1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_NOHASH_64_PGTABLE_4K_H
3 #define _ASM_POWERPC_NOHASH_64_PGTABLE_4K_H
4
5 #include <asm-generic/pgtable-nop4d.h>
6
7 /*
8 * Entries per page directory level. The PTE level must use a 64b record
9 * for each page table entry. The PMD and PGD level use a 32b record for
10 * each entry by assuming that each entry is page aligned.
11 */
12 #define PTE_INDEX_SIZE 9
13 #define PMD_INDEX_SIZE 7
14 #define PUD_INDEX_SIZE 9
15 #define PGD_INDEX_SIZE 9
16
17 #ifndef __ASSEMBLY__
18 #define PTE_TABLE_SIZE (sizeof(pte_t) << PTE_INDEX_SIZE)
19 #define PMD_TABLE_SIZE (sizeof(pmd_t) << PMD_INDEX_SIZE)
20 #define PUD_TABLE_SIZE (sizeof(pud_t) << PUD_INDEX_SIZE)
21 #define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE)
22 #endif /* __ASSEMBLY__ */
23
24 #define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
25 #define PTRS_PER_PMD (1 << PMD_INDEX_SIZE)
26 #define PTRS_PER_PUD (1 << PUD_INDEX_SIZE)
27 #define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)
28
29 /* PMD_SHIFT determines what a second-level page table entry can map */
30 #define PMD_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE)
31 #define PMD_SIZE (1UL << PMD_SHIFT)
32 #define PMD_MASK (~(PMD_SIZE-1))
33
34 /* PUD_SHIFT determines what a third-level page table entry can map */
35 #define PUD_SHIFT (PMD_SHIFT + PMD_INDEX_SIZE)
36 #define PUD_SIZE (1UL << PUD_SHIFT)
37 #define PUD_MASK (~(PUD_SIZE-1))
38
39 /* PGDIR_SHIFT determines what a fourth-level page table entry can map */
40 #define PGDIR_SHIFT (PUD_SHIFT + PUD_INDEX_SIZE)
41 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
42 #define PGDIR_MASK (~(PGDIR_SIZE-1))
43
44 /* Bits to mask out from a PMD to get to the PTE page */
45 #define PMD_MASKED_BITS 0
46 /* Bits to mask out from a PUD to get to the PMD page */
47 #define PUD_MASKED_BITS 0
48 /* Bits to mask out from a P4D to get to the PUD page */
49 #define P4D_MASKED_BITS 0
50
51
52 /*
53 * 4-level page tables related bits
54 */
55
56 #define p4d_none(p4d) (!p4d_val(p4d))
57 #define p4d_bad(p4d) (p4d_val(p4d) == 0)
58 #define p4d_present(p4d) (p4d_val(p4d) != 0)
59
60 #ifndef __ASSEMBLY__
61
62 static inline pud_t *p4d_pgtable(p4d_t p4d)
63 {
64 return (pud_t *) (p4d_val(p4d) & ~P4D_MASKED_BITS);
65 }
66
67 static inline void p4d_clear(p4d_t *p4dp)
68 {
69 *p4dp = __p4d(0);
70 }
71
72 static inline pte_t p4d_pte(p4d_t p4d)
73 {
74 return __pte(p4d_val(p4d));
75 }
76
77 static inline p4d_t pte_p4d(pte_t pte)
78 {
79 return __p4d(pte_val(pte));
80 }
81 extern struct page *p4d_page(p4d_t p4d);
82
83 #endif /* !__ASSEMBLY__ */
84
85 #define pud_ERROR(e) \
86 pr_err("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pud_val(e))
87
88 /*
89 * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range() */
90 #define remap_4k_pfn(vma, addr, pfn, prot) \
91 remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot))
92
93 #endif /* _ _ASM_POWERPC_NOHASH_64_PGTABLE_4K_H */
94
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