setup.h

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/*
 *  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/arm/Setup
 *  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 */