Changeset c520034 in mainline for kernel/arch/mips32/include/mm/as.h

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/arch/mips32/include/mm/as.h (modified) (1 diff)

kernel/arch/mips32/include/mm/as.h

@@ -39 +39 @@
 
 #define KERNEL_ADDRESS_SPACE_START_ARCH  UINT32_C(0x80000000)
-#define KERNEL_ADDRESS_SPACE_END_ARCH    UINT32_C(0x9fffffff)
+#define KERNEL_ADDRESS_SPACE_END_ARCH    UINT32_C(0xffffffff)
 #define USER_ADDRESS_SPACE_START_ARCH    UINT32_C(0x00000000)
 #define USER_ADDRESS_SPACE_END_ARCH      UINT32_C(0x7fffffff)