Changeset 965dc18 in mainline for kernel/arch/sparc64/src/mm/as.c

Timestamp:

2008-12-05T19:59:03Z (15 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

49093a4

Parents:

0258e67

Message:

Merge sparc branch to trunk.

File:

• kernel/arch/sparc64/src/mm/as.c (modified) (1 diff)

kernel/arch/sparc64/src/mm/as.c

@@ -165 +165 @@
         tsb_base.base = ((uintptr_t) as->arch.dtsb) >> MMU_PAGE_WIDTH;
         dtsb_base_write(tsb_base.value);
+        
+#if defined (US3)
+        /*
+         * Clear the extension registers.
+         * In HelenOS, primary and secondary context registers contain
+         * equal values and kernel misses (context 0, ie. the nucleus context)
+         * are excluded from the TSB miss handler, so it makes no sense
+         * to have separate TSBs for primary, secondary and nucleus contexts.
+         * Clearing the extension registers will ensure that the value of the
+         * TSB Base register will be used as an address of TSB, making the code
+         * compatible with the US port. 
+         */
+        itsb_primary_extension_write(0);
+        itsb_nucleus_extension_write(0);
+        dtsb_primary_extension_write(0);
+        dtsb_secondary_extension_write(0);
+        dtsb_nucleus_extension_write(0);
+#endif
 #endif
 }