1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2013, 2014 Linaro Ltd; <roy.franz@linaro.org> 4 * 5 * This file implements the EFI boot stub for the arm64 kernel. 6 * Adapted from ARM version by Mark Salter <msalter@redhat.com> 7 */ 8 9 10 #include <linux/efi.h> 11 #include <asm/efi.h> 12 #include <asm/memory.h> 13 #include <asm/sections.h> 14 15 #include "efistub.h" 16 17 efi_status_t handle_kernel_image(unsigned long *image_addr, 18 unsigned long *image_size, 19 unsigned long *reserve_addr, 20 unsigned long *reserve_size, 21 efi_loaded_image_t *image, 22 efi_handle_t image_handle) 23 { 24 unsigned long kernel_size, kernel_codesize, kernel_memsize; 25 26 if (image->image_base != _text) { 27 efi_err("FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value\n"); 28 image->image_base = _text; 29 } 30 31 if (!IS_ALIGNED((u64)_text, SEGMENT_ALIGN)) 32 efi_err("FIRMWARE BUG: kernel image not aligned on %dk boundary\n", 33 SEGMENT_ALIGN >> 10); 34 35 kernel_size = _edata - _text; 36 kernel_codesize = __inittext_end - _text; 37 kernel_memsize = kernel_size + (_end - _edata); 38 *reserve_size = kernel_memsize; 39 *image_addr = (unsigned long)_text; 40 41 return efi_kaslr_relocate_kernel(image_addr, reserve_addr, reserve_size, 42 kernel_size, kernel_codesize, kernel_memsize, 43 efi_kaslr_get_phys_seed(image_handle)); 44 } 45 46 asmlinkage void primary_entry(void); 47 48 unsigned long primary_entry_offset(void) 49 { 50 /* 51 * When built as part of the kernel, the EFI stub cannot branch to the 52 * kernel proper via the image header, as the PE/COFF header is 53 * strictly not part of the in-memory presentation of the image, only 54 * of the file representation. So instead, we need to jump to the 55 * actual entrypoint in the .text region of the image. 56 */ 57 return (char *)primary_entry - _text; 58 } 59 60 void efi_icache_sync(unsigned long start, unsigned long end) 61 { 62 caches_clean_inval_pou(start, end); 63 } 64