyright (c) 2003-2004 Fabrice Bellard
   5 * Copyright (c) 2008 Citrix Systems, Inc.
   6 * Copyright (c) Intel Corporation; author: H. Peter Anvin
   7 *
   8 * Permission is hereby granted, free of charge, to any person obtaining a copy
   9 * of this software and associated documentation files (the "Software"), to deal
  10 * in the Software without restriction, including without limitation the rights
  11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12 * copies of the Software, and to permit persons to whom the Software is
  13 * furnished to do so, subject to the following conditions:
  14 *
  15 * The above copyright notice and this permission notice shall be included in
  16 * all copies or substantial portions of the Software.
  17 *
  18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24 * THE SOFTWARE.
  25 */
  26
  27#include "qemu/osdep.h"
  28#include "qapi/error.h"
  29#include "hw/hw.h"
  30#include "sysemu/char.h"
  31#include "hw/isa/isa.h"
  32#include "hw/i386/pc.h"
  33
  34#define TYPE_ISA_DEBUGCON_DEVICE "isa-debugcon"
  35#define ISA_DEBUGCON_DEVICE(obj) \
  36     OBJECT_CHECK(ISADebugconState, (obj), TYPE_ISA_DEBUGCON_DEVICE)
  37
  38//#define DEBUG_DEBUGCON
  39
  40typedef struct DebugconState {
  41    MemoryRegion io;
  42    CharDriverState *chr;
  43    uint32_t readback;
  44} DebugconState;
  45
  46typedef struct ISADebugconState {
  47    ISADevice parent_obj;
  48
  49    uint32_t iobase;
  50    DebugconState state;
  51} ISADebugconState;
  52
  53static void debugcon_ioport_write(void *opaque, hwaddr addr, uint64_t val,
  54                                  unsigned width)
  55{
  56    DebugconState *s = opaque;
  57    unsigned char ch = val;
  58
  59#ifdef DEBUG_DEBUGCON
  60    printf(" [debugcon: write addr=0x%04" HWADDR_PRIx " val=0x%02" PRIx64 "]\n", addr, val);
  61#endif
  62
  63    qemu_chr_fe_write(s->chr, &ch, 1);
  64}
  65
  66
  67static uint64_t debugcon_ioport_read(void *opaque, hwaddr addr, unsigned width)
  68{
  69    DebugconState *s = opaque;
  70
  71#ifdef DEBUG_DEBUGCON
  72    printf("debugcon: read addr=0x%04" HWADDR_PRIx "\n", addr);
  73#endif
  74
  75    return s->readback;
  76}
  77
  78static const MemoryRegionOps debugcon_ops = {
  79    .read = debugcon_ioport_read,
  80    .write = debugcon_ioport_write,
  81    .valid.min_access_size = 1,
  82    .valid.max_access_size = 1,
  83    .endianness = DEVICE_LITTLE_ENDIAN,
  84};
  85
  86static void debugcon_realize_core(DebugconState *s, Error **errp)
  87{
  88    if (!s->chr) {
  89        error_setg(errp, "Can't create debugcon device, empty char device");
  90        return;
  91    }
  92
  93    qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, s);
  94}
  95
  96static void debugcon_isa_realizefn(DeviceState *dev, Error **errp)
  97{
  98    ISADevice *d = ISA_DEVICE(dev);
  99    ISADebugconState *isa = ISA_DEBUGCON_DEVICE(dev);
 100    DebugconState *s = &isa->state;
 101    Error *err = NULL;
 102
 103    debugcon_realize_core(s, &err);
 104    if (err != NULL) {
 105        error_propagate(errp, err);
 106        return;
 107    }
 108    memory_region_init_io(&s->io, OBJECT(dev), &debugcon_ops, s,
 109                          TYPE_ISA_DEBUGCON_DEVICE, 1);
 110    memory_region_add_subregion(isa_address_space_io(d),
 111                                isa->iobase, &s->io);
 112}
 113
 114static Property debugcon_isa_properties[] = {
 115    DEFINE_PROP_UINT32("iobase", ISADebugconState, iobase, 0xe9),
 116    DEFINE_PROP_CHR("chardev",  ISADebugconState, state.chr),
 117    DEFINE_PROP_UINT32("readback", ISADebugconState, state.readback, 0xe9),
 118    DEFINE_PROP_END_OF_LIST(),
 119};
 120
 121static void debugcon_isa_class_initfn(ObjectClass *klass, void *data)
 122{
 123    DeviceClass *dc = DEVICE_CLASS(klass);
 124
 125    dc->realize = debugcon_isa_realizefn;
 126    dc->props = debugcon_isa_properties;
 127    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 128}
 129
 130static const TypeInfo debugcon_isa_info = {
 131    .name          = TYPE_ISA_DEBUGCON_DEVICE,
 132    .parent        = TYPE_ISA_DEVICE,
 133    .instance_size = sizeof(ISADebugconState),
 134    .class_init    = debugcon_isa_class_initfn,
 135};
 136
 137static void debugcon_register_types(void)
 138{
 139    type_register_static(&debugcon_isa_info);
 140}
 141
 142type_init(debugcon_register_types)
 143