143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
#ifndef _BZIMAGE_H
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#define _BZIMAGE_H
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FILE_LICENCE ( GPL2_OR_LATER );
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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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/** Physical addr alignment required for kernel */
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uint32_t kernel_alignment;
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/** Whether kernel is relocatable or not */
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uint8_t relocatable_kernel;
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/** Unused */
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uint8_t pad2[3];
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/** Maximum size of the kernel command line */
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uint32_t cmdline_size;
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} __attribute__ (( packed ));
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/** Offset of bzImage header within kernel image */
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#define BZI_HDR_OFFSET 0x1f1
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/** bzImage boot flag value */
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#define BZI_BOOT_FLAG 0xaa55
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/** bzImage magic signature value */
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#define BZI_SIGNATURE 0x53726448
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/** bzImage boot loader identifier for Etherboot */
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#define BZI_LOADER_TYPE_ETHERBOOT 0x40
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/** bzImage boot loader identifier for iPXE
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*
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* We advertise ourselves as Etherboot version 6.
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*/
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#define BZI_LOADER_TYPE_IPXE ( BZI_LOADER_TYPE_ETHERBOOT | 0x06 )
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/** bzImage "load high" flag */
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#define BZI_LOAD_HIGH 0x01
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/** Load address for high-loaded kernels */
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#define BZI_LOAD_HIGH_ADDR 0x100000
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/** Load address for low-loaded kernels */
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#define BZI_LOAD_LOW_ADDR 0x10000
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/** bzImage "kernel can use heap" flag */
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#define BZI_CAN_USE_HEAP 0x80
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/** bzImage special video mode "normal" */
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#define BZI_VID_MODE_NORMAL 0xffff
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/** bzImage special video mode "ext" */
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#define BZI_VID_MODE_EXT 0xfffe
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/** bzImage special video mode "ask" */
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#define BZI_VID_MODE_ASK 0xfffd
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/** bzImage maximum initrd address for versions < 2.03 */
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#define BZI_INITRD_MAX 0x37ffffff
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/** bzImage command-line structure used by older kernels */
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struct bzimage_cmdline {
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/** Magic signature */
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uint16_t magic;
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/** Offset to command line */
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uint16_t offset;
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} __attribute__ (( packed ));
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/** Offset of bzImage command-line structure within kernel image */
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#define BZI_CMDLINE_OFFSET 0x20
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/** bzImage command line present magic marker value */
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#define BZI_CMDLINE_MAGIC 0xa33f
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/** Assumed size of real-mode portion (including .bss) */
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#define BZI_ASSUMED_RM_SIZE 0x8000
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/** Amount of stack space to provide */
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#define BZI_STACK_SIZE 0x1000
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/** Maximum size of command line */
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#define BZI_CMDLINE_SIZE 0x100
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#endif /* _BZIMAGE_H */
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