Changeset 8dbc18c in mainline

Timestamp:

2007-01-21T16:46:46Z (18 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

f429331

Parents:

718d600

Message:

When invalidating entire TLBs on sparc64, make sure to also invalidate any (locked) global entries.
This fixes Ticket #21.
Fix a comment in start.S stating that the kernel installs a global entry for itself. All entries installed by the kernel
are local to some memory context.

Location:

kernel/arch/sparc64/src

Files:

• mm/tlb.c (modified) (3 diffs)
• start.S (modified) (1 diff)

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

@@ -328 +328 @@
                 d.value = itlb_data_access_read(i);
                 t.value = itlb_tag_read_read(i);
-                
+
                 printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, "
                         "ie=%d, soft2=%#x, diag=%#x, pfn=%#x, soft=%#x, l=%d, "
@@ -409 +409 @@
         tlb_tag_read_reg_t t;
 
+        /*
+         * Walk all ITLB and DTLB entries and remove all unlocked mappings.
+         *
+         * The kernel doesn't use global mappings so any locked global mappings
+         * found  must have been created by someone else. Their only purpose now
+         * is to collide with proper mappings. Invalidate immediately. It should
+         * be safe to invalidate them as late as now.
+         */
+
         for (i = 0; i < ITLB_ENTRY_COUNT; i++) {
                 d.value = itlb_data_access_read(i);
-                if (!d.l) {
+                if (!d.l || d.g) {
                         t.value = itlb_tag_read_read(i);
                         d.v = false;
@@ -421 +430 @@
         for (i = 0; i < DTLB_ENTRY_COUNT; i++) {
                 d.value = dtlb_data_access_read(i);
-                if (!d.l) {
+                if (!d.l || d.g) {
                         t.value = dtlb_tag_read_read(i);
                         d.v = false;

kernel/arch/sparc64/src/start.S

@@ -100 +100 @@
 
         /* 
-         * Take over the DMMU by installing global locked TTE entry identically
+         * Take over the DMMU by installing locked TTE entry identically
          * mapping the first 4M of memory.
          *