as_find_containing.c

QNX ADS BSP code for i.MX27 chips

/*
 * $QNXLicenseC: 
 * Copyright 2007, QNX Software Systems.  
 *  
 * Licensed under the Apache License, Version 2.0 (the "License"). You  
 * may not reproduce, modify or distribute this software except in  
 * compliance with the License. You may obtain a copy of the License  
 * at: http://www.apache.org/licenses/LICENSE-2.0  
 *  
 * Unless required by applicable law or agreed to in writing, software  
 * distributed under the License is distributed on an "AS IS" basis,  
 * WITHOUT WARRANTIES OF ANY KIND, either express or implied. 
 * 
 * This file may contain contributions from others, either as  
 * contributors under the License or as licensors under other terms.   
 * Please review this entire file for other proprietary rights or license  
 * notices, as well as the QNX Development Suite License Guide at  
 * http://licensing.qnx.com/license-guide/ for other information. 
 * $
 */

 
 #include "startup.h"

static int
match_name(struct asinfo_entry *base, struct asinfo_entry *as, const char *name) {
	for( ;; ) {
		if(strcmp(__hwi_find_string(as->name), name) == 0) return(1);
		if(as->owner == AS_NULL_OFF) return(0);
		as = ((struct asinfo_entry *)((uint8_t *)base + as->owner));
	}
}

unsigned
as_find_containing(unsigned off, paddr_t start, paddr_t end, const char *container) {
	struct asinfo_entry	*as;
	struct asinfo_entry	*base;
	struct asinfo_entry	*stop;

	as = base = lsp.asinfo.p;
	if(off != AS_NULL_OFF) {
		as = ((struct asinfo_entry *)((uint8_t *)as + off)) + 1;
	}
	stop = (struct asinfo_entry *)((uint8_t *)base + lsp.asinfo.size);
	for( ;; ) {
		if(as >= stop) return(AS_NULL_OFF);
		if(match_name(base, as, container)) {
			if((start >= as->start) && (start <= as->end)) break;
			if((end >= as->start) && (end <= as->end)) break;
			if((start <= as->start) && (end >= as->end)) break;
		}
		++as;
	}
	return((uintptr_t)as - (uintptr_t)base);
}