Miao Yan | fcf5c04 | 2016-05-22 19:37:14 -0700 | [diff] [blame] | 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> |
Miao Yan | 1868659 | 2016-05-22 19:37:17 -0700 | [diff] [blame] | 11 | #include <qfw.h> |
Miao Yan | fcf5c04 | 2016-05-22 19:37:14 -0700 | [diff] [blame] | 12 | #include <asm/io.h> |
Miao Yan | eece493 | 2016-05-22 19:37:20 -0700 | [diff] [blame] | 13 | #ifdef CONFIG_GENERATE_ACPI_TABLE |
| 14 | #include <asm/tables.h> |
| 15 | #endif |
Miao Yan | fcf5c04 | 2016-05-22 19:37:14 -0700 | [diff] [blame] | 16 | #include <linux/list.h> |
| 17 | |
| 18 | static bool fwcfg_present; |
| 19 | static bool fwcfg_dma_present; |
Miao Yan | 2e82e74 | 2016-05-22 19:37:15 -0700 | [diff] [blame] | 20 | static struct fw_cfg_arch_ops *fwcfg_arch_ops; |
Miao Yan | fcf5c04 | 2016-05-22 19:37:14 -0700 | [diff] [blame] | 21 | |
| 22 | static LIST_HEAD(fw_list); |
| 23 | |
Miao Yan | eece493 | 2016-05-22 19:37:20 -0700 | [diff] [blame] | 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 | */ |
Simon Glass | 42fd8c1 | 2017-01-16 07:03:35 -0700 | [diff] [blame] | 35 | static int bios_linker_allocate(struct bios_linker_entry *entry, ulong *addr) |
Miao Yan | eece493 | 2016-05-22 19:37:20 -0700 | [diff] [blame] | 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 */ |
Simon Glass | 42fd8c1 | 2017-01-16 07:03:35 -0700 | [diff] [blame] | 150 | ulong write_acpi_tables(ulong addr) |
Miao Yan | eece493 | 2016-05-22 19:37:20 -0700 | [diff] [blame] | 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 | |
Miao Yan | fcf5c04 | 2016-05-22 19:37:14 -0700 | [diff] [blame] | 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 | { |
Miao Yan | 2e82e74 | 2016-05-22 19:37:15 -0700 | [diff] [blame] | 231 | debug("qemu_fwcfg_read_entry_pio: entry 0x%x, size %u address %p\n", |
| 232 | entry, size, address); |
Miao Yan | fcf5c04 | 2016-05-22 19:37:14 -0700 | [diff] [blame] | 233 | |
Miao Yan | 2e82e74 | 2016-05-22 19:37:15 -0700 | [diff] [blame] | 234 | return fwcfg_arch_ops->arch_read_pio(entry, size, address); |
Miao Yan | fcf5c04 | 2016-05-22 19:37:14 -0700 | [diff] [blame] | 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 | |
Miao Yan | 2e82e74 | 2016-05-22 19:37:15 -0700 | [diff] [blame] | 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)); |
Miao Yan | fcf5c04 | 2016-05-22 19:37:14 -0700 | [diff] [blame] | 258 | |
Miao Yan | 2e82e74 | 2016-05-22 19:37:15 -0700 | [diff] [blame] | 259 | fwcfg_arch_ops->arch_read_dma(&dma); |
Miao Yan | fcf5c04 | 2016-05-22 19:37:14 -0700 | [diff] [blame] | 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 | |
Miao Yan | 2e82e74 | 2016-05-22 19:37:15 -0700 | [diff] [blame] | 364 | void qemu_fwcfg_init(struct fw_cfg_arch_ops *ops) |
Miao Yan | fcf5c04 | 2016-05-22 19:37:14 -0700 | [diff] [blame] | 365 | { |
| 366 | uint32_t qemu; |
| 367 | uint32_t dma_enabled; |
| 368 | |
| 369 | fwcfg_present = false; |
| 370 | fwcfg_dma_present = false; |
Miao Yan | 2e82e74 | 2016-05-22 19:37:15 -0700 | [diff] [blame] | 371 | fwcfg_arch_ops = NULL; |
| 372 | |
| 373 | if (!ops || !ops->arch_read_pio || !ops->arch_read_dma) |
| 374 | return; |
| 375 | fwcfg_arch_ops = ops; |
Miao Yan | fcf5c04 | 2016-05-22 19:37:14 -0700 | [diff] [blame] | 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 | } |