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/hw.h" 35 #include "hw/i386/pc.h" 36 #include "hw/boards.h" 37 #include "hw/loader.h" 38 #include "sysemu/sysemu.h" 39 #include "hw/block/flash.h" 40 #include "sysemu/kvm.h" 41 42 #define BIOS_FILENAME "bios.bin" 43 44 /* 45 * We don't have a theoretically justifiable exact lower bound on the base 46 * address of any flash mapping. In practice, the IO-APIC MMIO range is 47 * [0xFEE00000..0xFEE01000] -- see IO_APIC_DEFAULT_ADDRESS --, leaving free 48 * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in 49 * size. 50 */ 51 #define FLASH_SIZE_LIMIT (8 * MiB) 52 53 #define FLASH_SECTOR_SIZE 4096 54 55 static void pc_isa_bios_init(MemoryRegion *rom_memory, 56 MemoryRegion *flash_mem, 57 int ram_size) 58 { 59 int isa_bios_size; 60 MemoryRegion *isa_bios; 61 uint64_t flash_size; 62 void *flash_ptr, *isa_bios_ptr; 63 64 flash_size = memory_region_size(flash_mem); 65 66 /* map the last 128KB of the BIOS in ISA space */ 67 isa_bios_size = MIN(flash_size, 128 * KiB); 68 isa_bios = g_malloc(sizeof(*isa_bios)); 69 memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, 70 &error_fatal); 71 memory_region_add_subregion_overlap(rom_memory, 72 0x100000 - isa_bios_size, 73 isa_bios, 74 1); 75 76 /* copy ISA rom image from top of flash memory */ 77 flash_ptr = memory_region_get_ram_ptr(flash_mem); 78 isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); 79 memcpy(isa_bios_ptr, 80 ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), 81 isa_bios_size); 82 83 memory_region_set_readonly(isa_bios, true); 84 } 85 86 static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms, 87 const char *name, 88 const char *alias_prop_name) 89 { 90 DeviceState *dev = qdev_create(NULL, TYPE_PFLASH_CFI01); 91 92 qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE); 93 qdev_prop_set_uint8(dev, "width", 1); 94 qdev_prop_set_string(dev, "name", name); 95 object_property_add_child(OBJECT(pcms), name, OBJECT(dev), 96 &error_abort); 97 object_property_add_alias(OBJECT(pcms), alias_prop_name, 98 OBJECT(dev), "drive", &error_abort); 99 return PFLASH_CFI01(dev); 100 } 101 102 void pc_system_flash_create(PCMachineState *pcms) 103 { 104 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 105 106 if (pcmc->pci_enabled) { 107 pcms->flash[0] = pc_pflash_create(pcms, "system.flash0", 108 "pflash0"); 109 pcms->flash[1] = pc_pflash_create(pcms, "system.flash1", 110 "pflash1"); 111 } 112 } 113 114 static void pc_system_flash_cleanup_unused(PCMachineState *pcms) 115 { 116 char *prop_name; 117 int i; 118 Object *dev_obj; 119 120 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 121 122 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 123 dev_obj = OBJECT(pcms->flash[i]); 124 if (!object_property_get_bool(dev_obj, "realized", &error_abort)) { 125 prop_name = g_strdup_printf("pflash%d", i); 126 object_property_del(OBJECT(pcms), prop_name, &error_abort); 127 g_free(prop_name); 128 object_unparent(dev_obj); 129 pcms->flash[i] = NULL; 130 } 131 } 132 } 133 134 /* 135 * Map the pcms->flash[] from 4GiB downward, and realize. 136 * Map them in descending order, i.e. pcms->flash[0] at the top, 137 * without gaps. 138 * Stop at the first pcms->flash[0] lacking a block backend. 139 * Set each flash's size from its block backend. Fatal error if the 140 * size isn't a non-zero multiple of 4KiB, or the total size exceeds 141 * FLASH_SIZE_LIMIT. 142 * 143 * If pcms->flash[0] has a block backend, its memory is passed to 144 * pc_isa_bios_init(). Merging several flash devices for isa-bios is 145 * not supported. 146 */ 147 static void pc_system_flash_map(PCMachineState *pcms, 148 MemoryRegion *rom_memory) 149 { 150 hwaddr total_size = 0; 151 int i; 152 BlockBackend *blk; 153 int64_t size; 154 PFlashCFI01 *system_flash; 155 MemoryRegion *flash_mem; 156 void *flash_ptr; 157 int ret, flash_size; 158 159 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 160 161 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 162 system_flash = pcms->flash[i]; 163 blk = pflash_cfi01_get_blk(system_flash); 164 if (!blk) { 165 break; 166 } 167 size = blk_getlength(blk); 168 if (size < 0) { 169 error_report("can't get size of block device %s: %s", 170 blk_name(blk), strerror(-size)); 171 exit(1); 172 } 173 if (size == 0 || size % FLASH_SECTOR_SIZE != 0) { 174 error_report("system firmware block device %s has invalid size " 175 "%" PRId64, 176 blk_name(blk), size); 177 info_report("its size must be a non-zero multiple of 0x%x", 178 FLASH_SECTOR_SIZE); 179 exit(1); 180 } 181 if ((hwaddr)size != size 182 || total_size > HWADDR_MAX - size 183 || total_size + size > FLASH_SIZE_LIMIT) { 184 error_report("combined size of system firmware exceeds " 185 "%" PRIu64 " bytes", 186 FLASH_SIZE_LIMIT); 187 exit(1); 188 } 189 190 total_size += size; 191 qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks", 192 size / FLASH_SECTOR_SIZE); 193 qdev_init_nofail(DEVICE(system_flash)); 194 sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0, 195 0x100000000ULL - total_size); 196 197 if (i == 0) { 198 flash_mem = pflash_cfi01_get_memory(system_flash); 199 pc_isa_bios_init(rom_memory, flash_mem, size); 200 201 /* Encrypt the pflash boot ROM */ 202 if (kvm_memcrypt_enabled()) { 203 flash_ptr = memory_region_get_ram_ptr(flash_mem); 204 flash_size = memory_region_size(flash_mem); 205 ret = kvm_memcrypt_encrypt_data(flash_ptr, flash_size); 206 if (ret) { 207 error_report("failed to encrypt pflash rom"); 208 exit(1); 209 } 210 } 211 } 212 } 213 } 214 215 static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw) 216 { 217 char *filename; 218 MemoryRegion *bios, *isa_bios; 219 int bios_size, isa_bios_size; 220 int ret; 221 222 /* BIOS load */ 223 if (bios_name == NULL) { 224 bios_name = BIOS_FILENAME; 225 } 226 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 227 if (filename) { 228 bios_size = get_image_size(filename); 229 } else { 230 bios_size = -1; 231 } 232 if (bios_size <= 0 || 233 (bios_size % 65536) != 0) { 234 goto bios_error; 235 } 236 bios = g_malloc(sizeof(*bios)); 237 memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal); 238 if (!isapc_ram_fw) { 239 memory_region_set_readonly(bios, true); 240 } 241 ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1); 242 if (ret != 0) { 243 bios_error: 244 fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name); 245 exit(1); 246 } 247 g_free(filename); 248 249 /* map the last 128KB of the BIOS in ISA space */ 250 isa_bios_size = MIN(bios_size, 128 * KiB); 251 isa_bios = g_malloc(sizeof(*isa_bios)); 252 memory_region_init_alias(isa_bios, NULL, "isa-bios", bios, 253 bios_size - isa_bios_size, isa_bios_size); 254 memory_region_add_subregion_overlap(rom_memory, 255 0x100000 - isa_bios_size, 256 isa_bios, 257 1); 258 if (!isapc_ram_fw) { 259 memory_region_set_readonly(isa_bios, true); 260 } 261 262 /* map all the bios at the top of memory */ 263 memory_region_add_subregion(rom_memory, 264 (uint32_t)(-bios_size), 265 bios); 266 } 267 268 void pc_system_firmware_init(PCMachineState *pcms, 269 MemoryRegion *rom_memory) 270 { 271 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 272 int i; 273 BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)]; 274 275 if (!pcmc->pci_enabled) { 276 old_pc_system_rom_init(rom_memory, true); 277 return; 278 } 279 280 /* Map legacy -drive if=pflash to machine properties */ 281 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 282 pflash_cfi01_legacy_drive(pcms->flash[i], 283 drive_get(IF_PFLASH, 0, i)); 284 pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]); 285 } 286 287 /* Reject gaps */ 288 for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) { 289 if (pflash_blk[i] && !pflash_blk[i - 1]) { 290 error_report("pflash%d requires pflash%d", i, i - 1); 291 exit(1); 292 } 293 } 294 295 if (!pflash_blk[0]) { 296 /* Machine property pflash0 not set, use ROM mode */ 297 old_pc_system_rom_init(rom_memory, false); 298 } else { 299 if (kvm_enabled() && !kvm_readonly_mem_enabled()) { 300 /* 301 * Older KVM cannot execute from device memory. So, flash 302 * memory cannot be used unless the readonly memory kvm 303 * capability is present. 304 */ 305 error_report("pflash with kvm requires KVM readonly memory support"); 306 exit(1); 307 } 308 309 pc_system_flash_map(pcms, rom_memory); 310 } 311 312 pc_system_flash_cleanup_unused(pcms); 313 } 314