/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 *  linux/include/asm/setup.h
 *
 *  Copyright (C) 1997-1999 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Structure passed to kernel to tell it about the
 *  hardware it's running on.  See Documentation/arch/arm/setup.rst
 *  for more info.
 */
#ifndef _UAPI__ASMARM_SETUP_H
#define _UAPI__ASMARM_SETUP_H

#include <linux/types.h>

#define COMMAND_LINE_SIZE 1024

/* The list ends with an ATAG_NONE node. */
#define ATAG_NONE       0x00000000

struct tag_header {
        __u32 size;
        __u32 tag;
};

/* The list must start with an ATAG_CORE node */
#define ATAG_CORE       0x54410001

struct tag_core {
        __u32 flags;            /* bit 0 = read-only */
        __u32 pagesize;
        __u32 rootdev;
};

/* it is allowed to have multiple ATAG_MEM nodes */
#define ATAG_MEM        0x54410002

struct tag_mem32 {
        __u32   size;
        __u32   start;  /* physical start address */
};

/* VGA text type displays */
#define ATAG_VIDEOTEXT  0x54410003

struct tag_videotext {
        __u8            x;
        __u8            y;
        __u16           video_page;
        __u8            video_mode;
        __u8            video_cols;
        __u16           video_ega_bx;
        __u8            video_lines;
        __u8            video_isvga;
        __u16           video_points;
};

/* describes how the ramdisk will be used in kernel */
#define ATAG_RAMDISK    0x54410004

struct tag_ramdisk {
        __u32 flags;    /* bit 0 = load, bit 1 = prompt */
        __u32 size;     /* decompressed ramdisk size in _kilo_ bytes */
        __u32 start;    /* starting block of floppy-based RAM disk image */
};

/* describes where the compressed ramdisk image lives (virtual address) */
/*
 * this one accidentally used virtual addresses - as such,
 * it's deprecated.
 */
#define ATAG_INITRD     0x54410005

/* describes where the compressed ramdisk image lives (physical address) */
#define ATAG_INITRD2    0x54420005

struct tag_initrd {
        __u32 start;    /* physical start address */
        __u32 size;     /* size of compressed ramdisk image in bytes */
};

/* board serial number. "64 bits should be enough for everybody" */
#define ATAG_SERIAL     0x54410006

struct tag_serialnr {
        __u32 low;
        __u32 high;
};

/* board revision */
#define ATAG_REVISION   0x54410007

struct tag_revision {
        __u32 rev;
};

/* initial values for vesafb-type framebuffers. see struct screen_info
 * in include/linux/tty.h
 */
#define ATAG_VIDEOLFB   0x54410008

struct tag_videolfb {
        __u16           lfb_width;
        __u16           lfb_height;
        __u16           lfb_depth;
        __u16           lfb_linelength;
        __u32           lfb_base;
        __u32           lfb_size;
        __u8            red_size;
        __u8            red_pos;
        __u8            green_size;
        __u8            green_pos;
        __u8            blue_size;
        __u8            blue_pos;
        __u8            rsvd_size;
        __u8            rsvd_pos;
};

/* command line: \0 terminated string */
#define ATAG_CMDLINE    0x54410009

struct tag_cmdline {
        char    cmdline[1];     /* this is the minimum size */
};

/* acorn RiscPC specific information */
#define ATAG_ACORN      0x41000101

struct tag_acorn {
        __u32 memc_control_reg;
        __u32 vram_pages;
        __u8 sounddefault;
        __u8 adfsdrives;
};

/* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */
#define ATAG_MEMCLK     0x41000402

struct tag_memclk {
        __u32 fmemclk;
};

struct tag {
        struct tag_header hdr;
        union {
                struct tag_core         core;
                struct tag_mem32        mem;
                struct tag_videotext    videotext;
                struct tag_ramdisk      ramdisk;
                struct tag_initrd       initrd;
                struct tag_serialnr     serialnr;
                struct tag_revision     revision;
                struct tag_videolfb     videolfb;
                struct tag_cmdline      cmdline;

                /*
                 * Acorn specific
                 */
                struct tag_acorn        acorn;

                /*
                 * DC21285 specific
                 */
                struct tag_memclk       memclk;
        } u;
};

struct tagtable {
        __u32 tag;
        int (*parse)(const struct tag *);
};

#define tag_member_present(tag,member)                          \
        ((unsigned long)(&((struct tag *)0L)->member + 1)       \
                <= (tag)->hdr.size * 4)

#define tag_next(t)     ((struct tag *)((__u32 *)(t) + (t)->hdr.size))
#define tag_size(type)  ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)

#define for_each_tag(t,base)            \
        for (t = base; t->hdr.size; t = tag_next(t))


#endif /* _UAPI__ASMARM_SETUP_H */