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
17efi_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
53asmlinkage void primary_entry(void);
54
55unsigned 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
67void efi_icache_sync(unsigned long start, unsigned long end)
68{
69	caches_clean_inval_pou(start, end);
70}