efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table, void *handle, unsigned long *new_fdt_addr, unsigned long max_addr, u64 initrd_addr, u64 initrd_size, char *cmdline_ptr, unsigned long fdt_addr, unsigned long fdt_size) { unsigned long map_size, desc_size, buff_size; u32 desc_ver; unsigned long mmap_key; efi_memory_desc_t *memory_map, *runtime_map; unsigned long new_fdt_size; efi_status_t status; int runtime_entry_count = 0; struct efi_boot_memmap map; struct exit_boot_struct priv; map.map = &runtime_map; map.map_size = &map_size; map.desc_size = &desc_size; map.desc_ver = &desc_ver; map.key_ptr = &mmap_key; map.buff_size = &buff_size; /* * Get a copy of the current memory map that we will use to prepare * the input for SetVirtualAddressMap(). We don't have to worry about * subsequent allocations adding entries, since they could not affect * the number of EFI_MEMORY_RUNTIME regions. */ status = efi_get_memory_map(sys_table, &map); if (status != EFI_SUCCESS) { pr_efi_err(sys_table, "Unable to retrieve UEFI memory map.\n"); return status; } pr_efi(sys_table, "Exiting boot services and installing virtual address map...\n"); map.map = &memory_map; /* * Estimate size of new FDT, and allocate memory for it. We * will allocate a bigger buffer if this ends up being too * small, so a rough guess is OK here. */ new_fdt_size = fdt_size + EFI_PAGE_SIZE; while (1) { status = efi_high_alloc(sys_table, new_fdt_size, EFI_FDT_ALIGN, new_fdt_addr, max_addr); if (status != EFI_SUCCESS) { pr_efi_err(sys_table, "Unable to allocate memory for new device tree.\n"); goto fail; } /* * Now that we have done our final memory allocation (and free) * we can get the memory map key needed for * exit_boot_services(). */ status = efi_get_memory_map(sys_table, &map); if (status != EFI_SUCCESS) goto fail_free_new_fdt; status = update_fdt(sys_table, (void *)fdt_addr, fdt_size, (void *)*new_fdt_addr, new_fdt_size, cmdline_ptr, initrd_addr, initrd_size, memory_map, map_size, desc_size, desc_ver); /* Succeeding the first time is the expected case. */ if (status == EFI_SUCCESS) break; if (status == EFI_BUFFER_TOO_SMALL) { /* * We need to allocate more space for the new * device tree, so free existing buffer that is * too small. Also free memory map, as we will need * to get new one that reflects the free/alloc we do * on the device tree buffer. */ efi_free(sys_table, new_fdt_size, *new_fdt_addr); sys_table->boottime->free_pool(memory_map); new_fdt_size += EFI_PAGE_SIZE; } else { pr_efi_err(sys_table, "Unable to construct new device tree.\n"); goto fail_free_mmap; } } sys_table->boottime->free_pool(memory_map); priv.runtime_map = runtime_map; priv.runtime_entry_count = &runtime_entry_count; status = efi_exit_boot_services(sys_table, handle, &map, &priv, exit_boot_func); if (status == EFI_SUCCESS) { efi_set_virtual_address_map_t *svam; /* Install the new virtual address map */ svam = sys_table->runtime->set_virtual_address_map; status = svam(runtime_entry_count * desc_size, desc_size, desc_ver, runtime_map); /* * We are beyond the point of no return here, so if the call to * SetVirtualAddressMap() failed, we need to signal that to the * incoming kernel but proceed normally otherwise. */ if (status != EFI_SUCCESS) { int l; /* * Set the virtual address field of all * EFI_MEMORY_RUNTIME entries to 0. This will signal * the incoming kernel that no virtual translation has * been installed. */ for (l = 0; l < map_size; l += desc_size) { efi_memory_desc_t *p = (void *)memory_map + l; if (p->attribute & EFI_MEMORY_RUNTIME) p->virt_addr = 0; } } return EFI_SUCCESS; } pr_efi_err(sys_table, "Exit boot services failed.\n"); fail_free_mmap: sys_table->boottime->free_pool(memory_map); fail_free_new_fdt: efi_free(sys_table, new_fdt_size, *new_fdt_addr); fail: sys_table->boottime->free_pool(runtime_map); return EFI_LOAD_ERROR; }
/* * EFI entry point for the arm/arm64 EFI stubs. This is the entrypoint * that is described in the PE/COFF header. Most of the code is the same * for both archictectures, with the arch-specific code provided in the * handle_kernel_image() function. */ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table, unsigned long *image_addr) { efi_loaded_image_t *image; efi_status_t status; unsigned long image_size = 0; unsigned long dram_base; /* addr/point and size pairs for memory management*/ unsigned long initrd_addr; u64 initrd_size = 0; unsigned long fdt_addr = 0; /* Original DTB */ unsigned long fdt_size = 0; char *cmdline_ptr = NULL; int cmdline_size = 0; unsigned long new_fdt_addr; efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID; unsigned long reserve_addr = 0; unsigned long reserve_size = 0; /* Check if we were booted by the EFI firmware */ if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) goto fail; pr_efi(sys_table, "Booting Linux Kernel...\n"); /* * Get a handle to the loaded image protocol. This is used to get * information about the running image, such as size and the command * line. */ status = sys_table->boottime->handle_protocol(handle, &loaded_image_proto, (void *)&image); if (status != EFI_SUCCESS) { pr_efi_err(sys_table, "Failed to get loaded image protocol\n"); goto fail; } dram_base = get_dram_base(sys_table); if (dram_base == EFI_ERROR) { pr_efi_err(sys_table, "Failed to find DRAM base\n"); goto fail; } status = handle_kernel_image(sys_table, image_addr, &image_size, &reserve_addr, &reserve_size, dram_base, image); if (status != EFI_SUCCESS) { pr_efi_err(sys_table, "Failed to relocate kernel\n"); goto fail; } /* * Get the command line from EFI, using the LOADED_IMAGE * protocol. We are going to copy the command line into the * device tree, so this can be allocated anywhere. */ cmdline_ptr = efi_convert_cmdline(sys_table, image, &cmdline_size); if (!cmdline_ptr) { pr_efi_err(sys_table, "getting command line via LOADED_IMAGE_PROTOCOL\n"); goto fail_free_image; } status = efi_parse_options(cmdline_ptr); if (status != EFI_SUCCESS) pr_efi_err(sys_table, "Failed to parse EFI cmdline options\n"); /* * Unauthenticated device tree data is a security hazard, so * ignore 'dtb=' unless UEFI Secure Boot is disabled. */ if (efi_secureboot_enabled(sys_table)) { pr_efi(sys_table, "UEFI Secure Boot is enabled.\n"); } else { status = handle_cmdline_files(sys_table, image, cmdline_ptr, "dtb=", ~0UL, &fdt_addr, &fdt_size); if (status != EFI_SUCCESS) { pr_efi_err(sys_table, "Failed to load device tree!\n"); goto fail_free_cmdline; } } if (fdt_addr) { pr_efi(sys_table, "Using DTB from command line\n"); } else { /* Look for a device tree configuration table entry. */ fdt_addr = (uintptr_t)get_fdt(sys_table, &fdt_size); if (fdt_addr) pr_efi(sys_table, "Using DTB from configuration table\n"); } if (!fdt_addr) pr_efi(sys_table, "Generating empty DTB\n"); status = handle_cmdline_files(sys_table, image, cmdline_ptr, "initrd=", dram_base + SZ_512M, (unsigned long *)&initrd_addr, (unsigned long *)&initrd_size); if (status != EFI_SUCCESS) pr_efi_err(sys_table, "Failed initrd from command line!\n"); new_fdt_addr = fdt_addr; status = allocate_new_fdt_and_exit_boot(sys_table, handle, &new_fdt_addr, dram_base + MAX_FDT_OFFSET, initrd_addr, initrd_size, cmdline_ptr, fdt_addr, fdt_size); /* * If all went well, we need to return the FDT address to the * calling function so it can be passed to kernel as part of * the kernel boot protocol. */ if (status == EFI_SUCCESS) return new_fdt_addr; pr_efi_err(sys_table, "Failed to update FDT and exit boot services\n"); efi_free(sys_table, initrd_size, initrd_addr); efi_free(sys_table, fdt_size, fdt_addr); fail_free_cmdline: efi_free(sys_table, cmdline_size, (unsigned long)cmdline_ptr); fail_free_image: efi_free(sys_table, image_size, *image_addr); efi_free(sys_table, reserve_size, reserve_addr); fail: return EFI_ERROR; }
efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt, unsigned long orig_fdt_size, void *fdt, int new_fdt_size, char *cmdline_ptr, u64 initrd_addr, u64 initrd_size, efi_memory_desc_t *memory_map, unsigned long map_size, unsigned long desc_size, u32 desc_ver) { int node, num_rsv; int status; u32 fdt_val32; u64 fdt_val64; /* Do some checks on provided FDT, if it exists*/ if (orig_fdt) { if (fdt_check_header(orig_fdt)) { pr_efi_err(sys_table, "Device Tree header not valid!\n"); return EFI_LOAD_ERROR; } /* * We don't get the size of the FDT if we get if from a * configuration table. */ if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) { pr_efi_err(sys_table, "Truncated device tree! foo!\n"); return EFI_LOAD_ERROR; } } if (orig_fdt) status = fdt_open_into(orig_fdt, fdt, new_fdt_size); else status = fdt_create_empty_tree(fdt, new_fdt_size); if (status != 0) goto fdt_set_fail; /* * Delete all memory reserve map entries. When booting via UEFI, * kernel will use the UEFI memory map to find reserved regions. */ num_rsv = fdt_num_mem_rsv(fdt); while (num_rsv-- > 0) fdt_del_mem_rsv(fdt, num_rsv); node = fdt_subnode_offset(fdt, 0, "chosen"); if (node < 0) { node = fdt_add_subnode(fdt, 0, "chosen"); if (node < 0) { status = node; /* node is error code when negative */ goto fdt_set_fail; } } if ((cmdline_ptr != NULL) && (strlen(cmdline_ptr) > 0)) { status = fdt_setprop(fdt, node, "bootargs", cmdline_ptr, strlen(cmdline_ptr) + 1); if (status) goto fdt_set_fail; } /* Set initrd address/end in device tree, if present */ if (initrd_size != 0) { u64 initrd_image_end; u64 initrd_image_start = cpu_to_fdt64(initrd_addr); status = fdt_setprop(fdt, node, "linux,initrd-start", &initrd_image_start, sizeof(u64)); if (status) goto fdt_set_fail; initrd_image_end = cpu_to_fdt64(initrd_addr + initrd_size); status = fdt_setprop(fdt, node, "linux,initrd-end", &initrd_image_end, sizeof(u64)); if (status) goto fdt_set_fail; } /* Add FDT entries for EFI runtime services in chosen node. */ node = fdt_subnode_offset(fdt, 0, "chosen"); fdt_val64 = cpu_to_fdt64((u64)(unsigned long)sys_table); status = fdt_setprop(fdt, node, "linux,uefi-system-table", &fdt_val64, sizeof(fdt_val64)); if (status) goto fdt_set_fail; fdt_val64 = cpu_to_fdt64((u64)(unsigned long)memory_map); status = fdt_setprop(fdt, node, "linux,uefi-mmap-start", &fdt_val64, sizeof(fdt_val64)); if (status) goto fdt_set_fail; fdt_val32 = cpu_to_fdt32(map_size); status = fdt_setprop(fdt, node, "linux,uefi-mmap-size", &fdt_val32, sizeof(fdt_val32)); if (status) goto fdt_set_fail; fdt_val32 = cpu_to_fdt32(desc_size); status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-size", &fdt_val32, sizeof(fdt_val32)); if (status) goto fdt_set_fail; fdt_val32 = cpu_to_fdt32(desc_ver); status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-ver", &fdt_val32, sizeof(fdt_val32)); if (status) goto fdt_set_fail; if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) { efi_status_t efi_status; efi_status = efi_get_random_bytes(sys_table, sizeof(fdt_val64), (u8 *)&fdt_val64); if (efi_status == EFI_SUCCESS) { status = fdt_setprop(fdt, node, "kaslr-seed", &fdt_val64, sizeof(fdt_val64)); if (status) goto fdt_set_fail; } else if (efi_status != EFI_NOT_FOUND) { return efi_status; } } return EFI_SUCCESS; fdt_set_fail: if (status == -FDT_ERR_NOSPACE) return EFI_BUFFER_TOO_SMALL; return EFI_LOAD_ERROR; }
/* * Check the cmdline for a LILO-style file= arguments. * * We only support loading a file from the same filesystem as * the kernel image. */ efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg, efi_loaded_image_t *image, char *cmd_line, char *option_string, unsigned long max_addr, unsigned long *load_addr, unsigned long *load_size) { struct file_info *files; unsigned long file_addr; u64 file_size_total; efi_file_handle_t *fh = NULL; efi_status_t status; int nr_files; char *str; int i, j, k; file_addr = 0; file_size_total = 0; str = cmd_line; j = 0; /* See close_handles */ if (!load_addr || !load_size) return EFI_INVALID_PARAMETER; *load_addr = 0; *load_size = 0; if (!str || !*str) return EFI_SUCCESS; for (nr_files = 0; *str; nr_files++) { str = strstr(str, option_string); if (!str) break; str += strlen(option_string); /* Skip any leading slashes */ while (*str == '/' || *str == '\\') str++; while (*str && *str != ' ' && *str != '\n') str++; } if (!nr_files) return EFI_SUCCESS; status = efi_call_early(allocate_pool, EFI_LOADER_DATA, nr_files * sizeof(*files), (void **)&files); if (status != EFI_SUCCESS) { pr_efi_err(sys_table_arg, "Failed to alloc mem for file handle list\n"); goto fail; } str = cmd_line; for (i = 0; i < nr_files; i++) { struct file_info *file; efi_char16_t filename_16[256]; efi_char16_t *p; str = strstr(str, option_string); if (!str) break; str += strlen(option_string); file = &files[i]; p = filename_16; /* Skip any leading slashes */ while (*str == '/' || *str == '\\') str++; while (*str && *str != ' ' && *str != '\n') { if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16)) break; if (*str == '/') { *p++ = '\\'; str++; } else { *p++ = *str++; } } *p = '\0'; /* Only open the volume once. */ if (!i) { status = efi_open_volume(sys_table_arg, image, (void **)&fh); if (status != EFI_SUCCESS) goto free_files; } status = efi_file_size(sys_table_arg, fh, filename_16, (void **)&file->handle, &file->size); if (status != EFI_SUCCESS) goto close_handles; file_size_total += file->size; } if (file_size_total) { unsigned long addr; /* * Multiple files need to be at consecutive addresses in memory, * so allocate enough memory for all the files. This is used * for loading multiple files. */ status = efi_high_alloc(sys_table_arg, file_size_total, 0x1000, &file_addr, max_addr); if (status != EFI_SUCCESS) { pr_efi_err(sys_table_arg, "Failed to alloc highmem for files\n"); goto close_handles; } /* We've run out of free low memory. */ if (file_addr > max_addr) { pr_efi_err(sys_table_arg, "We've run out of free low memory\n"); status = EFI_INVALID_PARAMETER; goto free_file_total; } addr = file_addr; for (j = 0; j < nr_files; j++) { unsigned long size; size = files[j].size; while (size) { unsigned long chunksize; if (size > __chunk_size) chunksize = __chunk_size; else chunksize = size; status = efi_file_read(files[j].handle, &chunksize, (void *)addr); if (status != EFI_SUCCESS) { pr_efi_err(sys_table_arg, "Failed to read file\n"); goto free_file_total; } addr += chunksize; size -= chunksize; } efi_file_close(files[j].handle); } } efi_call_early(free_pool, files); *load_addr = file_addr; *load_size = file_size_total; return status; free_file_total: efi_free(sys_table_arg, file_size_total, file_addr); close_handles: for (k = j; k < i; k++) efi_file_close(files[k].handle); free_files: efi_call_early(free_pool, files); fail: *load_addr = 0; *load_size = 0; return status; }
efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt, unsigned long orig_fdt_size, void *fdt, int new_fdt_size, char *cmdline_ptr, u64 initrd_addr, u64 initrd_size, efi_memory_desc_t *memory_map, unsigned long map_size, unsigned long desc_size, u32 desc_ver) { int node, prev, num_rsv; int status; u32 fdt_val32; u64 fdt_val64; /* Do some checks on provided FDT, if it exists*/ if (orig_fdt) { if (fdt_check_header(orig_fdt)) { pr_efi_err(sys_table, "Device Tree header not valid!\n"); return EFI_LOAD_ERROR; } /* * We don't get the size of the FDT if we get if from a * configuration table. */ if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) { pr_efi_err(sys_table, "Truncated device tree! foo!\n"); return EFI_LOAD_ERROR; } } if (orig_fdt) status = fdt_open_into(orig_fdt, fdt, new_fdt_size); else status = fdt_create_empty_tree(fdt, new_fdt_size); if (status != 0) goto fdt_set_fail; /* * Delete any memory nodes present. We must delete nodes which * early_init_dt_scan_memory may try to use. */ prev = 0; for (;;) { const char *type; int len; node = fdt_next_node(fdt, prev, NULL); if (node < 0) break; type = fdt_getprop(fdt, node, "device_type", &len); if (type && strncmp(type, "memory", len) == 0) { fdt_del_node(fdt, node); continue; } prev = node; } /* * Delete all memory reserve map entries. When booting via UEFI, * kernel will use the UEFI memory map to find reserved regions. */ num_rsv = fdt_num_mem_rsv(fdt); while (num_rsv-- > 0) fdt_del_mem_rsv(fdt, num_rsv); node = fdt_subnode_offset(fdt, 0, "chosen"); if (node < 0) { node = fdt_add_subnode(fdt, 0, "chosen"); if (node < 0) { status = node; /* node is error code when negative */ goto fdt_set_fail; } } if ((cmdline_ptr != NULL) && (strlen(cmdline_ptr) > 0)) { status = fdt_setprop(fdt, node, "bootargs", cmdline_ptr, strlen(cmdline_ptr) + 1); if (status) goto fdt_set_fail; } /* Set initrd address/end in device tree, if present */ if (initrd_size != 0) { u64 initrd_image_end; u64 initrd_image_start = cpu_to_fdt64(initrd_addr); status = fdt_setprop(fdt, node, "linux,initrd-start", &initrd_image_start, sizeof(u64)); if (status) goto fdt_set_fail; initrd_image_end = cpu_to_fdt64(initrd_addr + initrd_size); status = fdt_setprop(fdt, node, "linux,initrd-end", &initrd_image_end, sizeof(u64)); if (status) goto fdt_set_fail; } /* Add FDT entries for EFI runtime services in chosen node. */ node = fdt_subnode_offset(fdt, 0, "chosen"); fdt_val64 = cpu_to_fdt64((u64)(unsigned long)sys_table); status = fdt_setprop(fdt, node, "linux,uefi-system-table", &fdt_val64, sizeof(fdt_val64)); if (status) goto fdt_set_fail; fdt_val64 = cpu_to_fdt64((u64)(unsigned long)memory_map); status = fdt_setprop(fdt, node, "linux,uefi-mmap-start", &fdt_val64, sizeof(fdt_val64)); if (status) goto fdt_set_fail; fdt_val32 = cpu_to_fdt32(map_size); status = fdt_setprop(fdt, node, "linux,uefi-mmap-size", &fdt_val32, sizeof(fdt_val32)); if (status) goto fdt_set_fail; fdt_val32 = cpu_to_fdt32(desc_size); status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-size", &fdt_val32, sizeof(fdt_val32)); if (status) goto fdt_set_fail; fdt_val32 = cpu_to_fdt32(desc_ver); status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-ver", &fdt_val32, sizeof(fdt_val32)); if (status) goto fdt_set_fail; return EFI_SUCCESS; fdt_set_fail: if (status == -FDT_ERR_NOSPACE) return EFI_BUFFER_TOO_SMALL; return EFI_LOAD_ERROR; }
efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table, void *handle, unsigned long *new_fdt_addr, unsigned long max_addr, u64 initrd_addr, u64 initrd_size, char *cmdline_ptr, unsigned long fdt_addr, unsigned long fdt_size) { unsigned long map_size, desc_size; u32 desc_ver; unsigned long mmap_key; efi_memory_desc_t *memory_map; unsigned long new_fdt_size; efi_status_t status; /* * Estimate size of new FDT, and allocate memory for it. We * will allocate a bigger buffer if this ends up being too * small, so a rough guess is OK here. */ new_fdt_size = fdt_size + EFI_PAGE_SIZE; while (1) { status = efi_high_alloc(sys_table, new_fdt_size, EFI_FDT_ALIGN, new_fdt_addr, max_addr); if (status != EFI_SUCCESS) { pr_efi_err(sys_table, "Unable to allocate memory for new device tree.\n"); goto fail; } /* * Now that we have done our final memory allocation (and free) * we can get the memory map key needed for * exit_boot_services(). */ status = efi_get_memory_map(sys_table, &memory_map, &map_size, &desc_size, &desc_ver, &mmap_key); if (status != EFI_SUCCESS) goto fail_free_new_fdt; status = update_fdt(sys_table, (void *)fdt_addr, fdt_size, (void *)*new_fdt_addr, new_fdt_size, cmdline_ptr, initrd_addr, initrd_size, memory_map, map_size, desc_size, desc_ver); /* Succeeding the first time is the expected case. */ if (status == EFI_SUCCESS) break; if (status == EFI_BUFFER_TOO_SMALL) { /* * We need to allocate more space for the new * device tree, so free existing buffer that is * too small. Also free memory map, as we will need * to get new one that reflects the free/alloc we do * on the device tree buffer. */ efi_free(sys_table, new_fdt_size, *new_fdt_addr); sys_table->boottime->free_pool(memory_map); new_fdt_size += EFI_PAGE_SIZE; } else { pr_efi_err(sys_table, "Unable to constuct new device tree.\n"); goto fail_free_mmap; } } /* Now we are ready to exit_boot_services.*/ status = sys_table->boottime->exit_boot_services(handle, mmap_key); if (status == EFI_SUCCESS) return status; pr_efi_err(sys_table, "Exit boot services failed.\n"); fail_free_mmap: sys_table->boottime->free_pool(memory_map); fail_free_new_fdt: efi_free(sys_table, new_fdt_size, *new_fdt_addr); fail: return EFI_LOAD_ERROR; }
efi_status_t handle_kernel_image(efi_system_table_t *sys_table, unsigned long *image_addr, unsigned long *image_size, unsigned long *reserve_addr, unsigned long *reserve_size, unsigned long dram_base, efi_loaded_image_t *image) { unsigned long nr_pages; efi_status_t status; /* Use alloc_addr to tranlsate between types */ efi_physical_addr_t alloc_addr; /* * Verify that the DRAM base address is compatible with the ARM * boot protocol, which determines the base of DRAM by masking * off the low 27 bits of the address at which the zImage is * loaded. These assumptions are made by the decompressor, * before any memory map is available. */ dram_base = round_up(dram_base, SZ_128M); /* * Reserve memory for the uncompressed kernel image. This is * all that prevents any future allocations from conflicting * with the kernel. Since we can't tell from the compressed * image how much DRAM the kernel actually uses (due to BSS * size uncertainty) we allocate the maximum possible size. * Do this very early, as prints can cause memory allocations * that may conflict with this. */ alloc_addr = dram_base; *reserve_size = MAX_UNCOMP_KERNEL_SIZE; nr_pages = round_up(*reserve_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; status = sys_table->boottime->allocate_pages(EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA, nr_pages, &alloc_addr); if (status != EFI_SUCCESS) { *reserve_size = 0; pr_efi_err(sys_table, "Unable to allocate memory for uncompressed kernel.\n"); return status; } *reserve_addr = alloc_addr; /* * Relocate the zImage, so that it appears in the lowest 128 MB * memory window. */ *image_size = image->image_size; status = efi_relocate_kernel(sys_table, image_addr, *image_size, *image_size, dram_base + MAX_UNCOMP_KERNEL_SIZE, 0); if (status != EFI_SUCCESS) { pr_efi_err(sys_table, "Failed to relocate kernel.\n"); efi_free(sys_table, *reserve_size, *reserve_addr); *reserve_size = 0; return status; } /* * Check to see if we were able to allocate memory low enough * in memory. The kernel determines the base of DRAM from the * address at which the zImage is loaded. */ if (*image_addr + *image_size > dram_base + ZIMAGE_OFFSET_LIMIT) { pr_efi_err(sys_table, "Failed to relocate kernel, no low memory available.\n"); efi_free(sys_table, *reserve_size, *reserve_addr); *reserve_size = 0; efi_free(sys_table, *image_size, *image_addr); *image_size = 0; return EFI_LOAD_ERROR; } return EFI_SUCCESS; }