1 /* 2 * Definitions specific to SMP platforms. 3 * 4 * Copyright (C) 2013 ARM Ltd. 5 * 6 * This program is free software: you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #ifndef __ASM_SMP_PLAT_H 20 #define __ASM_SMP_PLAT_H 21 22 #include <linux/cpumask.h> 23 24 #include <asm/types.h> 25 26 struct mpidr_hash { 27 u64 mask; 28 u32 shift_aff[4]; 29 u32 bits; 30 }; 31 32 extern struct mpidr_hash mpidr_hash; 33 34 static inline u32 mpidr_hash_size(void) 35 { 36 return 1 << mpidr_hash.bits; 37 } 38 39 /* 40 * Logical CPU mapping. 41 */ 42 extern u64 __cpu_logical_map[NR_CPUS]; 43 #define cpu_logical_map(cpu) __cpu_logical_map[cpu] 44 /* 45 * Retrieve logical cpu index corresponding to a given MPIDR.Aff* 46 * - mpidr: MPIDR.Aff* bits to be used for the look-up 47 * 48 * Returns the cpu logical index or -EINVAL on look-up error 49 */ 50 static inline int get_logical_index(u64 mpidr) 51 { 52 int cpu; 53 for (cpu = 0; cpu < nr_cpu_ids; cpu++) 54 if (cpu_logical_map(cpu) == mpidr) 55 return cpu; 56 return -EINVAL; 57 } 58 59 #endif /* __ASM_SMP_PLAT_H */ 60