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47 * Module to support operations on bitmap of cores. Coremask can be used to
48 * select a specific core, a group of cores, or all available cores, for
49 * initialization and differentiation of roles within a single shared binary
52 * <hr>$Revision: 41586 $<hr>
56 #include "cvmx-config.h"
58 #include "cvmx-spinlock.h"
59 #include "cvmx-coremask.h"
62 #define CVMX_COREMASK_MAX_SYNCS 20 /* maximum number of coremasks for barrier sync */
65 * This structure defines the private state maintained by coremask module.
68 CVMX_SHARED static struct {
70 cvmx_spinlock_t lock; /**< mutex spinlock */
74 unsigned int coremask; /**< coremask specified for barrier */
75 unsigned int checkin; /**< bitmask of cores checking in */
76 volatile unsigned int exit; /**< variable to poll for exit condition */
78 } s[CVMX_COREMASK_MAX_SYNCS];
82 { CVMX_SPINLOCK_UNLOCKED_VAL },
89 * Wait (stall) until all cores in the given coremask has reached this point
90 * in the program execution before proceeding.
92 * @param coremask the group of cores performing the barrier sync
95 void cvmx_coremask_barrier_sync(unsigned int coremask)
100 assert(coremask != 0);
102 cvmx_spinlock_lock(&state.lock);
104 for (i = 0; i < CVMX_COREMASK_MAX_SYNCS; i++) {
106 if (state.s[i].coremask == 0) {
107 /* end of existing coremask list, create new entry, fall-thru */
108 state.s[i].coremask = coremask;
111 if (state.s[i].coremask == coremask) {
113 target = state.s[i].exit + 1; /* wrap-around at 32b */
115 state.s[i].checkin |= cvmx_coremask_core(cvmx_get_core_num());
116 if (state.s[i].checkin == coremask) {
117 state.s[i].checkin = 0;
118 state.s[i].exit = target; /* signal exit condition */
120 cvmx_spinlock_unlock(&state.lock);
122 while (state.s[i].exit != target)
129 /* error condition - coremask array overflowed */
130 cvmx_spinlock_unlock(&state.lock);