Changeset c520034 in mainline for kernel/genarch/src/mm/page_ht.c

Timestamp:

2011-12-31T18:19:35Z (13 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

295f658, 77c2b02, 96cd5b4

Parents:

852052d (diff), 22f0561 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Support for kernel non-identity mappings, phase I.

• identity/non-identity kernel memory split on all architectures
• low/high physical memory split on all architectures
• frame allocator understands low/high memory
• high physical memory currently unused (Phase II)
• more compact frame_t
• zone conf frames, pte_t, kernel stacks allocated from low memory
• lockless TLB-miss handlers everywhere (newly sparc64, ia64)
• preallocate PTL1 page tables for non-identity and prevent their deallocation
• hw_map() unification
• new resource allocator used for allocating kernel virtual addresses

Breakage:

• sparc64/sun4v creates too large kernel identity; not fixed because of lack of testing hw
• ppc32's tlb_refill() seems wrong as it creates too large kernel identity, but appears unused and the architecture works normally

Not implemented yet (phase II):

• allow high memory to be used for common kernel allocations

File:

• kernel/genarch/src/mm/page_ht.c (modified) (5 diffs)

kernel/genarch/src/mm/page_ht.c

@@ -59 +59 @@
 static void ht_mapping_remove(as_t *, uintptr_t);
 static pte_t *ht_mapping_find(as_t *, uintptr_t, bool);
+static void ht_mapping_make_global(uintptr_t, size_t);
+
+slab_cache_t *pte_cache = NULL;
 
 /**
@@ -86 +89 @@
         .mapping_insert = ht_mapping_insert,
         .mapping_remove = ht_mapping_remove,
-        .mapping_find = ht_mapping_find
+        .mapping_find = ht_mapping_find,
+        .mapping_make_global = ht_mapping_make_global
 };
 
@@ -163 +167 @@
         pte_t *pte = hash_table_get_instance(item, pte_t, link);
         
-        free(pte);
+        slab_free(pte_cache, pte);
 }
 
@@ -188 +192 @@
         
         if (!hash_table_find(&page_ht, key)) {
-                pte_t *pte = (pte_t *) malloc(sizeof(pte_t), FRAME_ATOMIC);
+                pte_t *pte = slab_alloc(pte_cache, FRAME_LOWMEM | FRAME_ATOMIC);
                 ASSERT(pte != NULL);
                 
@@ -260 +264 @@
 }
 
+void ht_mapping_make_global(uintptr_t base, size_t size)
+{
+        /* nothing to do */
+}
+
 /** @}
  */