Changeset c520034 in mainline for kernel/arch/ia64/include/mm/page.h

Timestamp:

2011-12-31T18:19:35Z (12 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/ia64/include/mm/page.h (modified) (1 diff)

kernel/arch/ia64/include/mm/page.h

@@ -43 +43 @@
 
 /** Bit width of the TLB-locked portion of kernel address space. */
-#define KERNEL_PAGE_WIDTH  28  /* 256M */
-#define IO_PAGE_WIDTH      26  /* 64M */
-#define FW_PAGE_WIDTH      28  /* 256M */
-
-#define USPACE_IO_PAGE_WIDTH  12  /* 4K */
-
-
-/*
- * Statically mapped IO spaces - offsets to 0xe...00 of virtual addresses
- * because of "minimal virtual bits implemented is 51" it is possible to
- * have values up to 0x0007000000000000
- */
-
-/* Firmware area (bellow 4GB in phys mem) */
-#define FW_OFFSET   0x00000000F0000000
-/* Legacy IO space */
-#define IO_OFFSET   0x0001000000000000
-/* Videoram - now mapped to 0 as VGA text mode vram on 0xb8000 */
-#define VIO_OFFSET  0x0002000000000000
-
+#define KERNEL_PAGE_WIDTH       28      /* 256M */
 
 #define PPN_SHIFT  12