Changeset c520034 in mainline for kernel/generic/src/mm/reserve.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/generic/src/mm/reserve.c (modified) (5 diffs)

kernel/generic/src/mm/reserve.c

@@ -42 +42 @@
 #include <typedefs.h>
 #include <arch/types.h>
+#include <debug.h>
+
+static bool reserve_initialized = false;
 
 IRQ_SPINLOCK_STATIC_INITIALIZE_NAME(reserve_lock, "reserve_lock");
@@ -54 +57 @@
 {
         reserve = frame_total_free_get();
+        reserve_initialized = true;
 }
 
@@ -67 +71 @@
 {
         bool reserved = false;
+
+        ASSERT(reserve_initialized);
 
         irq_spinlock_lock(&reserve_lock, true);
@@ -111 +117 @@
 void reserve_force_alloc(size_t size)
 {
+        if (!reserve_initialized)
+                return;
+
         irq_spinlock_lock(&reserve_lock, true);
         reserve -= size;
@@ -122 +131 @@
 void reserve_free(size_t size)
 {
+        if (!reserve_initialized)
+                return;
+
         irq_spinlock_lock(&reserve_lock, true);
         reserve += size;