tb-hash.h (2370B)
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 38 static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc) 39 { 40 target_ulong 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 45 static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc) 46 { 47 target_ulong 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 */ 56 static inline unsigned int tb_jmp_cache_hash_func(target_ulong 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 64 uint32_t tb_hash_func(tb_page_addr_t phys_pc, target_ulong pc, uint32_t flags, 65 uint32_t cf_mask, uint32_t trace_vcpu_dstate) 66 { 67 return qemu_xxhash7(phys_pc, pc, flags, cf_mask, trace_vcpu_dstate); 68 } 69 70 #endif