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#ifndef __LINUX_CPUMASK_H

#define __LINUX_CPUMASK_H

/*

 * Cpumasks provide a bitmap suitable for representing the

 * set of CPU's in a system, one bit position per CPU number.

 *

 * See detailed comments in the file linux/bitmap.h describing the

 * data type on which these cpumasks are based.

 *

 * For details of cpumask_scnprintf() and cpumask_parse_user(),

 * see bitmap_scnprintf() and bitmap_parse_user() in lib/bitmap.c.

 * For details of cpulist_scnprintf() and cpulist_parse(), see

 * bitmap_scnlistprintf() and bitmap_parselist(), also in bitmap.c.

 * For details of cpu_remap(), see bitmap_bitremap in lib/bitmap.c

 * For details of cpus_remap(), see bitmap_remap in lib/bitmap.c.

 *

 * The available cpumask operations are:

 *

 * void cpu_set(cpu, mask)              turn on bit 'cpu' in mask

 * void cpu_clear(cpu, mask)            turn off bit 'cpu' in mask

 * void cpus_setall(mask)               set all bits

 * void cpus_clear(mask)                clear all bits

 * int cpu_isset(cpu, mask)             true iff bit 'cpu' set in mask

 * int cpu_test_and_set(cpu, mask)      test and set bit 'cpu' in mask

 *

 * void cpus_and(dst, src1, src2)       dst = src1 & src2  [intersection]

 * void cpus_or(dst, src1, src2)        dst = src1 | src2  [union]

 * void cpus_xor(dst, src1, src2)       dst = src1 ^ src2

 * void cpus_andnot(dst, src1, src2)    dst = src1 & ~src2

 * void cpus_complement(dst, src)       dst = ~src

 *

 * int cpus_equal(mask1, mask2)         Does mask1 == mask2?

 * int cpus_intersects(mask1, mask2)    Do mask1 and mask2 intersect?

 * int cpus_subset(mask1, mask2)        Is mask1 a subset of mask2?

 * int cpus_empty(mask)                 Is mask empty (no bits sets)?

 * int cpus_full(mask)                  Is mask full (all bits sets)?

 * int cpus_weight(mask)                Hamming weigh - number of set bits

 *

 * void cpus_shift_right(dst, src, n)   Shift right

 * void cpus_shift_left(dst, src, n)    Shift left

 *

 * int first_cpu(mask)                  Number lowest set bit, or NR_CPUS

 * int next_cpu(cpu, mask)              Next cpu past 'cpu', or NR_CPUS

 *

 * cpumask_t cpumask_of_cpu(cpu)        Return cpumask with bit 'cpu' set

 * CPU_MASK_ALL                         Initializer - all bits set

 * CPU_MASK_NONE                        Initializer - no bits set

 * unsigned long *cpus_addr(mask)       Array of unsigned long's in mask

 *

 * int cpumask_scnprintf(buf, len, mask) Format cpumask for printing

 * int cpumask_parse_user(ubuf, ulen, mask)     Parse ascii string as cpumask

 * int cpulist_scnprintf(buf, len, mask) Format cpumask as list for printing

 * int cpulist_parse(buf, map)          Parse ascii string as cpulist

 * int cpu_remap(oldbit, old, new)      newbit = map(old, new)(oldbit)

 * int cpus_remap(dst, src, old, new)   *dst = map(old, new)(src)

 *

 * for_each_cpu_mask(cpu, mask)         for-loop cpu over mask

 *

 * int num_online_cpus()                Number of online CPUs

 * int num_possible_cpus()              Number of all possible CPUs

 * int num_present_cpus()               Number of present CPUs

 *

 * int cpu_online(cpu)                  Is some cpu online?

 * int cpu_possible(cpu)                Is some cpu possible?

 * int cpu_present(cpu)                 Is some cpu present (can schedule)?

 *

 * int any_online_cpu(mask)             First online cpu in mask

 *

 * for_each_possible_cpu(cpu)           for-loop cpu over cpu_possible_map

 * for_each_online_cpu(cpu)             for-loop cpu over cpu_online_map

 * for_each_present_cpu(cpu)            for-loop cpu over cpu_present_map

 *

 * Subtlety:

 * 1) The 'type-checked' form of cpu_isset() causes gcc (3.3.2, anyway)

 *    to generate slightly worse code.  Note for example the additional

 *    40 lines of assembly code compiling the "for each possible cpu"

 *    loops buried in the disk_stat_read() macros calls when compiling

 *    drivers/block/genhd.c (arch i386, CONFIG_SMP=y).  So use a simple

 *    one-line #define for cpu_isset(), instead of wrapping an inline

 *    inside a macro, the way we do the other calls.

 */

#include <linux/kernel.h>

#include <linux/threads.h>

#include <linux/bitmap.h>

typedef struct { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;

extern cpumask_t _unused_cpumask_arg_;

#define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))

static inline void __cpu_set(int cpu, volatile cpumask_t *dstp)

{

        set_bit(cpu, dstp->bits);

}

#define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))

static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp)

{

        clear_bit(cpu, dstp->bits);

}

#define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)

static inline void __cpus_setall(cpumask_t *dstp, int nbits)

{

        bitmap_fill(dstp->bits, nbits);

}

#define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)

static inline void __cpus_clear(cpumask_t *dstp, int nbits)

{

        bitmap_zero(dstp->bits, nbits);

}

/* No static inline type checking - see Subtlety (1) above. */

#define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)

#define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))

static inline int __cpu_test_and_set(int cpu, cpumask_t *addr)

{

        return test_and_set_bit(cpu, addr->bits);

}

#define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)

static inline void __cpus_and(cpumask_t *dstp, const cpumask_t *src1p,

                                        const cpumask_t *src2p, int nbits)

{

        bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);

}

#define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)

static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p,

                                        const cpumask_t *src2p, int nbits)

{

        bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);

}

#define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)

static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p,

                                        const cpumask_t *src2p, int nbits)

{

        bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);

}

#define cpus_andnot(dst, src1, src2) \

                                __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)

static inline void __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p,

                                        const cpumask_t *src2p, int nbits)

{

        bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);

}

#define cpus_complement(dst, src) __cpus_complement(&(dst), &(src), NR_CPUS)

static inline void __cpus_complement(cpumask_t *dstp,

                                        const cpumask_t *srcp, int nbits)

{

        bitmap_complement(dstp->bits, srcp->bits, nbits);

}

#define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)

static inline int __cpus_equal(const cpumask_t *src1p,

                                        const cpumask_t *src2p, int nbits)

{

        return bitmap_equal(src1p->bits, src2p->bits, nbits);

}

#define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)

static inline int __cpus_intersects(const cpumask_t *src1p,

                                        const cpumask_t *src2p, int nbits)

{

        return bitmap_intersects(src1p->bits, src2p->bits, nbits);

}

#define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)

static inline int __cpus_subset(const cpumask_t *src1p,

                                        const cpumask_t *src2p, int nbits)

{

        return bitmap_subset(src1p->bits, src2p->bits, nbits);

}

#define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)

static inline int __cpus_empty(const cpumask_t *srcp, int nbits)

{

        return bitmap_empty(srcp->bits, nbits);

}

#define cpus_full(cpumask) __cpus_full(&(cpumask), NR_CPUS)

static inline int __cpus_full(const cpumask_t *srcp, int nbits)

{

        return bitmap_full(srcp->bits, nbits);

}

#define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)

static inline int __cpus_weight(const cpumask_t *srcp, int nbits)

{

        return bitmap_weight(srcp->bits, nbits);

}

#define cpus_shift_right(dst, src, n) \

                        __cpus_shift_right(&(dst), &(src), (n), NR_CPUS)

static inline void __cpus_shift_right(cpumask_t *dstp,

                                        const cpumask_t *srcp, int n, int nbits)

{

        bitmap_shift_right(dstp->bits, srcp->bits, n, nbits);

}

#define cpus_shift_left(dst, src, n) \

                        __cpus_shift_left(&(dst), &(src), (n), NR_CPUS)

static inline void __cpus_shift_left(cpumask_t *dstp,

                                        const cpumask_t *srcp, int n, int nbits)

{

        bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);

}

#ifdef CONFIG_SMP

int __first_cpu(const cpumask_t *srcp);

#define first_cpu(src) __first_cpu(&(src))

int __next_cpu(int n, const cpumask_t *srcp);

#define next_cpu(n, src) __next_cpu((n), &(src))

#else

#define first_cpu(src)          0

#define next_cpu(n, src)        1

#endif

#define cpumask_of_cpu(cpu)                                             \

({                                                                      \

        typeof(_unused_cpumask_arg_) m;                                 \

        if (sizeof(m) == sizeof(unsigned long)) {                       \

                m.bits[0] = 1UL<<(cpu);                                  \

        } else {                                                        \

                cpus_clear(m);                                          \

                cpu_set((cpu), m);                                      \

        }                                                               \

        m;                                                              \

})

#define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)

#if NR_CPUS <= BITS_PER_LONG

#define CPU_MASK_ALL                                                    \

(cpumask_t) { {                                                         \

        [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD                 \

} }

#else

#define CPU_MASK_ALL                                                    \

(cpumask_t) { {                                                         \

        [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL,                 \

        [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD                 \

} }

#endif

#define CPU_MASK_NONE                                                   \

(cpumask_t) { {                                                         \

        [0 ... BITS_TO_LONGS(NR_CPUS)-1] =  0UL                          \

} }

#define CPU_MASK_CPU0                                                   \

(cpumask_t) { {                                                         \

        [0] =  1UL                                                       \

} }

#define cpus_addr(src) ((src).bits)

#define cpumask_scnprintf(buf, len, src) \

                        __cpumask_scnprintf((buf), (len), &(src), NR_CPUS)

static inline int __cpumask_scnprintf(char *buf, int len,

                                        const cpumask_t *srcp, int nbits)

{

        return bitmap_scnprintf(buf, len, srcp->bits, nbits);

}

#define cpumask_parse_user(ubuf, ulen, dst) \

                        __cpumask_parse_user((ubuf), (ulen), &(dst), NR_CPUS)

static inline int __cpumask_parse_user(const char __user *buf, int len,

                                        cpumask_t *dstp, int nbits)

{

        return bitmap_parse_user(buf, len, dstp->bits, nbits);

}

#define cpulist_scnprintf(buf, len, src) \

                        __cpulist_scnprintf((buf), (len), &(src), NR_CPUS)

static inline int __cpulist_scnprintf(char *buf, int len,

                                        const cpumask_t *srcp, int nbits)

{

        return bitmap_scnlistprintf(buf, len, srcp->bits, nbits);

}

#define cpulist_parse(buf, dst) __cpulist_parse((buf), &(dst), NR_CPUS)

static inline int __cpulist_parse(const char *buf, cpumask_t *dstp, int nbits)

{

        return bitmap_parselist(buf, dstp->bits, nbits);

}

#define cpu_remap(oldbit, old, new) \

                __cpu_remap((oldbit), &(old), &(new), NR_CPUS)

static inline int __cpu_remap(int oldbit,

                const cpumask_t *oldp, const cpumask_t *newp, int nbits)

{

        return bitmap_bitremap(oldbit, oldp->bits, newp->bits, nbits);

}

#define cpus_remap(dst, src, old, new) \

                __cpus_remap(&(dst), &(src), &(old), &(new), NR_CPUS)

static inline void __cpus_remap(cpumask_t *dstp, const cpumask_t *srcp,

                const cpumask_t *oldp, const cpumask_t *newp, int nbits)

{

        bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits);

}

#if NR_CPUS > 1

#define for_each_cpu_mask(cpu, mask)            \

        for ((cpu) = first_cpu(mask);           \

                (cpu) < NR_CPUS;                \

                (cpu) = next_cpu((cpu), (mask)))

#else /* NR_CPUS == 1 */

#define for_each_cpu_mask(cpu, mask)            \

        for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)

#endif /* NR_CPUS */

/*

 * The following particular system cpumasks and operations manage

 * possible, present and online cpus.  Each of them is a fixed size

 * bitmap of size NR_CPUS.

 *

 *  #ifdef CONFIG_HOTPLUG_CPU

 *     cpu_possible_map - has bit 'cpu' set iff cpu is populatable

 *     cpu_present_map  - has bit 'cpu' set iff cpu is populated

 *     cpu_online_map   - has bit 'cpu' set iff cpu available to scheduler

 *  #else

 *     cpu_possible_map - has bit 'cpu' set iff cpu is populated

 *     cpu_present_map  - copy of cpu_possible_map

 *     cpu_online_map   - has bit 'cpu' set iff cpu available to scheduler

 *  #endif

 *

 *  In either case, NR_CPUS is fixed at compile time, as the static

 *  size of these bitmaps.  The cpu_possible_map is fixed at boot

 *  time, as the set of CPU id's that it is possible might ever

 *  be plugged in at anytime during the life of that system boot.

 *  The cpu_present_map is dynamic(*), representing which CPUs

 *  are currently plugged in.  And cpu_online_map is the dynamic

 *  subset of cpu_present_map, indicating those CPUs available

 *  for scheduling.

 *

 *  If HOTPLUG is enabled, then cpu_possible_map is forced to have

 *  all NR_CPUS bits set, otherwise it is just the set of CPUs that

 *  ACPI reports present at boot.

 *

 *  If HOTPLUG is enabled, then cpu_present_map varies dynamically,

 *  depending on what ACPI reports as currently plugged in, otherwise

 *  cpu_present_map is just a copy of cpu_possible_map.

 *

 *  (*) Well, cpu_present_map is dynamic in the hotplug case.  If not

 *      hotplug, it's a copy of cpu_possible_map, hence fixed at boot.

 *

 * Subtleties:

 * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode

 *    assumption that their single CPU is online.  The UP

 *    cpu_{online,possible,present}_maps are placebos.  Changing them

 *    will have no useful affect on the following num_*_cpus()

 *    and cpu_*() macros in the UP case.  This ugliness is a UP

 *    optimization - don't waste any instructions or memory references

 *    asking if you're online or how many CPUs there are if there is

 *    only one CPU.

 * 2) Most SMP arch's #define some of these maps to be some

 *    other map specific to that arch.  Therefore, the following

 *    must be #define macros, not inlines.  To see why, examine

 *    the assembly code produced by the following.  Note that

 *    set1() writes phys_x_map, but set2() writes x_map:

 *        int x_map, phys_x_map;

 *        #define set1(a) x_map = a

 *        inline void set2(int a) { x_map = a; }

 *        #define x_map phys_x_map

 *        main(){ set1(3); set2(5); }

 */

extern cpumask_t cpu_possible_map;

extern cpumask_t cpu_online_map;

extern cpumask_t cpu_present_map;

#if NR_CPUS > 1

#define num_online_cpus()       cpus_weight(cpu_online_map)

#define num_possible_cpus()     cpus_weight(cpu_possible_map)

#define num_present_cpus()      cpus_weight(cpu_present_map)

#define cpu_online(cpu)         cpu_isset((cpu), cpu_online_map)

#define cpu_possible(cpu)       cpu_isset((cpu), cpu_possible_map)

#define cpu_present(cpu)        cpu_isset((cpu), cpu_present_map)

#else

#define num_online_cpus()       1

#define num_possible_cpus()     1

#define num_present_cpus()      1

#define cpu_online(cpu)         ((cpu) == 0)

#define cpu_possible(cpu)       ((cpu) == 0)

#define cpu_present(cpu)        ((cpu) == 0)

#endif

#define cpu_is_offline(cpu)     unlikely(!cpu_online(cpu))

#ifdef CONFIG_SMP

extern int nr_cpu_ids;

#define any_online_cpu(mask) __any_online_cpu(&(mask))

int __any_online_cpu(const cpumask_t *mask);

#else

#define nr_cpu_ids                      1

#define any_online_cpu(mask)            0

#endif

#define for_each_possible_cpu(cpu)  for_each_cpu_mask((cpu), cpu_possible_map)

#define for_each_online_cpu(cpu)  for_each_cpu_mask((cpu), cpu_online_map)

#define for_each_present_cpu(cpu) for_each_cpu_mask((cpu), cpu_present_map)

#endif /* __LINUX_CPUMASK_H */