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sh_mmu.cpp revision 1.1 
      1 /*	$NetBSD: sh_mmu.cpp,v 1.1 2001/02/09 18:35:19 uch Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001 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 	_kmode = SetKMode(1);
     46 
     47 	_asid = VOLATILE_REF(MMUPTEH) & MMUPTEH_ASID_MASK;
     48 	DPRINTF((TEXT("ASID = %d\n"), _asid));
     49 
     50 	return TRUE;
     51 }
     52 
     53 MemoryManager_SHMMU::~MemoryManager_SHMMU(void)
     54 {
     55 	SetKMode(_kmode);
     56 }
     57 
     58 // get physical address from memory mapped TLB.
     59 paddr_t
     60 MemoryManager_SHMMU::searchPage(vaddr_t vaddr)
     61 {
     62 	u_int32_t vpn, idx, s, dum, aae, dae, entry_idx;
     63 	paddr_t paddr = ~0;
     64 	int way;
     65 
     66 	vpn = vaddr & PAGE_MASK;
     67 	// Windows CE uses VPN-only index-mode.
     68 	idx = vaddr & MMUAA_VPN_MASK;
     69 
     70 	// to avoid another TLB access, disable external interrupt.
     71 	s = suspendIntr();
     72 
     73 	do {
     74 		// load target address page to TLB
     75 		dum = VOLATILE_REF(vaddr);
     76 		VOLATILE_REF(vaddr) = dum;
     77 
     78 		for (way = 0; way < MMU_WAY; way++) {
     79 			entry_idx = idx | (way << MMUAA_WAY_SHIFT);
     80 			// inquire MMU address array.
     81 			aae = VOLATILE_REF(MMUAA | entry_idx);
     82 
     83 			if (!(aae & MMUAA_D_VALID) ||
     84 			    ((aae & MMUAA_D_ASID_MASK) != _asid) ||
     85 			    (((aae | idx) & PAGE_MASK) != vpn))
     86 				continue;
     87 
     88 			// entry found.
     89 			// inquire MMU data array to get its physical address.
     90 			dae = VOLATILE_REF(MMUDA | entry_idx);
     91 			paddr = (dae & PAGE_MASK) | (vaddr & ~PAGE_MASK);
     92 			break;
     93 		}
     94 	} while (paddr == ~0);
     95 
     96 	resumeIntr(s);
     97 
     98 	return paddr;
     99 }
    100 
    101