Archipelago » qemu

/*

 * QEMU Bochs-style debug console ("port E9") emulation

 *

 * Copyright (c) 2003-2004 Fabrice Bellard

 * Copyright (c) 2008 Citrix Systems, Inc.

 * Copyright (c) Intel Corporation; author: H. Peter Anvin

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "hw/hw.h"

#include "sysemu/char.h"

#include "hw/isa/isa.h"

#include "hw/i386/pc.h"

#define TYPE_ISA_DEBUGCON_DEVICE "isa-debugcon"

#define ISA_DEBUGCON_DEVICE(obj) \

     OBJECT_CHECK(ISADebugconState, (obj), TYPE_ISA_DEBUGCON_DEVICE)

//#define DEBUG_DEBUGCON

typedef struct DebugconState {

    MemoryRegion io;

    CharDriverState *chr;

    uint32_t readback;

} DebugconState;

typedef struct ISADebugconState {

    ISADevice parent_obj;

    uint32_t iobase;

    DebugconState state;

} ISADebugconState;

static void debugcon_ioport_write(void *opaque, hwaddr addr, uint64_t val,

                                  unsigned width)

{

    DebugconState *s = opaque;

    unsigned char ch = val;

#ifdef DEBUG_DEBUGCON

    printf(" [debugcon: write addr=0x%04" HWADDR_PRIx " val=0x%02" PRIx64 "]\n", addr, val);

#endif

    qemu_chr_fe_write(s->chr, &ch, 1);

}

static uint64_t debugcon_ioport_read(void *opaque, hwaddr addr, unsigned width)

{

    DebugconState *s = opaque;

#ifdef DEBUG_DEBUGCON

    printf("debugcon: read addr=0x%04" HWADDR_PRIx "\n", addr);

#endif

    return s->readback;

}

static const MemoryRegionOps debugcon_ops = {

    .read = debugcon_ioport_read,

    .write = debugcon_ioport_write,

    .valid.min_access_size = 1,

    .valid.max_access_size = 1,

    .endianness = DEVICE_LITTLE_ENDIAN,

};

static void debugcon_realize_core(DebugconState *s, Error **errp)

{

    if (!s->chr) {

        error_setg(errp, "Can't create debugcon device, empty char device");

        return;

    }

    qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, s);

}

static void debugcon_isa_realizefn(DeviceState *dev, Error **errp)

{

    ISADevice *d = ISA_DEVICE(dev);

    ISADebugconState *isa = ISA_DEBUGCON_DEVICE(dev);

    DebugconState *s = &isa->state;

    Error *err = NULL;

    debugcon_realize_core(s, &err);

    if (err != NULL) {

        error_propagate(errp, err);

        return;

    }

    memory_region_init_io(&s->io, OBJECT(dev), &debugcon_ops, s,

                          TYPE_ISA_DEBUGCON_DEVICE, 1);

    memory_region_add_subregion(isa_address_space_io(d),

                                isa->iobase, &s->io);

}

static Property debugcon_isa_properties[] = {

    DEFINE_PROP_UINT32("iobase", ISADebugconState, iobase, 0xe9),

    DEFINE_PROP_CHR("chardev",  ISADebugconState, state.chr),

    DEFINE_PROP_UINT32("readback", ISADebugconState, state.readback, 0xe9),

    DEFINE_PROP_END_OF_LIST(),

};

static void debugcon_isa_class_initfn(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    dc->realize = debugcon_isa_realizefn;

    dc->props = debugcon_isa_properties;

    set_bit(DEVICE_CATEGORY_MISC, dc->categories);

}

static const TypeInfo debugcon_isa_info = {

    .name          = TYPE_ISA_DEBUGCON_DEVICE,

    .parent        = TYPE_ISA_DEVICE,

    .instance_size = sizeof(ISADebugconState),

    .class_init    = debugcon_isa_class_initfn,

};

static void debugcon_register_types(void)

{

    type_register_static(&debugcon_isa_info);

}

type_init(debugcon_register_types)