86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
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/*
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* PowerPC MMU, TLB and BAT emulation helpers for QEMU.
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*
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* Copyright (c) 2003-2007 Jocelyn Mayer
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* Copyright (c) 2013 David Gibson, IBM Corporation
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "cpu.h"
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#include "helper.h"
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#include "sysemu/kvm.h"
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#include "kvm_ppc.h"
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#include "mmu-hash32.h"
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//#define DEBUG_MMU
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#ifdef DEBUG_MMU
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# define LOG_MMU(...) qemu_log(__VA_ARGS__)
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# define LOG_MMU_STATE(env) log_cpu_state((env), 0)
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#else
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# define LOG_MMU(...) do { } while (0)
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# define LOG_MMU_STATE(...) do { } while (0)
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#endif
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#define PTE_PTEM_MASK 0x7FFFFFBF
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#define PTE_CHECK_MASK (TARGET_PAGE_MASK | 0x7B)
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static inline int pte_is_valid_hash32(target_ulong pte0)
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{
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return pte0 & 0x80000000 ? 1 : 0;
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}
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int pte_check_hash32(mmu_ctx_t *ctx, target_ulong pte0,
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target_ulong pte1, int h, int rw, int type)
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{
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target_ulong ptem, mmask;
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int access, ret, pteh, ptev, pp;
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ret = -1;
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/* Check validity and table match */
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ptev = pte_is_valid_hash32(pte0);
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pteh = (pte0 >> 6) & 1;
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if (ptev && h == pteh) {
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/* Check vsid & api */
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ptem = pte0 & PTE_PTEM_MASK;
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mmask = PTE_CHECK_MASK;
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pp = pte1 & 0x00000003;
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if (ptem == ctx->ptem) {
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if (ctx->raddr != (hwaddr)-1ULL) {
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/* all matches should have equal RPN, WIMG & PP */
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if ((ctx->raddr & mmask) != (pte1 & mmask)) {
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qemu_log("Bad RPN/WIMG/PP\n");
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return -3;
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}
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}
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/* Compute access rights */
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access = pp_check(ctx->key, pp, ctx->nx);
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/* Keep the matching PTE informations */
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ctx->raddr = pte1;
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ctx->prot = access;
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ret = check_prot(ctx->prot, rw, type);
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if (ret == 0) {
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/* Access granted */
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LOG_MMU("PTE access granted !\n");
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} else {
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/* Access right violation */
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LOG_MMU("PTE access rejected\n");
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}
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}
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}
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return ret;
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}
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