| 28,93 → 28,5 |
|---|
| */ |
| |
| #include <arch/mm/asid.h> |
| #include <synch/spinlock.h> |
| #include <arch.h> |
| #include <debug.h> |
| #include <typedefs.h> |
| |
| SPINLOCK_INITIALIZE(asid_usage_lock); |
| static count_t asid_usage[ASIDS]; /**< Usage tracking array for ASIDs */ |
| |
| /** Get ASID |
| * |
| * Get the least used ASID. |
| * |
| * @return ASID |
| */ |
| asid_t asid_get(void) |
| { |
| ipl_t ipl; |
| int i, j; |
| count_t min; |
| |
| min = (unsigned) -1; |
| |
| ipl = interrupts_disable(); |
| spinlock_lock(&asid_usage_lock); |
| |
| for (i = ASID_START, j = ASID_START; i < ASIDS; i++) { |
| if (asid_usage[i] < min) { |
| j = i; |
| min = asid_usage[i]; |
| if (!min) |
| break; |
| } |
| } |
| |
| asid_usage[j]++; |
| |
| spinlock_unlock(&asid_usage_lock); |
| interrupts_restore(ipl); |
| |
| return i; |
| } |
| |
| /** Release ASID |
| * |
| * Release ASID by decrementing its usage count. |
| * |
| * @param asid ASID. |
| */ |
| void asid_put(asid_t asid) |
| { |
| ipl_t ipl; |
| |
| ipl = interrupts_disable(); |
| spinlock_lock(&asid_usage_lock); |
| |
| ASSERT(asid != ASID_INVALID); |
| |
| ASSERT(asid_usage[asid] > 0); |
| asid_usage[asid]--; |
| |
| spinlock_unlock(&asid_usage_lock); |
| interrupts_restore(ipl); |
| } |
| |
| /** Find out whether ASID is used by more address spaces |
| * |
| * Find out whether ASID is used by more address spaces. |
| * |
| * @param asid ASID in question. |
| * |
| * @return True if 'asid' is used by more address spaces, false otherwise. |
| */ |
| bool asid_has_conflicts(asid_t asid) |
| { |
| bool has_conflicts = false; |
| ipl_t ipl; |
| |
| ASSERT(asid != ASID_INVALID); |
| |
| ipl = interrupts_disable(); |
| spinlock_lock(&asid_usage_lock); |
| |
| if (asid_usage[asid] > 1) |
| has_conflicts = true; |
| |
| spinlock_unlock(&asid_usage_lock); |
| interrupts_restore(ipl); |
| |
| return has_conflicts; |
| } |