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/* $OpenBSD: mmu_sh3.c,v 1.2 2008/06/26 05:42:13 ray Exp $ */
/* $NetBSD: mmu_sh3.c,v 1.11 2006/03/04 01:13:35 uwe Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by UCHIYAMA Yasushi.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sh/pte.h> /* OpenBSD/sh specific PTE */
#include <sh/mmu.h>
#include <sh/mmu_sh3.h>
void
sh3_mmu_start()
{
/* Zero clear all TLB entry */
sh3_tlb_invalidate_all();
/* Set current ASID to 0 */
sh_tlb_set_asid(0);
_reg_write_4(SH3_MMUCR, SH3_MMUCR_AT | SH3_MMUCR_TF);
}
void
sh3_tlb_invalidate_addr(int asid, vaddr_t va)
{
uint32_t a, d;
int w;
d = (va & SH3_MMUAA_D_VPN_MASK_4K) | asid; /* 4K page */
va = va & SH3_MMU_VPN_MASK; /* [16:12] entry index */
/* Probe entry and invalidate it. */
for (w = 0; w < SH3_MMU_WAY; w++) {
a = va | (w << SH3_MMU_WAY_SHIFT); /* way [9:8] */
if ((_reg_read_4(SH3_MMUAA | a) &
(SH3_MMUAA_D_VPN_MASK_4K | SH3_MMUAA_D_ASID_MASK)) == d) {
_reg_write_4(SH3_MMUAA | a, 0);
break;
}
}
}
void
sh3_tlb_invalidate_asid(int asid)
{
uint32_t aw, a;
int e, w;
/* Invalidate entry attribute to ASID */
for (w = 0; w < SH3_MMU_WAY; w++) {
aw = (w << SH3_MMU_WAY_SHIFT);
for (e = 0; e < SH3_MMU_ENTRY; e++) {
a = aw | (e << SH3_MMU_VPN_SHIFT);
if ((_reg_read_4(SH3_MMUAA | a) &
SH3_MMUAA_D_ASID_MASK) == asid) {
_reg_write_4(SH3_MMUAA | a, 0);
}
}
}
}
void
sh3_tlb_invalidate_all()
{
uint32_t aw, a;
int e, w;
/* Zero clear all TLB entry to avoid unexpected VPN match. */
for (w = 0; w < SH3_MMU_WAY; w++) {
aw = (w << SH3_MMU_WAY_SHIFT);
for (e = 0; e < SH3_MMU_ENTRY; e++) {
a = aw | (e << SH3_MMU_VPN_SHIFT);
_reg_write_4(SH3_MMUAA | a, 0);
_reg_write_4(SH3_MMUDA | a, 0);
}
}
}
void
sh3_tlb_update(int asid, vaddr_t va, uint32_t pte)
{
uint32_t oasid;
KDASSERT(asid < 0x100 && (pte & ~PGOFSET) != 0 && va != 0);
/* Save old ASID */
oasid = _reg_read_4(SH3_PTEH) & SH3_PTEH_ASID_MASK;
/* Invalidate old entry (if any) */
sh3_tlb_invalidate_addr(asid, va);
/* Load new entry */
_reg_write_4(SH3_PTEH, (va & ~PGOFSET) | asid);
_reg_write_4(SH3_PTEL, pte & PG_HW_BITS);
__asm volatile("ldtlb");
/* Restore old ASID */
if (asid != oasid)
_reg_write_4(SH3_PTEH, oasid);
}
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