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 "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
  42 typedef struct PcSysFwDevice {
  43     SysBusDevice busdev;
  44     uint8_t isapc_ram_fw;
  45 } PcSysFwDevice;
  46
  47 static 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  */
 104 static 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
 189 static 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
 245 void 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 }