hw/i386/pc_sysfw.c

   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
  53 static 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
  84 static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms,
  85                                      const char *name,
  86                                      const char *alias_prop_name)
  87 {
  88     DeviceState *dev = qdev_new(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     object_property_add_alias(OBJECT(pcms), alias_prop_name,
  95                               OBJECT(dev), "drive");
  96     return PFLASH_CFI01(dev);
  97 }
  98
  99 void pc_system_flash_create(PCMachineState *pcms)
 100 {
 101     PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
 102
 103     if (pcmc->pci_enabled) {
 104         pcms->flash[0] = pc_pflash_create(pcms, "system.flash0",
 105                                           "pflash0");
 106         pcms->flash[1] = pc_pflash_create(pcms, "system.flash1",
 107                                           "pflash1");
 108     }
 109 }
 110
 111 static void pc_system_flash_cleanup_unused(PCMachineState *pcms)
 112 {
 113     char *prop_name;
 114     int i;
 115     Object *dev_obj;
 116
 117     assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
 118
 119     for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 120         dev_obj = OBJECT(pcms->flash[i]);
 121         if (!object_property_get_bool(dev_obj, "realized", &error_abort)) {
 122             prop_name = g_strdup_printf("pflash%d", i);
 123             object_property_del(OBJECT(pcms), prop_name);
 124             g_free(prop_name);
 125             object_unparent(dev_obj);
 126             pcms->flash[i] = NULL;
 127         }
 128     }
 129 }
 130
 131 /*
 132  * Map the pcms->flash[] from 4GiB downward, and realize.
 133  * Map them in descending order, i.e. pcms->flash[0] at the top,
 134  * without gaps.
 135  * Stop at the first pcms->flash[0] lacking a block backend.
 136  * Set each flash's size from its block backend.  Fatal error if the
 137  * size isn't a non-zero multiple of 4KiB, or the total size exceeds
 138  * FLASH_SIZE_LIMIT.
 139  *
 140  * If pcms->flash[0] has a block backend, its memory is passed to
 141  * pc_isa_bios_init().  Merging several flash devices for isa-bios is
 142  * not supported.
 143  */
 144 static void pc_system_flash_map(PCMachineState *pcms,
 145                                 MemoryRegion *rom_memory)
 146 {
 147     hwaddr total_size = 0;
 148     int i;
 149     BlockBackend *blk;
 150     int64_t size;
 151     PFlashCFI01 *system_flash;
 152     MemoryRegion *flash_mem;
 153     void *flash_ptr;
 154     int ret, flash_size;
 155
 156     assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
 157
 158     for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 159         system_flash = pcms->flash[i];
 160         blk = pflash_cfi01_get_blk(system_flash);
 161         if (!blk) {
 162             break;
 163         }
 164         size = blk_getlength(blk);
 165         if (size < 0) {
 166             error_report("can't get size of block device %s: %s",
 167                          blk_name(blk), strerror(-size));
 168             exit(1);
 169         }
 170         if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) {
 171             error_report("system firmware block device %s has invalid size "
 172                          "%" PRId64,
 173                          blk_name(blk), size);
 174             info_report("its size must be a non-zero multiple of 0x%x",
 175                         FLASH_SECTOR_SIZE);
 176             exit(1);
 177         }
 178         if ((hwaddr)size != size
 179             || total_size > HWADDR_MAX - size
 180             || total_size + size > FLASH_SIZE_LIMIT) {
 181             error_report("combined size of system firmware exceeds "
 182                          "%" PRIu64 " bytes",
 183                          FLASH_SIZE_LIMIT);
 184             exit(1);
 185         }
 186
 187         total_size += size;
 188         qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks",
 189                              size / FLASH_SECTOR_SIZE);
 190         sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal);
 191         sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0,
 192                         0x100000000ULL - total_size);
 193
 194         if (i == 0) {
 195             flash_mem = pflash_cfi01_get_memory(system_flash);
 196             pc_isa_bios_init(rom_memory, flash_mem, size);
 197
 198             /* Encrypt the pflash boot ROM */
 199             if (kvm_memcrypt_enabled()) {
 200                 flash_ptr = memory_region_get_ram_ptr(flash_mem);
 201                 flash_size = memory_region_size(flash_mem);
 202                 ret = kvm_memcrypt_encrypt_data(flash_ptr, flash_size);
 203                 if (ret) {
 204                     error_report("failed to encrypt pflash rom");
 205                     exit(1);
 206                 }
 207             }
 208         }
 209     }
 210 }
 211
 212 void pc_system_firmware_init(PCMachineState *pcms,
 213                              MemoryRegion *rom_memory)
 214 {
 215     PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
 216     int i;
 217     BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)];
 218
 219     if (!pcmc->pci_enabled) {
 220         x86_bios_rom_init(rom_memory, true);
 221         return;
 222     }
 223
 224     /* Map legacy -drive if=pflash to machine properties */
 225     for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 226         pflash_cfi01_legacy_drive(pcms->flash[i],
 227                                   drive_get(IF_PFLASH, 0, i));
 228         pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]);
 229     }
 230
 231     /* Reject gaps */
 232     for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) {
 233         if (pflash_blk[i] && !pflash_blk[i - 1]) {
 234             error_report("pflash%d requires pflash%d", i, i - 1);
 235             exit(1);
 236         }
 237     }
 238
 239     if (!pflash_blk[0]) {
 240         /* Machine property pflash0 not set, use ROM mode */
 241         x86_bios_rom_init(rom_memory, false);
 242     } else {
 243         if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
 244             /*
 245              * Older KVM cannot execute from device memory. So, flash
 246              * memory cannot be used unless the readonly memory kvm
 247              * capability is present.
 248              */
 249             error_report("pflash with kvm requires KVM readonly memory support");
 250             exit(1);
 251         }
 252
 253         pc_system_flash_map(pcms, rom_memory);
 254     }
 255
 256     pc_system_flash_cleanup_unused(pcms);
 257 }