Changeset 92778f2 in mainline for kernel/arch/sparc64/src/mm/as.c

Timestamp:

2006-12-04T21:14:07Z (18 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

4b43f86

Parents:

3d76996

Message:

Initial support for handling illegal virtual aliases on sparc64.

File:

• kernel/arch/sparc64/src/mm/as.c (modified) (3 diffs)

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

@@ -48 +48 @@
 #include <bitops.h>
 #include <macros.h>
-#endif
+#endif /* CONFIG_TSB */
+
+#ifdef CONFIG_VIRT_IDX_DCACHE
+#include <arch/mm/cache.h>
+#endif /* CONFIG_VIRT_IDX_DCACHE */
 
 /** Architecture dependent address space init. */
@@ -159 +163 @@
         dtsb_base_write(tsb_base.value);
 #endif
+#ifdef CONFIG_VIRT_IDX_DCACHE
+        if (as->dcache_flush_on_install) {
+                /*
+                 * Some mappings in this address space are illegal address
+                 * aliases. Upon their creation, the flush_dcache_on_install
+                 * flag was set.
+                 *
+                 * We are now obliged to flush the D-cache in order to guarantee
+                 * that there will be at most one cache line for each address
+                 * alias.
+                 *
+                 * This flush performs a cleanup after another address space in
+                 * which the alias might have existed.
+                 */
+                dcache_flush();
+        }
+#endif /* CONFIG_VIRT_IDX_DCACHE */
 }
 
@@ -193 +214 @@
         }
 #endif
+#ifdef CONFIG_VIRT_IDX_DCACHE
+        if (as->dcache_flush_on_deinstall) {
+                /*
+                 * Some mappings in this address space are illegal address
+                 * aliases. Upon their creation, the flush_dcache_on_deinstall
+                 * flag was set.
+                 *
+                 * We are now obliged to flush the D-cache in order to guarantee
+                 * that there will be at most one cache line for each address
+                 * alias.
+                 *
+                 * This flush performs a cleanup after this address space. It is
+                 * necessary because other address spaces that contain the same
+                 * alias are not necessarily aware of the need to carry out the
+                 * cache flush. The only address spaces that are aware of it are
+                 * those that created the illegal alias. 
+                 */
+                dcache_flush();
+        }
+#endif /* CONFIG_VIRT_IDX_DCACHE */
 }