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Diffstat (limited to 'arch/arm64/kernel/image.h')
-rw-r--r-- | arch/arm64/kernel/image.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/arch/arm64/kernel/image.h b/arch/arm64/kernel/image.h new file mode 100644 index 0000000..8fae075 --- /dev/null +++ b/arch/arm64/kernel/image.h @@ -0,0 +1,62 @@ +/* + * Linker script macros to generate Image header fields. + * + * Copyright (C) 2014 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#ifndef __ASM_IMAGE_H +#define __ASM_IMAGE_H + +#ifndef LINKER_SCRIPT +#error This file should only be included in vmlinux.lds.S +#endif + +/* + * 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. + */ +#ifdef CONFIG_CPU_BIG_ENDIAN +#define DATA_LE64(data) \ + ((((data) & 0x00000000000000ff) << 56) | \ + (((data) & 0x000000000000ff00) << 40) | \ + (((data) & 0x0000000000ff0000) << 24) | \ + (((data) & 0x00000000ff000000) << 8) | \ + (((data) & 0x000000ff00000000) >> 8) | \ + (((data) & 0x0000ff0000000000) >> 24) | \ + (((data) & 0x00ff000000000000) >> 40) | \ + (((data) & 0xff00000000000000) >> 56)) +#else +#define DATA_LE64(data) ((data) & 0xffffffffffffffff) +#endif + +#ifdef CONFIG_CPU_BIG_ENDIAN +#define __HEAD_FLAG_BE 1 +#else +#define __HEAD_FLAG_BE 0 +#endif + +#define __HEAD_FLAGS (__HEAD_FLAG_BE << 0) + +/* + * 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 \ + _kernel_size_le = DATA_LE64(_end - _text); \ + _kernel_offset_le = DATA_LE64(TEXT_OFFSET); \ + _kernel_flags_le = DATA_LE64(__HEAD_FLAGS); + +#endif /* __ASM_IMAGE_H */ |