projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 3c7f2550 MS |
1 | /* |
| 2 | * Copyright (C) 2013, 2014 Linaro Ltd; <roy.franz@linaro.org> | |
| 3 | * | |
| 4 | * This file implements the EFI boot stub for the arm64 kernel. | |
| 5 | * Adapted from ARM version by Mark Salter <msalter@redhat.com> | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | * | |
| 11 | */ | |
| 12 | #include <linux/efi.h> | |
| 13 | #include <linux/libfdt.h> | |
| 14 | #include <asm/sections.h> | |
| 15 | #include <generated/compile.h> | |
| 16 | #include <generated/utsrelease.h> | |
| 17 | ||
| 18 | /* | |
| 19 | * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from | |
| 20 | * start of kernel and may not cross a 2MiB boundary. We set alignment to | |
| 21 | * 2MiB so we know it won't cross a 2MiB boundary. | |
| 22 | */ | |
| 23 | #define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */ | |
| 24 | #define MAX_FDT_OFFSET SZ_512M | |
| 25 | ||
| 26 | #define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__) | |
| 27 | ||
| 28 | static void efi_char16_printk(efi_system_table_t *sys_table_arg, | |
| 29 | efi_char16_t *str); | |
| 30 | ||
| 31 | static efi_status_t efi_open_volume(efi_system_table_t *sys_table, | |
| 32 | void *__image, void **__fh); | |
| 33 | static efi_status_t efi_file_close(void *handle); | |
| 34 | ||
| 35 | static efi_status_t | |
| 36 | efi_file_read(void *handle, unsigned long *size, void *addr); | |
| 37 | ||
| 38 | static efi_status_t | |
| 39 | efi_file_size(efi_system_table_t *sys_table, void *__fh, | |
| 40 | efi_char16_t *filename_16, void **handle, u64 *file_sz); | |
| 41 | ||
| 42 | /* Include shared EFI stub code */ | |
| 43 | #include "../../../drivers/firmware/efi/efi-stub-helper.c" | |
| 44 | #include "../../../drivers/firmware/efi/fdt.c" | |
| 45 | #include "../../../drivers/firmware/efi/arm-stub.c" | |
| 46 | ||
| 47 | ||
| 48 | static efi_status_t handle_kernel_image(efi_system_table_t *sys_table, | |
| 49 | unsigned long *image_addr, | |
| 50 | unsigned long *image_size, | |
| 51 | unsigned long *reserve_addr, | |
| 52 | unsigned long *reserve_size, | |
| 53 | unsigned long dram_base, | |
| 54 | efi_loaded_image_t *image) | |
| 55 | { | |
| 56 | efi_status_t status; | |
| 57 | unsigned long kernel_size, kernel_memsize = 0; | |
| 58 | ||
| 59 | /* Relocate the image, if required. */ | |
| 60 | kernel_size = _edata - _text; | |
| 61 | if (*image_addr != (dram_base + TEXT_OFFSET)) { | |
| 62 | kernel_memsize = kernel_size + (_end - _edata); | |
| 63 | status = efi_relocate_kernel(sys_table, image_addr, | |
| 64 | kernel_size, kernel_memsize, | |
| 65 | dram_base + TEXT_OFFSET, | |
| 66 | PAGE_SIZE); | |
| 67 | if (status != EFI_SUCCESS) { | |
| 68 | pr_efi_err(sys_table, "Failed to relocate kernel\n"); | |
| 69 | return status; | |
| 70 | } | |
| 71 | if (*image_addr != (dram_base + TEXT_OFFSET)) { | |
| 72 | pr_efi_err(sys_table, "Failed to alloc kernel memory\n"); | |
| 73 | efi_free(sys_table, kernel_memsize, *image_addr); | |
| 74 | return EFI_ERROR; | |
| 75 | } | |
| 76 | *image_size = kernel_memsize; | |
| 77 | } | |
| 78 | ||
| 79 | ||
| 80 | return EFI_SUCCESS; | |
| 81 | } |