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 "qapi/error.h"
  28#include "sysemu/block-backend.h"
  29#include "qemu/error-report.h"
  30#include "qemu/option.h"
  31#include "hw/sysbus.h"
  32#include "hw/hw.h"
  33#include "hw/i386/pc.h"
  34#include "hw/boards.h"
  35#include "hw/loader.h"
  36#include "sysemu/sysemu.h"
  37#include "hw/block/flash.h"
  38#include "sysemu/kvm.h"
  39
  40#define BIOS_FILENAME "bios.bin"
  41
  42typedef struct PcSysFwDevice {
  43    SysBusDevice busdev;
  44    uint8_t isapc_ram_fw;
  45} PcSysFwDevice;
  46
  47static void pc_isa_bios_init(MemoryRegion *rom_memory,
  48                             MemoryRegion *flash_mem,
  49                             int ram_size)
  50{
  51    int isa_bios_size;
  52    MemoryRegion *isa_bios;
  53    uint64_t flash_size;
  54    void *flash_ptr, *isa_bios_ptr;
  55
  56    flash_size = memory_region_size(flash_mem);
  57
  58    /* map the last 128KB of the BIOS in ISA space */
  59    isa_bios_size = MIN(flash_size, 128 * 1024);
  60    isa_bios = g_malloc(sizeof(*isa_bios));
  61    memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size,
  62                           &error_fatal);
  63    memory_region_add_subregion_overlap(rom_memory,
  64                                        0x100000 - isa_bios_size,
  65                                        isa_bios,
  66                                        1);
  67
  68    /* copy ISA rom image from top of flash memory */
  69    flash_ptr = memory_region_get_ram_ptr(flash_mem);
  70    isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
  71    memcpy(isa_bios_ptr,
  72           ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
  73           isa_bios_size);
  74
  75    memory_region_set_readonly(isa_bios, true);
  76}
  77
  78#define FLASH_MAP_UNIT_MAX 2
  79
  80/* We don't have a theoretically justifiable exact lower bound on the base
  81 * address of any flash mapping. In practice, the IO-APIC MMIO range is
  82 * [0xFEE00000..0xFEE01000[ -- see IO_APIC_DEFAULT_ADDRESS --, leaving free
  83 * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in
  84 * size.
  85 */
  86#define FLASH_MAP_BASE_MIN ((hwaddr)(0x100000000ULL - 8*1024*1024))
  87
  88/* This function maps flash drives from 4G downward, in order of their unit
  89 * numbers. The mapping starts at unit#0, with unit number increments of 1, and
  90 * stops before the first missing flash drive, or before
  91 * unit#FLASH_MAP_UNIT_MAX, whichever is reached first.
  92 *
  93 * Addressing within one flash drive is of course not reversed.
  94 *
  95 * An error message is printed and the process exits if:
  96 * - the size of the backing file for a flash drive is non-positive, or not a
  97 *   multiple of the required sector size, or
  98 * - the current mapping's base address would fall below FLASH_MAP_BASE_MIN.
  99 *
 100 * The drive with unit#0 (if available) is mapped at the highest address, and
 101 * it is passed to pc_isa_bios_init(). Merging several drives for isa-bios is
 102 * not supported.
 103 */
 104static void pc_system_flash_init(MemoryRegion *rom_memory)
 105{
 106    int unit;
 107    DriveInfo *pflash_drv;
 108    BlockBackend *blk;
 109    int64_t size;
 110    char *fatal_errmsg = NULL;
 111    hwaddr phys_addr = 0x100000000ULL;
 112    int sector_bits, sector_size;
 113    pflash_t *system_flash;
 114    MemoryRegion *flash_mem;
 115    char name[64];
 116    void *flash_ptr;
 117    int ret, flash_size;
 118
 119    sector_bits = 12;
 120    sector_size = 1 << sector_bits;
 121
 122    for (unit = 0;
 123         (unit < FLASH_MAP_UNIT_MAX &&
 124          (pflash_drv = drive_get(IF_PFLASH, 0, unit)) != NULL);
 125         ++unit) {
 126        blk = blk_by_legacy_dinfo(pflash_drv);
 127        size = blk_getlength(blk);
 128        if (size < 0) {
 129            fatal_errmsg = g_strdup_printf("failed to get backing file size");
 130        } else if (size == 0) {
 131            fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
 132                               "cannot have zero size");
 133        } else if ((size % sector_size) != 0) {
 134            fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
 135                               "must be a multiple of 0x%x", sector_size);
 136        } else if (phys_addr < size || phys_addr - size < FLASH_MAP_BASE_MIN) {
 137            fatal_errmsg = g_strdup_printf("oversized backing file, pflash "
 138                               "segments cannot be mapped under "
 139                               TARGET_FMT_plx, FLASH_MAP_BASE_MIN);
 140        }
 141        if (fatal_errmsg != NULL) {
 142            Location loc;
 143
 144            /* push a new, "none" location on the location stack; overwrite its
 145             * contents with the location saved in the option; print the error
 146             * (includes location); pop the top
 147             */
 148            loc_push_none(&loc);
 149            if (pflash_drv->opts != NULL) {
 150                qemu_opts_loc_restore(pflash_drv->opts);
 151            }
 152            error_report("%s", fatal_errmsg);
 153            loc_pop(&loc);
 154            g_free(fatal_errmsg);
 155            exit(1);
 156        }
 157
 158        phys_addr -= size;
 159
 160        /* pflash_cfi01_register() creates a deep copy of the name */
 161        snprintf(name, sizeof name, "system.flash%d", unit);
 162        system_flash = pflash_cfi01_register(phys_addr, NULL /* qdev */, name,
 163                                             size, blk, sector_size,
 164                                             size >> sector_bits,
 165                                             1      /* width */,
 166                                             0x0000 /* id0 */,
 167                                             0x0000 /* id1 */,
 168                                             0x0000 /* id2 */,
 169                                             0x0000 /* id3 */,
 170                                             0      /* be */);
 171        if (unit == 0) {
 172            flash_mem = pflash_cfi01_get_memory(system_flash);
 173            pc_isa_bios_init(rom_memory, flash_mem, size);
 174
 175            /* Encrypt the pflash boot ROM */
 176            if (kvm_memcrypt_enabled()) {
 177                flash_ptr = memory_region_get_ram_ptr(flash_mem);
 178                flash_size = memory_region_size(flash_mem);
 179                ret = kvm_memcrypt_encrypt_data(flash_ptr, flash_size);
 180                if (ret) {
 181                    error_report("failed to encrypt pflash rom");
 182                    exit(1);
 183                }
 184            }
 185        }
 186    }
 187}
 188
 189static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
 190{
 191    char *filename;
 192    MemoryRegion *bios, *isa_bios;
 193    int bios_size, isa_bios_size;
 194    int ret;
 195
 196    /* BIOS load */
 197    if (bios_name == NULL) {
 198        bios_name = BIOS_FILENAME;
 199    }
 200    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 201    if (filename) {
 202        bios_size = get_image_size(filename);
 203    } else {
 204        bios_size = -1;
 205    }
 206    if (bios_size <= 0 ||
 207        (bios_size % 65536) != 0) {
 208        goto bios_error;
 209    }
 210    bios = g_malloc(sizeof(*bios));
 211    memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal);
 212    if (!isapc_ram_fw) {
 213        memory_region_set_readonly(bios, true);
 214    }
 215    ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
 216    if (ret != 0) {
 217    bios_error:
 218        fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
 219        exit(1);
 220    }
 221    g_free(filename);
 222
 223    /* map the last 128KB of the BIOS in ISA space */
 224    isa_bios_size = bios_size;
 225    if (isa_bios_size > (128 * 1024)) {
 226        isa_bios_size = 128 * 1024;
 227    }
 228    isa_bios = g_malloc(sizeof(*isa_bios));
 229    memory_region_init_alias(isa_bios, NULL, "isa-bios", bios,
 230                             bios_size - isa_bios_size, isa_bios_size);
 231    memory_region_add_subregion_overlap(rom_memory,
 232                                        0x100000 - isa_bios_size,
 233                                        isa_bios,
 234                                        1);
 235    if (!isapc_ram_fw) {
 236        memory_region_set_readonly(isa_bios, true);
 237    }
 238
 239    /* map all the bios at the top of memory */
 240    memory_region_add_subregion(rom_memory,
 241                                (uint32_t)(-bios_size),
 242                                bios);
 243}
 244
 245void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
 246{
 247    DriveInfo *pflash_drv;
 248
 249    pflash_drv = drive_get(IF_PFLASH, 0, 0);
 250
 251    if (isapc_ram_fw || pflash_drv == NULL) {
 252        /* When a pflash drive is not found, use rom-mode */
 253        old_pc_system_rom_init(rom_memory, isapc_ram_fw);
 254        return;
 255    }
 256
 257    if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
 258        /* Older KVM cannot execute from device memory. So, flash memory
 259         * cannot be used unless the readonly memory kvm capability is present. */
 260        fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n");
 261        exit(1);
 262    }
 263
 264    pc_system_flash_init(rom_memory);
 265}
 266