| 1 | /* |
| 2 | * TLB flags definition |
| 3 | * |
| 4 | * Copyright (c) 2003 Fabrice Bellard |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | #ifndef TLB_FLAGS_H |
| 20 | #define TLB_FLAGS_H |
| 21 | |
| 22 | /* |
| 23 | * Flags returned for lookup of a TLB virtual address. |
| 24 | */ |
| 25 | |
| 26 | #ifdef CONFIG_USER_ONLY |
| 27 | |
| 28 | /* |
| 29 | * Allow some level of source compatibility with softmmu. |
| 30 | * INVALID is set when the page does not have requested permissions. |
| 31 | * FORCE_SLOW is set when we want the target helper to use the functional |
| 32 | * interface for load/store so that plugins see the access. |
| 33 | */ |
| 34 | #define TLB_INVALID_MASK (1 << 0) |
| 35 | #define TLB_FORCE_SLOW (1 << 1) |
| 36 | #define TLB_MMIO 0 |
| 37 | #define TLB_WATCHPOINT 0 |
| 38 | |
| 39 | #else |
| 40 | |
| 41 | /* |
| 42 | * Flags stored in CPUTLBEntryFull.slow_flags[x]. |
| 43 | * TLB_FORCE_SLOW must be set in CPUTLBEntry.addr_idx[x]. |
| 44 | */ |
| 45 | |
| 46 | /* Set if TLB entry requires byte swap. */ |
| 47 | #define TLB_BSWAP (1 << 0) |
| 48 | /* Set if TLB entry contains a watchpoint. */ |
| 49 | #define TLB_WATCHPOINT (1 << 1) |
| 50 | /* Set if TLB entry requires aligned accesses. */ |
| 51 | #define TLB_CHECK_ALIGNED (1 << 2) |
| 52 | /* Set if TLB entry writes ignored. */ |
| 53 | #define TLB_DISCARD_WRITE (1 << 3) |
| 54 | /* Set if TLB entry is an IO callback. */ |
| 55 | #define TLB_MMIO (1 << 4) |
| 56 | |
| 57 | #define TLB_SLOW_FLAGS_MASK \ |
| 58 | (TLB_BSWAP | TLB_WATCHPOINT | TLB_CHECK_ALIGNED | \ |
| 59 | TLB_DISCARD_WRITE | TLB_MMIO) |
| 60 | |
| 61 | /* |
| 62 | * Flags stored in CPUTLBEntry.addr_idx[x]. |
| 63 | * These must be above the largest alignment (64 bytes), |
| 64 | * and below the smallest page size (1024 bytes). |
| 65 | * This leaves bits [9:6] available for use. |
| 66 | */ |
| 67 | |
| 68 | /* Zero if TLB entry is valid. */ |
| 69 | #define TLB_INVALID_MASK (1 << 6) |
| 70 | /* Set if TLB entry references a clean RAM page. */ |
| 71 | #define TLB_NOTDIRTY (1 << 7) |
| 72 | /* Set if the slow path must be used; more flags in CPUTLBEntryFull. */ |
| 73 | #define TLB_FORCE_SLOW (1 << 8) |
| 74 | |
| 75 | /* |
| 76 | * Use this mask to check interception with an alignment mask |
| 77 | * in a TCG backend. |
| 78 | */ |
| 79 | #define TLB_FLAGS_MASK \ |
| 80 | (TLB_INVALID_MASK | TLB_NOTDIRTY | TLB_FORCE_SLOW) |
| 81 | |
| 82 | /* The two sets of flags must not overlap. */ |
| 83 | QEMU_BUILD_BUG_ON(TLB_FLAGS_MASK & TLB_SLOW_FLAGS_MASK); |
| 84 | |
| 85 | #endif /* !CONFIG_USER_ONLY */ |
| 86 | |
| 87 | #endif /* TLB_FLAGS_H */ |