diff options
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 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) | ||
3 | * Copyright 2003 PathScale, Inc. | ||
4 | * Derived from include/asm-i386/pgtable.h | ||
5 | * Licensed under the GPL | ||
6 | */ | ||
7 | |||
8 | #ifndef __UM_PGTABLE_2LEVEL_H | ||
9 | #define __UM_PGTABLE_2LEVEL_H | ||
10 | |||
11 | #include <asm-generic/pgtable-nopmd.h> | ||
12 | |||
13 | /* PGDIR_SHIFT determines what a third-level page table entry can map */ | ||
14 | |||
15 | #define PGDIR_SHIFT 22 | ||
16 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) | ||
17 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) | ||
18 | |||
19 | /* | ||
20 | * entries per page directory level: the i386 is two-level, so | ||
21 | * we don't really have any PMD directory physically. | ||
22 | */ | ||
23 | #define PTRS_PER_PTE 1024 | ||
24 | #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE) | ||
25 | #define PTRS_PER_PGD 1024 | ||
26 | #define FIRST_USER_ADDRESS 0 | ||
27 | |||
28 | #define pte_ERROR(e) \ | ||
29 | printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \ | ||
30 | pte_val(e)) | ||
31 | #define pgd_ERROR(e) \ | ||
32 | printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \ | ||
33 | pgd_val(e)) | ||
34 | |||
35 | static inline int pgd_newpage(pgd_t pgd) { return 0; } | ||
36 | static inline void pgd_mkuptodate(pgd_t pgd) { } | ||
37 | |||
38 | #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval)) | ||
39 | |||
40 | #define pte_pfn(x) phys_to_pfn(pte_val(x)) | ||
41 | #define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot)) | ||
42 | #define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot)) | ||
43 | |||
44 | /* | ||
45 | * Bits 0 through 4 are taken | ||
46 | */ | ||
47 | #define PTE_FILE_MAX_BITS 27 | ||
48 | |||
49 | #define pte_to_pgoff(pte) (pte_val(pte) >> 5) | ||
50 | |||
51 | #define pgoff_to_pte(off) ((pte_t) { ((off) << 5) + _PAGE_FILE }) | ||
52 | |||
53 | #endif | ||