Archipelago » qemu

/*

 * QEMU NVRAM emulation for DS1225Y chip

 *

 * Copyright (c) 2007-2008 Herv? Poussineau

 *

 * 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 "sysbus.h"

#include "trace.h"

typedef struct {

    DeviceState qdev;

    MemoryRegion iomem;

    uint32_t chip_size;

    char *filename;

    FILE *file;

    uint8_t *contents;

} NvRamState;

static uint64_t nvram_read(void *opaque, target_phys_addr_t addr, unsigned size)

{

    NvRamState *s = opaque;

    uint32_t val;

    val = s->contents[addr];

    trace_nvram_read(addr, val);

    return val;

}

static void nvram_write(void *opaque, target_phys_addr_t addr, uint64_t val,

                        unsigned size)

{

    NvRamState *s = opaque;

    val &= 0xff;

    trace_nvram_write(addr, s->contents[addr], val);

    s->contents[addr] = val;

    if (s->file) {

        fseek(s->file, addr, SEEK_SET);

        fputc(val, s->file);

        fflush(s->file);

    }

}

static const MemoryRegionOps nvram_ops = {

    .read = nvram_read,

    .write = nvram_write,

    .impl = {

        .min_access_size = 1,

        .max_access_size = 1,

    },

    .endianness = DEVICE_LITTLE_ENDIAN,

};

static int nvram_post_load(void *opaque, int version_id)

{

    NvRamState *s = opaque;

    /* Close file, as filename may has changed in load/store process */

    if (s->file) {

        fclose(s->file);

    }

    /* Write back nvram contents */

    s->file = fopen(s->filename, "wb");

    if (s->file) {

        /* Write back contents, as 'wb' mode cleaned the file */

        if (fwrite(s->contents, s->chip_size, 1, s->file) != 1) {

            printf("nvram_post_load: short write\n");

        }

        fflush(s->file);

    }

    return 0;

}

static const VMStateDescription vmstate_nvram = {

    .name = "nvram",

    .version_id = 0,

    .minimum_version_id = 0,

    .minimum_version_id_old = 0,

    .post_load = nvram_post_load,

    .fields = (VMStateField[]) {

        VMSTATE_VARRAY_UINT32(contents, NvRamState, chip_size, 0,

                              vmstate_info_uint8, uint8_t),

        VMSTATE_END_OF_LIST()

    }

};

typedef struct {

    SysBusDevice busdev;

    NvRamState nvram;

} SysBusNvRamState;

static int nvram_sysbus_initfn(SysBusDevice *dev)

{

    NvRamState *s = &FROM_SYSBUS(SysBusNvRamState, dev)->nvram;

    FILE *file;

    s->contents = g_malloc0(s->chip_size);

    memory_region_init_io(&s->iomem, &nvram_ops, s, "nvram", s->chip_size);

    sysbus_init_mmio(dev, &s->iomem);

    /* Read current file */

    file = fopen(s->filename, "rb");

    if (file) {

        /* Read nvram contents */

        if (fread(s->contents, s->chip_size, 1, file) != 1) {

            printf("nvram_sysbus_initfn: short read\n");

        }

        fclose(file);

    }

    nvram_post_load(s, 0);

    return 0;

}

static SysBusDeviceInfo nvram_sysbus_info = {

    .qdev.name  = "ds1225y",

    .qdev.size  = sizeof(SysBusNvRamState),

    .qdev.vmsd  = &vmstate_nvram,

    .init       = nvram_sysbus_initfn,

    .qdev.props = (Property[]) {

        DEFINE_PROP_UINT32("size", SysBusNvRamState, nvram.chip_size, 0x2000),

        DEFINE_PROP_STRING("filename", SysBusNvRamState, nvram.filename),

        DEFINE_PROP_END_OF_LIST(),

    },

};

static void nvram_register(void)

{

    sysbus_register_withprop(&nvram_sysbus_info);

}

device_init(nvram_register)