Changeset 4512d7e in mainline for arch/mips32/src/mm/asid.c


Ignore:
Timestamp:
2006-01-19T22:17:47Z (19 years ago)
Author:
Jakub Jermar <jakub@…>
Branches:
lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
Children:
6461d67c
Parents:
64c44e8
Message:

New ASID management subsystem (initial work, more is required).
Some TLB invalidation changes.

File:
1 edited

Legend:

Unmodified
Added
Removed

  • arch/mips32/src/mm/asid.c

    r64c44e8 r4512d7e  
    2929
    3030#include <arch/mm/asid.h>
    31 #include <synch/spinlock.h>
    32 #include <arch.h>
    33 #include <debug.h>
    3431#include <typedefs.h>
    3532
    36 SPINLOCK_INITIALIZE(asid_usage_lock);
    37 static count_t asid_usage[ASIDS];       /**< Usage tracking array for ASIDs */
    38 
    39 /** Get ASID
    40  *
    41  * Get the least used ASID.
    42  *
    43  * @return ASID
    44  */
    45 asid_t asid_get(void)
    46 {
    47         ipl_t ipl;
    48         int i, j;
    49         count_t min;
    50        
    51         min = (unsigned) -1;
    52        
    53         ipl = interrupts_disable();
    54         spinlock_lock(&asid_usage_lock);
    55        
    56         for (i = ASID_START, j = ASID_START; i < ASIDS; i++) {
    57                 if (asid_usage[i] < min) {
    58                         j = i;
    59                         min = asid_usage[i];
    60                         if (!min)
    61                                 break;
    62                 }
    63         }
    64 
    65         asid_usage[j]++;
    66 
    67         spinlock_unlock(&asid_usage_lock);
    68         interrupts_restore(ipl);
    69 
    70         return i;
    71 }
    72 
    73 /** Release ASID
    74  *
    75  * Release ASID by decrementing its usage count.
    76  *
    77  * @param asid ASID.
    78  */
    79 void asid_put(asid_t asid)
    80 {
    81         ipl_t ipl;
    82 
    83         ipl = interrupts_disable();
    84         spinlock_lock(&asid_usage_lock);
    85 
    86         ASSERT(asid != ASID_INVALID);
    87        
    88         ASSERT(asid_usage[asid] > 0);
    89         asid_usage[asid]--;
    90 
    91         spinlock_unlock(&asid_usage_lock);
    92         interrupts_restore(ipl);
    93 }
    94 
    95 /** Find out whether ASID is used by more address spaces
    96  *
    97  * Find out whether ASID is used by more address spaces.
    98  *
    99  * @param asid ASID in question.
    100  *
    101  * @return True if 'asid' is used by more address spaces, false otherwise.
    102  */
    103 bool asid_has_conflicts(asid_t asid)
    104 {
    105         bool has_conflicts = false;
    106         ipl_t ipl;
    107 
    108         ASSERT(asid != ASID_INVALID);
    109 
    110         ipl = interrupts_disable();
    111         spinlock_lock(&asid_usage_lock);
    112 
    113         if (asid_usage[asid] > 1)
    114                 has_conflicts = true;
    115 
    116         spinlock_unlock(&asid_usage_lock);
    117         interrupts_restore(ipl);
    118 
    119         return has_conflicts;
    120 }
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