LXR qemu/hw/i386/pc

   1/*
   2 * QEMU PC System Firmware
   3 *
   4 * Copyright (c) 2003-2004 Fabrice Bellard
   5 * Copyright (c) 2011-2012 Intel Corporation
   6 *
   7 * Permission is hereby granted, free of charge, to any person obtaining a copy
   8 * of this software and associated documentation files (the "Software"), to deal
   9 * in the Software without restriction, including without limitation the rights
  10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 * copies of the Software, and to permit persons to whom the Software is
  12 * furnished to do so, subject to the following conditions:
  13 *
  14 * The above copyright notice and this permission notice shall be included in
  15 * all copies or substantial portions of the Software.
  16 *
  17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23 * THE SOFTWARE.
  24 */
  25
  26#include "qemu/osdep.h"
  27#include "qemu-common.h"
  28#include "qapi/error.h"
  29#include "sysemu/block-backend.h"
  30#include "qemu/error-report.h"
  31#include "qemu/option.h"
  32#include "qemu/units.h"
  33#include "hw/sysbus.h"
  34#include "hw/hw.h"
  35#include "hw/i386/pc.h"
  36#include "hw/boards.h"
  37#include "hw/loader.h"
  38#include "sysemu/sysemu.h"
  39#include "hw/block/flash.h"
  40#include "sysemu/kvm.h"
  41
  42#define BIOS_FILENAME "bios.bin"
  43
  44/*
  45 * We don't have a theoretically justifiable exact lower bound on the base
  46 * address of any flash mapping. In practice, the IO-APIC MMIO range is
  47 * [0xFEE00000..0xFEE01000] -- see IO_APIC_DEFAULT_ADDRESS --, leaving free
  48 * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in
  49 * size.
  50 */
  51#define FLASH_SIZE_LIMIT (8 * MiB)
  52
  53#define FLASH_SECTOR_SIZE 4096
  54
  55static void pc_isa_bios_init(MemoryRegion *rom_memory,
  56                             MemoryRegion *flash_mem,
  57                             int ram_size)
  58{
  59    int isa_bios_size;
  60    MemoryRegion *isa_bios;
  61    uint64_t flash_size;
  62    void *flash_ptr, *isa_bios_ptr;
  63
  64    flash_size = memory_region_size(flash_mem);
  65
  66    /* map the last 128KB of the BIOS in ISA space */
  67    isa_bios_size = MIN(flash_size, 128 * KiB);
  68    isa_bios = g_malloc(sizeof(*isa_bios));
  69    memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size,
  70                           &error_fatal);
  71    memory_region_add_subregion_overlap(rom_memory,
  72                                        0x100000 - isa_bios_size,
  73                                        isa_bios,
  74                                        1);
  75
  76    /* copy ISA rom image from top of flash memory */
  77    flash_ptr = memory_region_get_ram_ptr(flash_mem);
  78    isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
  79    memcpy(isa_bios_ptr,
  80           ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
  81           isa_bios_size);
  82
  83    memory_region_set_readonly(isa_bios, true);
  84}
  85
  86static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms,
  87                                     const char *name,
  88                                     const char *alias_prop_name)
  89{
  90    DeviceState *dev = qdev_create(NULL, TYPE_PFLASH_CFI01);
  91
  92    qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE);
  93    qdev_prop_set_uint8(dev, "width", 1);
  94    qdev_prop_set_string(dev, "name", name);
  95    object_property_add_child(OBJECT(pcms), name, OBJECT(dev),
  96                              &error_abort);
  97    object_property_add_alias(OBJECT(pcms), alias_prop_name,
  98                              OBJECT(dev), "drive", &error_abort);
  99    return PFLASH_CFI01(dev);
 100}
 101
 102void pc_system_flash_create(PCMachineState *pcms)
 103{
 104    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
 105
 106    if (pcmc->pci_enabled) {
 107        pcms->flash[0] = pc_pflash_create(pcms, "system.flash0",
 108                                          "pflash0");
 109        pcms->flash[1] = pc_pflash_create(pcms, "system.flash1",
 110                                          "pflash1");
 111    }
 112}
 113
 114static void pc_system_flash_cleanup_unused(PCMachineState *pcms)
 115{
 116    char *prop_name;
 117    int i;
 118    Object *dev_obj;
 119
 120    assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
 121
 122    for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 123        dev_obj = OBJECT(pcms->flash[i]);
 124        if (!object_property_get_bool(dev_obj, "realized", &error_abort)) {
 125            prop_name = g_strdup_printf("pflash%d", i);
 126            object_property_del(OBJECT(pcms), prop_name, &error_abort);
 127            g_free(prop_name);
 128            object_unparent(dev_obj);
 129            pcms->flash[i] = NULL;
 130        }
 131    }
 132}
 133
 134/*
 135 * Map the pcms->flash[] from 4GiB downward, and realize.
 136 * Map them in descending order, i.e. pcms->flash[0] at the top,
 137 * without gaps.
 138 * Stop at the first pcms->flash[0] lacking a block backend.
 139 * Set each flash's size from its block backend.  Fatal error if the
 140 * size isn't a non-zero multiple of 4KiB, or the total size exceeds
 141 * FLASH_SIZE_LIMIT.
 142 *
 143 * If pcms->flash[0] has a block backend, its memory is passed to
 144 * pc_isa_bios_init().  Merging several flash devices for isa-bios is
 145 * not supported.
 146 */
 147static void pc_system_flash_map(PCMachineState *pcms,
 148                                MemoryRegion *rom_memory)
 149{
 150    hwaddr total_size = 0;
 151    int i;
 152    BlockBackend *blk;
 153    int64_t size;
 154    PFlashCFI01 *system_flash;
 155    MemoryRegion *flash_mem;
 156    void *flash_ptr;
 157    int ret, flash_size;
 158
 159    assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
 160
 161    for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 162        system_flash = pcms->flash[i];
 163        blk = pflash_cfi01_get_blk(system_flash);
 164        if (!blk) {
 165            break;
 166        }
 167        size = blk_getlength(blk);
 168        if (size < 0) {
 169            error_report("can't get size of block device %s: %s",
 170                         blk_name(blk), strerror(-size));
 171            exit(1);
 172        }
 173        if (size == 0 || size % FLASH_SECTOR_SIZE != 0) {
 174            error_report("system firmware block device %s has invalid size "
 175                         "%" PRId64,
 176                         blk_name(blk), size);
 177            info_report("its size must be a non-zero multiple of 0x%x",
 178                        FLASH_SECTOR_SIZE);
 179            exit(1);
 180        }
 181        if ((hwaddr)size != size
 182            || total_size > HWADDR_MAX - size
 183            || total_size + size > FLASH_SIZE_LIMIT) {
 184            error_report("combined size of system firmware exceeds "
 185                         "%" PRIu64 " bytes",
 186                         FLASH_SIZE_LIMIT);
 187            exit(1);
 188        }
 189
 190        total_size += size;
 191        qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks",
 192                             size / FLASH_SECTOR_SIZE);
 193        qdev_init_nofail(DEVICE(system_flash));
 194        sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0,
 195                        0x100000000ULL - total_size);
 196
 197        if (i == 0) {
 198            flash_mem = pflash_cfi01_get_memory(system_flash);
 199            pc_isa_bios_init(rom_memory, flash_mem, size);
 200
 201            /* Encrypt the pflash boot ROM */
 202            if (kvm_memcrypt_enabled()) {
 203                flash_ptr = memory_region_get_ram_ptr(flash_mem);
 204                flash_size = memory_region_size(flash_mem);
 205                ret = kvm_memcrypt_encrypt_data(flash_ptr, flash_size);
 206                if (ret) {
 207                    error_report("failed to encrypt pflash rom");
 208                    exit(1);
 209                }
 210            }
 211        }
 212    }
 213}
 214
 215static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
 216{
 217    char *filename;
 218    MemoryRegion *bios, *isa_bios;
 219    int bios_size, isa_bios_size;
 220    int ret;
 221
 222    /* BIOS load */
 223    if (bios_name == NULL) {
 224        bios_name = BIOS_FILENAME;
 225    }
 226    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 227    if (filename) {
 228        bios_size = get_image_size(filename);
 229    } else {
 230        bios_size = -1;
 231    }
 232    if (bios_size <= 0 ||
 233        (bios_size % 65536) != 0) {
 234        goto bios_error;
 235    }
 236    bios = g_malloc(sizeof(*bios));
 237    memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal);
 238    if (!isapc_ram_fw) {
 239        memory_region_set_readonly(bios, true);
 240    }
 241    ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
 242    if (ret != 0) {
 243    bios_error:
 244        fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
 245        exit(1);
 246    }
 247    g_free(filename);
 248
 249    /* map the last 128KB of the BIOS in ISA space */
 250    isa_bios_size = MIN(bios_size, 128 * KiB);
 251    isa_bios = g_malloc(sizeof(*isa_bios));
 252    memory_region_init_alias(isa_bios, NULL, "isa-bios", bios,
 253                             bios_size - isa_bios_size, isa_bios_size);
 254    memory_region_add_subregion_overlap(rom_memory,
 255                                        0x100000 - isa_bios_size,
 256                                        isa_bios,
 257                                        1);
 258    if (!isapc_ram_fw) {
 259        memory_region_set_readonly(isa_bios, true);
 260    }
 261
 262    /* map all the bios at the top of memory */
 263    memory_region_add_subregion(rom_memory,
 264                                (uint32_t)(-bios_size),
 265                                bios);
 266}
 267
 268void pc_system_firmware_init(PCMachineState *pcms,
 269                             MemoryRegion *rom_memory)
 270{
 271    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
 272    int i;
 273    BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)];
 274
 275    if (!pcmc->pci_enabled) {
 276        old_pc_system_rom_init(rom_memory, true);
 277        return;
 278    }
 279
 280    /* Map legacy -drive if=pflash to machine properties */
 281    for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 282        pflash_cfi01_legacy_drive(pcms->flash[i],
 283                                  drive_get(IF_PFLASH, 0, i));
 284        pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]);
 285    }
 286
 287    /* Reject gaps */
 288    for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) {
 289        if (pflash_blk[i] && !pflash_blk[i - 1]) {
 290            error_report("pflash%d requires pflash%d", i, i - 1);
 291            exit(1);
 292        }
 293    }
 294
 295    if (!pflash_blk[0]) {
 296        /* Machine property pflash0 not set, use ROM mode */
 297        old_pc_system_rom_init(rom_memory, false);
 298    } else {
 299        if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
 300            /*
 301             * Older KVM cannot execute from device memory. So, flash
 302             * memory cannot be used unless the readonly memory kvm
 303             * capability is present.
 304             */
 305            error_report("pflash with kvm requires KVM readonly memory support");
 306            exit(1);
 307        }
 308
 309        pc_system_flash_map(pcms, rom_memory);
 310    }
 311
 312    pc_system_flash_cleanup_unused(pcms);
 313}
 314