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 "qemu/units.h" 32 #include "hw/sysbus.h" 33 #include "hw/hw.h" 34 #include "hw/i386/pc.h" 35 #include "hw/boards.h" 36 #include "hw/loader.h" 37 #include "sysemu/sysemu.h" 38 #include "hw/block/flash.h" 39 #include "sysemu/kvm.h" 40 41 #define BIOS_FILENAME "bios.bin" 42 43 typedef struct PcSysFwDevice { 44 SysBusDevice busdev; 45 uint8_t isapc_ram_fw; 46 } PcSysFwDevice; 47 48 static void pc_isa_bios_init(MemoryRegion *rom_memory, 49 MemoryRegion *flash_mem, 50 int ram_size) 51 { 52 int isa_bios_size; 53 MemoryRegion *isa_bios; 54 uint64_t flash_size; 55 void *flash_ptr, *isa_bios_ptr; 56 57 flash_size = memory_region_size(flash_mem); 58 59 /* map the last 128KB of the BIOS in ISA space */ 60 isa_bios_size = MIN(flash_size, 128 * KiB); 61 isa_bios = g_malloc(sizeof(*isa_bios)); 62 memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, 63 &error_fatal); 64 memory_region_add_subregion_overlap(rom_memory, 65 0x100000 - isa_bios_size, 66 isa_bios, 67 1); 68 69 /* copy ISA rom image from top of flash memory */ 70 flash_ptr = memory_region_get_ram_ptr(flash_mem); 71 isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); 72 memcpy(isa_bios_ptr, 73 ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), 74 isa_bios_size); 75 76 memory_region_set_readonly(isa_bios, true); 77 } 78 79 #define FLASH_MAP_UNIT_MAX 2 80 81 /* We don't have a theoretically justifiable exact lower bound on the base 82 * address of any flash mapping. In practice, the IO-APIC MMIO range is 83 * [0xFEE00000..0xFEE01000[ -- see IO_APIC_DEFAULT_ADDRESS --, leaving free 84 * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in 85 * size. 86 */ 87 #define FLASH_MAP_BASE_MIN ((hwaddr)(4 * GiB - 8 * MiB)) 88 89 /* This function maps flash drives from 4G downward, in order of their unit 90 * numbers. The mapping starts at unit#0, with unit number increments of 1, and 91 * stops before the first missing flash drive, or before 92 * unit#FLASH_MAP_UNIT_MAX, whichever is reached first. 93 * 94 * Addressing within one flash drive is of course not reversed. 95 * 96 * An error message is printed and the process exits if: 97 * - the size of the backing file for a flash drive is non-positive, or not a 98 * multiple of the required sector size, or 99 * - the current mapping's base address would fall below FLASH_MAP_BASE_MIN. 100 * 101 * The drive with unit#0 (if available) is mapped at the highest address, and 102 * it is passed to pc_isa_bios_init(). Merging several drives for isa-bios is 103 * not supported. 104 */ 105 static void pc_system_flash_init(MemoryRegion *rom_memory) 106 { 107 int unit; 108 DriveInfo *pflash_drv; 109 BlockBackend *blk; 110 int64_t size; 111 char *fatal_errmsg = NULL; 112 hwaddr phys_addr = 0x100000000ULL; 113 int sector_bits, sector_size; 114 pflash_t *system_flash; 115 MemoryRegion *flash_mem; 116 char name[64]; 117 void *flash_ptr; 118 int ret, flash_size; 119 120 sector_bits = 12; 121 sector_size = 1 << sector_bits; 122 123 for (unit = 0; 124 (unit < FLASH_MAP_UNIT_MAX && 125 (pflash_drv = drive_get(IF_PFLASH, 0, unit)) != NULL); 126 ++unit) { 127 blk = blk_by_legacy_dinfo(pflash_drv); 128 size = blk_getlength(blk); 129 if (size < 0) { 130 fatal_errmsg = g_strdup_printf("failed to get backing file size"); 131 } else if (size == 0) { 132 fatal_errmsg = g_strdup_printf("PC system firmware (pflash) " 133 "cannot have zero size"); 134 } else if ((size % sector_size) != 0) { 135 fatal_errmsg = g_strdup_printf("PC system firmware (pflash) " 136 "must be a multiple of 0x%x", sector_size); 137 } else if (phys_addr < size || phys_addr - size < FLASH_MAP_BASE_MIN) { 138 fatal_errmsg = g_strdup_printf("oversized backing file, pflash " 139 "segments cannot be mapped under " 140 TARGET_FMT_plx, FLASH_MAP_BASE_MIN); 141 } 142 if (fatal_errmsg != NULL) { 143 Location loc; 144 145 /* push a new, "none" location on the location stack; overwrite its 146 * contents with the location saved in the option; print the error 147 * (includes location); pop the top 148 */ 149 loc_push_none(&loc); 150 if (pflash_drv->opts != NULL) { 151 qemu_opts_loc_restore(pflash_drv->opts); 152 } 153 error_report("%s", fatal_errmsg); 154 loc_pop(&loc); 155 g_free(fatal_errmsg); 156 exit(1); 157 } 158 159 phys_addr -= size; 160 161 /* pflash_cfi01_register() creates a deep copy of the name */ 162 snprintf(name, sizeof name, "system.flash%d", unit); 163 system_flash = pflash_cfi01_register(phys_addr, NULL /* qdev */, name, 164 size, blk, sector_size, 165 size >> sector_bits, 166 1 /* width */, 167 0x0000 /* id0 */, 168 0x0000 /* id1 */, 169 0x0000 /* id2 */, 170 0x0000 /* id3 */, 171 0 /* be */); 172 if (unit == 0) { 173 flash_mem = pflash_cfi01_get_memory(system_flash); 174 pc_isa_bios_init(rom_memory, flash_mem, size); 175 176 /* Encrypt the pflash boot ROM */ 177 if (kvm_memcrypt_enabled()) { 178 flash_ptr = memory_region_get_ram_ptr(flash_mem); 179 flash_size = memory_region_size(flash_mem); 180 ret = kvm_memcrypt_encrypt_data(flash_ptr, flash_size); 181 if (ret) { 182 error_report("failed to encrypt pflash rom"); 183 exit(1); 184 } 185 } 186 } 187 } 188 } 189 190 static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw) 191 { 192 char *filename; 193 MemoryRegion *bios, *isa_bios; 194 int bios_size, isa_bios_size; 195 int ret; 196 197 /* BIOS load */ 198 if (bios_name == NULL) { 199 bios_name = BIOS_FILENAME; 200 } 201 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 202 if (filename) { 203 bios_size = get_image_size(filename); 204 } else { 205 bios_size = -1; 206 } 207 if (bios_size <= 0 || 208 (bios_size % 65536) != 0) { 209 goto bios_error; 210 } 211 bios = g_malloc(sizeof(*bios)); 212 memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal); 213 if (!isapc_ram_fw) { 214 memory_region_set_readonly(bios, true); 215 } 216 ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1); 217 if (ret != 0) { 218 bios_error: 219 fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name); 220 exit(1); 221 } 222 g_free(filename); 223 224 /* map the last 128KB of the BIOS in ISA space */ 225 isa_bios_size = MIN(bios_size, 128 * KiB); 226 isa_bios = g_malloc(sizeof(*isa_bios)); 227 memory_region_init_alias(isa_bios, NULL, "isa-bios", bios, 228 bios_size - isa_bios_size, isa_bios_size); 229 memory_region_add_subregion_overlap(rom_memory, 230 0x100000 - isa_bios_size, 231 isa_bios, 232 1); 233 if (!isapc_ram_fw) { 234 memory_region_set_readonly(isa_bios, true); 235 } 236 237 /* map all the bios at the top of memory */ 238 memory_region_add_subregion(rom_memory, 239 (uint32_t)(-bios_size), 240 bios); 241 } 242 243 void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw) 244 { 245 DriveInfo *pflash_drv; 246 247 pflash_drv = drive_get(IF_PFLASH, 0, 0); 248 249 if (isapc_ram_fw || pflash_drv == NULL) { 250 /* When a pflash drive is not found, use rom-mode */ 251 old_pc_system_rom_init(rom_memory, isapc_ram_fw); 252 return; 253 } 254 255 if (kvm_enabled() && !kvm_readonly_mem_enabled()) { 256 /* Older KVM cannot execute from device memory. So, flash memory 257 * cannot be used unless the readonly memory kvm capability is present. */ 258 fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n"); 259 exit(1); 260 } 261 262 pc_system_flash_init(rom_memory); 263 } 264