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Linux/arch/arm64/include/asm/smp_plat.h

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  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 

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