Changeset 36b01bb2 in mainline for arch/ia64/include/mm/asid.h

Timestamp:

2006-01-24T14:38:29Z (20 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

fa7d9c4

Parents:

0d8d27c

Message:

ia64 ASID management code (not tested).

File:

• arch/ia64/include/mm/asid.h (modified) (1 diff)

arch/ia64/include/mm/asid.h

@@ -34 +34 @@
 typedef __u32 asid_t;
 
-/*
- * ASID_MAX can range from 2^18 - 1 to 2^24 - 1,
- * depending on architecture implementation.
+/** Number of ia64 RIDs (Region Identifiers) per kernel ASID. */
+#define RIDS_PER_ASID           7
+#define RID_OVERFLOW            16777216        /* 2^24 */
+
+/**
+ * The point is to have ASID_MAX_ARCH big enough
+ * so that it is never reached and the ASID allocation
+ * mechanism in asid_get() never resorts to stealing.
  */
-#define ASID_MAX_ARCH   16777215        /* 2^24 - 1 */
+#define ASID_MAX_ARCH           ((asid_t) -1)   /**< This value is never reached. */
 
-#define asid_find_free()        ASID_MAX_ARCH
+/**
+ * Value used to recognize the situation when all ASIDs were already allocated.
+ */
+#define ASID_OVERFLOW           (RID_OVERFLOW/RIDS_PER_ASID)
+
 #define asid_put_arch(x)