Annotation of sys/arch/sh/sh/mmu_sh3.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: mmu_sh3.c,v 1.1.1.1 2006/10/06 21:02:55 miod Exp $ */
! 2: /* $NetBSD: mmu_sh3.c,v 1.11 2006/03/04 01:13:35 uwe Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 2002 The NetBSD Foundation, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to The NetBSD Foundation
! 9: * by UCHIYAMA Yasushi.
! 10: *
! 11: * Redistribution and use in source and binary forms, with or without
! 12: * modification, are permitted provided that the following conditions
! 13: * are met:
! 14: * 1. Redistributions of source code must retain the above copyright
! 15: * notice, this list of conditions and the following disclaimer.
! 16: * 2. Redistributions in binary form must reproduce the above copyright
! 17: * notice, this list of conditions and the following disclaimer in the
! 18: * documentation and/or other materials provided with the distribution.
! 19: * 3. All advertising materials mentioning features or use of this software
! 20: * must display the following acknowledgement:
! 21: * This product includes software developed by the NetBSD
! 22: * Foundation, Inc. and its contributors.
! 23: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 24: * contributors may be used to endorse or promote products derived
! 25: * from this software without specific prior written permission.
! 26: *
! 27: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 28: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 29: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 30: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 31: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 37: * POSSIBILITY OF SUCH DAMAGE.
! 38: */
! 39:
! 40: #include <sys/param.h>
! 41: #include <sys/systm.h>
! 42:
! 43: #include <sh/pte.h> /* OpenBSD/sh specific PTE */
! 44: #include <sh/mmu.h>
! 45: #include <sh/mmu_sh3.h>
! 46:
! 47: void
! 48: sh3_mmu_start()
! 49: {
! 50: /* Zero clear all TLB entry */
! 51: sh3_tlb_invalidate_all();
! 52:
! 53: /* Set current ASID to 0 */
! 54: sh_tlb_set_asid(0);
! 55:
! 56: _reg_write_4(SH3_MMUCR, SH3_MMUCR_AT | SH3_MMUCR_TF);
! 57: }
! 58:
! 59: void
! 60: sh3_tlb_invalidate_addr(int asid, vaddr_t va)
! 61: {
! 62: uint32_t a, d;
! 63: int w;
! 64:
! 65: d = (va & SH3_MMUAA_D_VPN_MASK_4K) | asid; /* 4K page */
! 66: va = va & SH3_MMU_VPN_MASK; /* [16:12] entry index */
! 67:
! 68: /* Probe entry and invalidate it. */
! 69: for (w = 0; w < SH3_MMU_WAY; w++) {
! 70: a = va | (w << SH3_MMU_WAY_SHIFT); /* way [9:8] */
! 71: if ((_reg_read_4(SH3_MMUAA | a) &
! 72: (SH3_MMUAA_D_VPN_MASK_4K | SH3_MMUAA_D_ASID_MASK)) == d) {
! 73: _reg_write_4(SH3_MMUAA | a, 0);
! 74: break;
! 75: }
! 76: }
! 77: }
! 78:
! 79: void
! 80: sh3_tlb_invalidate_asid(int asid)
! 81: {
! 82: uint32_t aw, a;
! 83: int e, w;
! 84:
! 85: /* Invalidate entry attribute to ASID */
! 86: for (w = 0; w < SH3_MMU_WAY; w++) {
! 87: aw = (w << SH3_MMU_WAY_SHIFT);
! 88: for (e = 0; e < SH3_MMU_ENTRY; e++) {
! 89: a = aw | (e << SH3_MMU_VPN_SHIFT);
! 90: if ((_reg_read_4(SH3_MMUAA | a) &
! 91: SH3_MMUAA_D_ASID_MASK) == asid) {
! 92: _reg_write_4(SH3_MMUAA | a, 0);
! 93: }
! 94: }
! 95: }
! 96: }
! 97:
! 98: void
! 99: sh3_tlb_invalidate_all()
! 100: {
! 101: uint32_t aw, a;
! 102: int e, w;
! 103:
! 104: /* Zero clear all TLB entry to avoid unexpected VPN match. */
! 105: for (w = 0; w < SH3_MMU_WAY; w++) {
! 106: aw = (w << SH3_MMU_WAY_SHIFT);
! 107: for (e = 0; e < SH3_MMU_ENTRY; e++) {
! 108: a = aw | (e << SH3_MMU_VPN_SHIFT);
! 109: _reg_write_4(SH3_MMUAA | a, 0);
! 110: _reg_write_4(SH3_MMUDA | a, 0);
! 111: }
! 112: }
! 113: }
! 114:
! 115: void
! 116: sh3_tlb_update(int asid, vaddr_t va, uint32_t pte)
! 117: {
! 118: uint32_t oasid;
! 119:
! 120: KDASSERT(asid < 0x100 && (pte & ~PGOFSET) != 0 && va != 0);
! 121:
! 122: /* Save old ASID */
! 123: oasid = _reg_read_4(SH3_PTEH) & SH3_PTEH_ASID_MASK;
! 124:
! 125: /* Invalidate old entry (if any) */
! 126: sh3_tlb_invalidate_addr(asid, va);
! 127:
! 128: /* Load new entry */
! 129: _reg_write_4(SH3_PTEH, (va & ~PGOFSET) | asid);
! 130: _reg_write_4(SH3_PTEL, pte & PG_HW_BITS);
! 131: __asm volatile("ldtlb");
! 132:
! 133: /* Restore old ASID */
! 134: if (asid != oasid)
! 135: _reg_write_4(SH3_PTEH, oasid);
! 136: }
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