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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * (C) Copyright 2017 NVIDIA Corporation <www.nvidia.com>
- *
- * Derived from Linux kernel v4.14 files:
- *
- * arch/arm64/include/asm/assembler.h:
- * Based on arch/arm/include/asm/assembler.h, arch/arm/mm/proc-macros.S
- * Copyright (C) 1996-2000 Russell King
- * Copyright (C) 2012 ARM Ltd.
- *
- * arch/arm64/kernel/head.S:
- * Based on arch/arm/kernel/head.S
- * Copyright (C) 1994-2002 Russell King
- * Copyright (C) 2003-2012 ARM Ltd.
- * Authors: Catalin Marinas <catalin.marinas@arm.com>
- * Will Deacon <will.deacon@arm.com>
- *
- * arch/arm64/kernel/image.h:
- * Copyright (C) 2014 ARM Ltd.
- */
- /*
- * There aren't any ELF relocations we can use to endian-swap values known only
- * at link time (e.g. the subtraction of two symbol addresses), so we must get
- * the linker to endian-swap certain values before emitting them.
- *
- * Note that, in order for this to work when building the ELF64 PIE executable
- * (for KASLR), these values should not be referenced via R_AARCH64_ABS64
- * relocations, since these are fixed up at runtime rather than at build time
- * when PIE is in effect. So we need to split them up in 32-bit high and low
- * words.
- */
- #ifdef CONFIG_CPU_BIG_ENDIAN
- #define DATA_LE32(data) \
- ((((data) & 0x000000ff) << 24) | \
- (((data) & 0x0000ff00) << 8) | \
- (((data) & 0x00ff0000) >> 8) | \
- (((data) & 0xff000000) >> 24))
- #else
- #define DATA_LE32(data) ((data) & 0xffffffff)
- #endif
- #define DEFINE_IMAGE_LE64(sym, data) \
- sym##_lo32 = DATA_LE32((data) & 0xffffffff); \
- sym##_hi32 = DATA_LE32((data) >> 32)
- #define __MAX(a, b) (((a) > (b)) ? (a) : (b))
- #define __CODE_DATA_SIZE (__bss_start - _start)
- #define __BSS_SIZE (__bss_end - __bss_start)
- #ifdef CONFIG_INIT_SP_RELATIVE
- #define __MAX_EXTRA_RAM_USAGE __MAX(__BSS_SIZE, CONFIG_SYS_INIT_SP_BSS_OFFSET)
- #else
- #define __MAX_EXTRA_RAM_USAGE __BSS_SIZE
- #endif
- #define __MEM_USAGE (__CODE_DATA_SIZE + __MAX_EXTRA_RAM_USAGE)
- #ifdef CONFIG_CPU_BIG_ENDIAN
- #define __HEAD_FLAG_BE 1
- #else
- #define __HEAD_FLAG_BE 0
- #endif
- #define __HEAD_FLAG_PAGE_SIZE 1 /* 4K hard-coded */
- #define __HEAD_FLAG_PHYS_BASE 1
- #define __HEAD_FLAGS ((__HEAD_FLAG_BE << 0) | \
- (__HEAD_FLAG_PAGE_SIZE << 1) | \
- (__HEAD_FLAG_PHYS_BASE << 3))
- #define TEXT_OFFSET (CONFIG_SYS_TEXT_BASE - \
- CONFIG_LNX_KRNL_IMG_TEXT_OFFSET_BASE)
- /*
- * These will output as part of the Image header, which should be little-endian
- * regardless of the endianness of the kernel. While constant values could be
- * endian swapped in head.S, all are done here for consistency.
- */
- #define HEAD_SYMBOLS \
- DEFINE_IMAGE_LE64(_kernel_size_le, __MEM_USAGE); \
- DEFINE_IMAGE_LE64(_kernel_offset_le, TEXT_OFFSET); \
- DEFINE_IMAGE_LE64(_kernel_flags_le, __HEAD_FLAGS);
- HEAD_SYMBOLS
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