Changeset c520034 in mainline for kernel/arch/ppc32/src/mm/page.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/arch/ppc32/src/mm/page.c (modified) (1 diff)

kernel/arch/ppc32/src/mm/page.c

@@ -46 +46 @@
 }
 
-uintptr_t hw_map(uintptr_t physaddr, size_t size)
-{
-        if (last_frame + ALIGN_UP(size, PAGE_SIZE) >
-            KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
-                panic("Unable to map physical memory %p (%zu bytes).",
-                    (void *) physaddr, size);
-        
-        uintptr_t virtaddr = PA2KA(last_frame);
-        pfn_t i;
-        page_table_lock(AS_KERNEL, true);
-        for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
-                page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i),
-                    physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE | PAGE_WRITE);
-        page_table_unlock(AS_KERNEL, true);
-        
-        last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
-        
-        return virtaddr;
-}
-
 /** @}
  */