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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 5 | |
23 | ||
24 | /* Minimalized TLB entry for use by TCG fast path. */ | |
25 | typedef union CPUTLBEntry { | |
26 | struct { | |
27 | uint64_t addr_read; | |
28 | uint64_t addr_write; | |
29 | uint64_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 | uint64_t addr_idx[(1 << CPU_TLB_ENTRY_BITS) / sizeof(uint64_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 */ |