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 27 #ifdef CONFIG_SOFTMMU 28 29 /* Only the bottom TB_JMP_PAGE_BITS of the jump cache hash bits vary for 30 addresses on the same page. The top bits are the same. This allows 31 TLB invalidation to quickly clear a subset of the hash table. */ 32 #define TB_JMP_PAGE_BITS (TB_JMP_CACHE_BITS / 2) 33 #define TB_JMP_PAGE_SIZE (1 << TB_JMP_PAGE_BITS) 34 #define TB_JMP_ADDR_MASK (TB_JMP_PAGE_SIZE - 1) 35 #define TB_JMP_PAGE_MASK (TB_JMP_CACHE_SIZE - TB_JMP_PAGE_SIZE) 36 37 static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc) 38 { 39 target_ulong tmp; 40 tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)); 41 return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK; 42 } 43 44 static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc) 45 { 46 target_ulong tmp; 47 tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)); 48 return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK) 49 | (tmp & TB_JMP_ADDR_MASK)); 50 } 51 52 #else 53 54 /* In user-mode we can get better hashing because we do not have a TLB */ 55 static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc) 56 { 57 return (pc ^ (pc >> TB_JMP_CACHE_BITS)) & (TB_JMP_CACHE_SIZE - 1); 58 } 59 60 #endif /* CONFIG_SOFTMMU */ 61 62 static inline 63 uint32_t tb_hash_func(tb_page_addr_t phys_pc, target_ulong pc, uint32_t flags, 64 uint32_t cf_mask, uint32_t trace_vcpu_dstate) 65 { 66 return qemu_xxhash7(phys_pc, pc, flags, cf_mask, trace_vcpu_dstate); 67 } 68 69 #endif 70