1 /*
2 * internal execution defines for qemu
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
20 #ifndef EXEC_TB_HASH_H
21 #define EXEC_TB_HASH_H
22
23 #include "exec/cpu-defs.h"
24 #include "exec/exec-all.h"
25 #include "qemu/xxhash.h"
26 #include "tb-jmp-cache.h"
27
28 #ifdef CONFIG_SOFTMMU
29
30 /* Only the bottom TB_JMP_PAGE_BITS of the jump cache hash bits vary for
31 addresses on the same page. The top bits are the same. This allows
32 TLB invalidation to quickly clear a subset of the hash table. */
33 #define TB_JMP_PAGE_BITS (TB_JMP_CACHE_BITS / 2)
34 #define TB_JMP_PAGE_SIZE (1 << TB_JMP_PAGE_BITS)
35 #define TB_JMP_ADDR_MASK (TB_JMP_PAGE_SIZE - 1)
36 #define TB_JMP_PAGE_MASK (TB_JMP_CACHE_SIZE - TB_JMP_PAGE_SIZE)
37
tb_jmp_cache_hash_page(vaddr pc)38 static inline unsigned int tb_jmp_cache_hash_page(vaddr pc)
39 {
40 vaddr tmp;
41 tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
42 return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK;
43 }
44
tb_jmp_cache_hash_func(vaddr pc)45 static inline unsigned int tb_jmp_cache_hash_func(vaddr pc)
46 {
47 vaddr tmp;
48 tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
49 return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK)
50 | (tmp & TB_JMP_ADDR_MASK));
51 }
52
53 #else
54
55 /* In user-mode we can get better hashing because we do not have a TLB */
tb_jmp_cache_hash_func(vaddr pc)56 static inline unsigned int tb_jmp_cache_hash_func(vaddr pc)
57 {
58 return (pc ^ (pc >> TB_JMP_CACHE_BITS)) & (TB_JMP_CACHE_SIZE - 1);
59 }
60
61 #endif /* CONFIG_SOFTMMU */
62
63 static inline
tb_hash_func(tb_page_addr_t phys_pc,vaddr pc,uint32_t flags,uint64_t flags2,uint32_t cf_mask)64 uint32_t tb_hash_func(tb_page_addr_t phys_pc, vaddr pc,
65 uint32_t flags, uint64_t flags2, uint32_t cf_mask)
66 {
67 return qemu_xxhash8(phys_pc, pc, flags2, flags, cf_mask);
68 }
69
70 #endif
71