1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_PGTABLE_3LEVEL_H
3 #define __ASM_SH_PGTABLE_3LEVEL_H
4
5 #include <asm-generic/pgtable-nopud.h>
6
7 /*
8 * Some cores need a 3-level page table layout, for example when using
9 * 64-bit PTEs and 4K pages.
10 */
11 #define PAGETABLE_LEVELS 3
12
13 #define PTE_MAGNITUDE 3 /* 64-bit PTEs on SH-X2 TLB */
14
15 /* PGD bits */
16 #define PGDIR_SHIFT 30
17
18 #define PTRS_PER_PGD 4
19 #define USER_PTRS_PER_PGD 2
20
21 /* PMD bits */
22 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTE_MAGNITUDE))
23 #define PMD_SIZE (1UL << PMD_SHIFT)
24 #define PMD_MASK (~(PMD_SIZE-1))
25
26 #define PTRS_PER_PMD ((1 << PGDIR_SHIFT) / PMD_SIZE)
27
28 #define pmd_ERROR(e) \
29 printk("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e))
30
31 typedef union {
32 struct {
33 unsigned long pmd_low;
34 unsigned long pmd_high;
35 };
36 unsigned long long pmd;
37 } pmd_t;
38 #define pmd_val(x) ((x).pmd)
39 #define __pmd(x) ((pmd_t) { .pmd = (x) } )
40
41 static inline pmd_t *pud_pgtable(pud_t pud)
42 {
43 return (pmd_t *)(unsigned long)pud_val(pud);
44 }
45
46 /* only used by the stubbed out hugetlb gup code, should never be called */
47 #define pud_page(pud) NULL
48 #define pud_none(x) (!pud_val(x))
49 #define pud_present(x) (pud_val(x))
50 #define pud_clear(xp) do { set_pud(xp, __pud(0)); } while (0)
51 #define pud_bad(x) (pud_val(x) & ~PAGE_MASK)
52
53 /*
54 * (puds are folded into pgds so this doesn't get actually called,
55 * but the define is needed for a generic inline function.)
56 */
57 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
58
59 #endif /* __ASM_SH_PGTABLE_3LEVEL_H */
60
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