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/i386/x86.h" 34 #include "hw/i386/pc.h" 35 #include "hw/loader.h" 36 #include "hw/qdev-properties.h" 37 #include "hw/block/flash.h" 38 #include "sysemu/kvm.h" 39 #include "sev.h" 40 41 #define FLASH_SECTOR_SIZE 4096 42 43 static void pc_isa_bios_init(MemoryRegion *isa_bios, MemoryRegion *rom_memory, 44 MemoryRegion *flash_mem) 45 { 46 int isa_bios_size; 47 uint64_t flash_size; 48 void *flash_ptr, *isa_bios_ptr; 49 50 flash_size = memory_region_size(flash_mem); 51 52 /* map the last 128KB of the BIOS in ISA space */ 53 isa_bios_size = MIN(flash_size, 128 * KiB); 54 memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, 55 &error_fatal); 56 memory_region_add_subregion_overlap(rom_memory, 57 0x100000 - isa_bios_size, 58 isa_bios, 59 1); 60 61 /* copy ISA rom image from top of flash memory */ 62 flash_ptr = memory_region_get_ram_ptr(flash_mem); 63 isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); 64 memcpy(isa_bios_ptr, 65 ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), 66 isa_bios_size); 67 68 memory_region_set_readonly(isa_bios, true); 69 } 70 71 static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms, 72 const char *name, 73 const char *alias_prop_name) 74 { 75 DeviceState *dev = qdev_new(TYPE_PFLASH_CFI01); 76 77 qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE); 78 qdev_prop_set_uint8(dev, "width", 1); 79 qdev_prop_set_string(dev, "name", name); 80 object_property_add_child(OBJECT(pcms), name, OBJECT(dev)); 81 object_property_add_alias(OBJECT(pcms), alias_prop_name, 82 OBJECT(dev), "drive"); 83 /* 84 * The returned reference is tied to the child property and 85 * will be removed with object_unparent. 86 */ 87 object_unref(OBJECT(dev)); 88 return PFLASH_CFI01(dev); 89 } 90 91 void pc_system_flash_create(PCMachineState *pcms) 92 { 93 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 94 95 if (pcmc->pci_enabled) { 96 pcms->flash[0] = pc_pflash_create(pcms, "system.flash0", 97 "pflash0"); 98 pcms->flash[1] = pc_pflash_create(pcms, "system.flash1", 99 "pflash1"); 100 } 101 } 102 103 void pc_system_flash_cleanup_unused(PCMachineState *pcms) 104 { 105 char *prop_name; 106 int i; 107 108 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 109 110 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 111 if (!qdev_is_realized(DEVICE(pcms->flash[i]))) { 112 prop_name = g_strdup_printf("pflash%d", i); 113 object_property_del(OBJECT(pcms), prop_name); 114 g_free(prop_name); 115 object_unparent(OBJECT(pcms->flash[i])); 116 pcms->flash[i] = NULL; 117 } 118 } 119 } 120 121 /* 122 * Map the pcms->flash[] from 4GiB downward, and realize. 123 * Map them in descending order, i.e. pcms->flash[0] at the top, 124 * without gaps. 125 * Stop at the first pcms->flash[0] lacking a block backend. 126 * Set each flash's size from its block backend. Fatal error if the 127 * size isn't a non-zero multiple of 4KiB, or the total size exceeds 128 * pcms->max_fw_size. 129 * 130 * If pcms->flash[0] has a block backend, its memory is passed to 131 * pc_isa_bios_init(). Merging several flash devices for isa-bios is 132 * not supported. 133 */ 134 static void pc_system_flash_map(PCMachineState *pcms, 135 MemoryRegion *rom_memory) 136 { 137 X86MachineState *x86ms = X86_MACHINE(pcms); 138 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 139 hwaddr total_size = 0; 140 int i; 141 BlockBackend *blk; 142 int64_t size; 143 PFlashCFI01 *system_flash; 144 MemoryRegion *flash_mem; 145 void *flash_ptr; 146 int flash_size; 147 148 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 149 150 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 151 system_flash = pcms->flash[i]; 152 blk = pflash_cfi01_get_blk(system_flash); 153 if (!blk) { 154 break; 155 } 156 size = blk_getlength(blk); 157 if (size < 0) { 158 error_report("can't get size of block device %s: %s", 159 blk_name(blk), strerror(-size)); 160 exit(1); 161 } 162 if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) { 163 error_report("system firmware block device %s has invalid size " 164 "%" PRId64, 165 blk_name(blk), size); 166 info_report("its size must be a non-zero multiple of 0x%x", 167 FLASH_SECTOR_SIZE); 168 exit(1); 169 } 170 if ((hwaddr)size != size 171 || total_size > HWADDR_MAX - size 172 || total_size + size > pcms->max_fw_size) { 173 error_report("combined size of system firmware exceeds " 174 "%" PRIu64 " bytes", 175 pcms->max_fw_size); 176 exit(1); 177 } 178 179 total_size += size; 180 qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks", 181 size / FLASH_SECTOR_SIZE); 182 sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal); 183 sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0, 184 0x100000000ULL - total_size); 185 186 if (i == 0) { 187 flash_mem = pflash_cfi01_get_memory(system_flash); 188 if (pcmc->isa_bios_alias) { 189 x86_isa_bios_init(&x86ms->isa_bios, rom_memory, flash_mem, 190 true); 191 } else { 192 pc_isa_bios_init(&x86ms->isa_bios, rom_memory, flash_mem); 193 } 194 195 /* Encrypt the pflash boot ROM */ 196 if (sev_enabled()) { 197 flash_ptr = memory_region_get_ram_ptr(flash_mem); 198 flash_size = memory_region_size(flash_mem); 199 x86_firmware_configure(flash_ptr, flash_size); 200 } 201 } 202 } 203 } 204 205 void pc_system_firmware_init(PCMachineState *pcms, 206 MemoryRegion *rom_memory) 207 { 208 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 209 int i; 210 BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)]; 211 212 if (!pcmc->pci_enabled) { 213 x86_bios_rom_init(X86_MACHINE(pcms), "bios.bin", rom_memory, true); 214 return; 215 } 216 217 /* Map legacy -drive if=pflash to machine properties */ 218 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 219 pflash_cfi01_legacy_drive(pcms->flash[i], 220 drive_get(IF_PFLASH, 0, i)); 221 pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]); 222 } 223 224 /* Reject gaps */ 225 for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) { 226 if (pflash_blk[i] && !pflash_blk[i - 1]) { 227 error_report("pflash%d requires pflash%d", i, i - 1); 228 exit(1); 229 } 230 } 231 232 if (!pflash_blk[0]) { 233 /* Machine property pflash0 not set, use ROM mode */ 234 x86_bios_rom_init(X86_MACHINE(pcms), "bios.bin", rom_memory, false); 235 } else { 236 if (kvm_enabled() && !kvm_readonly_mem_enabled()) { 237 /* 238 * Older KVM cannot execute from device memory. So, flash 239 * memory cannot be used unless the readonly memory kvm 240 * capability is present. 241 */ 242 error_report("pflash with kvm requires KVM readonly memory support"); 243 exit(1); 244 } 245 246 pc_system_flash_map(pcms, rom_memory); 247 } 248 249 pc_system_flash_cleanup_unused(pcms); 250 } 251 252 void x86_firmware_configure(void *ptr, int size) 253 { 254 int ret; 255 256 /* 257 * OVMF places a GUIDed structures in the flash, so 258 * search for them 259 */ 260 pc_system_parse_ovmf_flash(ptr, size); 261 262 if (sev_enabled()) { 263 ret = sev_es_save_reset_vector(ptr, size); 264 if (ret) { 265 error_report("failed to locate and/or save reset vector"); 266 exit(1); 267 } 268 269 sev_encrypt_flash(ptr, size, &error_fatal); 270 } 271 } 272