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最小bootloader程序之setup.h文件  

2012-08-09 18:16:59|  分类: 韦东山视频第二轮 |  标签: |举报 |字号 订阅

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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 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.
 */

 typedef signed char s8;
typedef unsigned char u8;

typedef signed short s16;
typedef unsigned short u16;

typedef signed int s32;
typedef unsigned int u32;

typedef signed long long s64;
typedef unsigned long long u64;

#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_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

直接拷贝uboot,不解释!!!

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