Changeset cc205f1 in mainline for arch/mips32/src/mm/asid.c

Timestamp:

2005-10-06T12:45:22Z (19 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

fd3c9e5

Parents:

bca1b47

Message:

Add mm/mapping1 test.
(Will not make it past TLB Invalid exception on mips32.)
Fixes in asid.c.
Make TLB register types union with u32 value.
Implement tlb_invalidate() for mips32.
(TLB invalidation and shootdown path will have to be revised.)

File:

• arch/mips32/src/mm/asid.c (modified) (6 diffs)

arch/mips32/src/mm/asid.c

@@ -1 +1 @@
 /*
  * Copyright (C) 2005 Martin Decky
+ * Copyright (C) 2005 Jakub Jermar
  * All rights reserved.
  *
@@ -31 +32 @@
 #include <arch.h>
 #include <debug.h>
-
-#define ASIDS   256
+#include <typedefs.h>
 
 static spinlock_t asid_usage_lock;
@@ -54 +54 @@
         spinlock_lock(&asid_usage_lock);
         
-        for (i=0, j = 0; (i<ASIDS); i++) {
+        for (i = ASID_START, j = ASID_START; i < ASIDS; i++) {
                 if (asid_usage[i] < min) {
                         j = i;
@@ -63 +63 @@
         }
 
-        asid_usage[i]++;
+        asid_usage[j]++;
 
         spinlock_unlock(&asid_usage_lock);
@@ -84 +84 @@
         spinlock_lock(&asid_usage_lock);
 
+        ASSERT(asid != ASID_INVALID);
+        
         ASSERT(asid_usage[asid] > 0);
         asid_usage[asid]--;
@@ -90 +92 @@
         cpu_priority_restore(pri);
 }
+
+/** 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;
+        pri_t pri;
+
+        ASSERT(asid != ASID_INVALID);
+
+        pri = cpu_priority_high();
+        spinlock_lock(&asid_usage_lock);
+
+        if (asid_usage[asid] > 1)
+                has_conflicts = true;
+
+        spinlock_unlock(&asid_usage_lock);
+        cpu_priority_restore(pri);
+
+        return has_conflicts;
+}