arch/x86/include/asm/bootparam.h

#ifndef _ASM_X86_BOOTPARAM_H
#define _ASM_X86_BOOTPARAM_H

#include <linux/types.h>
#include <linux/screen_info.h>
#include <linux/apm_bios.h>
#include <linux/edd.h>
#include <asm/e820.h>
#include <asm/ist.h>
#include <asm/video/edid.h>

/* setup_data/setup_indirect types */
#define SETUP_NONE			0
#define SETUP_E820_EXT			1
#define SETUP_DTB			2
#define SETUP_PCI			3
#define SETUP_EFI			4
#define SETUP_APPLE_PROPERTIES		5
#define SETUP_JAILHOUSE			6
#define SETUP_CC_BLOB			7
#define SETUP_IMA			8
#define SETUP_RNG_SEED			9
#define SETUP_ENUM_MAX			SETUP_RNG_SEED

#define SETUP_INDIRECT			BIT(31)
#define SETUP_TYPE_MAX			(SETUP_ENUM_MAX | SETUP_INDIRECT)

/* ram_size flags */
#define RAMDISK_IMAGE_START_MASK	0x07FF
#define RAMDISK_PROMPT_FLAG		0x8000
#define RAMDISK_LOAD_FLAG		0x4000

/* loadflags */
#define LOADED_HIGH	BIT(0)
#define KASLR_FLAG	BIT(1)
#define QUIET_FLAG	BIT(5)
#define KEEP_SEGMENTS	BIT(6)
#define CAN_USE_HEAP	BIT(7)

#define XLF_KERNEL_64			BIT(0)
#define XLF_CAN_BE_LOADED_ABOVE_4G	BIT(1)
#define XLF_EFI_HANDOVER_32		BIT(2)
#define XLF_EFI_HANDOVER_64		BIT(3)
#define XLF_EFI_KEXEC			BIT(4)

/* extensible setup data list node */
struct setup_data {
	__u64 next;
	__u32 type;
	__u32 len;
	__u8 data[];
};

/* extensible setup indirect data node */
struct setup_indirect {
	__u32 type;
	__u32 reserved;  /* Reserved, must be set to zero. */
	__u64 len;
	__u64 addr;
};

/**
 * struct setup_header - Information needed by Linux to boot
 *
 * See https://www.kernel.org/doc/html/latest/arch/x86/boot.html
 */
struct setup_header {
	__u8	setup_sects;
	__u16	root_flags;
	__u32	syssize;
	__u16	ram_size;
	__u16	vid_mode;
	__u16	root_dev;
	__u16	boot_flag;
	__u16	jump;
	__u32	header;
	__u16	version;
	__u32	realmode_swtch;
	__u16	start_sys_seg;
	__u16	kernel_version;
	__u8	type_of_loader;
	__u8	loadflags;
	__u16	setup_move_size;
	__u32	code32_start;
	__u32	ramdisk_image;
	__u32	ramdisk_size;
	__u32	bootsect_kludge;	/* Obsolete */
	__u16	heap_end_ptr;
	__u8	ext_loader_ver;
	__u8	ext_loader_type;
	__u32	cmd_line_ptr;
	__u32	initrd_addr_max;
	__u32	kernel_alignment;
	__u8	relocatable_kernel;
	__u8	min_alignment;
	__u16	xloadflags;
	__u32	cmdline_size;
	__u32	hardware_subarch;
	__u64	hardware_subarch_data;
	__u32	payload_offset;
	__u32	payload_length;
	__u64	setup_data;
	__u64	pref_address;
	__u32	init_size;
	__u32	handover_offset;
	__u32	kernel_info_offset;
} __attribute__((packed));

struct sys_desc_table {
	__u16 length;
	__u8  table[14];
};

struct efi_info {
	__u32 efi_loader_signature;
	__u32 efi_systab;
	__u32 efi_memdesc_size;
	__u32 efi_memdesc_version;
	__u32 efi_memmap;
	__u32 efi_memmap_size;
	__u32 efi_systab_hi;
	__u32 efi_memmap_hi;
};

/* The so-called "zeropage" */
struct boot_params {
	struct screen_info screen_info;			/* 0x000 */
	struct apm_bios_info apm_bios_info;		/* 0x040 */
	__u8  _pad2[4];					/* 0x054 */
	__u64  tboot_addr;				/* 0x058 */
	struct ist_info ist_info;			/* 0x060 */
	__u64 acpi_rsdp_addr;				/* 0x070 */
	__u8  _pad3[8];					/* 0x078 */
	__u8  hd0_info[16];	/* obsolete! */		/* 0x080 */
	__u8  hd1_info[16];	/* obsolete! */		/* 0x090 */
	struct sys_desc_table sys_desc_table;		/* 0x0a0 */
	__u8  _pad4[144];				/* 0x0b0 */
	struct edid_info edid_info;			/* 0x140 */
	struct efi_info efi_info;			/* 0x1c0 */
	__u32 alt_mem_k;				/* 0x1e0 */
	__u32 scratch;		/* Scratch field! */	/* 0x1e4 */
	__u8  e820_entries;				/* 0x1e8 */
	__u8  eddbuf_entries;				/* 0x1e9 */
	__u8  edd_mbr_sig_buf_entries;			/* 0x1ea */
	__u8  _pad6[6];					/* 0x1eb */
	struct setup_header hdr;    /* setup header */	/* 0x1f1 */
	__u8  _pad7[0x290-0x1f1-sizeof(struct setup_header)];
	__u32 edd_mbr_sig_buffer[EDD_MBR_SIG_MAX];	/* 0x290 */
	struct e820_entry e820_map[E820MAX];		/* 0x2d0 */
	__u8  _pad8[48];				/* 0xcd0 */
	struct edd_info eddbuf[EDDMAXNR];		/* 0xd00 */
	__u8  _pad9[276];				/* 0xeec */
} __attribute__((packed));

enum {
	X86_SUBARCH_PC = 0,
	X86_SUBARCH_LGUEST,
	X86_SUBARCH_XEN,
	X86_SUBARCH_INTEL_MID,
	X86_SUBARCH_CE4100,
	X86_NR_SUBARCHS,
};
#endif /* _ASM_X86_BOOTPARAM_H */