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 /* 44 * We don't have a theoretically justifiable exact lower bound on the base 45 * address of any flash mapping. In practice, the IO-APIC MMIO range is 46 * [0xFEE00000..0xFEE01000] -- see IO_APIC_DEFAULT_ADDRESS --, leaving free 47 * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in 48 * size. 49 */ 50 #define FLASH_SIZE_LIMIT (8 * MiB) 51 52 #define FLASH_SECTOR_SIZE 4096 53 54 static void pc_isa_bios_init(MemoryRegion *rom_memory, 55 MemoryRegion *flash_mem, 56 int ram_size) 57 { 58 int isa_bios_size; 59 MemoryRegion *isa_bios; 60 uint64_t flash_size; 61 void *flash_ptr, *isa_bios_ptr; 62 63 flash_size = memory_region_size(flash_mem); 64 65 /* map the last 128KB of the BIOS in ISA space */ 66 isa_bios_size = MIN(flash_size, 128 * KiB); 67 isa_bios = g_malloc(sizeof(*isa_bios)); 68 memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, 69 &error_fatal); 70 memory_region_add_subregion_overlap(rom_memory, 71 0x100000 - isa_bios_size, 72 isa_bios, 73 1); 74 75 /* copy ISA rom image from top of flash memory */ 76 flash_ptr = memory_region_get_ram_ptr(flash_mem); 77 isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); 78 memcpy(isa_bios_ptr, 79 ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), 80 isa_bios_size); 81 82 memory_region_set_readonly(isa_bios, true); 83 } 84 85 static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms, 86 const char *name, 87 const char *alias_prop_name) 88 { 89 DeviceState *dev = qdev_create(NULL, TYPE_PFLASH_CFI01); 90 91 qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE); 92 qdev_prop_set_uint8(dev, "width", 1); 93 qdev_prop_set_string(dev, "name", name); 94 object_property_add_child(OBJECT(pcms), name, OBJECT(dev), 95 &error_abort); 96 object_property_add_alias(OBJECT(pcms), alias_prop_name, 97 OBJECT(dev), "drive", &error_abort); 98 return PFLASH_CFI01(dev); 99 } 100 101 void pc_system_flash_create(PCMachineState *pcms) 102 { 103 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 104 105 if (pcmc->pci_enabled) { 106 pcms->flash[0] = pc_pflash_create(pcms, "system.flash0", 107 "pflash0"); 108 pcms->flash[1] = pc_pflash_create(pcms, "system.flash1", 109 "pflash1"); 110 } 111 } 112 113 static void pc_system_flash_cleanup_unused(PCMachineState *pcms) 114 { 115 char *prop_name; 116 int i; 117 Object *dev_obj; 118 119 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 120 121 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 122 dev_obj = OBJECT(pcms->flash[i]); 123 if (!object_property_get_bool(dev_obj, "realized", &error_abort)) { 124 prop_name = g_strdup_printf("pflash%d", i); 125 object_property_del(OBJECT(pcms), prop_name, &error_abort); 126 g_free(prop_name); 127 object_unparent(dev_obj); 128 pcms->flash[i] = NULL; 129 } 130 } 131 } 132 133 /* 134 * Map the pcms->flash[] from 4GiB downward, and realize. 135 * Map them in descending order, i.e. pcms->flash[0] at the top, 136 * without gaps. 137 * Stop at the first pcms->flash[0] lacking a block backend. 138 * Set each flash's size from its block backend. Fatal error if the 139 * size isn't a non-zero multiple of 4KiB, or the total size exceeds 140 * FLASH_SIZE_LIMIT. 141 * 142 * If pcms->flash[0] has a block backend, its memory is passed to 143 * pc_isa_bios_init(). Merging several flash devices for isa-bios is 144 * not supported. 145 */ 146 static void pc_system_flash_map(PCMachineState *pcms, 147 MemoryRegion *rom_memory) 148 { 149 hwaddr total_size = 0; 150 int i; 151 BlockBackend *blk; 152 int64_t size; 153 PFlashCFI01 *system_flash; 154 MemoryRegion *flash_mem; 155 void *flash_ptr; 156 int ret, flash_size; 157 158 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 159 160 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 161 system_flash = pcms->flash[i]; 162 blk = pflash_cfi01_get_blk(system_flash); 163 if (!blk) { 164 break; 165 } 166 size = blk_getlength(blk); 167 if (size < 0) { 168 error_report("can't get size of block device %s: %s", 169 blk_name(blk), strerror(-size)); 170 exit(1); 171 } 172 if (size == 0 || size % FLASH_SECTOR_SIZE != 0) { 173 error_report("system firmware block device %s has invalid size " 174 "%" PRId64, 175 blk_name(blk), size); 176 info_report("its size must be a non-zero multiple of 0x%x", 177 FLASH_SECTOR_SIZE); 178 exit(1); 179 } 180 if ((hwaddr)size != size 181 || total_size > HWADDR_MAX - size 182 || total_size + size > FLASH_SIZE_LIMIT) { 183 error_report("combined size of system firmware exceeds " 184 "%" PRIu64 " bytes", 185 FLASH_SIZE_LIMIT); 186 exit(1); 187 } 188 189 total_size += size; 190 qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks", 191 size / FLASH_SECTOR_SIZE); 192 qdev_init_nofail(DEVICE(system_flash)); 193 sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0, 194 0x100000000ULL - total_size); 195 196 if (i == 0) { 197 flash_mem = pflash_cfi01_get_memory(system_flash); 198 pc_isa_bios_init(rom_memory, flash_mem, size); 199 200 /* Encrypt the pflash boot ROM */ 201 if (kvm_memcrypt_enabled()) { 202 flash_ptr = memory_region_get_ram_ptr(flash_mem); 203 flash_size = memory_region_size(flash_mem); 204 ret = kvm_memcrypt_encrypt_data(flash_ptr, flash_size); 205 if (ret) { 206 error_report("failed to encrypt pflash rom"); 207 exit(1); 208 } 209 } 210 } 211 } 212 } 213 214 static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw) 215 { 216 char *filename; 217 MemoryRegion *bios, *isa_bios; 218 int bios_size, isa_bios_size; 219 int ret; 220 221 /* BIOS load */ 222 if (bios_name == NULL) { 223 bios_name = BIOS_FILENAME; 224 } 225 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 226 if (filename) { 227 bios_size = get_image_size(filename); 228 } else { 229 bios_size = -1; 230 } 231 if (bios_size <= 0 || 232 (bios_size % 65536) != 0) { 233 goto bios_error; 234 } 235 bios = g_malloc(sizeof(*bios)); 236 memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal); 237 if (!isapc_ram_fw) { 238 memory_region_set_readonly(bios, true); 239 } 240 ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1); 241 if (ret != 0) { 242 bios_error: 243 fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name); 244 exit(1); 245 } 246 g_free(filename); 247 248 /* map the last 128KB of the BIOS in ISA space */ 249 isa_bios_size = MIN(bios_size, 128 * KiB); 250 isa_bios = g_malloc(sizeof(*isa_bios)); 251 memory_region_init_alias(isa_bios, NULL, "isa-bios", bios, 252 bios_size - isa_bios_size, isa_bios_size); 253 memory_region_add_subregion_overlap(rom_memory, 254 0x100000 - isa_bios_size, 255 isa_bios, 256 1); 257 if (!isapc_ram_fw) { 258 memory_region_set_readonly(isa_bios, true); 259 } 260 261 /* map all the bios at the top of memory */ 262 memory_region_add_subregion(rom_memory, 263 (uint32_t)(-bios_size), 264 bios); 265 } 266 267 void pc_system_firmware_init(PCMachineState *pcms, 268 MemoryRegion *rom_memory) 269 { 270 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 271 int i; 272 DriveInfo *pflash_drv; 273 BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)]; 274 Location loc; 275 276 if (!pcmc->pci_enabled) { 277 old_pc_system_rom_init(rom_memory, true); 278 return; 279 } 280 281 /* Map legacy -drive if=pflash to machine properties */ 282 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 283 pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]); 284 pflash_drv = drive_get(IF_PFLASH, 0, i); 285 if (!pflash_drv) { 286 continue; 287 } 288 loc_push_none(&loc); 289 qemu_opts_loc_restore(pflash_drv->opts); 290 if (pflash_blk[i]) { 291 error_report("clashes with -machine"); 292 exit(1); 293 } 294 pflash_blk[i] = blk_by_legacy_dinfo(pflash_drv); 295 qdev_prop_set_drive(DEVICE(pcms->flash[i]), 296 "drive", pflash_blk[i], &error_fatal); 297 loc_pop(&loc); 298 } 299 300 /* Reject gaps */ 301 for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) { 302 if (pflash_blk[i] && !pflash_blk[i - 1]) { 303 error_report("pflash%d requires pflash%d", i, i - 1); 304 exit(1); 305 } 306 } 307 308 if (!pflash_blk[0]) { 309 /* Machine property pflash0 not set, use ROM mode */ 310 old_pc_system_rom_init(rom_memory, false); 311 } else { 312 if (kvm_enabled() && !kvm_readonly_mem_enabled()) { 313 /* 314 * Older KVM cannot execute from device memory. So, flash 315 * memory cannot be used unless the readonly memory kvm 316 * capability is present. 317 */ 318 error_report("pflash with kvm requires KVM readonly memory support"); 319 exit(1); 320 } 321 322 pc_system_flash_map(pcms, rom_memory); 323 } 324 325 pc_system_flash_cleanup_unused(pcms); 326 } 327