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 "hw/sysbus.h"
  31 #include "hw/hw.h"
  32 #include "hw/i386/pc.h"
  33 #include "hw/boards.h"
  34 #include "hw/loader.h"
  35 #include "sysemu/sysemu.h"
  36 #include "hw/block/flash.h"
  37 #include "sysemu/kvm.h"
  38
  39 #define BIOS_FILENAME "bios.bin"
  40
  41 typedef struct PcSysFwDevice {
  42     SysBusDevice busdev;
  43     uint8_t isapc_ram_fw;
  44 } PcSysFwDevice;
  45
  46 static void pc_isa_bios_init(MemoryRegion *rom_memory,
  47                              MemoryRegion *flash_mem,
  48                              int ram_size)
  49 {
  50     int isa_bios_size;
  51     MemoryRegion *isa_bios;
  52     uint64_t flash_size;
  53     void *flash_ptr, *isa_bios_ptr;
  54
  55     flash_size = memory_region_size(flash_mem);
  56
  57     /* map the last 128KB of the BIOS in ISA space */
  58     isa_bios_size = MIN(flash_size, 128 * 1024);
  59     isa_bios = g_malloc(sizeof(*isa_bios));
  60     memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size,
  61                            &error_fatal);
  62     vmstate_register_ram_global(isa_bios);
  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
 117     sector_bits = 12;
 118     sector_size = 1 << sector_bits;
 119
 120     for (unit = 0;
 121          (unit < FLASH_MAP_UNIT_MAX &&
 122           (pflash_drv = drive_get(IF_PFLASH, 0, unit)) != NULL);
 123          ++unit) {
 124         blk = blk_by_legacy_dinfo(pflash_drv);
 125         size = blk_getlength(blk);
 126         if (size < 0) {
 127             fatal_errmsg = g_strdup_printf("failed to get backing file size");
 128         } else if (size == 0) {
 129             fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
 130                                "cannot have zero size");
 131         } else if ((size % sector_size) != 0) {
 132             fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
 133                                "must be a multiple of 0x%x", sector_size);
 134         } else if (phys_addr < size || phys_addr - size < FLASH_MAP_BASE_MIN) {
 135             fatal_errmsg = g_strdup_printf("oversized backing file, pflash "
 136                                "segments cannot be mapped under "
 137                                TARGET_FMT_plx, FLASH_MAP_BASE_MIN);
 138         }
 139         if (fatal_errmsg != NULL) {
 140             Location loc;
 141
 142             /* push a new, "none" location on the location stack; overwrite its
 143              * contents with the location saved in the option; print the error
 144              * (includes location); pop the top
 145              */
 146             loc_push_none(&loc);
 147             if (pflash_drv->opts != NULL) {
 148                 qemu_opts_loc_restore(pflash_drv->opts);
 149             }
 150             error_report("%s", fatal_errmsg);
 151             loc_pop(&loc);
 152             g_free(fatal_errmsg);
 153             exit(1);
 154         }
 155
 156         phys_addr -= size;
 157
 158         /* pflash_cfi01_register() creates a deep copy of the name */
 159         snprintf(name, sizeof name, "system.flash%d", unit);
 160         system_flash = pflash_cfi01_register(phys_addr, NULL /* qdev */, name,
 161                                              size, blk, sector_size,
 162                                              size >> sector_bits,
 163                                              1      /* width */,
 164                                              0x0000 /* id0 */,
 165                                              0x0000 /* id1 */,
 166                                              0x0000 /* id2 */,
 167                                              0x0000 /* id3 */,
 168                                              0      /* be */);
 169         if (unit == 0) {
 170             flash_mem = pflash_cfi01_get_memory(system_flash);
 171             pc_isa_bios_init(rom_memory, flash_mem, size);
 172         }
 173     }
 174 }
 175
 176 static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
 177 {
 178     char *filename;
 179     MemoryRegion *bios, *isa_bios;
 180     int bios_size, isa_bios_size;
 181     int ret;
 182
 183     /* BIOS load */
 184     if (bios_name == NULL) {
 185         bios_name = BIOS_FILENAME;
 186     }
 187     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 188     if (filename) {
 189         bios_size = get_image_size(filename);
 190     } else {
 191         bios_size = -1;
 192     }
 193     if (bios_size <= 0 ||
 194         (bios_size % 65536) != 0) {
 195         goto bios_error;
 196     }
 197     bios = g_malloc(sizeof(*bios));
 198     memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal);
 199     vmstate_register_ram_global(bios);
 200     if (!isapc_ram_fw) {
 201         memory_region_set_readonly(bios, true);
 202     }
 203     ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
 204     if (ret != 0) {
 205     bios_error:
 206         fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
 207         exit(1);
 208     }
 209     g_free(filename);
 210
 211     /* map the last 128KB of the BIOS in ISA space */
 212     isa_bios_size = bios_size;
 213     if (isa_bios_size > (128 * 1024)) {
 214         isa_bios_size = 128 * 1024;
 215     }
 216     isa_bios = g_malloc(sizeof(*isa_bios));
 217     memory_region_init_alias(isa_bios, NULL, "isa-bios", bios,
 218                              bios_size - isa_bios_size, isa_bios_size);
 219     memory_region_add_subregion_overlap(rom_memory,
 220                                         0x100000 - isa_bios_size,
 221                                         isa_bios,
 222                                         1);
 223     if (!isapc_ram_fw) {
 224         memory_region_set_readonly(isa_bios, true);
 225     }
 226
 227     /* map all the bios at the top of memory */
 228     memory_region_add_subregion(rom_memory,
 229                                 (uint32_t)(-bios_size),
 230                                 bios);
 231 }
 232
 233 void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
 234 {
 235     DriveInfo *pflash_drv;
 236
 237     pflash_drv = drive_get(IF_PFLASH, 0, 0);
 238
 239     if (isapc_ram_fw || pflash_drv == NULL) {
 240         /* When a pflash drive is not found, use rom-mode */
 241         old_pc_system_rom_init(rom_memory, isapc_ram_fw);
 242         return;
 243     }
 244
 245     if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
 246         /* Older KVM cannot execute from device memory. So, flash memory
 247          * cannot be used unless the readonly memory kvm capability is present. */
 248         fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n");
 249         exit(1);
 250     }
 251
 252     pc_system_flash_init(rom_memory);
 253 }