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/i386/x86.h" 35 #include "hw/i386/pc.h" 36 #include "hw/loader.h" 37 #include "hw/qdev-properties.h" 38 #include "sysemu/sysemu.h" 39 #include "hw/block/flash.h" 40 #include "sysemu/kvm.h" 41 42 /* 43 * We don't have a theoretically justifiable exact lower bound on the base 44 * address of any flash mapping. In practice, the IO-APIC MMIO range is 45 * [0xFEE00000..0xFEE01000] -- see IO_APIC_DEFAULT_ADDRESS --, leaving free 46 * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in 47 * size. 48 */ 49 #define FLASH_SIZE_LIMIT (8 * MiB) 50 51 #define FLASH_SECTOR_SIZE 4096 52 53 static void pc_isa_bios_init(MemoryRegion *rom_memory, 54 MemoryRegion *flash_mem, 55 int ram_size) 56 { 57 int isa_bios_size; 58 MemoryRegion *isa_bios; 59 uint64_t flash_size; 60 void *flash_ptr, *isa_bios_ptr; 61 62 flash_size = memory_region_size(flash_mem); 63 64 /* map the last 128KB of the BIOS in ISA space */ 65 isa_bios_size = MIN(flash_size, 128 * KiB); 66 isa_bios = g_malloc(sizeof(*isa_bios)); 67 memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, 68 &error_fatal); 69 memory_region_add_subregion_overlap(rom_memory, 70 0x100000 - isa_bios_size, 71 isa_bios, 72 1); 73 74 /* copy ISA rom image from top of flash memory */ 75 flash_ptr = memory_region_get_ram_ptr(flash_mem); 76 isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); 77 memcpy(isa_bios_ptr, 78 ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), 79 isa_bios_size); 80 81 memory_region_set_readonly(isa_bios, true); 82 } 83 84 static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms, 85 const char *name, 86 const char *alias_prop_name) 87 { 88 DeviceState *dev = qdev_new(TYPE_PFLASH_CFI01); 89 90 qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE); 91 qdev_prop_set_uint8(dev, "width", 1); 92 qdev_prop_set_string(dev, "name", name); 93 object_property_add_child(OBJECT(pcms), name, OBJECT(dev)); 94 object_property_add_alias(OBJECT(pcms), alias_prop_name, 95 OBJECT(dev), "drive"); 96 return PFLASH_CFI01(dev); 97 } 98 99 void pc_system_flash_create(PCMachineState *pcms) 100 { 101 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 102 103 if (pcmc->pci_enabled) { 104 pcms->flash[0] = pc_pflash_create(pcms, "system.flash0", 105 "pflash0"); 106 pcms->flash[1] = pc_pflash_create(pcms, "system.flash1", 107 "pflash1"); 108 } 109 } 110 111 static void pc_system_flash_cleanup_unused(PCMachineState *pcms) 112 { 113 char *prop_name; 114 int i; 115 Object *dev_obj; 116 117 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 118 119 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 120 dev_obj = OBJECT(pcms->flash[i]); 121 if (!object_property_get_bool(dev_obj, "realized", &error_abort)) { 122 prop_name = g_strdup_printf("pflash%d", i); 123 object_property_del(OBJECT(pcms), prop_name); 124 g_free(prop_name); 125 object_unparent(dev_obj); 126 pcms->flash[i] = NULL; 127 } 128 } 129 } 130 131 /* 132 * Map the pcms->flash[] from 4GiB downward, and realize. 133 * Map them in descending order, i.e. pcms->flash[0] at the top, 134 * without gaps. 135 * Stop at the first pcms->flash[0] lacking a block backend. 136 * Set each flash's size from its block backend. Fatal error if the 137 * size isn't a non-zero multiple of 4KiB, or the total size exceeds 138 * FLASH_SIZE_LIMIT. 139 * 140 * If pcms->flash[0] has a block backend, its memory is passed to 141 * pc_isa_bios_init(). Merging several flash devices for isa-bios is 142 * not supported. 143 */ 144 static void pc_system_flash_map(PCMachineState *pcms, 145 MemoryRegion *rom_memory) 146 { 147 hwaddr total_size = 0; 148 int i; 149 BlockBackend *blk; 150 int64_t size; 151 PFlashCFI01 *system_flash; 152 MemoryRegion *flash_mem; 153 void *flash_ptr; 154 int ret, flash_size; 155 156 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 157 158 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 159 system_flash = pcms->flash[i]; 160 blk = pflash_cfi01_get_blk(system_flash); 161 if (!blk) { 162 break; 163 } 164 size = blk_getlength(blk); 165 if (size < 0) { 166 error_report("can't get size of block device %s: %s", 167 blk_name(blk), strerror(-size)); 168 exit(1); 169 } 170 if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) { 171 error_report("system firmware block device %s has invalid size " 172 "%" PRId64, 173 blk_name(blk), size); 174 info_report("its size must be a non-zero multiple of 0x%x", 175 FLASH_SECTOR_SIZE); 176 exit(1); 177 } 178 if ((hwaddr)size != size 179 || total_size > HWADDR_MAX - size 180 || total_size + size > FLASH_SIZE_LIMIT) { 181 error_report("combined size of system firmware exceeds " 182 "%" PRIu64 " bytes", 183 FLASH_SIZE_LIMIT); 184 exit(1); 185 } 186 187 total_size += size; 188 qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks", 189 size / FLASH_SECTOR_SIZE); 190 sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal); 191 sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0, 192 0x100000000ULL - total_size); 193 194 if (i == 0) { 195 flash_mem = pflash_cfi01_get_memory(system_flash); 196 pc_isa_bios_init(rom_memory, flash_mem, size); 197 198 /* Encrypt the pflash boot ROM */ 199 if (kvm_memcrypt_enabled()) { 200 flash_ptr = memory_region_get_ram_ptr(flash_mem); 201 flash_size = memory_region_size(flash_mem); 202 ret = kvm_memcrypt_encrypt_data(flash_ptr, flash_size); 203 if (ret) { 204 error_report("failed to encrypt pflash rom"); 205 exit(1); 206 } 207 } 208 } 209 } 210 } 211 212 void pc_system_firmware_init(PCMachineState *pcms, 213 MemoryRegion *rom_memory) 214 { 215 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 216 int i; 217 BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)]; 218 219 if (!pcmc->pci_enabled) { 220 x86_bios_rom_init(rom_memory, true); 221 return; 222 } 223 224 /* Map legacy -drive if=pflash to machine properties */ 225 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 226 pflash_cfi01_legacy_drive(pcms->flash[i], 227 drive_get(IF_PFLASH, 0, i)); 228 pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]); 229 } 230 231 /* Reject gaps */ 232 for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) { 233 if (pflash_blk[i] && !pflash_blk[i - 1]) { 234 error_report("pflash%d requires pflash%d", i, i - 1); 235 exit(1); 236 } 237 } 238 239 if (!pflash_blk[0]) { 240 /* Machine property pflash0 not set, use ROM mode */ 241 x86_bios_rom_init(rom_memory, false); 242 } else { 243 if (kvm_enabled() && !kvm_readonly_mem_enabled()) { 244 /* 245 * Older KVM cannot execute from device memory. So, flash 246 * memory cannot be used unless the readonly memory kvm 247 * capability is present. 248 */ 249 error_report("pflash with kvm requires KVM readonly memory support"); 250 exit(1); 251 } 252 253 pc_system_flash_map(pcms, rom_memory); 254 } 255 256 pc_system_flash_cleanup_unused(pcms); 257 } 258