map_callout_mem.c

来自「QNX ADS BSP code for i.MX27 chips」· C语言 代码 · 共 42 行

/*
 * $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"

void *
callout_memory_map(unsigned size, paddr_t phys, unsigned prot_flags)
{
	int	pf = ARM_PTE_RO | ARM_PTE_CB;

	if (prot_flags & PROT_WRITE)
		pf |= ARM_PTE_RW;
	if (prot_flags & PROT_USER)
		pf |= ARM_PTE_U;
	if (prot_flags & PROT_NOCACHE)
		pf &= ~ARM_PTE_CB;

	/*
	 * FIXME: should this check if the range is already mapped?
	 */
	return (void *)arm_map(~0, phys, size, pf);
}