1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (c) 2016 Cavium Inc. (support@cavium.com).
7 *
8 */
9
10 /*
11 * Module to support operations on bitmap of cores. Coremask can be used to
12 * select a specific core, a group of cores, or all available cores, for
13 * initialization and differentiation of roles within a single shared binary
14 * executable image.
15 *
16 * The core numbers used in this file are the same value as what is found in
17 * the COP0_EBASE register and the rdhwr 0 instruction.
18 *
19 * For the CN78XX and other multi-node environments the core numbers are not
20 * contiguous. The core numbers for the CN78XX are as follows:
21 *
22 * Node 0: Cores 0 - 47
23 * Node 1: Cores 128 - 175
24 * Node 2: Cores 256 - 303
25 * Node 3: Cores 384 - 431
26 *
27 */
28
29 #ifndef __CVMX_COREMASK_H__
30 #define __CVMX_COREMASK_H__
31
32 #define CVMX_MIPS_MAX_CORES 1024
33 /* bits per holder */
34 #define CVMX_COREMASK_ELTSZ 64
35
36 /* cvmx_coremask_t's size in u64 */
37 #define CVMX_COREMASK_BMPSZ (CVMX_MIPS_MAX_CORES / CVMX_COREMASK_ELTSZ)
38
39
40 /* cvmx_coremask_t */
41 struct cvmx_coremask {
42 u64 coremask_bitmap[CVMX_COREMASK_BMPSZ];
43 };
44
45 /*
46 * Is ``core'' set in the coremask?
47 */
48 static inline bool cvmx_coremask_is_core_set(const struct cvmx_coremask *pcm,
49 int core)
50 {
51 int n, i;
52
53 n = core % CVMX_COREMASK_ELTSZ;
54 i = core / CVMX_COREMASK_ELTSZ;
55
56 return (pcm->coremask_bitmap[i] & ((u64)1 << n)) != 0;
57 }
58
59 /*
60 * Make a copy of a coremask
61 */
62 static inline void cvmx_coremask_copy(struct cvmx_coremask *dest,
63 const struct cvmx_coremask *src)
64 {
65 memcpy(dest, src, sizeof(*dest));
66 }
67
68 /*
69 * Set the lower 64-bit of the coremask.
70 */
71 static inline void cvmx_coremask_set64(struct cvmx_coremask *pcm,
72 uint64_t coremask_64)
73 {
74 pcm->coremask_bitmap[0] = coremask_64;
75 }
76
77 /*
78 * Clear ``core'' from the coremask.
79 */
80 static inline void cvmx_coremask_clear_core(struct cvmx_coremask *pcm, int core)
81 {
82 int n, i;
83
84 n = core % CVMX_COREMASK_ELTSZ;
85 i = core / CVMX_COREMASK_ELTSZ;
86 pcm->coremask_bitmap[i] &= ~(1ull << n);
87 }
88
89 #endif /* __CVMX_COREMASK_H__ */
90
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