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