c898faf91b
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>
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
#ifndef _ASM_X86_PGTABLE_64_DEFS_H
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#define _ASM_X86_PGTABLE_64_DEFS_H
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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/*
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* These are used to make use of C type-checking..
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*/
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typedef unsigned long pteval_t;
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typedef unsigned long pmdval_t;
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typedef unsigned long pudval_t;
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typedef unsigned long pgdval_t;
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typedef unsigned long pgprotval_t;
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typedef struct { pteval_t pte; } pte_t;
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#endif /* !__ASSEMBLY__ */
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#define SHARED_KERNEL_PMD 0
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#define PAGETABLE_LEVELS 4
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/*
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* PGDIR_SHIFT determines what a top-level page table entry can map
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*/
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#define PGDIR_SHIFT 39
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#define PTRS_PER_PGD 512
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/*
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* 3rd level page
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*/
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#define PUD_SHIFT 30
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#define PTRS_PER_PUD 512
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/*
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* PMD_SHIFT determines the size of the area a middle-level
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* page table can map
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*/
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#define PMD_SHIFT 21
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#define PTRS_PER_PMD 512
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/*
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* entries per page directory level
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*/
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#define PTRS_PER_PTE 512
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#define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE - 1))
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#define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
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#define PUD_MASK (~(PUD_SIZE - 1))
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#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE - 1))
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/* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
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#define MAXMEM _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL)
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#define VMALLOC_START _AC(0xffffc90000000000, UL)
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#define VMALLOC_END _AC(0xffffe8ffffffffff, UL)
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#define VMEMMAP_START _AC(0xffffea0000000000, UL)
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#define MODULES_VADDR _AC(0xffffffffa0000000, UL)
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#define MODULES_END _AC(0xffffffffff000000, UL)
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#define MODULES_LEN (MODULES_END - MODULES_VADDR)
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#endif /* _ASM_X86_PGTABLE_64_DEFS_H */
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