| 1 | /* |
| 2 | * Common definitions for the softmmu tlb |
| 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 EXEC_TLB_COMMON_H |
| 20 | #define EXEC_TLB_COMMON_H 1 |
| 21 | |
| 22 | #define CPU_TLB_ENTRY_BITS (HOST_LONG_BITS == 32 ? 4 : 5) |
| 23 | |
| 24 | /* Minimalized TLB entry for use by TCG fast path. */ |
| 25 | typedef union CPUTLBEntry { |
| 26 | struct { |
| 27 | uintptr_t addr_read; |
| 28 | uintptr_t addr_write; |
| 29 | uintptr_t addr_code; |
| 30 | /* |
| 31 | * Addend to virtual address to get host address. IO accesses |
| 32 | * use the corresponding iotlb value. |
| 33 | */ |
| 34 | uintptr_t addend; |
| 35 | }; |
| 36 | /* |
| 37 | * Padding to get a power of two size, as well as index |
| 38 | * access to addr_{read,write,code}. |
| 39 | */ |
| 40 | uintptr_t addr_idx[(1 << CPU_TLB_ENTRY_BITS) / sizeof(uintptr_t)]; |
| 41 | } CPUTLBEntry; |
| 42 | |
| 43 | QEMU_BUILD_BUG_ON(sizeof(CPUTLBEntry) != (1 << CPU_TLB_ENTRY_BITS)); |
| 44 | |
| 45 | /* |
| 46 | * Data elements that are per MMU mode, accessed by the fast path. |
| 47 | * The structure is aligned to aid loading the pair with one insn. |
| 48 | */ |
| 49 | typedef struct CPUTLBDescFast { |
| 50 | /* Contains (n_entries - 1) << CPU_TLB_ENTRY_BITS */ |
| 51 | uintptr_t mask; |
| 52 | /* The array of tlb entries itself. */ |
| 53 | CPUTLBEntry *table; |
| 54 | } CPUTLBDescFast QEMU_ALIGNED(2 * sizeof(void *)); |
| 55 | |
| 56 | #endif /* EXEC_TLB_COMMON_H */ |