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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