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 efi_status_t status; 25 unsigned long kernel_size, kernel_codesize, kernel_memsize; 26 27 if (image->image_base != _text) { 28 efi_err("FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value\n"); 29 image->image_base = _text; 30 } 31 32 if (!IS_ALIGNED((u64)_text, SEGMENT_ALIGN)) 33 efi_err("FIRMWARE BUG: kernel image not aligned on %dk boundary\n", 34 SEGMENT_ALIGN >> 10); 35 36 kernel_size = _edata - _text; 37 kernel_codesize = __inittext_end - _text; 38 kernel_memsize = kernel_size + (_end - _edata); 39 *reserve_size = kernel_memsize; 40 *image_addr = (unsigned long)_text; 41 42 status = efi_kaslr_relocate_kernel(image_addr, 43 reserve_addr, reserve_size, 44 kernel_size, kernel_codesize, 45 kernel_memsize, 46 efi_kaslr_get_phys_seed(image_handle)); 47 if (status != EFI_SUCCESS) 48 return status; 49 50 return EFI_SUCCESS; 51 } 52 53 asmlinkage void primary_entry(void); 54 55 unsigned long primary_entry_offset(void) 56 { 57 /* 58 * When built as part of the kernel, the EFI stub cannot branch to the 59 * kernel proper via the image header, as the PE/COFF header is 60 * strictly not part of the in-memory presentation of the image, only 61 * of the file representation. So instead, we need to jump to the 62 * actual entrypoint in the .text region of the image. 63 */ 64 return (char *)primary_entry - _text; 65 } 66 67 void efi_icache_sync(unsigned long start, unsigned long end) 68 { 69 caches_clean_inval_pou(start, end); 70 } 71