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