armv_pte_ixp2xxx.c

Centrality Atlas II development software

/*
 * $QNXLicenseC:
 * Copyright 2008, 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"

/*
 * ARMv5 extended page table entries for ixp2400 workaround
 * - RO pages use default caching
 * - RW pages use write-allocate caching
 * - uncached pages need to use X=1,C=0,B=1, so just clear the C bit
 *
 * FIXME: because we require the X-bit set for uncached access, we can't
 *        easily support write-back or write-through caching since the
 *        uncached access is implemented by clearing only those bits
 *        specified by mask_nc.
 */
const struct armv_pte	armv_pte_ixp2xxx = {
	ARM_PTE_XSP | ARM_XSP_PROT(ARM_PTE_RO|ARM_PTE_U) | ARM_PTE_CB,		// upte_ro
	ARM_PTE_XSP | ARM_XSP_PROT(ARM_PTE_RW|ARM_PTE_U) | ARM_PTE_XS_WA,	// upte_rw
	ARM_PTE_XSP | ARM_XSP_PROT(ARM_PTE_RO)           | ARM_PTE_CB,		// kpte_ro
	ARM_PTE_XSP | ARM_XSP_PROT(ARM_PTE_RW)           | ARM_PTE_XS_WA,	// kpte_rw
	ARM_PTE_C,															// mask_nc
	ARM_PTP_L2,															// l1_pgtable
	ARM_PTP_SC | ARM_PTP_AP_RO,											// kscn_ro
	ARM_PTP_SC | ARM_PTP_AP_RW,											// kscn_rw
	ARM_PTP_XS_WA														// kscn_cb
};

__SRCVERSION("armv_pte_ixp2xxx.c $Rev: 206932 $");