1f4f75ad5SArd Biesheuvel /* 2f4f75ad5SArd Biesheuvel * Helper functions used by the EFI stub on multiple 3f4f75ad5SArd Biesheuvel * architectures. This should be #included by the EFI stub 4f4f75ad5SArd Biesheuvel * implementation files. 5f4f75ad5SArd Biesheuvel * 6f4f75ad5SArd Biesheuvel * Copyright 2011 Intel Corporation; author Matt Fleming 7f4f75ad5SArd Biesheuvel * 8f4f75ad5SArd Biesheuvel * This file is part of the Linux kernel, and is made available 9f4f75ad5SArd Biesheuvel * under the terms of the GNU General Public License version 2. 10f4f75ad5SArd Biesheuvel * 11f4f75ad5SArd Biesheuvel */ 12f4f75ad5SArd Biesheuvel 13f4f75ad5SArd Biesheuvel #include <linux/efi.h> 14f4f75ad5SArd Biesheuvel #include <asm/efi.h> 15f4f75ad5SArd Biesheuvel 16f4f75ad5SArd Biesheuvel #include "efistub.h" 17f4f75ad5SArd Biesheuvel 185a17dae4SMatt Fleming /* 195a17dae4SMatt Fleming * Some firmware implementations have problems reading files in one go. 205a17dae4SMatt Fleming * A read chunk size of 1MB seems to work for most platforms. 215a17dae4SMatt Fleming * 225a17dae4SMatt Fleming * Unfortunately, reading files in chunks triggers *other* bugs on some 235a17dae4SMatt Fleming * platforms, so we provide a way to disable this workaround, which can 245a17dae4SMatt Fleming * be done by passing "efi=nochunk" on the EFI boot stub command line. 255a17dae4SMatt Fleming * 265a17dae4SMatt Fleming * If you experience issues with initrd images being corrupt it's worth 275a17dae4SMatt Fleming * trying efi=nochunk, but chunking is enabled by default because there 285a17dae4SMatt Fleming * are far more machines that require the workaround than those that 295a17dae4SMatt Fleming * break with it enabled. 305a17dae4SMatt Fleming */ 31f4f75ad5SArd Biesheuvel #define EFI_READ_CHUNK_SIZE (1024 * 1024) 32f4f75ad5SArd Biesheuvel 335a17dae4SMatt Fleming static unsigned long __chunk_size = EFI_READ_CHUNK_SIZE; 345a17dae4SMatt Fleming 35f4f75ad5SArd Biesheuvel struct file_info { 36f4f75ad5SArd Biesheuvel efi_file_handle_t *handle; 37f4f75ad5SArd Biesheuvel u64 size; 38f4f75ad5SArd Biesheuvel }; 39f4f75ad5SArd Biesheuvel 40f4f75ad5SArd Biesheuvel void efi_printk(efi_system_table_t *sys_table_arg, char *str) 41f4f75ad5SArd Biesheuvel { 42f4f75ad5SArd Biesheuvel char *s8; 43f4f75ad5SArd Biesheuvel 44f4f75ad5SArd Biesheuvel for (s8 = str; *s8; s8++) { 45f4f75ad5SArd Biesheuvel efi_char16_t ch[2] = { 0 }; 46f4f75ad5SArd Biesheuvel 47f4f75ad5SArd Biesheuvel ch[0] = *s8; 48f4f75ad5SArd Biesheuvel if (*s8 == '\n') { 49f4f75ad5SArd Biesheuvel efi_char16_t nl[2] = { '\r', 0 }; 50f4f75ad5SArd Biesheuvel efi_char16_printk(sys_table_arg, nl); 51f4f75ad5SArd Biesheuvel } 52f4f75ad5SArd Biesheuvel 53f4f75ad5SArd Biesheuvel efi_char16_printk(sys_table_arg, ch); 54f4f75ad5SArd Biesheuvel } 55f4f75ad5SArd Biesheuvel } 56f4f75ad5SArd Biesheuvel 57f4f75ad5SArd Biesheuvel efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg, 58f4f75ad5SArd Biesheuvel efi_memory_desc_t **map, 59f4f75ad5SArd Biesheuvel unsigned long *map_size, 60f4f75ad5SArd Biesheuvel unsigned long *desc_size, 61f4f75ad5SArd Biesheuvel u32 *desc_ver, 62f4f75ad5SArd Biesheuvel unsigned long *key_ptr) 63f4f75ad5SArd Biesheuvel { 64f4f75ad5SArd Biesheuvel efi_memory_desc_t *m = NULL; 65f4f75ad5SArd Biesheuvel efi_status_t status; 66f4f75ad5SArd Biesheuvel unsigned long key; 67f4f75ad5SArd Biesheuvel u32 desc_version; 68f4f75ad5SArd Biesheuvel 69f4f75ad5SArd Biesheuvel *map_size = sizeof(*m) * 32; 70f4f75ad5SArd Biesheuvel again: 71f4f75ad5SArd Biesheuvel /* 72f4f75ad5SArd Biesheuvel * Add an additional efi_memory_desc_t because we're doing an 73f4f75ad5SArd Biesheuvel * allocation which may be in a new descriptor region. 74f4f75ad5SArd Biesheuvel */ 75f4f75ad5SArd Biesheuvel *map_size += sizeof(*m); 76f4f75ad5SArd Biesheuvel status = efi_call_early(allocate_pool, EFI_LOADER_DATA, 77f4f75ad5SArd Biesheuvel *map_size, (void **)&m); 78f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) 79f4f75ad5SArd Biesheuvel goto fail; 80f4f75ad5SArd Biesheuvel 81f4f75ad5SArd Biesheuvel *desc_size = 0; 82f4f75ad5SArd Biesheuvel key = 0; 83f4f75ad5SArd Biesheuvel status = efi_call_early(get_memory_map, map_size, m, 84f4f75ad5SArd Biesheuvel &key, desc_size, &desc_version); 85f4f75ad5SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) { 86f4f75ad5SArd Biesheuvel efi_call_early(free_pool, m); 87f4f75ad5SArd Biesheuvel goto again; 88f4f75ad5SArd Biesheuvel } 89f4f75ad5SArd Biesheuvel 90f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) 91f4f75ad5SArd Biesheuvel efi_call_early(free_pool, m); 92f4f75ad5SArd Biesheuvel 93f4f75ad5SArd Biesheuvel if (key_ptr && status == EFI_SUCCESS) 94f4f75ad5SArd Biesheuvel *key_ptr = key; 95f4f75ad5SArd Biesheuvel if (desc_ver && status == EFI_SUCCESS) 96f4f75ad5SArd Biesheuvel *desc_ver = desc_version; 97f4f75ad5SArd Biesheuvel 98f4f75ad5SArd Biesheuvel fail: 99f4f75ad5SArd Biesheuvel *map = m; 100f4f75ad5SArd Biesheuvel return status; 101f4f75ad5SArd Biesheuvel } 102f4f75ad5SArd Biesheuvel 103f4f75ad5SArd Biesheuvel 104ddeeefe2SArd Biesheuvel unsigned long get_dram_base(efi_system_table_t *sys_table_arg) 105f4f75ad5SArd Biesheuvel { 106f4f75ad5SArd Biesheuvel efi_status_t status; 107f4f75ad5SArd Biesheuvel unsigned long map_size; 108f4f75ad5SArd Biesheuvel unsigned long membase = EFI_ERROR; 109f4f75ad5SArd Biesheuvel struct efi_memory_map map; 110f4f75ad5SArd Biesheuvel efi_memory_desc_t *md; 111f4f75ad5SArd Biesheuvel 112f4f75ad5SArd Biesheuvel status = efi_get_memory_map(sys_table_arg, (efi_memory_desc_t **)&map.map, 113f4f75ad5SArd Biesheuvel &map_size, &map.desc_size, NULL, NULL); 114f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) 115f4f75ad5SArd Biesheuvel return membase; 116f4f75ad5SArd Biesheuvel 117f4f75ad5SArd Biesheuvel map.map_end = map.map + map_size; 118f4f75ad5SArd Biesheuvel 119f4f75ad5SArd Biesheuvel for_each_efi_memory_desc(&map, md) 120f4f75ad5SArd Biesheuvel if (md->attribute & EFI_MEMORY_WB) 121f4f75ad5SArd Biesheuvel if (membase > md->phys_addr) 122f4f75ad5SArd Biesheuvel membase = md->phys_addr; 123f4f75ad5SArd Biesheuvel 124f4f75ad5SArd Biesheuvel efi_call_early(free_pool, map.map); 125f4f75ad5SArd Biesheuvel 126f4f75ad5SArd Biesheuvel return membase; 127f4f75ad5SArd Biesheuvel } 128f4f75ad5SArd Biesheuvel 129f4f75ad5SArd Biesheuvel /* 130f4f75ad5SArd Biesheuvel * Allocate at the highest possible address that is not above 'max'. 131f4f75ad5SArd Biesheuvel */ 132f4f75ad5SArd Biesheuvel efi_status_t efi_high_alloc(efi_system_table_t *sys_table_arg, 133f4f75ad5SArd Biesheuvel unsigned long size, unsigned long align, 134f4f75ad5SArd Biesheuvel unsigned long *addr, unsigned long max) 135f4f75ad5SArd Biesheuvel { 136f4f75ad5SArd Biesheuvel unsigned long map_size, desc_size; 137f4f75ad5SArd Biesheuvel efi_memory_desc_t *map; 138f4f75ad5SArd Biesheuvel efi_status_t status; 139f4f75ad5SArd Biesheuvel unsigned long nr_pages; 140f4f75ad5SArd Biesheuvel u64 max_addr = 0; 141f4f75ad5SArd Biesheuvel int i; 142f4f75ad5SArd Biesheuvel 143f4f75ad5SArd Biesheuvel status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size, 144f4f75ad5SArd Biesheuvel NULL, NULL); 145f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) 146f4f75ad5SArd Biesheuvel goto fail; 147f4f75ad5SArd Biesheuvel 148f4f75ad5SArd Biesheuvel /* 149f4f75ad5SArd Biesheuvel * Enforce minimum alignment that EFI requires when requesting 150f4f75ad5SArd Biesheuvel * a specific address. We are doing page-based allocations, 151f4f75ad5SArd Biesheuvel * so we must be aligned to a page. 152f4f75ad5SArd Biesheuvel */ 153f4f75ad5SArd Biesheuvel if (align < EFI_PAGE_SIZE) 154f4f75ad5SArd Biesheuvel align = EFI_PAGE_SIZE; 155f4f75ad5SArd Biesheuvel 156f4f75ad5SArd Biesheuvel nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; 157f4f75ad5SArd Biesheuvel again: 158f4f75ad5SArd Biesheuvel for (i = 0; i < map_size / desc_size; i++) { 159f4f75ad5SArd Biesheuvel efi_memory_desc_t *desc; 160f4f75ad5SArd Biesheuvel unsigned long m = (unsigned long)map; 161f4f75ad5SArd Biesheuvel u64 start, end; 162f4f75ad5SArd Biesheuvel 163f4f75ad5SArd Biesheuvel desc = (efi_memory_desc_t *)(m + (i * desc_size)); 164f4f75ad5SArd Biesheuvel if (desc->type != EFI_CONVENTIONAL_MEMORY) 165f4f75ad5SArd Biesheuvel continue; 166f4f75ad5SArd Biesheuvel 167f4f75ad5SArd Biesheuvel if (desc->num_pages < nr_pages) 168f4f75ad5SArd Biesheuvel continue; 169f4f75ad5SArd Biesheuvel 170f4f75ad5SArd Biesheuvel start = desc->phys_addr; 171f4f75ad5SArd Biesheuvel end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT); 172f4f75ad5SArd Biesheuvel 173f4f75ad5SArd Biesheuvel if ((start + size) > end || (start + size) > max) 174f4f75ad5SArd Biesheuvel continue; 175f4f75ad5SArd Biesheuvel 176f4f75ad5SArd Biesheuvel if (end - size > max) 177f4f75ad5SArd Biesheuvel end = max; 178f4f75ad5SArd Biesheuvel 179f4f75ad5SArd Biesheuvel if (round_down(end - size, align) < start) 180f4f75ad5SArd Biesheuvel continue; 181f4f75ad5SArd Biesheuvel 182f4f75ad5SArd Biesheuvel start = round_down(end - size, align); 183f4f75ad5SArd Biesheuvel 184f4f75ad5SArd Biesheuvel /* 185f4f75ad5SArd Biesheuvel * Don't allocate at 0x0. It will confuse code that 186f4f75ad5SArd Biesheuvel * checks pointers against NULL. 187f4f75ad5SArd Biesheuvel */ 188f4f75ad5SArd Biesheuvel if (start == 0x0) 189f4f75ad5SArd Biesheuvel continue; 190f4f75ad5SArd Biesheuvel 191f4f75ad5SArd Biesheuvel if (start > max_addr) 192f4f75ad5SArd Biesheuvel max_addr = start; 193f4f75ad5SArd Biesheuvel } 194f4f75ad5SArd Biesheuvel 195f4f75ad5SArd Biesheuvel if (!max_addr) 196f4f75ad5SArd Biesheuvel status = EFI_NOT_FOUND; 197f4f75ad5SArd Biesheuvel else { 198f4f75ad5SArd Biesheuvel status = efi_call_early(allocate_pages, 199f4f75ad5SArd Biesheuvel EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA, 200f4f75ad5SArd Biesheuvel nr_pages, &max_addr); 201f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) { 202f4f75ad5SArd Biesheuvel max = max_addr; 203f4f75ad5SArd Biesheuvel max_addr = 0; 204f4f75ad5SArd Biesheuvel goto again; 205f4f75ad5SArd Biesheuvel } 206f4f75ad5SArd Biesheuvel 207f4f75ad5SArd Biesheuvel *addr = max_addr; 208f4f75ad5SArd Biesheuvel } 209f4f75ad5SArd Biesheuvel 210f4f75ad5SArd Biesheuvel efi_call_early(free_pool, map); 211f4f75ad5SArd Biesheuvel fail: 212f4f75ad5SArd Biesheuvel return status; 213f4f75ad5SArd Biesheuvel } 214f4f75ad5SArd Biesheuvel 215f4f75ad5SArd Biesheuvel /* 216f4f75ad5SArd Biesheuvel * Allocate at the lowest possible address. 217f4f75ad5SArd Biesheuvel */ 218f4f75ad5SArd Biesheuvel efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg, 219f4f75ad5SArd Biesheuvel unsigned long size, unsigned long align, 220f4f75ad5SArd Biesheuvel unsigned long *addr) 221f4f75ad5SArd Biesheuvel { 222f4f75ad5SArd Biesheuvel unsigned long map_size, desc_size; 223f4f75ad5SArd Biesheuvel efi_memory_desc_t *map; 224f4f75ad5SArd Biesheuvel efi_status_t status; 225f4f75ad5SArd Biesheuvel unsigned long nr_pages; 226f4f75ad5SArd Biesheuvel int i; 227f4f75ad5SArd Biesheuvel 228f4f75ad5SArd Biesheuvel status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size, 229f4f75ad5SArd Biesheuvel NULL, NULL); 230f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) 231f4f75ad5SArd Biesheuvel goto fail; 232f4f75ad5SArd Biesheuvel 233f4f75ad5SArd Biesheuvel /* 234f4f75ad5SArd Biesheuvel * Enforce minimum alignment that EFI requires when requesting 235f4f75ad5SArd Biesheuvel * a specific address. We are doing page-based allocations, 236f4f75ad5SArd Biesheuvel * so we must be aligned to a page. 237f4f75ad5SArd Biesheuvel */ 238f4f75ad5SArd Biesheuvel if (align < EFI_PAGE_SIZE) 239f4f75ad5SArd Biesheuvel align = EFI_PAGE_SIZE; 240f4f75ad5SArd Biesheuvel 241f4f75ad5SArd Biesheuvel nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; 242f4f75ad5SArd Biesheuvel for (i = 0; i < map_size / desc_size; i++) { 243f4f75ad5SArd Biesheuvel efi_memory_desc_t *desc; 244f4f75ad5SArd Biesheuvel unsigned long m = (unsigned long)map; 245f4f75ad5SArd Biesheuvel u64 start, end; 246f4f75ad5SArd Biesheuvel 247f4f75ad5SArd Biesheuvel desc = (efi_memory_desc_t *)(m + (i * desc_size)); 248f4f75ad5SArd Biesheuvel 249f4f75ad5SArd Biesheuvel if (desc->type != EFI_CONVENTIONAL_MEMORY) 250f4f75ad5SArd Biesheuvel continue; 251f4f75ad5SArd Biesheuvel 252f4f75ad5SArd Biesheuvel if (desc->num_pages < nr_pages) 253f4f75ad5SArd Biesheuvel continue; 254f4f75ad5SArd Biesheuvel 255f4f75ad5SArd Biesheuvel start = desc->phys_addr; 256f4f75ad5SArd Biesheuvel end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT); 257f4f75ad5SArd Biesheuvel 258f4f75ad5SArd Biesheuvel /* 259f4f75ad5SArd Biesheuvel * Don't allocate at 0x0. It will confuse code that 260f4f75ad5SArd Biesheuvel * checks pointers against NULL. Skip the first 8 261f4f75ad5SArd Biesheuvel * bytes so we start at a nice even number. 262f4f75ad5SArd Biesheuvel */ 263f4f75ad5SArd Biesheuvel if (start == 0x0) 264f4f75ad5SArd Biesheuvel start += 8; 265f4f75ad5SArd Biesheuvel 266f4f75ad5SArd Biesheuvel start = round_up(start, align); 267f4f75ad5SArd Biesheuvel if ((start + size) > end) 268f4f75ad5SArd Biesheuvel continue; 269f4f75ad5SArd Biesheuvel 270f4f75ad5SArd Biesheuvel status = efi_call_early(allocate_pages, 271f4f75ad5SArd Biesheuvel EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA, 272f4f75ad5SArd Biesheuvel nr_pages, &start); 273f4f75ad5SArd Biesheuvel if (status == EFI_SUCCESS) { 274f4f75ad5SArd Biesheuvel *addr = start; 275f4f75ad5SArd Biesheuvel break; 276f4f75ad5SArd Biesheuvel } 277f4f75ad5SArd Biesheuvel } 278f4f75ad5SArd Biesheuvel 279f4f75ad5SArd Biesheuvel if (i == map_size / desc_size) 280f4f75ad5SArd Biesheuvel status = EFI_NOT_FOUND; 281f4f75ad5SArd Biesheuvel 282f4f75ad5SArd Biesheuvel efi_call_early(free_pool, map); 283f4f75ad5SArd Biesheuvel fail: 284f4f75ad5SArd Biesheuvel return status; 285f4f75ad5SArd Biesheuvel } 286f4f75ad5SArd Biesheuvel 287f4f75ad5SArd Biesheuvel void efi_free(efi_system_table_t *sys_table_arg, unsigned long size, 288f4f75ad5SArd Biesheuvel unsigned long addr) 289f4f75ad5SArd Biesheuvel { 290f4f75ad5SArd Biesheuvel unsigned long nr_pages; 291f4f75ad5SArd Biesheuvel 292f4f75ad5SArd Biesheuvel if (!size) 293f4f75ad5SArd Biesheuvel return; 294f4f75ad5SArd Biesheuvel 295f4f75ad5SArd Biesheuvel nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; 296f4f75ad5SArd Biesheuvel efi_call_early(free_pages, addr, nr_pages); 297f4f75ad5SArd Biesheuvel } 298f4f75ad5SArd Biesheuvel 2995a17dae4SMatt Fleming /* 3005a17dae4SMatt Fleming * Parse the ASCII string 'cmdline' for EFI options, denoted by the efi= 3015a17dae4SMatt Fleming * option, e.g. efi=nochunk. 3025a17dae4SMatt Fleming * 3035a17dae4SMatt Fleming * It should be noted that efi= is parsed in two very different 3045a17dae4SMatt Fleming * environments, first in the early boot environment of the EFI boot 3055a17dae4SMatt Fleming * stub, and subsequently during the kernel boot. 3065a17dae4SMatt Fleming */ 3075a17dae4SMatt Fleming efi_status_t efi_parse_options(char *cmdline) 3085a17dae4SMatt Fleming { 3095a17dae4SMatt Fleming char *str; 3105a17dae4SMatt Fleming 3115a17dae4SMatt Fleming /* 3125a17dae4SMatt Fleming * If no EFI parameters were specified on the cmdline we've got 3135a17dae4SMatt Fleming * nothing to do. 3145a17dae4SMatt Fleming */ 3155a17dae4SMatt Fleming str = strstr(cmdline, "efi="); 3165a17dae4SMatt Fleming if (!str) 3175a17dae4SMatt Fleming return EFI_SUCCESS; 3185a17dae4SMatt Fleming 3195a17dae4SMatt Fleming /* Skip ahead to first argument */ 3205a17dae4SMatt Fleming str += strlen("efi="); 3215a17dae4SMatt Fleming 3225a17dae4SMatt Fleming /* 3235a17dae4SMatt Fleming * Remember, because efi= is also used by the kernel we need to 3245a17dae4SMatt Fleming * skip over arguments we don't understand. 3255a17dae4SMatt Fleming */ 3265a17dae4SMatt Fleming while (*str) { 3275a17dae4SMatt Fleming if (!strncmp(str, "nochunk", 7)) { 3285a17dae4SMatt Fleming str += strlen("nochunk"); 3295a17dae4SMatt Fleming __chunk_size = -1UL; 3305a17dae4SMatt Fleming } 3315a17dae4SMatt Fleming 3325a17dae4SMatt Fleming /* Group words together, delimited by "," */ 3335a17dae4SMatt Fleming while (*str && *str != ',') 3345a17dae4SMatt Fleming str++; 3355a17dae4SMatt Fleming 3365a17dae4SMatt Fleming if (*str == ',') 3375a17dae4SMatt Fleming str++; 3385a17dae4SMatt Fleming } 3395a17dae4SMatt Fleming 3405a17dae4SMatt Fleming return EFI_SUCCESS; 3415a17dae4SMatt Fleming } 342f4f75ad5SArd Biesheuvel 343f4f75ad5SArd Biesheuvel /* 344f4f75ad5SArd Biesheuvel * Check the cmdline for a LILO-style file= arguments. 345f4f75ad5SArd Biesheuvel * 346f4f75ad5SArd Biesheuvel * We only support loading a file from the same filesystem as 347f4f75ad5SArd Biesheuvel * the kernel image. 348f4f75ad5SArd Biesheuvel */ 349f4f75ad5SArd Biesheuvel efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg, 350f4f75ad5SArd Biesheuvel efi_loaded_image_t *image, 351f4f75ad5SArd Biesheuvel char *cmd_line, char *option_string, 352f4f75ad5SArd Biesheuvel unsigned long max_addr, 353f4f75ad5SArd Biesheuvel unsigned long *load_addr, 354f4f75ad5SArd Biesheuvel unsigned long *load_size) 355f4f75ad5SArd Biesheuvel { 356f4f75ad5SArd Biesheuvel struct file_info *files; 357f4f75ad5SArd Biesheuvel unsigned long file_addr; 358f4f75ad5SArd Biesheuvel u64 file_size_total; 359f4f75ad5SArd Biesheuvel efi_file_handle_t *fh = NULL; 360f4f75ad5SArd Biesheuvel efi_status_t status; 361f4f75ad5SArd Biesheuvel int nr_files; 362f4f75ad5SArd Biesheuvel char *str; 363f4f75ad5SArd Biesheuvel int i, j, k; 364f4f75ad5SArd Biesheuvel 365f4f75ad5SArd Biesheuvel file_addr = 0; 366f4f75ad5SArd Biesheuvel file_size_total = 0; 367f4f75ad5SArd Biesheuvel 368f4f75ad5SArd Biesheuvel str = cmd_line; 369f4f75ad5SArd Biesheuvel 370f4f75ad5SArd Biesheuvel j = 0; /* See close_handles */ 371f4f75ad5SArd Biesheuvel 372f4f75ad5SArd Biesheuvel if (!load_addr || !load_size) 373f4f75ad5SArd Biesheuvel return EFI_INVALID_PARAMETER; 374f4f75ad5SArd Biesheuvel 375f4f75ad5SArd Biesheuvel *load_addr = 0; 376f4f75ad5SArd Biesheuvel *load_size = 0; 377f4f75ad5SArd Biesheuvel 378f4f75ad5SArd Biesheuvel if (!str || !*str) 379f4f75ad5SArd Biesheuvel return EFI_SUCCESS; 380f4f75ad5SArd Biesheuvel 381f4f75ad5SArd Biesheuvel for (nr_files = 0; *str; nr_files++) { 382f4f75ad5SArd Biesheuvel str = strstr(str, option_string); 383f4f75ad5SArd Biesheuvel if (!str) 384f4f75ad5SArd Biesheuvel break; 385f4f75ad5SArd Biesheuvel 386f4f75ad5SArd Biesheuvel str += strlen(option_string); 387f4f75ad5SArd Biesheuvel 388f4f75ad5SArd Biesheuvel /* Skip any leading slashes */ 389f4f75ad5SArd Biesheuvel while (*str == '/' || *str == '\\') 390f4f75ad5SArd Biesheuvel str++; 391f4f75ad5SArd Biesheuvel 392f4f75ad5SArd Biesheuvel while (*str && *str != ' ' && *str != '\n') 393f4f75ad5SArd Biesheuvel str++; 394f4f75ad5SArd Biesheuvel } 395f4f75ad5SArd Biesheuvel 396f4f75ad5SArd Biesheuvel if (!nr_files) 397f4f75ad5SArd Biesheuvel return EFI_SUCCESS; 398f4f75ad5SArd Biesheuvel 399f4f75ad5SArd Biesheuvel status = efi_call_early(allocate_pool, EFI_LOADER_DATA, 400f4f75ad5SArd Biesheuvel nr_files * sizeof(*files), (void **)&files); 401f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) { 402f4f75ad5SArd Biesheuvel pr_efi_err(sys_table_arg, "Failed to alloc mem for file handle list\n"); 403f4f75ad5SArd Biesheuvel goto fail; 404f4f75ad5SArd Biesheuvel } 405f4f75ad5SArd Biesheuvel 406f4f75ad5SArd Biesheuvel str = cmd_line; 407f4f75ad5SArd Biesheuvel for (i = 0; i < nr_files; i++) { 408f4f75ad5SArd Biesheuvel struct file_info *file; 409f4f75ad5SArd Biesheuvel efi_char16_t filename_16[256]; 410f4f75ad5SArd Biesheuvel efi_char16_t *p; 411f4f75ad5SArd Biesheuvel 412f4f75ad5SArd Biesheuvel str = strstr(str, option_string); 413f4f75ad5SArd Biesheuvel if (!str) 414f4f75ad5SArd Biesheuvel break; 415f4f75ad5SArd Biesheuvel 416f4f75ad5SArd Biesheuvel str += strlen(option_string); 417f4f75ad5SArd Biesheuvel 418f4f75ad5SArd Biesheuvel file = &files[i]; 419f4f75ad5SArd Biesheuvel p = filename_16; 420f4f75ad5SArd Biesheuvel 421f4f75ad5SArd Biesheuvel /* Skip any leading slashes */ 422f4f75ad5SArd Biesheuvel while (*str == '/' || *str == '\\') 423f4f75ad5SArd Biesheuvel str++; 424f4f75ad5SArd Biesheuvel 425f4f75ad5SArd Biesheuvel while (*str && *str != ' ' && *str != '\n') { 426f4f75ad5SArd Biesheuvel if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16)) 427f4f75ad5SArd Biesheuvel break; 428f4f75ad5SArd Biesheuvel 429f4f75ad5SArd Biesheuvel if (*str == '/') { 430f4f75ad5SArd Biesheuvel *p++ = '\\'; 431f4f75ad5SArd Biesheuvel str++; 432f4f75ad5SArd Biesheuvel } else { 433f4f75ad5SArd Biesheuvel *p++ = *str++; 434f4f75ad5SArd Biesheuvel } 435f4f75ad5SArd Biesheuvel } 436f4f75ad5SArd Biesheuvel 437f4f75ad5SArd Biesheuvel *p = '\0'; 438f4f75ad5SArd Biesheuvel 439f4f75ad5SArd Biesheuvel /* Only open the volume once. */ 440f4f75ad5SArd Biesheuvel if (!i) { 441f4f75ad5SArd Biesheuvel status = efi_open_volume(sys_table_arg, image, 442f4f75ad5SArd Biesheuvel (void **)&fh); 443f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) 444f4f75ad5SArd Biesheuvel goto free_files; 445f4f75ad5SArd Biesheuvel } 446f4f75ad5SArd Biesheuvel 447f4f75ad5SArd Biesheuvel status = efi_file_size(sys_table_arg, fh, filename_16, 448f4f75ad5SArd Biesheuvel (void **)&file->handle, &file->size); 449f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) 450f4f75ad5SArd Biesheuvel goto close_handles; 451f4f75ad5SArd Biesheuvel 452f4f75ad5SArd Biesheuvel file_size_total += file->size; 453f4f75ad5SArd Biesheuvel } 454f4f75ad5SArd Biesheuvel 455f4f75ad5SArd Biesheuvel if (file_size_total) { 456f4f75ad5SArd Biesheuvel unsigned long addr; 457f4f75ad5SArd Biesheuvel 458f4f75ad5SArd Biesheuvel /* 459f4f75ad5SArd Biesheuvel * Multiple files need to be at consecutive addresses in memory, 460f4f75ad5SArd Biesheuvel * so allocate enough memory for all the files. This is used 461f4f75ad5SArd Biesheuvel * for loading multiple files. 462f4f75ad5SArd Biesheuvel */ 463f4f75ad5SArd Biesheuvel status = efi_high_alloc(sys_table_arg, file_size_total, 0x1000, 464f4f75ad5SArd Biesheuvel &file_addr, max_addr); 465f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) { 466f4f75ad5SArd Biesheuvel pr_efi_err(sys_table_arg, "Failed to alloc highmem for files\n"); 467f4f75ad5SArd Biesheuvel goto close_handles; 468f4f75ad5SArd Biesheuvel } 469f4f75ad5SArd Biesheuvel 470f4f75ad5SArd Biesheuvel /* We've run out of free low memory. */ 471f4f75ad5SArd Biesheuvel if (file_addr > max_addr) { 472f4f75ad5SArd Biesheuvel pr_efi_err(sys_table_arg, "We've run out of free low memory\n"); 473f4f75ad5SArd Biesheuvel status = EFI_INVALID_PARAMETER; 474f4f75ad5SArd Biesheuvel goto free_file_total; 475f4f75ad5SArd Biesheuvel } 476f4f75ad5SArd Biesheuvel 477f4f75ad5SArd Biesheuvel addr = file_addr; 478f4f75ad5SArd Biesheuvel for (j = 0; j < nr_files; j++) { 479f4f75ad5SArd Biesheuvel unsigned long size; 480f4f75ad5SArd Biesheuvel 481f4f75ad5SArd Biesheuvel size = files[j].size; 482f4f75ad5SArd Biesheuvel while (size) { 483f4f75ad5SArd Biesheuvel unsigned long chunksize; 4845a17dae4SMatt Fleming if (size > __chunk_size) 4855a17dae4SMatt Fleming chunksize = __chunk_size; 486f4f75ad5SArd Biesheuvel else 487f4f75ad5SArd Biesheuvel chunksize = size; 488f4f75ad5SArd Biesheuvel 489f4f75ad5SArd Biesheuvel status = efi_file_read(files[j].handle, 490f4f75ad5SArd Biesheuvel &chunksize, 491f4f75ad5SArd Biesheuvel (void *)addr); 492f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) { 493f4f75ad5SArd Biesheuvel pr_efi_err(sys_table_arg, "Failed to read file\n"); 494f4f75ad5SArd Biesheuvel goto free_file_total; 495f4f75ad5SArd Biesheuvel } 496f4f75ad5SArd Biesheuvel addr += chunksize; 497f4f75ad5SArd Biesheuvel size -= chunksize; 498f4f75ad5SArd Biesheuvel } 499f4f75ad5SArd Biesheuvel 500f4f75ad5SArd Biesheuvel efi_file_close(files[j].handle); 501f4f75ad5SArd Biesheuvel } 502f4f75ad5SArd Biesheuvel 503f4f75ad5SArd Biesheuvel } 504f4f75ad5SArd Biesheuvel 505f4f75ad5SArd Biesheuvel efi_call_early(free_pool, files); 506f4f75ad5SArd Biesheuvel 507f4f75ad5SArd Biesheuvel *load_addr = file_addr; 508f4f75ad5SArd Biesheuvel *load_size = file_size_total; 509f4f75ad5SArd Biesheuvel 510f4f75ad5SArd Biesheuvel return status; 511f4f75ad5SArd Biesheuvel 512f4f75ad5SArd Biesheuvel free_file_total: 513f4f75ad5SArd Biesheuvel efi_free(sys_table_arg, file_size_total, file_addr); 514f4f75ad5SArd Biesheuvel 515f4f75ad5SArd Biesheuvel close_handles: 516f4f75ad5SArd Biesheuvel for (k = j; k < i; k++) 517f4f75ad5SArd Biesheuvel efi_file_close(files[k].handle); 518f4f75ad5SArd Biesheuvel free_files: 519f4f75ad5SArd Biesheuvel efi_call_early(free_pool, files); 520f4f75ad5SArd Biesheuvel fail: 521f4f75ad5SArd Biesheuvel *load_addr = 0; 522f4f75ad5SArd Biesheuvel *load_size = 0; 523f4f75ad5SArd Biesheuvel 524f4f75ad5SArd Biesheuvel return status; 525f4f75ad5SArd Biesheuvel } 526f4f75ad5SArd Biesheuvel /* 527f4f75ad5SArd Biesheuvel * Relocate a kernel image, either compressed or uncompressed. 528f4f75ad5SArd Biesheuvel * In the ARM64 case, all kernel images are currently 529f4f75ad5SArd Biesheuvel * uncompressed, and as such when we relocate it we need to 530f4f75ad5SArd Biesheuvel * allocate additional space for the BSS segment. Any low 531f4f75ad5SArd Biesheuvel * memory that this function should avoid needs to be 532f4f75ad5SArd Biesheuvel * unavailable in the EFI memory map, as if the preferred 533f4f75ad5SArd Biesheuvel * address is not available the lowest available address will 534f4f75ad5SArd Biesheuvel * be used. 535f4f75ad5SArd Biesheuvel */ 536f4f75ad5SArd Biesheuvel efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg, 537f4f75ad5SArd Biesheuvel unsigned long *image_addr, 538f4f75ad5SArd Biesheuvel unsigned long image_size, 539f4f75ad5SArd Biesheuvel unsigned long alloc_size, 540f4f75ad5SArd Biesheuvel unsigned long preferred_addr, 541f4f75ad5SArd Biesheuvel unsigned long alignment) 542f4f75ad5SArd Biesheuvel { 543f4f75ad5SArd Biesheuvel unsigned long cur_image_addr; 544f4f75ad5SArd Biesheuvel unsigned long new_addr = 0; 545f4f75ad5SArd Biesheuvel efi_status_t status; 546f4f75ad5SArd Biesheuvel unsigned long nr_pages; 547f4f75ad5SArd Biesheuvel efi_physical_addr_t efi_addr = preferred_addr; 548f4f75ad5SArd Biesheuvel 549f4f75ad5SArd Biesheuvel if (!image_addr || !image_size || !alloc_size) 550f4f75ad5SArd Biesheuvel return EFI_INVALID_PARAMETER; 551f4f75ad5SArd Biesheuvel if (alloc_size < image_size) 552f4f75ad5SArd Biesheuvel return EFI_INVALID_PARAMETER; 553f4f75ad5SArd Biesheuvel 554f4f75ad5SArd Biesheuvel cur_image_addr = *image_addr; 555f4f75ad5SArd Biesheuvel 556f4f75ad5SArd Biesheuvel /* 557f4f75ad5SArd Biesheuvel * The EFI firmware loader could have placed the kernel image 558f4f75ad5SArd Biesheuvel * anywhere in memory, but the kernel has restrictions on the 559f4f75ad5SArd Biesheuvel * max physical address it can run at. Some architectures 560f4f75ad5SArd Biesheuvel * also have a prefered address, so first try to relocate 561f4f75ad5SArd Biesheuvel * to the preferred address. If that fails, allocate as low 562f4f75ad5SArd Biesheuvel * as possible while respecting the required alignment. 563f4f75ad5SArd Biesheuvel */ 564f4f75ad5SArd Biesheuvel nr_pages = round_up(alloc_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; 565f4f75ad5SArd Biesheuvel status = efi_call_early(allocate_pages, 566f4f75ad5SArd Biesheuvel EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA, 567f4f75ad5SArd Biesheuvel nr_pages, &efi_addr); 568f4f75ad5SArd Biesheuvel new_addr = efi_addr; 569f4f75ad5SArd Biesheuvel /* 570f4f75ad5SArd Biesheuvel * If preferred address allocation failed allocate as low as 571f4f75ad5SArd Biesheuvel * possible. 572f4f75ad5SArd Biesheuvel */ 573f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) { 574f4f75ad5SArd Biesheuvel status = efi_low_alloc(sys_table_arg, alloc_size, alignment, 575f4f75ad5SArd Biesheuvel &new_addr); 576f4f75ad5SArd Biesheuvel } 577f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) { 578f4f75ad5SArd Biesheuvel pr_efi_err(sys_table_arg, "Failed to allocate usable memory for kernel.\n"); 579f4f75ad5SArd Biesheuvel return status; 580f4f75ad5SArd Biesheuvel } 581f4f75ad5SArd Biesheuvel 582f4f75ad5SArd Biesheuvel /* 583f4f75ad5SArd Biesheuvel * We know source/dest won't overlap since both memory ranges 584f4f75ad5SArd Biesheuvel * have been allocated by UEFI, so we can safely use memcpy. 585f4f75ad5SArd Biesheuvel */ 586f4f75ad5SArd Biesheuvel memcpy((void *)new_addr, (void *)cur_image_addr, image_size); 587f4f75ad5SArd Biesheuvel 588f4f75ad5SArd Biesheuvel /* Return the new address of the relocated image. */ 589f4f75ad5SArd Biesheuvel *image_addr = new_addr; 590f4f75ad5SArd Biesheuvel 591f4f75ad5SArd Biesheuvel return status; 592f4f75ad5SArd Biesheuvel } 593f4f75ad5SArd Biesheuvel 594f4f75ad5SArd Biesheuvel /* 595f4f75ad5SArd Biesheuvel * Get the number of UTF-8 bytes corresponding to an UTF-16 character. 596f4f75ad5SArd Biesheuvel * This overestimates for surrogates, but that is okay. 597f4f75ad5SArd Biesheuvel */ 598f4f75ad5SArd Biesheuvel static int efi_utf8_bytes(u16 c) 599f4f75ad5SArd Biesheuvel { 600f4f75ad5SArd Biesheuvel return 1 + (c >= 0x80) + (c >= 0x800); 601f4f75ad5SArd Biesheuvel } 602f4f75ad5SArd Biesheuvel 603f4f75ad5SArd Biesheuvel /* 604f4f75ad5SArd Biesheuvel * Convert an UTF-16 string, not necessarily null terminated, to UTF-8. 605f4f75ad5SArd Biesheuvel */ 606f4f75ad5SArd Biesheuvel static u8 *efi_utf16_to_utf8(u8 *dst, const u16 *src, int n) 607f4f75ad5SArd Biesheuvel { 608f4f75ad5SArd Biesheuvel unsigned int c; 609f4f75ad5SArd Biesheuvel 610f4f75ad5SArd Biesheuvel while (n--) { 611f4f75ad5SArd Biesheuvel c = *src++; 612f4f75ad5SArd Biesheuvel if (n && c >= 0xd800 && c <= 0xdbff && 613f4f75ad5SArd Biesheuvel *src >= 0xdc00 && *src <= 0xdfff) { 614f4f75ad5SArd Biesheuvel c = 0x10000 + ((c & 0x3ff) << 10) + (*src & 0x3ff); 615f4f75ad5SArd Biesheuvel src++; 616f4f75ad5SArd Biesheuvel n--; 617f4f75ad5SArd Biesheuvel } 618f4f75ad5SArd Biesheuvel if (c >= 0xd800 && c <= 0xdfff) 619f4f75ad5SArd Biesheuvel c = 0xfffd; /* Unmatched surrogate */ 620f4f75ad5SArd Biesheuvel if (c < 0x80) { 621f4f75ad5SArd Biesheuvel *dst++ = c; 622f4f75ad5SArd Biesheuvel continue; 623f4f75ad5SArd Biesheuvel } 624f4f75ad5SArd Biesheuvel if (c < 0x800) { 625f4f75ad5SArd Biesheuvel *dst++ = 0xc0 + (c >> 6); 626f4f75ad5SArd Biesheuvel goto t1; 627f4f75ad5SArd Biesheuvel } 628f4f75ad5SArd Biesheuvel if (c < 0x10000) { 629f4f75ad5SArd Biesheuvel *dst++ = 0xe0 + (c >> 12); 630f4f75ad5SArd Biesheuvel goto t2; 631f4f75ad5SArd Biesheuvel } 632f4f75ad5SArd Biesheuvel *dst++ = 0xf0 + (c >> 18); 633f4f75ad5SArd Biesheuvel *dst++ = 0x80 + ((c >> 12) & 0x3f); 634f4f75ad5SArd Biesheuvel t2: 635f4f75ad5SArd Biesheuvel *dst++ = 0x80 + ((c >> 6) & 0x3f); 636f4f75ad5SArd Biesheuvel t1: 637f4f75ad5SArd Biesheuvel *dst++ = 0x80 + (c & 0x3f); 638f4f75ad5SArd Biesheuvel } 639f4f75ad5SArd Biesheuvel 640f4f75ad5SArd Biesheuvel return dst; 641f4f75ad5SArd Biesheuvel } 642f4f75ad5SArd Biesheuvel 643f4f75ad5SArd Biesheuvel /* 644f4f75ad5SArd Biesheuvel * Convert the unicode UEFI command line to ASCII to pass to kernel. 645f4f75ad5SArd Biesheuvel * Size of memory allocated return in *cmd_line_len. 646f4f75ad5SArd Biesheuvel * Returns NULL on error. 647f4f75ad5SArd Biesheuvel */ 648f4f75ad5SArd Biesheuvel char *efi_convert_cmdline(efi_system_table_t *sys_table_arg, 649f4f75ad5SArd Biesheuvel efi_loaded_image_t *image, 650f4f75ad5SArd Biesheuvel int *cmd_line_len) 651f4f75ad5SArd Biesheuvel { 652f4f75ad5SArd Biesheuvel const u16 *s2; 653f4f75ad5SArd Biesheuvel u8 *s1 = NULL; 654f4f75ad5SArd Biesheuvel unsigned long cmdline_addr = 0; 655f4f75ad5SArd Biesheuvel int load_options_chars = image->load_options_size / 2; /* UTF-16 */ 656f4f75ad5SArd Biesheuvel const u16 *options = image->load_options; 657f4f75ad5SArd Biesheuvel int options_bytes = 0; /* UTF-8 bytes */ 658f4f75ad5SArd Biesheuvel int options_chars = 0; /* UTF-16 chars */ 659f4f75ad5SArd Biesheuvel efi_status_t status; 660f4f75ad5SArd Biesheuvel u16 zero = 0; 661f4f75ad5SArd Biesheuvel 662f4f75ad5SArd Biesheuvel if (options) { 663f4f75ad5SArd Biesheuvel s2 = options; 664f4f75ad5SArd Biesheuvel while (*s2 && *s2 != '\n' 665f4f75ad5SArd Biesheuvel && options_chars < load_options_chars) { 666f4f75ad5SArd Biesheuvel options_bytes += efi_utf8_bytes(*s2++); 667f4f75ad5SArd Biesheuvel options_chars++; 668f4f75ad5SArd Biesheuvel } 669f4f75ad5SArd Biesheuvel } 670f4f75ad5SArd Biesheuvel 671f4f75ad5SArd Biesheuvel if (!options_chars) { 672f4f75ad5SArd Biesheuvel /* No command line options, so return empty string*/ 673f4f75ad5SArd Biesheuvel options = &zero; 674f4f75ad5SArd Biesheuvel } 675f4f75ad5SArd Biesheuvel 676f4f75ad5SArd Biesheuvel options_bytes++; /* NUL termination */ 677f4f75ad5SArd Biesheuvel 678f4f75ad5SArd Biesheuvel status = efi_low_alloc(sys_table_arg, options_bytes, 0, &cmdline_addr); 679f4f75ad5SArd Biesheuvel if (status != EFI_SUCCESS) 680f4f75ad5SArd Biesheuvel return NULL; 681f4f75ad5SArd Biesheuvel 682f4f75ad5SArd Biesheuvel s1 = (u8 *)cmdline_addr; 683f4f75ad5SArd Biesheuvel s2 = (const u16 *)options; 684f4f75ad5SArd Biesheuvel 685f4f75ad5SArd Biesheuvel s1 = efi_utf16_to_utf8(s1, s2, options_chars); 686f4f75ad5SArd Biesheuvel *s1 = '\0'; 687f4f75ad5SArd Biesheuvel 688f4f75ad5SArd Biesheuvel *cmd_line_len = options_bytes; 689f4f75ad5SArd Biesheuvel return (char *)cmdline_addr; 690f4f75ad5SArd Biesheuvel } 691