hw/pc_sysfw.c

/*
 * QEMU PC System Firmware
 *
 * Copyright (c) 2003-2004 Fabrice Bellard
 * Copyright (c) 2011-2012 Intel Corporation
 *
 * 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 "hw.h"
#include "pc.h"
#include "loader.h"
#include "sysemu.h"

#define BIOS_FILENAME "bios.bin"

typedef struct PcSysFwDevice {
    SysBusDevice busdev;
    uint8_t rom_only;
} PcSysFwDevice;

static void pc_system_rom_init(MemoryRegion *rom_memory)
{
    char *filename;
    MemoryRegion *bios, *isa_bios;
    int bios_size, isa_bios_size;
    int ret;

    /* BIOS load */
    if (bios_name == NULL) {
        bios_name = BIOS_FILENAME;
    }
    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
    if (filename) {
        bios_size = get_image_size(filename);
    } else {
        bios_size = -1;
    }
    if (bios_size <= 0 ||
        (bios_size % 65536) != 0) {
        goto bios_error;
    }
    bios = g_malloc(sizeof(*bios));
    memory_region_init_ram(bios, "pc.bios", bios_size);
    vmstate_register_ram_global(bios);
    memory_region_set_readonly(bios, true);
    ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
    if (ret != 0) {
    bios_error:
        fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
        exit(1);
    }
    if (filename) {
        g_free(filename);
    }

    /* map the last 128KB of the BIOS in ISA space */
    isa_bios_size = bios_size;
    if (isa_bios_size > (128 * 1024)) {
        isa_bios_size = 128 * 1024;
    }
    isa_bios = g_malloc(sizeof(*isa_bios));
    memory_region_init_alias(isa_bios, "isa-bios", bios,
                             bios_size - isa_bios_size, isa_bios_size);
    memory_region_add_subregion_overlap(rom_memory,
                                        0x100000 - isa_bios_size,
                                        isa_bios,
                                        1);
    memory_region_set_readonly(isa_bios, true);

    /* map all the bios at the top of memory */
    memory_region_add_subregion(rom_memory,
                                (uint32_t)(-bios_size),
                                bios);
}

void pc_system_firmware_init(MemoryRegion *rom_memory)
{
    PcSysFwDevice *sysfw_dev;

    sysfw_dev = (PcSysFwDevice*) qdev_create(NULL, "pc-sysfw");

    pc_system_rom_init(rom_memory);
}

static Property pcsysfw_properties[] = {
    DEFINE_PROP_UINT8("rom_only", PcSysFwDevice, rom_only, 1),
    DEFINE_PROP_END_OF_LIST(),
};

static void pcsysfw_class_init (ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS (klass);

    dc->desc = "PC System Firmware";
    dc->props = pcsysfw_properties;
}

static TypeInfo pcsysfw_info = {
    .name          = "pc-sysfw",
    .parent        = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof (PcSysFwDevice),
    .class_init    = pcsysfw_class_init,
};

static void pcsysfw_register (void)
{
    type_register_static (&pcsysfw_info);
}

type_init (pcsysfw_register);