calculate the stack pointer. This offset should be large enough so
that the early malloc region, global data (gd), and early stack usage
do not overlap any appended DTB.
+
+config LINUX_KERNEL_IMAGE_HEADER
+ bool
+ help
+ Place a Linux kernel image header at the start of the U-Boot binary.
+ The format of the header is described in the Linux kernel source at
+ Documentation/arm64/booting.txt. This feature is useful since the
+ image header reports the amount of memory (BSS and similar) that
+ U-Boot needs to use, but which isn't part of the binary.
+
+if LINUX_KERNEL_IMAGE_HEADER
+config LNX_KRNL_IMG_TEXT_OFFSET_BASE
+ hex
+ help
+ The value subtracted from CONFIG_SYS_TEXT_BASE to calculate the
+ TEXT_OFFSET value written in to the Linux kernel image header.
+endif
endif
config STATIC_RELA
--- /dev/null
+/*
+ * (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.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+/*
+ * 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_SYS_INIT_SP_BSS_OFFSET
+#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
--- /dev/null
+/*
+ * (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.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+ /*
+ * Emit a 64-bit absolute little endian symbol reference in a way that
+ * ensures that it will be resolved at build time, even when building a
+ * PIE binary. This requires cooperation from the linker script, which
+ * must emit the lo32/hi32 halves individually.
+ */
+ .macro le64sym, sym
+ .long \sym\()_lo32
+ .long \sym\()_hi32
+ .endm
+
+.globl _start
+_start:
+ /*
+ * DO NOT MODIFY. Image header expected by Linux boot-loaders.
+ */
+ b reset /* branch to kernel start, magic */
+ .long 0 /* reserved */
+ le64sym _kernel_offset_le /* Image load offset from start of RAM, little-endian */
+ le64sym _kernel_size_le /* Effective size of kernel image, little-endian */
+ le64sym _kernel_flags_le /* Informative flags, little-endian */
+ .quad 0 /* reserved */
+ .quad 0 /* reserved */
+ .quad 0 /* reserved */
+ .ascii "ARM\x64" /* Magic number */
+ .long 0 /* reserved */
projects / u-boot.git / commitdiff