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author | Al Viro <viro@zeniv.linux.org.uk> | 2008-08-17 19:13:17 -0400 |
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committer | H. Peter Anvin <hpa@zytor.com> | 2008-10-22 22:55:19 -0700 |
commit | 8ede0bdb63305d3353efd97e9af6210afb05734e (patch) | |
tree | a9500a323d0a2dcadca43c23b5c20186f6d9b724 /arch/um/include/asm/pgtable-2level.h | |
parent | 8569c9140bd41089f9b6be8837ca421102714a90 (diff) | |
download | linux-8ede0bdb63305d3353efd97e9af6210afb05734e.tar.gz linux-8ede0bdb63305d3353efd97e9af6210afb05734e.tar.bz2 linux-8ede0bdb63305d3353efd97e9af6210afb05734e.zip |
x86, um: initial part of asm-um move
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/um/include/asm/pgtable-2level.h')
-rw-r--r-- | arch/um/include/asm/pgtable-2level.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/um/include/asm/pgtable-2level.h b/arch/um/include/asm/pgtable-2level.h new file mode 100644 index 000000000000..f534b73e753e --- /dev/null +++ b/arch/um/include/asm/pgtable-2level.h @@ -0,0 +1,53 @@ +/* + * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) + * Copyright 2003 PathScale, Inc. + * Derived from include/asm-i386/pgtable.h + * Licensed under the GPL + */ + +#ifndef __UM_PGTABLE_2LEVEL_H +#define __UM_PGTABLE_2LEVEL_H + +#include <asm-generic/pgtable-nopmd.h> + +/* PGDIR_SHIFT determines what a third-level page table entry can map */ + +#define PGDIR_SHIFT 22 +#define PGDIR_SIZE (1UL << PGDIR_SHIFT) +#define PGDIR_MASK (~(PGDIR_SIZE-1)) + +/* + * entries per page directory level: the i386 is two-level, so + * we don't really have any PMD directory physically. + */ +#define PTRS_PER_PTE 1024 +#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE) +#define PTRS_PER_PGD 1024 +#define FIRST_USER_ADDRESS 0 + +#define pte_ERROR(e) \ + printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \ + pte_val(e)) +#define pgd_ERROR(e) \ + printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \ + pgd_val(e)) + +static inline int pgd_newpage(pgd_t pgd) { return 0; } +static inline void pgd_mkuptodate(pgd_t pgd) { } + +#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval)) + +#define pte_pfn(x) phys_to_pfn(pte_val(x)) +#define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot)) +#define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot)) + +/* + * Bits 0 through 4 are taken + */ +#define PTE_FILE_MAX_BITS 27 + +#define pte_to_pgoff(pte) (pte_val(pte) >> 5) + +#define pgoff_to_pte(off) ((pte_t) { ((off) << 5) + _PAGE_FILE }) + +#endif |