global_data.h

uboot详细解读可用启动引导LINUX2.6内核

/*
 * (C) Copyright 2002
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * (C) Copyright 2007
 * Daniel Hellstrom, Gaisler Research, [e-mail].
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#ifndef	__ASM_GBL_DATA_H
#define __ASM_GBL_DATA_H

#include "asm/types.h"

/*
 * The following data structure is placed in some memory wich is
 * available very early after boot (like DPRAM on MPC8xx/MPC82xx, or
 * some locked parts of the data cache) to allow for a minimum set of
 * global variables during system initialization (until we have set
 * up the memory controller so that we can use RAM).
 *
 * Keep it *SMALL* and remember to set CFG_GBL_DATA_SIZE > sizeof(gd_t)
 */

typedef struct global_data {
	bd_t *bd;
	unsigned long flags;
	unsigned long baudrate;
	unsigned long cpu_clk;	/* CPU clock in Hz!             */
	unsigned long bus_clk;

	phys_size_t ram_size;		/* RAM size */
	unsigned long reloc_off;	/* Relocation Offset */
	unsigned long reset_status;	/* reset status register at boot        */
	unsigned long env_addr;	/* Address  of Environment struct       */
	unsigned long env_valid;	/* Checksum of Environment valid?       */
	unsigned long have_console;	/* serial_init() was called */

#if defined(CONFIG_LCD) || defined(CONFIG_VIDEO)
	unsigned long fb_base;	/* Base address of framebuffer memory   */
#endif
#if defined(CONFIG_POST) || defined(CONFIG_LOGBUFFER)
	unsigned long post_log_word;	/* Record POST activities */
	unsigned long post_init_f_time;	/* When post_init_f started */
#endif
#ifdef CONFIG_BOARD_TYPES
	unsigned long board_type;
#endif
#ifdef CONFIG_MODEM_SUPPORT
	unsigned long do_mdm_init;
	unsigned long be_quiet;
#endif
#ifdef CONFIG_LWMON
	unsigned long kbd_status;
#endif
	void **jt;		/* jump table */
} gd_t;

/*
 * Global Data Flags
 */
#define	GD_FLG_RELOC	0x00001	/* Code was relocated to RAM            */
#define	GD_FLG_DEVINIT	0x00002	/* Devices have been initialized        */
#define	GD_FLG_SILENT	0x00004	/* Silent mode                          */
#define	GD_FLG_POSTFAIL	0x00008	/* Critical POST test failed		*/
#define	GD_FLG_POSTSTOP	0x00010	/* POST seqeunce aborted		*/
#define	GD_FLG_LOGINIT	0x00020	/* Log Buffer has been initialized	*/

#define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("%g7")

#endif				/* __ASM_GBL_DATA_H */