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     memory_region_add_subregion_overlap(rom_memory,
  63                                         0x100000 - isa_bios_size,
  64                                         isa_bios,
  65                                         1);
  66
  67     /* copy ISA rom image from top of flash memory */
  68     flash_ptr = memory_region_get_ram_ptr(flash_mem);
  69     isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
  70     memcpy(isa_bios_ptr,
  71            ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
  72            isa_bios_size);
  73
  74     memory_region_set_readonly(isa_bios, true);
  75 }
  76
  77 #define FLASH_MAP_UNIT_MAX 2
  78
  79 /* We don't have a theoretically justifiable exact lower bound on the base
  80  * address of any flash mapping. In practice, the IO-APIC MMIO range is
  81  * [0xFEE00000..0xFEE01000[ -- see IO_APIC_DEFAULT_ADDRESS --, leaving free
  82  * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in
  83  * size.
  84  */
  85 #define FLASH_MAP_BASE_MIN ((hwaddr)(0x100000000ULL - 8*1024*1024))
  86
  87 /* This function maps flash drives from 4G downward, in order of their unit
  88  * numbers. The mapping starts at unit#0, with unit number increments of 1, and
  89  * stops before the first missing flash drive, or before
  90  * unit#FLASH_MAP_UNIT_MAX, whichever is reached first.
  91  *
  92  * Addressing within one flash drive is of course not reversed.
  93  *
  94  * An error message is printed and the process exits if:
  95  * - the size of the backing file for a flash drive is non-positive, or not a
  96  *   multiple of the required sector size, or
  97  * - the current mapping's base address would fall below FLASH_MAP_BASE_MIN.
  98  *
  99  * The drive with unit#0 (if available) is mapped at the highest address, and
 100  * it is passed to pc_isa_bios_init(). Merging several drives for isa-bios is
 101  * not supported.
 102  */
 103 static void pc_system_flash_init(MemoryRegion *rom_memory)
 104 {
 105     int unit;
 106     DriveInfo *pflash_drv;
 107     BlockBackend *blk;
 108     int64_t size;
 109     char *fatal_errmsg = NULL;
 110     hwaddr phys_addr = 0x100000000ULL;
 111     int sector_bits, sector_size;
 112     pflash_t *system_flash;
 113     MemoryRegion *flash_mem;
 114     char name[64];
 115
 116     sector_bits = 12;
 117     sector_size = 1 << sector_bits;
 118
 119     for (unit = 0;
 120          (unit < FLASH_MAP_UNIT_MAX &&
 121           (pflash_drv = drive_get(IF_PFLASH, 0, unit)) != NULL);
 122          ++unit) {
 123         blk = blk_by_legacy_dinfo(pflash_drv);
 124         size = blk_getlength(blk);
 125         if (size < 0) {
 126             fatal_errmsg = g_strdup_printf("failed to get backing file size");
 127         } else if (size == 0) {
 128             fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
 129                                "cannot have zero size");
 130         } else if ((size % sector_size) != 0) {
 131             fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
 132                                "must be a multiple of 0x%x", sector_size);
 133         } else if (phys_addr < size || phys_addr - size < FLASH_MAP_BASE_MIN) {
 134             fatal_errmsg = g_strdup_printf("oversized backing file, pflash "
 135                                "segments cannot be mapped under "
 136                                TARGET_FMT_plx, FLASH_MAP_BASE_MIN);
 137         }
 138         if (fatal_errmsg != NULL) {
 139             Location loc;
 140
 141             /* push a new, "none" location on the location stack; overwrite its
 142              * contents with the location saved in the option; print the error
 143              * (includes location); pop the top
 144              */
 145             loc_push_none(&loc);
 146             if (pflash_drv->opts != NULL) {
 147                 qemu_opts_loc_restore(pflash_drv->opts);
 148             }
 149             error_report("%s", fatal_errmsg);
 150             loc_pop(&loc);
 151             g_free(fatal_errmsg);
 152             exit(1);
 153         }
 154
 155         phys_addr -= size;
 156
 157         /* pflash_cfi01_register() creates a deep copy of the name */
 158         snprintf(name, sizeof name, "system.flash%d", unit);
 159         system_flash = pflash_cfi01_register(phys_addr, NULL /* qdev */, name,
 160                                              size, blk, sector_size,
 161                                              size >> sector_bits,
 162                                              1      /* width */,
 163                                              0x0000 /* id0 */,
 164                                              0x0000 /* id1 */,
 165                                              0x0000 /* id2 */,
 166                                              0x0000 /* id3 */,
 167                                              0      /* be */);
 168         if (unit == 0) {
 169             flash_mem = pflash_cfi01_get_memory(system_flash);
 170             pc_isa_bios_init(rom_memory, flash_mem, size);
 171         }
 172     }
 173 }
 174
 175 static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
 176 {
 177     char *filename;
 178     MemoryRegion *bios, *isa_bios;
 179     int bios_size, isa_bios_size;
 180     int ret;
 181
 182     /* BIOS load */
 183     if (bios_name == NULL) {
 184         bios_name = BIOS_FILENAME;
 185     }
 186     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 187     if (filename) {
 188         bios_size = get_image_size(filename);
 189     } else {
 190         bios_size = -1;
 191     }
 192     if (bios_size <= 0 ||
 193         (bios_size % 65536) != 0) {
 194         goto bios_error;
 195     }
 196     bios = g_malloc(sizeof(*bios));
 197     memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal);
 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
 231 void 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 }