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setup.h

/*
 *  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 linux/Documentation/arm/Setup
 *  for more info.
 *
 * NOTE:
 *  This file contains two ways to pass information from the boot
 *  loader to the kernel. The old struct param_struct is deprecated,
 *  but it will be kept in the kernel for 5 years from now
 *  (2001). This will allow boot loaders to convert to the new struct
 *  tag way.
 */
#ifndef __ASMARM_SETUP_H
#define __ASMARM_SETUP_H

/*
 * Usage:
 *  - do not go blindly adding fields, add them at the end
 *  - when adding fields, don't rely on the address until
 *    a patch from me has been released
 *  - unused fields should be zero (for future expansion)
 *  - this structure is relatively short-lived - only
 *    guaranteed to contain useful data in setup_arch()
 */
#define COMMAND_LINE_SIZE 1024

/* This is the old deprecated way to pass parameters to the kernel */
struct param_struct {
    union {
      struct {
          unsigned long page_size;        /*  0 */
          unsigned long nr_pages;         /*  4 */
          unsigned long ramdisk_size;           /*  8 */
          unsigned long flags;            /* 12 */
#define FLAG_READONLY   1
#define FLAG_RDLOAD     4
#define FLAG_RDPROMPT   8
          unsigned long rootdev;          /* 16 */
          unsigned long video_num_cols;   /* 20 */
          unsigned long video_num_rows;   /* 24 */
          unsigned long video_x;          /* 28 */
          unsigned long video_y;          /* 32 */
          unsigned long memc_control_reg; /* 36 */
          unsigned char sounddefault;           /* 40 */
          unsigned char adfsdrives;       /* 41 */
          unsigned char bytes_per_char_h; /* 42 */
          unsigned char bytes_per_char_v; /* 43 */
          unsigned long pages_in_bank[4]; /* 44 */
          unsigned long pages_in_vram;    /* 60 */
          unsigned long initrd_start;           /* 64 */
          unsigned long initrd_size;            /* 68 */
          unsigned long rd_start;         /* 72 */
          unsigned long system_rev;       /* 76 */
          unsigned long system_serial_low;      /* 80 */
          unsigned long system_serial_high;     /* 84 */
          unsigned long mem_fclk_21285;       /* 88 */
      } s;
      char unused[256];
    } u1;
    union {
      char paths[8][128];
      struct {
          unsigned long magic;
          char n[1024 - sizeof(unsigned long)];
      } s;
    } u2;
    char commandline[COMMAND_LINE_SIZE];
};


/*
 * The new way of passing information: a list of tagged entries
 */

/* 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,
 * its depreciated.
 */
#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 __attribute__((unused, __section__(".taglist")))
#define __tagtable(tag, fn) \
static struct tagtable __tagtable_##fn __tag = { tag, fn }

#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))

/*
 * Memory map description
 */
#define NR_BANKS 8

struct meminfo {
      int nr_banks;
      unsigned long end;
      struct {
            unsigned long start;
            unsigned long size;
            int           node;
      } bank[NR_BANKS];
};

extern struct meminfo meminfo;

#endif

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