Changeset 36b01bb2 in mainline

Timestamp:

2006-01-24T14:38:29Z (19 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).

Files:

• arch/ia64/Makefile.inc (modified) (1 diff)
• arch/ia64/include/mm/asid.h (modified) (1 diff)
• arch/ia64/src/mm/asid.c (added)
• arch/ia64/src/mm/tlb.c (added)
• genarch/src/mm/asid.c (modified) (1 diff)
• generic/src/mm/tlb.c (modified) (2 diffs)

arch/ia64/Makefile.inc

@@ -65 +65 @@
         arch/$(ARCH)/src/ivt.S \
         arch/$(ARCH)/src/interrupt.c \
+        arch/$(ARCH)/src/mm/asid.c \
         arch/$(ARCH)/src/mm/frame.c \
         arch/$(ARCH)/src/mm/page.c \
+        arch/$(ARCH)/src/mm/tlb.c \
         arch/$(ARCH)/src/drivers/it.c

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)
 

genarch/src/mm/asid.c

@@ -126 +126 @@
                 tlb_shootdown_start(TLB_INVL_ASID, asid, 0, 0);
                 tlb_shootdown_finalize();
+                tlb_invalidate_asid(asid);
                 as->asid = ASID_INVALID;
                 

generic/src/mm/tlb.c

@@ -55 +55 @@
         
         /*
-         * TODO: assemble shootdown message.
+         * TODO: wrap parameters into a message and
+         * dispatch it to all CPUs excluding this one.
          */
+        
         tlb_shootdown_ipi_send();
 
-        switch (type) {
-            case TLB_INVL_ALL:
-                tlb_invalidate_all();
-                break;
-            case TLB_INVL_ASID:
-                tlb_invalidate_asid(asid);
-                break;
-            case TLB_INVL_PAGES:
-                tlb_invalidate_pages(asid, page, cnt);
-                break;
-            default:
-                panic("unknown tlb_invalidate_type_t value: %d\n", type);
-                break;
-        }
-        
 busy_wait:      
         for (i = 0; i<config.cpu_count; i++)
@@ -96 +83 @@
         spinlock_lock(&tlblock);
         spinlock_unlock(&tlblock);
-        tlb_invalidate_all();   /* TODO: use valid ASID */
+        tlb_invalidate_all();   /* TODO: be more finer-grained in what to invalidate */
         CPU->tlb_active = 1;
 }