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sh_mmu.cpp revision 1.2 
      1 /*	$NetBSD: sh_mmu.cpp,v 1.2 2002/02/04 17:38:27 uch Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001, 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by UCHIYAMA Yasushi.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sh3/sh_arch.h>
     40 #include <sh3/sh_mmu.h>
     41 
     42 BOOL
     43 MemoryManager_SHMMU::init(void)
     44 {
     45 
     46 	_kmode = SetKMode(1);
     47 
     48 	_asid = VOLATILE_REF(MMUPTEH) & MMUPTEH_ASID_MASK;
     49 	DPRINTF((TEXT("ASID = %d\n"), _asid));
     50 
     51 	return TRUE;
     52 }
     53 
     54 MemoryManager_SHMMU::~MemoryManager_SHMMU(void)
     55 {
     56 
     57 	SetKMode(_kmode);
     58 }
     59 
     60 // get physical address from memory mapped TLB.
     61 paddr_t
     62 MemoryManager_SHMMU::searchPage(vaddr_t vaddr)
     63 {
     64 	u_int32_t vpn, idx, s, dum, aae, dae, entry_idx;
     65 	paddr_t paddr = ~0;
     66 	int way;
     67 
     68 	vpn = vaddr & SH3_PAGE_MASK;
     69 	// Windows CE uses VPN-only index-mode.
     70 	idx = vaddr & MMUAA_VPN_MASK;
     71 
     72 	// to avoid another TLB access, disable external interrupt.
     73 	s = suspendIntr();
     74 
     75 	do {
     76 		// load target address page to TLB
     77 		dum = VOLATILE_REF(vaddr);
     78 		VOLATILE_REF(vaddr) = dum;
     79 
     80 		for (way = 0; way < MMU_WAY; way++) {
     81 			entry_idx = idx | (way << MMUAA_WAY_SHIFT);
     82 			// inquire MMU address array.
     83 			aae = VOLATILE_REF(MMUAA | entry_idx);
     84 
     85 			if (!(aae & MMUAA_D_VALID) ||
     86 			    ((aae & MMUAA_D_ASID_MASK) != _asid) ||
     87 			    (((aae | idx) & SH3_PAGE_MASK) != vpn))
     88 				continue;
     89 
     90 			// entry found.
     91 			// inquire MMU data array to get its physical address.
     92 			dae = VOLATILE_REF(MMUDA | entry_idx);
     93 			paddr = (dae & SH3_PAGE_MASK) | (vaddr & ~SH3_PAGE_MASK);
     94 			break;
     95 		}
     96 	} while (paddr == ~0);
     97 
     98 	resumeIntr(s);
     99 
    100 	return paddr;
    101 }
    102 
    103