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Diffstat (limited to 'roms/ipxe/src/arch/i386/include/bzimage.h')
| -rw-r--r-- | roms/ipxe/src/arch/i386/include/bzimage.h | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/roms/ipxe/src/arch/i386/include/bzimage.h b/roms/ipxe/src/arch/i386/include/bzimage.h new file mode 100644 index 00000000..7e42e318 --- /dev/null +++ b/roms/ipxe/src/arch/i386/include/bzimage.h @@ -0,0 +1,142 @@ +#ifndef _BZIMAGE_H +#define _BZIMAGE_H + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include <stdint.h> + +/** + * A bzImage header + * + * As documented in Documentation/i386/boot.txt + */ +struct bzimage_header { + /** The size of the setup in sectors + * + * If this field contains 0, assume it contains 4. + */ + uint8_t setup_sects; + /** If set, the root is mounted readonly */ + uint16_t root_flags; + /** DO NOT USE - for bootsect.S use only */ + uint16_t syssize; + /** DO NOT USE - obsolete */ + uint16_t swap_dev; + /** DO NOT USE - for bootsect.S use only */ + uint16_t ram_size; + /** Video mode control */ + uint16_t vid_mode; + /** Default root device number */ + uint16_t root_dev; + /** 0xAA55 magic number */ + uint16_t boot_flag; + /** Jump instruction */ + uint16_t jump; + /** Magic signature "HdrS" */ + uint32_t header; + /** Boot protocol version supported */ + uint16_t version; + /** Boot loader hook (see below) */ + uint32_t realmode_swtch; + /** The load-low segment (0x1000) (obsolete) */ + uint16_t start_sys; + /** Pointer to kernel version string */ + uint16_t kernel_version; + /** Boot loader identifier */ + uint8_t type_of_loader; + /** Boot protocol option flags */ + uint8_t loadflags; + /** Move to high memory size (used with hooks) */ + uint16_t setup_move_size; + /** Boot loader hook (see below) */ + uint32_t code32_start; + /** initrd load address (set by boot loader) */ + uint32_t ramdisk_image; + /** initrd size (set by boot loader) */ + uint32_t ramdisk_size; + /** DO NOT USE - for bootsect.S use only */ + uint32_t bootsect_kludge; + /** Free memory after setup end */ + uint16_t heap_end_ptr; + /** Unused */ + uint16_t pad1; + /** 32-bit pointer to the kernel command line */ + uint32_t cmd_line_ptr; + /** Highest legal initrd address */ + uint32_t initrd_addr_max; + /** Physical addr alignment required for kernel */ + uint32_t kernel_alignment; + /** Whether kernel is relocatable or not */ + uint8_t relocatable_kernel; + /** Unused */ + uint8_t pad2[3]; + /** Maximum size of the kernel command line */ + uint32_t cmdline_size; +} __attribute__ (( packed )); + +/** Offset of bzImage header within kernel image */ +#define BZI_HDR_OFFSET 0x1f1 + +/** bzImage boot flag value */ +#define BZI_BOOT_FLAG 0xaa55 + +/** bzImage magic signature value */ +#define BZI_SIGNATURE 0x53726448 + +/** bzImage boot loader identifier for Etherboot */ +#define BZI_LOADER_TYPE_ETHERBOOT 0x40 + +/** bzImage boot loader identifier for iPXE + * + * We advertise ourselves as Etherboot version 6. + */ +#define BZI_LOADER_TYPE_IPXE ( BZI_LOADER_TYPE_ETHERBOOT | 0x06 ) + +/** bzImage "load high" flag */ +#define BZI_LOAD_HIGH 0x01 + +/** Load address for high-loaded kernels */ +#define BZI_LOAD_HIGH_ADDR 0x100000 + +/** Load address for low-loaded kernels */ +#define BZI_LOAD_LOW_ADDR 0x10000 + +/** bzImage "kernel can use heap" flag */ +#define BZI_CAN_USE_HEAP 0x80 + +/** bzImage special video mode "normal" */ +#define BZI_VID_MODE_NORMAL 0xffff + +/** bzImage special video mode "ext" */ +#define BZI_VID_MODE_EXT 0xfffe + +/** bzImage special video mode "ask" */ +#define BZI_VID_MODE_ASK 0xfffd + +/** bzImage maximum initrd address for versions < 2.03 */ +#define BZI_INITRD_MAX 0x37ffffff + +/** bzImage command-line structure used by older kernels */ +struct bzimage_cmdline { + /** Magic signature */ + uint16_t magic; + /** Offset to command line */ + uint16_t offset; +} __attribute__ (( packed )); + +/** Offset of bzImage command-line structure within kernel image */ +#define BZI_CMDLINE_OFFSET 0x20 + +/** bzImage command line present magic marker value */ +#define BZI_CMDLINE_MAGIC 0xa33f + +/** Assumed size of real-mode portion (including .bss) */ +#define BZI_ASSUMED_RM_SIZE 0x8000 + +/** Amount of stack space to provide */ +#define BZI_STACK_SIZE 0x1000 + +/** Maximum size of command line */ +#define BZI_CMDLINE_SIZE 0x7ff + +#endif /* _BZIMAGE_H */ |