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 "hw/sysbus.h" 32 #include "hw/hw.h" 33 #include "hw/i386/pc.h" 34 #include "hw/boards.h" 35 #include "hw/loader.h" 36 #include "sysemu/sysemu.h" 37 #include "hw/block/flash.h" 38 #include "sysemu/kvm.h" 39 40 #define BIOS_FILENAME "bios.bin" 41 42 typedef struct PcSysFwDevice { 43 SysBusDevice busdev; 44 uint8_t isapc_ram_fw; 45 } PcSysFwDevice; 46 47 static void pc_isa_bios_init(MemoryRegion *rom_memory, 48 MemoryRegion *flash_mem, 49 int ram_size) 50 { 51 int isa_bios_size; 52 MemoryRegion *isa_bios; 53 uint64_t flash_size; 54 void *flash_ptr, *isa_bios_ptr; 55 56 flash_size = memory_region_size(flash_mem); 57 58 /* map the last 128KB of the BIOS in ISA space */ 59 isa_bios_size = MIN(flash_size, 128 * 1024); 60 isa_bios = g_malloc(sizeof(*isa_bios)); 61 memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, 62 &error_fatal); 63 memory_region_add_subregion_overlap(rom_memory, 64 0x100000 - isa_bios_size, 65 isa_bios, 66 1); 67 68 /* copy ISA rom image from top of flash memory */ 69 flash_ptr = memory_region_get_ram_ptr(flash_mem); 70 isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); 71 memcpy(isa_bios_ptr, 72 ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), 73 isa_bios_size); 74 75 memory_region_set_readonly(isa_bios, true); 76 } 77 78 #define FLASH_MAP_UNIT_MAX 2 79 80 /* We don't have a theoretically justifiable exact lower bound on the base 81 * address of any flash mapping. In practice, the IO-APIC MMIO range is 82 * [0xFEE00000..0xFEE01000[ -- see IO_APIC_DEFAULT_ADDRESS --, leaving free 83 * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in 84 * size. 85 */ 86 #define FLASH_MAP_BASE_MIN ((hwaddr)(0x100000000ULL - 8*1024*1024)) 87 88 /* This function maps flash drives from 4G downward, in order of their unit 89 * numbers. The mapping starts at unit#0, with unit number increments of 1, and 90 * stops before the first missing flash drive, or before 91 * unit#FLASH_MAP_UNIT_MAX, whichever is reached first. 92 * 93 * Addressing within one flash drive is of course not reversed. 94 * 95 * An error message is printed and the process exits if: 96 * - the size of the backing file for a flash drive is non-positive, or not a 97 * multiple of the required sector size, or 98 * - the current mapping's base address would fall below FLASH_MAP_BASE_MIN. 99 * 100 * The drive with unit#0 (if available) is mapped at the highest address, and 101 * it is passed to pc_isa_bios_init(). Merging several drives for isa-bios is 102 * not supported. 103 */ 104 static void pc_system_flash_init(MemoryRegion *rom_memory) 105 { 106 int unit; 107 DriveInfo *pflash_drv; 108 BlockBackend *blk; 109 int64_t size; 110 char *fatal_errmsg = NULL; 111 hwaddr phys_addr = 0x100000000ULL; 112 int sector_bits, sector_size; 113 pflash_t *system_flash; 114 MemoryRegion *flash_mem; 115 char name[64]; 116 void *flash_ptr; 117 int ret, flash_size; 118 119 sector_bits = 12; 120 sector_size = 1 << sector_bits; 121 122 for (unit = 0; 123 (unit < FLASH_MAP_UNIT_MAX && 124 (pflash_drv = drive_get(IF_PFLASH, 0, unit)) != NULL); 125 ++unit) { 126 blk = blk_by_legacy_dinfo(pflash_drv); 127 size = blk_getlength(blk); 128 if (size < 0) { 129 fatal_errmsg = g_strdup_printf("failed to get backing file size"); 130 } else if (size == 0) { 131 fatal_errmsg = g_strdup_printf("PC system firmware (pflash) " 132 "cannot have zero size"); 133 } else if ((size % sector_size) != 0) { 134 fatal_errmsg = g_strdup_printf("PC system firmware (pflash) " 135 "must be a multiple of 0x%x", sector_size); 136 } else if (phys_addr < size || phys_addr - size < FLASH_MAP_BASE_MIN) { 137 fatal_errmsg = g_strdup_printf("oversized backing file, pflash " 138 "segments cannot be mapped under " 139 TARGET_FMT_plx, FLASH_MAP_BASE_MIN); 140 } 141 if (fatal_errmsg != NULL) { 142 Location loc; 143 144 /* push a new, "none" location on the location stack; overwrite its 145 * contents with the location saved in the option; print the error 146 * (includes location); pop the top 147 */ 148 loc_push_none(&loc); 149 if (pflash_drv->opts != NULL) { 150 qemu_opts_loc_restore(pflash_drv->opts); 151 } 152 error_report("%s", fatal_errmsg); 153 loc_pop(&loc); 154 g_free(fatal_errmsg); 155 exit(1); 156 } 157 158 phys_addr -= size; 159 160 /* pflash_cfi01_register() creates a deep copy of the name */ 161 snprintf(name, sizeof name, "system.flash%d", unit); 162 system_flash = pflash_cfi01_register(phys_addr, NULL /* qdev */, name, 163 size, blk, sector_size, 164 size >> sector_bits, 165 1 /* width */, 166 0x0000 /* id0 */, 167 0x0000 /* id1 */, 168 0x0000 /* id2 */, 169 0x0000 /* id3 */, 170 0 /* be */); 171 if (unit == 0) { 172 flash_mem = pflash_cfi01_get_memory(system_flash); 173 pc_isa_bios_init(rom_memory, flash_mem, size); 174 175 /* Encrypt the pflash boot ROM */ 176 if (kvm_memcrypt_enabled()) { 177 flash_ptr = memory_region_get_ram_ptr(flash_mem); 178 flash_size = memory_region_size(flash_mem); 179 ret = kvm_memcrypt_encrypt_data(flash_ptr, flash_size); 180 if (ret) { 181 error_report("failed to encrypt pflash rom"); 182 exit(1); 183 } 184 } 185 } 186 } 187 } 188 189 static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw) 190 { 191 char *filename; 192 MemoryRegion *bios, *isa_bios; 193 int bios_size, isa_bios_size; 194 int ret; 195 196 /* BIOS load */ 197 if (bios_name == NULL) { 198 bios_name = BIOS_FILENAME; 199 } 200 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 201 if (filename) { 202 bios_size = get_image_size(filename); 203 } else { 204 bios_size = -1; 205 } 206 if (bios_size <= 0 || 207 (bios_size % 65536) != 0) { 208 goto bios_error; 209 } 210 bios = g_malloc(sizeof(*bios)); 211 memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal); 212 if (!isapc_ram_fw) { 213 memory_region_set_readonly(bios, true); 214 } 215 ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1); 216 if (ret != 0) { 217 bios_error: 218 fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name); 219 exit(1); 220 } 221 g_free(filename); 222 223 /* map the last 128KB of the BIOS in ISA space */ 224 isa_bios_size = bios_size; 225 if (isa_bios_size > (128 * 1024)) { 226 isa_bios_size = 128 * 1024; 227 } 228 isa_bios = g_malloc(sizeof(*isa_bios)); 229 memory_region_init_alias(isa_bios, NULL, "isa-bios", bios, 230 bios_size - isa_bios_size, isa_bios_size); 231 memory_region_add_subregion_overlap(rom_memory, 232 0x100000 - isa_bios_size, 233 isa_bios, 234 1); 235 if (!isapc_ram_fw) { 236 memory_region_set_readonly(isa_bios, true); 237 } 238 239 /* map all the bios at the top of memory */ 240 memory_region_add_subregion(rom_memory, 241 (uint32_t)(-bios_size), 242 bios); 243 } 244 245 void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw) 246 { 247 DriveInfo *pflash_drv; 248 249 pflash_drv = drive_get(IF_PFLASH, 0, 0); 250 251 if (isapc_ram_fw || pflash_drv == NULL) { 252 /* When a pflash drive is not found, use rom-mode */ 253 old_pc_system_rom_init(rom_memory, isapc_ram_fw); 254 return; 255 } 256 257 if (kvm_enabled() && !kvm_readonly_mem_enabled()) { 258 /* Older KVM cannot execute from device memory. So, flash memory 259 * cannot be used unless the readonly memory kvm capability is present. */ 260 fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n"); 261 exit(1); 262 } 263 264 pc_system_flash_init(rom_memory); 265 } 266