lenval.h

Uboot源码,非常通用的bootloader.适用于各种平台的Linux系统引导.

/*
 * (C) Copyright 2003
 * Stefan Roese, esd gmbh germany, [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
 */

/*******************************************************/
/* file: lenval.h                                      */
/* abstract:  This file contains a description of the  */
/*            data structure "lenval".                 */
/*******************************************************/

#ifndef lenval_dot_h
#define lenval_dot_h

/* the lenVal structure is a byte oriented type used to store an */
/* arbitrary length binary value. As an example, the hex value   */
/* 0x0e3d is represented as a lenVal with len=2 (since 2 bytes   */
/* and val[0]=0e and val[1]=3d.  val[2-MAX_LEN] are undefined    */

/* maximum length (in bytes) of value to read in        */
/* this needs to be at least 4, and longer than the     */
/* length of the longest SDR instruction.  If there is, */
/* only 1 device in the chain, MAX_LEN must be at least */
/* ceil(27/8) == 4.  For 6 devices in a chain, MAX_LEN  */
/* must be 5, for 14 devices MAX_LEN must be 6, for 20  */
/* devices MAX_LEN must be 7, etc..                     */
/* You can safely set MAX_LEN to a smaller number if you*/
/* know how many devices will be in your chain.         */
#define MAX_LEN 7000


typedef struct var_len_byte
{
	short len;   /* number of chars in this value */
	unsigned char val[MAX_LEN+1];  /* bytes of data */
} lenVal;


/* return the long representation of a lenVal */
extern long value(lenVal *x);

/* set lenVal equal to value */
extern void initLenVal(lenVal *x, long value);

/* check if expected equals actual (taking the mask into account) */
extern short EqualLenVal(lenVal *expected, lenVal *actual, lenVal *mask);

/* add val1+val2 and put the result in resVal */
extern void addVal(lenVal *resVal, lenVal *val1, lenVal *val2);

/* return the (byte, bit) of lv (reading from left to right) */
extern short RetBit(lenVal *lv, int byte, int bit);

/* set the (byte, bit) of lv equal to val (e.g. SetBit("00000000",byte, 1)
   equals "01000000" */
extern void SetBit(lenVal *lv, int byte, int bit, short val);

/* read from XSVF numBytes bytes of data into x */
extern void  readVal(lenVal *x, short numBytes);

#endif