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 "hw/sysbus.h" 31 #include "hw/hw.h" 32 #include "hw/i386/pc.h" 33 #include "hw/boards.h" 34 #include "hw/loader.h" 35 #include "sysemu/sysemu.h" 36 #include "hw/block/flash.h" 37 #include "sysemu/kvm.h" 38 39 #define BIOS_FILENAME "bios.bin" 40 41 typedef struct PcSysFwDevice { 42 SysBusDevice busdev; 43 uint8_t isapc_ram_fw; 44 } PcSysFwDevice; 45 46 static void pc_isa_bios_init(MemoryRegion *rom_memory, 47 MemoryRegion *flash_mem, 48 int ram_size) 49 { 50 int isa_bios_size; 51 MemoryRegion *isa_bios; 52 uint64_t flash_size; 53 void *flash_ptr, *isa_bios_ptr; 54 55 flash_size = memory_region_size(flash_mem); 56 57 /* map the last 128KB of the BIOS in ISA space */ 58 isa_bios_size = MIN(flash_size, 128 * 1024); 59 isa_bios = g_malloc(sizeof(*isa_bios)); 60 memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, 61 &error_fatal); 62 vmstate_register_ram_global(isa_bios); 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]; 116 117 sector_bits = 12; 118 sector_size = 1 << sector_bits; 119 120 for (unit = 0; 121 (unit < FLASH_MAP_UNIT_MAX && 122 (pflash_drv = drive_get(IF_PFLASH, 0, unit)) != NULL); 123 ++unit) { 124 blk = blk_by_legacy_dinfo(pflash_drv); 125 size = blk_getlength(blk); 126 if (size < 0) { 127 fatal_errmsg = g_strdup_printf("failed to get backing file size"); 128 } else if (size == 0) { 129 fatal_errmsg = g_strdup_printf("PC system firmware (pflash) " 130 "cannot have zero size"); 131 } else if ((size % sector_size) != 0) { 132 fatal_errmsg = g_strdup_printf("PC system firmware (pflash) " 133 "must be a multiple of 0x%x", sector_size); 134 } else if (phys_addr < size || phys_addr - size < FLASH_MAP_BASE_MIN) { 135 fatal_errmsg = g_strdup_printf("oversized backing file, pflash " 136 "segments cannot be mapped under " 137 TARGET_FMT_plx, FLASH_MAP_BASE_MIN); 138 } 139 if (fatal_errmsg != NULL) { 140 Location loc; 141 142 /* push a new, "none" location on the location stack; overwrite its 143 * contents with the location saved in the option; print the error 144 * (includes location); pop the top 145 */ 146 loc_push_none(&loc); 147 if (pflash_drv->opts != NULL) { 148 qemu_opts_loc_restore(pflash_drv->opts); 149 } 150 error_report("%s", fatal_errmsg); 151 loc_pop(&loc); 152 g_free(fatal_errmsg); 153 exit(1); 154 } 155 156 phys_addr -= size; 157 158 /* pflash_cfi01_register() creates a deep copy of the name */ 159 snprintf(name, sizeof name, "system.flash%d", unit); 160 system_flash = pflash_cfi01_register(phys_addr, NULL /* qdev */, name, 161 size, blk, sector_size, 162 size >> sector_bits, 163 1 /* width */, 164 0x0000 /* id0 */, 165 0x0000 /* id1 */, 166 0x0000 /* id2 */, 167 0x0000 /* id3 */, 168 0 /* be */); 169 if (unit == 0) { 170 flash_mem = pflash_cfi01_get_memory(system_flash); 171 pc_isa_bios_init(rom_memory, flash_mem, size); 172 } 173 } 174 } 175 176 static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw) 177 { 178 char *filename; 179 MemoryRegion *bios, *isa_bios; 180 int bios_size, isa_bios_size; 181 int ret; 182 183 /* BIOS load */ 184 if (bios_name == NULL) { 185 bios_name = BIOS_FILENAME; 186 } 187 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 188 if (filename) { 189 bios_size = get_image_size(filename); 190 } else { 191 bios_size = -1; 192 } 193 if (bios_size <= 0 || 194 (bios_size % 65536) != 0) { 195 goto bios_error; 196 } 197 bios = g_malloc(sizeof(*bios)); 198 memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal); 199 vmstate_register_ram_global(bios); 200 if (!isapc_ram_fw) { 201 memory_region_set_readonly(bios, true); 202 } 203 ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1); 204 if (ret != 0) { 205 bios_error: 206 fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name); 207 exit(1); 208 } 209 g_free(filename); 210 211 /* map the last 128KB of the BIOS in ISA space */ 212 isa_bios_size = bios_size; 213 if (isa_bios_size > (128 * 1024)) { 214 isa_bios_size = 128 * 1024; 215 } 216 isa_bios = g_malloc(sizeof(*isa_bios)); 217 memory_region_init_alias(isa_bios, NULL, "isa-bios", bios, 218 bios_size - isa_bios_size, isa_bios_size); 219 memory_region_add_subregion_overlap(rom_memory, 220 0x100000 - isa_bios_size, 221 isa_bios, 222 1); 223 if (!isapc_ram_fw) { 224 memory_region_set_readonly(isa_bios, true); 225 } 226 227 /* map all the bios at the top of memory */ 228 memory_region_add_subregion(rom_memory, 229 (uint32_t)(-bios_size), 230 bios); 231 } 232 233 void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw) 234 { 235 DriveInfo *pflash_drv; 236 237 pflash_drv = drive_get(IF_PFLASH, 0, 0); 238 239 if (isapc_ram_fw || pflash_drv == NULL) { 240 /* When a pflash drive is not found, use rom-mode */ 241 old_pc_system_rom_init(rom_memory, isapc_ram_fw); 242 return; 243 } 244 245 if (kvm_enabled() && !kvm_readonly_mem_enabled()) { 246 /* Older KVM cannot execute from device memory. So, flash memory 247 * cannot be used unless the readonly memory kvm capability is present. */ 248 fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n"); 249 exit(1); 250 } 251 252 pc_system_flash_init(rom_memory); 253 } 254