Changeset 2057572 in mainline for kernel/generic/src/mm/backend_anon.c

Timestamp:

2007-03-27T23:40:25Z (18 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

399ece9

Parents:

8d37a06

Message:

The Ultimate Solution To Illegal Virtual Aliases.
It is better to avoid them completely than to fight them.
Switch the sparc64 port to 16K pages. The TLBs and TSBs
continue to operate with 8K pages only. Page tables and
other generic parts operate with 16K pages.

Because the MMU doesn't support 16K directly, each 16K
page is emulated by a pair of 8K pages. With 16K pages,
illegal aliases cannot be created in 16K D-cache.

File:

• kernel/generic/src/mm/backend_anon.c (modified) (2 diffs)

kernel/generic/src/mm/backend_anon.c

@@ -158 +158 @@
                 panic("Could not insert used space.\n");
                 
-#ifdef CONFIG_VIRT_IDX_DCACHE
-        if (dirty && PAGE_COLOR(PA2KA(frame)) != PAGE_COLOR(addr)) {
-                /*
-                 * By writing to the frame using kernel virtual address,
-                 * we have created an illegal virtual alias. We now have to
-                 * invalidate cachelines belonging to addr on all processors
-                 * so that they will be reloaded with the new content on next
-                 * read.
-                 */
-                dcache_flush_frame(addr, frame);
-                dcache_shootdown_start(DCACHE_INVL_FRAME, PAGE_COLOR(addr), frame);
-                dcache_shootdown_finalize();
-        }
-#endif
-
         return AS_PF_OK;
 }
@@ -241 +226 @@
 /** @}
  */
-