1 #ifndef __ASM_SH_PGTABLE_3LEVEL_H
2 #define __ASM_SH_PGTABLE_3LEVEL_H
3 
4 #include <asm-generic/pgtable-nopud.h>
5 
6 /*
7  * Some cores need a 3-level page table layout, for example when using
8  * 64-bit PTEs and 4K pages.
9  */
10 #define PAGETABLE_LEVELS	3
11 
12 #define PTE_MAGNITUDE		3	/* 64-bit PTEs on SH-X2 TLB */
13 
14 /* PGD bits */
15 #define PGDIR_SHIFT		30
16 
17 #define PTRS_PER_PGD		4
18 #define USER_PTRS_PER_PGD	2
19 
20 /* PMD bits */
21 #define PMD_SHIFT	(PAGE_SHIFT + (PAGE_SHIFT - PTE_MAGNITUDE))
22 #define PMD_SIZE	(1UL << PMD_SHIFT)
23 #define PMD_MASK	(~(PMD_SIZE-1))
24 
25 #define PTRS_PER_PMD	((1 << PGDIR_SHIFT) / PMD_SIZE)
26 
27 #define pmd_ERROR(e) \
28 	printk("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e))
29 
30 typedef struct { unsigned long long pmd; } pmd_t;
31 #define pmd_val(x)	((x).pmd)
32 #define __pmd(x)	((pmd_t) { (x) } )
33 
34 static inline unsigned long pud_page_vaddr(pud_t pud)
35 {
36 	return pud_val(pud);
37 }
38 
39 #define pmd_index(address)	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
40 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
41 {
42 	return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
43 }
44 
45 #define pud_none(x)	(!pud_val(x))
46 #define pud_present(x)	(pud_val(x))
47 #define pud_clear(xp)	do { set_pud(xp, __pud(0)); } while (0)
48 #define	pud_bad(x)	(pud_val(x) & ~PAGE_MASK)
49 
50 /*
51  * (puds are folded into pgds so this doesn't get actually called,
52  * but the define is needed for a generic inline function.)
53  */
54 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
55 
56 #endif /* __ASM_SH_PGTABLE_3LEVEL_H */
57