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Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-ID: <20250320223002.2915728-3-pierrick.bouvier@linaro.org>pull/291/head
committed by
Richard Henderson
14 changed files with 101 additions and 63 deletions
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/*
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* TLB flags definition |
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* |
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* Copyright (c) 2003 Fabrice Bellard |
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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 2.1 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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#ifndef TLB_FLAGS_H |
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#define TLB_FLAGS_H |
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#include "exec/cpu-defs.h" |
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#ifdef CONFIG_USER_ONLY |
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/*
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* Allow some level of source compatibility with softmmu. We do not |
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* support any of the more exotic features, so only invalid pages may |
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* be signaled by probe_access_flags(). |
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*/ |
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#define TLB_INVALID_MASK (1 << (TARGET_PAGE_BITS_MIN - 1)) |
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#define TLB_MMIO (1 << (TARGET_PAGE_BITS_MIN - 2)) |
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#define TLB_WATCHPOINT 0 |
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#else |
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/*
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* Flags stored in the low bits of the TLB virtual address. |
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* These are defined so that fast path ram access is all zeros. |
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* The flags all must be between TARGET_PAGE_BITS and |
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* maximum address alignment bit. |
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* |
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* Use TARGET_PAGE_BITS_MIN so that these bits are constant |
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* when TARGET_PAGE_BITS_VARY is in effect. |
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* |
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* The count, if not the placement of these bits is known |
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* to tcg/tcg-op-ldst.c, check_max_alignment(). |
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*/ |
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/* Zero if TLB entry is valid. */ |
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#define TLB_INVALID_MASK (1 << (TARGET_PAGE_BITS_MIN - 1)) |
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/*
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* Set if TLB entry references a clean RAM page. The iotlb entry will |
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* contain the page physical address. |
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*/ |
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#define TLB_NOTDIRTY (1 << (TARGET_PAGE_BITS_MIN - 2)) |
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/* Set if TLB entry is an IO callback. */ |
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#define TLB_MMIO (1 << (TARGET_PAGE_BITS_MIN - 3)) |
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/* Set if TLB entry writes ignored. */ |
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#define TLB_DISCARD_WRITE (1 << (TARGET_PAGE_BITS_MIN - 4)) |
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/* Set if the slow path must be used; more flags in CPUTLBEntryFull. */ |
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#define TLB_FORCE_SLOW (1 << (TARGET_PAGE_BITS_MIN - 5)) |
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/*
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* Use this mask to check interception with an alignment mask |
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* in a TCG backend. |
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*/ |
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#define TLB_FLAGS_MASK \ |
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(TLB_INVALID_MASK | TLB_NOTDIRTY | TLB_MMIO \ |
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| TLB_FORCE_SLOW | TLB_DISCARD_WRITE) |
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/*
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* Flags stored in CPUTLBEntryFull.slow_flags[x]. |
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* TLB_FORCE_SLOW must be set in CPUTLBEntry.addr_idx[x]. |
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*/ |
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/* Set if TLB entry requires byte swap. */ |
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#define TLB_BSWAP (1 << 0) |
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/* Set if TLB entry contains a watchpoint. */ |
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#define TLB_WATCHPOINT (1 << 1) |
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/* Set if TLB entry requires aligned accesses. */ |
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#define TLB_CHECK_ALIGNED (1 << 2) |
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#define TLB_SLOW_FLAGS_MASK (TLB_BSWAP | TLB_WATCHPOINT | TLB_CHECK_ALIGNED) |
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/* The two sets of flags must not overlap. */ |
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QEMU_BUILD_BUG_ON(TLB_FLAGS_MASK & TLB_SLOW_FLAGS_MASK); |
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#endif /* !CONFIG_USER_ONLY */ |
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#endif /* TLB_FLAGS_H */ |
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