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