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