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 struct {
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