1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2012 Regents of the University of California
4  */
5 
6 #ifndef _ASM_RISCV_PGTABLE_64_H
7 #define _ASM_RISCV_PGTABLE_64_H
8 
9 #include <linux/const.h>
10 
11 #define PGDIR_SHIFT     30
12 /* Size of region mapped by a page global directory */
13 #define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
14 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
15 
16 #define PMD_SHIFT       21
17 /* Size of region mapped by a page middle directory */
18 #define PMD_SIZE        (_AC(1, UL) << PMD_SHIFT)
19 #define PMD_MASK        (~(PMD_SIZE - 1))
20 
21 /* Page Middle Directory entry */
22 typedef struct {
23 	unsigned long pmd;
24 } pmd_t;
25 
26 #define pmd_val(x)      ((x).pmd)
27 #define __pmd(x)        ((pmd_t) { (x) })
28 
29 #define PTRS_PER_PMD    (PAGE_SIZE / sizeof(pmd_t))
30 
31 static inline int pud_present(pud_t pud)
32 {
33 	return (pud_val(pud) & _PAGE_PRESENT);
34 }
35 
36 static inline int pud_none(pud_t pud)
37 {
38 	return (pud_val(pud) == 0);
39 }
40 
41 static inline int pud_bad(pud_t pud)
42 {
43 	return !pud_present(pud);
44 }
45 
46 static inline void set_pud(pud_t *pudp, pud_t pud)
47 {
48 	*pudp = pud;
49 }
50 
51 static inline void pud_clear(pud_t *pudp)
52 {
53 	set_pud(pudp, __pud(0));
54 }
55 
56 static inline unsigned long pud_page_vaddr(pud_t pud)
57 {
58 	return (unsigned long)pfn_to_virt(pud_val(pud) >> _PAGE_PFN_SHIFT);
59 }
60 
61 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
62 
63 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
64 {
65 	return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr);
66 }
67 
68 static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot)
69 {
70 	return __pmd((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
71 }
72 
73 static inline unsigned long _pmd_pfn(pmd_t pmd)
74 {
75 	return pmd_val(pmd) >> _PAGE_PFN_SHIFT;
76 }
77 
78 #define pmd_ERROR(e) \
79 	pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
80 
81 #endif /* _ASM_RISCV_PGTABLE_64_H */
82