| 1 | /*
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| 2 | * Copyright (c) 2012 Adam Hraska
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup generic
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 | #ifndef KERN_CPU_CPU_MASK_H_
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| 35 | #define KERN_CPU_CPU_MASK_H_
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| 36 |
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| 37 | #include <cpu.h>
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| 38 | #include <config.h>
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| 39 | #include <lib/memfnc.h>
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| 40 |
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| 41 | /** Iterates over all cpu id's whose bit is included in the cpu mask.
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| 42 | *
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| 43 | * Example usage:
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| 44 | * @code
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| 45 | * DEFINE_CPU_MASK(cpu_mask);
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| 46 | * cpu_mask_active(&cpu_mask);
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| 47 | *
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| 48 | * cpu_mask_for_each(cpu_mask, cpu_id) {
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| 49 | * printf("Cpu with logical id %u is active.\n", cpu_id);
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| 50 | * }
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| 51 | * @endcode
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| 52 | */
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| 53 | #define cpu_mask_for_each(mask, cpu_id) \
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| 54 | for (unsigned int (cpu_id) = 0; (cpu_id) < config.cpu_count; ++(cpu_id)) \
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| 55 | if (cpu_mask_is_set(&(mask), (cpu_id)))
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| 56 |
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| 57 | /** Allocates a cpu_mask_t on stack. */
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| 58 | #define DEFINE_CPU_MASK(cpu_mask) \
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| 59 | cpu_mask_t *(cpu_mask) = (cpu_mask_t*) alloca(cpu_mask_size())
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| 60 |
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| 61 | /** If used with DEFINE_CPU_MASK, the mask is large enough for all detected cpus.*/
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| 62 | typedef struct cpu_mask {
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| 63 | unsigned int mask[1];
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| 64 | } cpu_mask_t;
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| 65 |
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| 66 |
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| 67 | extern size_t cpu_mask_size(void);
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| 68 | extern void cpu_mask_active(cpu_mask_t *);
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| 69 | extern void cpu_mask_all(cpu_mask_t *);
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| 70 | extern void cpu_mask_none(cpu_mask_t *);
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| 71 | extern void cpu_mask_set(cpu_mask_t *, unsigned int);
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| 72 | extern void cpu_mask_reset(cpu_mask_t *, unsigned int);
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| 73 | extern bool cpu_mask_is_set(cpu_mask_t *, unsigned int);
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| 74 | extern bool cpu_mask_is_none(cpu_mask_t *);
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| 75 |
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| 76 | #endif /* KERN_CPU_CPU_MASK_H_ */
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| 77 |
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| 78 | /** @}
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| 79 | */
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