1 /* 2 * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <command.h> 9 #include <errno.h> 10 #include <malloc.h> 11 #include <qfw.h> 12 #include <asm/io.h> 13 #ifdef CONFIG_GENERATE_ACPI_TABLE 14 #include <asm/tables.h> 15 #endif 16 #include <linux/list.h> 17 18 static bool fwcfg_present; 19 static bool fwcfg_dma_present; 20 static struct fw_cfg_arch_ops *fwcfg_arch_ops; 21 22 static LIST_HEAD(fw_list); 23 24 #ifdef CONFIG_GENERATE_ACPI_TABLE 25 /* 26 * This function allocates memory for ACPI tables 27 * 28 * @entry : BIOS linker command entry which tells where to allocate memory 29 * (either high memory or low memory) 30 * @addr : The address that should be used for low memory allcation. If the 31 * memory allocation request is 'ZONE_HIGH' then this parameter will 32 * be ignored. 33 * @return: 0 on success, or negative value on failure 34 */ 35 static int bios_linker_allocate(struct bios_linker_entry *entry, ulong *addr) 36 { 37 uint32_t size, align; 38 struct fw_file *file; 39 unsigned long aligned_addr; 40 41 align = le32_to_cpu(entry->alloc.align); 42 /* align must be power of 2 */ 43 if (align & (align - 1)) { 44 printf("error: wrong alignment %u\n", align); 45 return -EINVAL; 46 } 47 48 file = qemu_fwcfg_find_file(entry->alloc.file); 49 if (!file) { 50 printf("error: can't find file %s\n", entry->alloc.file); 51 return -ENOENT; 52 } 53 54 size = be32_to_cpu(file->cfg.size); 55 56 /* 57 * ZONE_HIGH means we need to allocate from high memory, since 58 * malloc space is already at the end of RAM, so we directly use it. 59 * If allocation zone is ZONE_FSEG, then we use the 'addr' passed 60 * in which is low memory 61 */ 62 if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) { 63 aligned_addr = (unsigned long)memalign(align, size); 64 if (!aligned_addr) { 65 printf("error: allocating resource\n"); 66 return -ENOMEM; 67 } 68 } else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) { 69 aligned_addr = ALIGN(*addr, align); 70 } else { 71 printf("error: invalid allocation zone\n"); 72 return -EINVAL; 73 } 74 75 debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n", 76 file->cfg.name, size, entry->alloc.zone, align, aligned_addr); 77 78 qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select), 79 size, (void *)aligned_addr); 80 file->addr = aligned_addr; 81 82 /* adjust address for low memory allocation */ 83 if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) 84 *addr = (aligned_addr + size); 85 86 return 0; 87 } 88 89 /* 90 * This function patches ACPI tables previously loaded 91 * by bios_linker_allocate() 92 * 93 * @entry : BIOS linker command entry which tells how to patch 94 * ACPI tables 95 * @return: 0 on success, or negative value on failure 96 */ 97 static int bios_linker_add_pointer(struct bios_linker_entry *entry) 98 { 99 struct fw_file *dest, *src; 100 uint32_t offset = le32_to_cpu(entry->pointer.offset); 101 uint64_t pointer = 0; 102 103 dest = qemu_fwcfg_find_file(entry->pointer.dest_file); 104 if (!dest || !dest->addr) 105 return -ENOENT; 106 src = qemu_fwcfg_find_file(entry->pointer.src_file); 107 if (!src || !src->addr) 108 return -ENOENT; 109 110 debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n", 111 dest->addr, src->addr, offset, entry->pointer.size, pointer); 112 113 memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size); 114 pointer = le64_to_cpu(pointer); 115 pointer += (unsigned long)src->addr; 116 pointer = cpu_to_le64(pointer); 117 memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size); 118 119 return 0; 120 } 121 122 /* 123 * This function updates checksum fields of ACPI tables previously loaded 124 * by bios_linker_allocate() 125 * 126 * @entry : BIOS linker command entry which tells where to update ACPI table 127 * checksums 128 * @return: 0 on success, or negative value on failure 129 */ 130 static int bios_linker_add_checksum(struct bios_linker_entry *entry) 131 { 132 struct fw_file *file; 133 uint8_t *data, cksum = 0; 134 uint8_t *cksum_start; 135 136 file = qemu_fwcfg_find_file(entry->cksum.file); 137 if (!file || !file->addr) 138 return -ENOENT; 139 140 data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset)); 141 cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start)); 142 cksum = table_compute_checksum(cksum_start, 143 le32_to_cpu(entry->cksum.length)); 144 *data = cksum; 145 146 return 0; 147 } 148 149 /* This function loads and patches ACPI tables provided by QEMU */ 150 ulong write_acpi_tables(ulong addr) 151 { 152 int i, ret = 0; 153 struct fw_file *file; 154 struct bios_linker_entry *table_loader; 155 struct bios_linker_entry *entry; 156 uint32_t size; 157 158 /* make sure fw_list is loaded */ 159 ret = qemu_fwcfg_read_firmware_list(); 160 if (ret) { 161 printf("error: can't read firmware file list\n"); 162 return addr; 163 } 164 165 file = qemu_fwcfg_find_file("etc/table-loader"); 166 if (!file) { 167 printf("error: can't find etc/table-loader\n"); 168 return addr; 169 } 170 171 size = be32_to_cpu(file->cfg.size); 172 if ((size % sizeof(*entry)) != 0) { 173 printf("error: table-loader maybe corrupted\n"); 174 return addr; 175 } 176 177 table_loader = malloc(size); 178 if (!table_loader) { 179 printf("error: no memory for table-loader\n"); 180 return addr; 181 } 182 183 qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select), 184 size, table_loader); 185 186 for (i = 0; i < (size / sizeof(*entry)); i++) { 187 entry = table_loader + i; 188 switch (le32_to_cpu(entry->command)) { 189 case BIOS_LINKER_LOADER_COMMAND_ALLOCATE: 190 ret = bios_linker_allocate(entry, &addr); 191 if (ret) 192 goto out; 193 break; 194 case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER: 195 ret = bios_linker_add_pointer(entry); 196 if (ret) 197 goto out; 198 break; 199 case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM: 200 ret = bios_linker_add_checksum(entry); 201 if (ret) 202 goto out; 203 break; 204 default: 205 break; 206 } 207 } 208 209 out: 210 if (ret) { 211 struct fw_cfg_file_iter iter; 212 for (file = qemu_fwcfg_file_iter_init(&iter); 213 !qemu_fwcfg_file_iter_end(&iter); 214 file = qemu_fwcfg_file_iter_next(&iter)) { 215 if (file->addr) { 216 free((void *)file->addr); 217 file->addr = 0; 218 } 219 } 220 } 221 222 free(table_loader); 223 return addr; 224 } 225 #endif 226 227 /* Read configuration item using fw_cfg PIO interface */ 228 static void qemu_fwcfg_read_entry_pio(uint16_t entry, 229 uint32_t size, void *address) 230 { 231 debug("qemu_fwcfg_read_entry_pio: entry 0x%x, size %u address %p\n", 232 entry, size, address); 233 234 return fwcfg_arch_ops->arch_read_pio(entry, size, address); 235 } 236 237 /* Read configuration item using fw_cfg DMA interface */ 238 static void qemu_fwcfg_read_entry_dma(uint16_t entry, 239 uint32_t size, void *address) 240 { 241 struct fw_cfg_dma_access dma; 242 243 dma.length = cpu_to_be32(size); 244 dma.address = cpu_to_be64((uintptr_t)address); 245 dma.control = cpu_to_be32(FW_CFG_DMA_READ); 246 247 /* 248 * writting FW_CFG_INVALID will cause read operation to resume at 249 * last offset, otherwise read will start at offset 0 250 */ 251 if (entry != FW_CFG_INVALID) 252 dma.control |= cpu_to_be32(FW_CFG_DMA_SELECT | (entry << 16)); 253 254 barrier(); 255 256 debug("qemu_fwcfg_read_entry_dma: entry 0x%x, size %u address %p, control 0x%x\n", 257 entry, size, address, be32_to_cpu(dma.control)); 258 259 fwcfg_arch_ops->arch_read_dma(&dma); 260 } 261 262 bool qemu_fwcfg_present(void) 263 { 264 return fwcfg_present; 265 } 266 267 bool qemu_fwcfg_dma_present(void) 268 { 269 return fwcfg_dma_present; 270 } 271 272 void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address) 273 { 274 if (fwcfg_dma_present) 275 qemu_fwcfg_read_entry_dma(entry, length, address); 276 else 277 qemu_fwcfg_read_entry_pio(entry, length, address); 278 } 279 280 int qemu_fwcfg_online_cpus(void) 281 { 282 uint16_t nb_cpus; 283 284 if (!fwcfg_present) 285 return -ENODEV; 286 287 qemu_fwcfg_read_entry(FW_CFG_NB_CPUS, 2, &nb_cpus); 288 289 return le16_to_cpu(nb_cpus); 290 } 291 292 int qemu_fwcfg_read_firmware_list(void) 293 { 294 int i; 295 uint32_t count; 296 struct fw_file *file; 297 struct list_head *entry; 298 299 /* don't read it twice */ 300 if (!list_empty(&fw_list)) 301 return 0; 302 303 qemu_fwcfg_read_entry(FW_CFG_FILE_DIR, 4, &count); 304 if (!count) 305 return 0; 306 307 count = be32_to_cpu(count); 308 for (i = 0; i < count; i++) { 309 file = malloc(sizeof(*file)); 310 if (!file) { 311 printf("error: allocating resource\n"); 312 goto err; 313 } 314 qemu_fwcfg_read_entry(FW_CFG_INVALID, 315 sizeof(struct fw_cfg_file), &file->cfg); 316 file->addr = 0; 317 list_add_tail(&file->list, &fw_list); 318 } 319 320 return 0; 321 322 err: 323 list_for_each(entry, &fw_list) { 324 file = list_entry(entry, struct fw_file, list); 325 free(file); 326 } 327 328 return -ENOMEM; 329 } 330 331 struct fw_file *qemu_fwcfg_find_file(const char *name) 332 { 333 struct list_head *entry; 334 struct fw_file *file; 335 336 list_for_each(entry, &fw_list) { 337 file = list_entry(entry, struct fw_file, list); 338 if (!strcmp(file->cfg.name, name)) 339 return file; 340 } 341 342 return NULL; 343 } 344 345 struct fw_file *qemu_fwcfg_file_iter_init(struct fw_cfg_file_iter *iter) 346 { 347 iter->entry = fw_list.next; 348 return list_entry((struct list_head *)iter->entry, 349 struct fw_file, list); 350 } 351 352 struct fw_file *qemu_fwcfg_file_iter_next(struct fw_cfg_file_iter *iter) 353 { 354 iter->entry = ((struct list_head *)iter->entry)->next; 355 return list_entry((struct list_head *)iter->entry, 356 struct fw_file, list); 357 } 358 359 bool qemu_fwcfg_file_iter_end(struct fw_cfg_file_iter *iter) 360 { 361 return iter->entry == &fw_list; 362 } 363 364 void qemu_fwcfg_init(struct fw_cfg_arch_ops *ops) 365 { 366 uint32_t qemu; 367 uint32_t dma_enabled; 368 369 fwcfg_present = false; 370 fwcfg_dma_present = false; 371 fwcfg_arch_ops = NULL; 372 373 if (!ops || !ops->arch_read_pio || !ops->arch_read_dma) 374 return; 375 fwcfg_arch_ops = ops; 376 377 qemu_fwcfg_read_entry_pio(FW_CFG_SIGNATURE, 4, &qemu); 378 if (be32_to_cpu(qemu) == QEMU_FW_CFG_SIGNATURE) 379 fwcfg_present = true; 380 381 if (fwcfg_present) { 382 qemu_fwcfg_read_entry_pio(FW_CFG_ID, 1, &dma_enabled); 383 if (dma_enabled & FW_CFG_DMA_ENABLED) 384 fwcfg_dma_present = true; 385 } 386 } 387