arch/arm/include/asm/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 */
};

#define ATAG_MEM64      0x54420002

struct tag_mem64 {
	__u64 size;
	__u64 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;
};

#if defined (CONFIG_MARVELL_TAG)
/* Marvell uboot parameters */
#define ATAG_MV_UBOOT           0x41000403
#define MV_UBOOT_MAX_PORTS      4
struct tag_mv_uboot {
	u32 uboot_version;
	u32 tclk;
	u32 sysclk;
	u32 isUsbHost;
	char macAddr[MV_UBOOT_MAX_PORTS][6];
	u16 mtu[MV_UBOOT_MAX_PORTS];
	u32 nand_ecc;
	u32 board_module_config;
};
#endif

struct tag {
	struct tag_header hdr;
	union {
		struct tag_core core;
		struct tag_mem32 mem;
		struct tag_mem64 mem64;
		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;
#if defined (CONFIG_MARVELL_TAG)
		/*
		 * Marvell specific
		 */
		struct tag_mv_uboot mv_uboot;
#endif
	} 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

/*
 * Board specified tags
 */
void setup_board_tags(struct tag **in_params);