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/i386/x86.h"
  35#include "hw/i386/pc.h"
  36#include "hw/loader.h"
  37#include "hw/qdev-properties.h"
  38#include "sysemu/sysemu.h"
  39#include "hw/block/flash.h"
  40#include "sysemu/kvm.h"
  41
  42/*
  43 * We don't have a theoretically justifiable exact lower bound on the base
  44 * address of any flash mapping. In practice, the IO-APIC MMIO range is
  45 * [0xFEE00000..0xFEE01000] -- see IO_APIC_DEFAULT_ADDRESS --, leaving free
  46 * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in
  47 * size.
  48 */
  49#define FLASH_SIZE_LIMIT (8 * MiB)
  50
  51#define FLASH_SECTOR_SIZE 4096
  52
  53static void pc_isa_bios_init(MemoryRegion *rom_memory,
  54                             MemoryRegion *flash_mem,
  55                             int ram_size)
  56{
  57    int isa_bios_size;
  58    MemoryRegion *isa_bios;
  59    uint64_t flash_size;
  60    void *flash_ptr, *isa_bios_ptr;
  61
  62    flash_size = memory_region_size(flash_mem);
  63
  64    /* map the last 128KB of the BIOS in ISA space */
  65    isa_bios_size = MIN(flash_size, 128 * KiB);
  66    isa_bios = g_malloc(sizeof(*isa_bios));
  67    memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size,
  68                           &error_fatal);
  69    memory_region_add_subregion_overlap(rom_memory,
  70                                        0x100000 - isa_bios_size,
  71                                        isa_bios,
  72                                        1);
  73
  74    /* copy ISA rom image from top of flash memory */
  75    flash_ptr = memory_region_get_ram_ptr(flash_mem);
  76    isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
  77    memcpy(isa_bios_ptr,
  78           ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
  79           isa_bios_size);
  80
  81    memory_region_set_readonly(isa_bios, true);
  82}
  83
  84static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms,
  85                                     const char *name,
  86                                     const char *alias_prop_name)
  87{
  88    DeviceState *dev = qdev_create(NULL, TYPE_PFLASH_CFI01);
  89
  90    qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE);
  91    qdev_prop_set_uint8(dev, "width", 1);
  92    qdev_prop_set_string(dev, "name", name);
  93    object_property_add_child(OBJECT(pcms), name, OBJECT(dev),
  94                              &error_abort);
  95    object_property_add_alias(OBJECT(pcms), alias_prop_name,
  96                              OBJECT(dev), "drive", &error_abort);
  97    return PFLASH_CFI01(dev);
  98}
  99
 100void pc_system_flash_create(PCMachineState *pcms)
 101{
 102    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
 103
 104    if (pcmc->pci_enabled) {
 105        pcms->flash[0] = pc_pflash_create(pcms, "system.flash0",
 106                                          "pflash0");
 107        pcms->flash[1] = pc_pflash_create(pcms, "system.flash1",
 108                                          "pflash1");
 109    }
 110}
 111
 112static void pc_system_flash_cleanup_unused(PCMachineState *pcms)
 113{
 114    char *prop_name;
 115    int i;
 116    Object *dev_obj;
 117
 118    assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
 119
 120    for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 121        dev_obj = OBJECT(pcms->flash[i]);
 122        if (!object_property_get_bool(dev_obj, "realized", &error_abort)) {
 123            prop_name = g_strdup_printf("pflash%d", i);
 124            object_property_del(OBJECT(pcms), prop_name, &error_abort);
 125            g_free(prop_name);
 126            object_unparent(dev_obj);
 127            pcms->flash[i] = NULL;
 128        }
 129    }
 130}
 131
 132/*
 133 * Map the pcms->flash[] from 4GiB downward, and realize.
 134 * Map them in descending order, i.e. pcms->flash[0] at the top,
 135 * without gaps.
 136 * Stop at the first pcms->flash[0] lacking a block backend.
 137 * Set each flash's size from its block backend.  Fatal error if the
 138 * size isn't a non-zero multiple of 4KiB, or the total size exceeds
 139 * FLASH_SIZE_LIMIT.
 140 *
 141 * If pcms->flash[0] has a block backend, its memory is passed to
 142 * pc_isa_bios_init().  Merging several flash devices for isa-bios is
 143 * not supported.
 144 */
 145static void pc_system_flash_map(PCMachineState *pcms,
 146                                MemoryRegion *rom_memory)
 147{
 148    hwaddr total_size = 0;
 149    int i;
 150    BlockBackend *blk;
 151    int64_t size;
 152    PFlashCFI01 *system_flash;
 153    MemoryRegion *flash_mem;
 154    void *flash_ptr;
 155    int ret, flash_size;
 156
 157    assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
 158
 159    for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 160        system_flash = pcms->flash[i];
 161        blk = pflash_cfi01_get_blk(system_flash);
 162        if (!blk) {
 163            break;
 164        }
 165        size = blk_getlength(blk);
 166        if (size < 0) {
 167            error_report("can't get size of block device %s: %s",
 168                         blk_name(blk), strerror(-size));
 169            exit(1);
 170        }
 171        if (size == 0 || size % FLASH_SECTOR_SIZE != 0) {
 172            error_report("system firmware block device %s has invalid size "
 173                         "%" PRId64,
 174                         blk_name(blk), size);
 175            info_report("its size must be a non-zero multiple of 0x%x",
 176                        FLASH_SECTOR_SIZE);
 177            exit(1);
 178        }
 179        if ((hwaddr)size != size
 180            || total_size > HWADDR_MAX - size
 181            || total_size + size > FLASH_SIZE_LIMIT) {
 182            error_report("combined size of system firmware exceeds "
 183                         "%" PRIu64 " bytes",
 184                         FLASH_SIZE_LIMIT);
 185            exit(1);
 186        }
 187
 188        total_size += size;
 189        qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks",
 190                             size / FLASH_SECTOR_SIZE);
 191        qdev_init_nofail(DEVICE(system_flash));
 192        sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0,
 193                        0x100000000ULL - total_size);
 194
 195        if (i == 0) {
 196            flash_mem = pflash_cfi01_get_memory(system_flash);
 197            pc_isa_bios_init(rom_memory, flash_mem, size);
 198
 199            /* Encrypt the pflash boot ROM */
 200            if (kvm_memcrypt_enabled()) {
 201                flash_ptr = memory_region_get_ram_ptr(flash_mem);
 202                flash_size = memory_region_size(flash_mem);
 203                ret = kvm_memcrypt_encrypt_data(flash_ptr, flash_size);
 204                if (ret) {
 205                    error_report("failed to encrypt pflash rom");
 206                    exit(1);
 207                }
 208            }
 209        }
 210    }
 211}
 212
 213void pc_system_firmware_init(PCMachineState *pcms,
 214                             MemoryRegion *rom_memory)
 215{
 216    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
 217    int i;
 218    BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)];
 219
 220    if (!pcmc->pci_enabled) {
 221        x86_bios_rom_init(rom_memory, true);
 222        return;
 223    }
 224
 225    /* Map legacy -drive if=pflash to machine properties */
 226    for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 227        pflash_cfi01_legacy_drive(pcms->flash[i],
 228                                  drive_get(IF_PFLASH, 0, i));
 229        pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]);
 230    }
 231
 232    /* Reject gaps */
 233    for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) {
 234        if (pflash_blk[i] && !pflash_blk[i - 1]) {
 235            error_report("pflash%d requires pflash%d", i, i - 1);
 236            exit(1);
 237        }
 238    }
 239
 240    if (!pflash_blk[0]) {
 241        /* Machine property pflash0 not set, use ROM mode */
 242        x86_bios_rom_init(rom_memory, false);
 243    } else {
 244        if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
 245            /*
 246             * Older KVM cannot execute from device memory. So, flash
 247             * memory cannot be used unless the readonly memory kvm
 248             * capability is present.
 249             */
 250            error_report("pflash with kvm requires KVM readonly memory support");
 251            exit(1);
 252        }
 253
 254        pc_system_flash_map(pcms, rom_memory);
 255    }
 256
 257    pc_system_flash_cleanup_unused(pcms);
 258}
 259