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07037db5 PD |
1 | /* |
2 | * Copyright (C) 2012 Regents of the University of California | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation, version 2. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #ifndef _ASM_RISCV_PGTABLE_64_H | |
15 | #define _ASM_RISCV_PGTABLE_64_H | |
16 | ||
17 | #include <linux/const.h> | |
18 | ||
19 | #define PGDIR_SHIFT 30 | |
20 | /* Size of region mapped by a page global directory */ | |
21 | #define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT) | |
22 | #define PGDIR_MASK (~(PGDIR_SIZE - 1)) | |
23 | ||
24 | #define PMD_SHIFT 21 | |
25 | /* Size of region mapped by a page middle directory */ | |
26 | #define PMD_SIZE (_AC(1, UL) << PMD_SHIFT) | |
27 | #define PMD_MASK (~(PMD_SIZE - 1)) | |
28 | ||
29 | /* Page Middle Directory entry */ | |
30 | typedef struct { | |
31 | unsigned long pmd; | |
32 | } pmd_t; | |
33 | ||
34 | #define pmd_val(x) ((x).pmd) | |
35 | #define __pmd(x) ((pmd_t) { (x) }) | |
36 | ||
37 | #define PTRS_PER_PMD (PAGE_SIZE / sizeof(pmd_t)) | |
38 | ||
39 | static inline int pud_present(pud_t pud) | |
40 | { | |
41 | return (pud_val(pud) & _PAGE_PRESENT); | |
42 | } | |
43 | ||
44 | static inline int pud_none(pud_t pud) | |
45 | { | |
46 | return (pud_val(pud) == 0); | |
47 | } | |
48 | ||
49 | static inline int pud_bad(pud_t pud) | |
50 | { | |
51 | return !pud_present(pud); | |
52 | } | |
53 | ||
54 | static inline void set_pud(pud_t *pudp, pud_t pud) | |
55 | { | |
56 | *pudp = pud; | |
57 | } | |
58 | ||
59 | static inline void pud_clear(pud_t *pudp) | |
60 | { | |
61 | set_pud(pudp, __pud(0)); | |
62 | } | |
63 | ||
64 | static inline unsigned long pud_page_vaddr(pud_t pud) | |
65 | { | |
66 | return (unsigned long)pfn_to_virt(pud_val(pud) >> _PAGE_PFN_SHIFT); | |
67 | } | |
68 | ||
69 | #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) | |
70 | ||
71 | static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) | |
72 | { | |
73 | return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr); | |
74 | } | |
75 | ||
76 | static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot) | |
77 | { | |
78 | return __pmd((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot)); | |
79 | } | |
80 | ||
81 | #define pmd_ERROR(e) \ | |
82 | pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) | |
83 | ||
84 | #endif /* _ASM_RISCV_PGTABLE_64_H */ |