1 /* SPDX-License-Identifier: GPL-2.0 */
3 * (C) Copyright 2017 NVIDIA Corporation <www.nvidia.com>
5 * Derived from Linux kernel v4.14 files:
7 * arch/arm64/include/asm/assembler.h:
8 * Based on arch/arm/include/asm/assembler.h, arch/arm/mm/proc-macros.S
9 * Copyright (C) 1996-2000 Russell King
10 * Copyright (C) 2012 ARM Ltd.
12 * arch/arm64/kernel/head.S:
13 * Based on arch/arm/kernel/head.S
14 * Copyright (C) 1994-2002 Russell King
15 * Copyright (C) 2003-2012 ARM Ltd.
16 * Authors: Catalin Marinas <catalin.marinas@arm.com>
17 * Will Deacon <will.deacon@arm.com>
19 * arch/arm64/kernel/image.h:
20 * Copyright (C) 2014 ARM Ltd.
24 * There aren't any ELF relocations we can use to endian-swap values known only
25 * at link time (e.g. the subtraction of two symbol addresses), so we must get
26 * the linker to endian-swap certain values before emitting them.
28 * Note that, in order for this to work when building the ELF64 PIE executable
29 * (for KASLR), these values should not be referenced via R_AARCH64_ABS64
30 * relocations, since these are fixed up at runtime rather than at build time
31 * when PIE is in effect. So we need to split them up in 32-bit high and low
34 #ifdef CONFIG_CPU_BIG_ENDIAN
35 #define DATA_LE32(data) \
36 ((((data) & 0x000000ff) << 24) | \
37 (((data) & 0x0000ff00) << 8) | \
38 (((data) & 0x00ff0000) >> 8) | \
39 (((data) & 0xff000000) >> 24))
41 #define DATA_LE32(data) ((data) & 0xffffffff)
44 #define DEFINE_IMAGE_LE64(sym, data) \
45 sym##_lo32 = DATA_LE32((data) & 0xffffffff); \
46 sym##_hi32 = DATA_LE32((data) >> 32)
48 #define __MAX(a, b) (((a) > (b)) ? (a) : (b))
49 #define __CODE_DATA_SIZE (__bss_start - _start)
50 #define __BSS_SIZE (__bss_end - __bss_start)
51 #ifdef CONFIG_INIT_SP_RELATIVE
52 #define __MAX_EXTRA_RAM_USAGE __MAX(__BSS_SIZE, CONFIG_SYS_INIT_SP_BSS_OFFSET)
54 #define __MAX_EXTRA_RAM_USAGE __BSS_SIZE
56 #define __MEM_USAGE (__CODE_DATA_SIZE + __MAX_EXTRA_RAM_USAGE)
58 #ifdef CONFIG_CPU_BIG_ENDIAN
59 #define __HEAD_FLAG_BE 1
61 #define __HEAD_FLAG_BE 0
64 #define __HEAD_FLAG_PAGE_SIZE 1 /* 4K hard-coded */
66 #define __HEAD_FLAG_PHYS_BASE 1
68 #define __HEAD_FLAGS ((__HEAD_FLAG_BE << 0) | \
69 (__HEAD_FLAG_PAGE_SIZE << 1) | \
70 (__HEAD_FLAG_PHYS_BASE << 3))
72 #define TEXT_OFFSET (CONFIG_SYS_TEXT_BASE - \
73 CONFIG_LNX_KRNL_IMG_TEXT_OFFSET_BASE)
76 * These will output as part of the Image header, which should be little-endian
77 * regardless of the endianness of the kernel. While constant values could be
78 * endian swapped in head.S, all are done here for consistency.
80 #define HEAD_SYMBOLS \
81 DEFINE_IMAGE_LE64(_kernel_size_le, __MEM_USAGE); \
82 DEFINE_IMAGE_LE64(_kernel_offset_le, TEXT_OFFSET); \
83 DEFINE_IMAGE_LE64(_kernel_flags_le, __HEAD_FLAGS);