mirror of
https://github.com/ipxe/ipxe
synced 2025-12-26 17:42:47 +03:00
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
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#ifndef _BZIMAGE_H
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#define _BZIMAGE_H
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#include <stdint.h>
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/**
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* A bzImage header
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*
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* As documented in Documentation/i386/boot.txt
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*/
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struct bzimage_header {
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/** The size of the setup in sectors
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*
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* If this field contains 0, assume it contains 4.
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*/
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uint8_t setup_sects;
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/** If set, the root is mounted readonly */
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uint16_t root_flags;
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/** DO NOT USE - for bootsect.S use only */
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uint16_t syssize;
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/** DO NOT USE - obsolete */
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uint16_t swap_dev;
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/** DO NOT USE - for bootsect.S use only */
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uint16_t ram_size;
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/** Video mode control */
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uint16_t vid_mode;
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/** Default root device number */
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uint16_t root_dev;
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/** 0xAA55 magic number */
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uint16_t boot_flag;
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/** Jump instruction */
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uint16_t jump;
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/** Magic signature "HdrS" */
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uint32_t header;
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/** Boot protocol version supported */
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uint16_t version;
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/** Boot loader hook (see below) */
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uint32_t realmode_swtch;
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/** The load-low segment (0x1000) (obsolete) */
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uint16_t start_sys;
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/** Pointer to kernel version string */
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uint16_t kernel_version;
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/** Boot loader identifier */
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uint8_t type_of_loader;
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/** Boot protocol option flags */
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uint8_t loadflags;
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/** Move to high memory size (used with hooks) */
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uint16_t setup_move_size;
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/** Boot loader hook (see below) */
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uint32_t code32_start;
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/** initrd load address (set by boot loader) */
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uint32_t ramdisk_image;
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/** initrd size (set by boot loader) */
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uint32_t ramdisk_size;
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/** DO NOT USE - for bootsect.S use only */
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uint32_t bootsect_kludge;
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/** Free memory after setup end */
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uint16_t heap_end_ptr;
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/** Unused */
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uint16_t pad1;
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/** 32-bit pointer to the kernel command line */
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uint32_t cmd_line_ptr;
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/** Highest legal initrd address */
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uint32_t initrd_addr_max;
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} __attribute__ (( packed ));
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/** Offset of bzImage header within kernel image */
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#define BZHDR_OFFSET 0x1f1
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/** bzImage magic signature value */
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#define BZIMAGE_SIGNATURE 0x53726448
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#endif /* _BZIMAGE_H */
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