Make struct boot_params a real structure, and remove obsolete fields

Make struct boot_params a real structure, and remove the handling of
some obsolete fields, in particular hd*_info, which was only used by
the ST-506 driver, and likely to be wrong for that driver on any
modern BIOS.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/asm-i386/bootparam.h

@@ -0,0 +1,85 @@
+#ifndef _ASM_BOOTPARAM_H
+#define _ASM_BOOTPARAM_H
+
+#include <linux/types.h>
+#include <linux/screen_info.h>
+#include <linux/apm_bios.h>
+#include <asm/e820.h>
+#include <linux/edd.h>
+#include <video/edid.h>
+
+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;
+	u16	kernel_version;
+	u8	type_of_loader;
+	u8	loadflags;
+#define LOADED_HIGH	0x01
+#define CAN_USE_HEAP	0x80
+	u16	setup_move_size;
+	u32	code32_start;
+	u32	ramdisk_image;
+	u32	ramdisk_size;
+	u32	bootsect_kludge;
+	u16	heap_end_ptr;
+	u16	_pad1;
+	u32	cmd_line_ptr;
+	u32	initrd_addr_max;
+	u32	kernel_alignment;
+	u8	relocatable_kernel;
+} __attribute__((packed));
+
+struct sys_desc_table {
+	u16 length;
+	u8  table[14];
+};
+
+struct efi_info {
+	u32 _pad1;
+	u32 efi_systab;
+	u32 efi_memdesc_size;
+	u32 efi_memdec_version;
+	u32 efi_memmap;
+	u32 fi_memmap_size;
+	u32 _pad2[2];
+};
+
+/* The so-called "zeropage" */
+struct boot_params {
+	struct screen_info screen_info;			/* 0x000 */
+	struct apm_bios_info apm_bios_info;		/* 0x040 */
+	u8  _pad2[12];					/* 0x054 */
+	u32 speedstep_info[4];				/* 0x060 */
+	u8  _pad3[16];					/* 0x070 */
+	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 e820entry e820_map[E820MAX];		/* 0x2d0 */
+	u8  _pad8[48];					/* 0xcd0 */
+	struct edd_info eddbuf[EDDMAXNR];		/* 0xd00 */
+	u8  _pad9[276];					/* 0xeec */
+} __attribute__((packed));
+
+#endif /* _ASM_BOOTPARAM_H */