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