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x86: 46 bit physical address support on 64 bits

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Extend the maximum addressable memory on x86-64 from 2^44 to
2^46 bytes. This requires some shuffling around of the vmalloc
and virtual memmap memory areas, to keep them away from the
direct mapping of up to 64TB of physical memory.

This patch also introduces a guard hole between the vmalloc
area and the virtual memory map space.  There's really no
good reason why we wouldn't have a guard hole there.

[ Impact: future hardware enablement ]

Signed-off-by: Rik van Riel <riel@redhat.com>
LKML-Reference: <20090505172856.6820db22@cuia.bos.redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Rik van Riel
2009-05-05 17:28:56 -04:00
committed by H. Peter Anvin
parent a454ab3110
commit c898faf91b
4 changed files with 11 additions and 10 deletions
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2
arch/x86/include/asm/sparsemem.h
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@@ -27,7 +27,7 @@
#else /* CONFIG_X86_32 */
# define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */
# define MAX_PHYSADDR_BITS 44
# define MAX_PHYSMEM_BITS 44 /* Can be max 45 bits */
# define MAX_PHYSMEM_BITS 46
#endif
#endif /* CONFIG_SPARSEMEM */