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 "hw/hw.h"
  28#include "sysemu/char.h"
  29#include "hw/isa/isa.h"
  30#include "hw/i386/pc.h"
  31
  32#define TYPE_ISA_DEBUGCON_DEVICE "isa-debugcon"
  33#define ISA_DEBUGCON_DEVICE(obj) \
  34     OBJECT_CHECK(ISADebugconState, (obj), TYPE_ISA_DEBUGCON_DEVICE)
  35
  36//#define DEBUG_DEBUGCON
  37
  38typedef struct DebugconState {
  39    MemoryRegion io;
  40    CharDriverState *chr;
  41    uint32_t readback;
  42} DebugconState;
  43
  44typedef struct ISADebugconState {
  45    ISADevice parent_obj;
  46
  47    uint32_t iobase;
  48    DebugconState state;
  49} ISADebugconState;
  50
  51static void debugcon_ioport_write(void *opaque, hwaddr addr, uint64_t val,
  52                                  unsigned width)
  53{
  54    DebugconState *s = opaque;
  55    unsigned char ch = val;
  56
  57#ifdef DEBUG_DEBUGCON
  58    printf(" [debugcon: write addr=0x%04" HWADDR_PRIx " val=0x%02" PRIx64 "]\n", addr, val);
  59#endif
  60
  61    qemu_chr_fe_write(s->chr, &ch, 1);
  62}
  63
  64
  65static uint64_t debugcon_ioport_read(void *opaque, hwaddr addr, unsigned width)
  66{
  67    DebugconState *s = opaque;
  68
  69#ifdef DEBUG_DEBUGCON
  70    printf("debugcon: read addr=0x%04" HWADDR_PRIx "\n", addr);
  71#endif
  72
  73    return s->readback;
  74}
  75
  76static const MemoryRegionOps debugcon_ops = {
  77    .read = debugcon_ioport_read,
  78    .write = debugcon_ioport_write,
  79    .valid.min_access_size = 1,
  80    .valid.max_access_size = 1,
  81    .endianness = DEVICE_LITTLE_ENDIAN,
  82};
  83
  84static void debugcon_realize_core(DebugconState *s, Error **errp)
  85{
  86    if (!s->chr) {
  87        error_setg(errp, "Can't create debugcon device, empty char device");
  88        return;
  89    }
  90
  91    qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, s);
  92}
  93
  94static void debugcon_isa_realizefn(DeviceState *dev, Error **errp)
  95{
  96    ISADevice *d = ISA_DEVICE(dev);
  97    ISADebugconState *isa = ISA_DEBUGCON_DEVICE(dev);
  98    DebugconState *s = &isa->state;
  99    Error *err = NULL;
 100
 101    debugcon_realize_core(s, &err);
 102    if (err != NULL) {
 103        error_propagate(errp, err);
 104        return;
 105    }
 106    memory_region_init_io(&s->io, OBJECT(dev), &debugcon_ops, s,
 107                          TYPE_ISA_DEBUGCON_DEVICE, 1);
 108    memory_region_add_subregion(isa_address_space_io(d),
 109                                isa->iobase, &s->io);
 110}
 111
 112static Property debugcon_isa_properties[] = {
 113    DEFINE_PROP_UINT32("iobase", ISADebugconState, iobase, 0xe9),
 114    DEFINE_PROP_CHR("chardev",  ISADebugconState, state.chr),
 115    DEFINE_PROP_UINT32("readback", ISADebugconState, state.readback, 0xe9),
 116    DEFINE_PROP_END_OF_LIST(),
 117};
 118
 119static void debugcon_isa_class_initfn(ObjectClass *klass, void *data)
 120{
 121    DeviceClass *dc = DEVICE_CLASS(klass);
 122
 123    dc->realize = debugcon_isa_realizefn;
 124    dc->props = debugcon_isa_properties;
 125    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 126}
 127
 128static const TypeInfo debugcon_isa_info = {
 129    .name          = TYPE_ISA_DEBUGCON_DEVICE,
 130    .parent        = TYPE_ISA_DEVICE,
 131    .instance_size = sizeof(ISADebugconState),
 132    .class_init    = debugcon_isa_class_initfn,
 133};
 134
 135static void debugcon_register_types(void)
 136{
 137    type_register_static(&debugcon_isa_info);
 138}
 139
 140type_init(debugcon_register_types)
 141