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Diffstat (limited to 'kexec/arch/arm64/image-header.h')
-rw-r--r-- | kexec/arch/arm64/image-header.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/kexec/arch/arm64/image-header.h b/kexec/arch/arm64/image-header.h new file mode 100644 index 0000000..acb839a --- /dev/null +++ b/kexec/arch/arm64/image-header.h @@ -0,0 +1,95 @@ +/* + * ARM64 binary image support. + * Copyright (C) 2014 Linaro. + */ + +#if !defined(__ARM64_IMAGE_HEADER_H) +#define __ARM64_IMAGE_HEADER_H + +#if !defined(__KERNEL__) +#include <stdint.h> +#endif + +#if !defined(__ASSEMBLY__) + +/** + * struct arm64_image_header - arm64 kernel image header. + * + * @pe_sig: Optional PE format 'MZ' signature. + * @branch_code: Reserved for instructions to branch to stext. + * @text_offset: The image load offset in LSB byte order. + * @image_size: An estimated size of the memory image size in LSB byte order. + * @flags: Bit flags: + * Bit 7.0: Image byte order, 1=MSB. + * @reserved_1: Reserved. + * @magic: Magic number, "ARM\x64". + * @pe_header: Optional offset to a PE format header. + **/ + +struct arm64_image_header { + uint8_t pe_sig[2]; + uint16_t branch_code[3]; + uint64_t text_offset; + uint64_t image_size; + uint8_t flags[8]; + uint64_t reserved_1[3]; + uint8_t magic[4]; + uint32_t pe_header; +}; + +static const uint8_t arm64_image_magic[4] = {'A', 'R', 'M', 0x64U}; +static const uint8_t arm64_image_pe_sig[2] = {'M', 'Z'}; +static const uint64_t arm64_image_flag_7_be = 0x01U; + +/** + * arm64_header_check_magic - Helper to check the arm64 image header. + * + * Returns non-zero if header is OK. + */ + +static inline int arm64_header_check_magic(const struct arm64_image_header *h) +{ + if (!h) + return 0; + + if (!h->text_offset) + return 0; + + return (h->magic[0] == arm64_image_magic[0] + && h->magic[1] == arm64_image_magic[1] + && h->magic[2] == arm64_image_magic[2] + && h->magic[3] == arm64_image_magic[3]); +} + +/** + * arm64_header_check_pe_sig - Helper to check the arm64 image header. + * + * Returns non-zero if 'MZ' signature is found. + */ + +static inline int arm64_header_check_pe_sig(const struct arm64_image_header *h) +{ + if (!h) + return 0; + + return (h->pe_sig[0] == arm64_image_pe_sig[0] + && h->pe_sig[1] == arm64_image_pe_sig[1]); +} + +/** + * arm64_header_check_msb - Helper to check the arm64 image header. + * + * Returns non-zero if the image was built as big endian. + */ + +static inline int arm64_header_check_msb(const struct arm64_image_header *h) +{ + if (!h) + return 0; + + return !!(h->flags[7] & arm64_image_flag_7_be); +} + +#endif /* !defined(__ASSEMBLY__) */ + +#endif |