1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_M32R_PGTABLE_2LEVEL_H
3 #define _ASM_M32R_PGTABLE_2LEVEL_H
4 #ifdef __KERNEL__
5
6 /*
7 * traditional M32R two-level paging structure:
8 */
9
10 #define PGDIR_SHIFT 22
11 #define PTRS_PER_PGD 1024
12
13 /*
14 * the M32R is two-level, so we don't really have any
15 * PMD directory physically.
16 */
17 #define __PAGETABLE_PMD_FOLDED
18 #define PMD_SHIFT 22
19 #define PTRS_PER_PMD 1
20
21 #define PTRS_PER_PTE 1024
22
23 #define pte_ERROR(e) \
24 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
25 #define pmd_ERROR(e) \
26 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
27 #define pgd_ERROR(e) \
28 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
29
30 /*
31 * The "pgd_xxx()" functions here are trivial for a folded two-level
32 * setup: the pgd is never bad, and a pmd always exists (as it's folded
33 * into the pgd entry)
34 */
pgd_none(pgd_t pgd)35 static inline int pgd_none(pgd_t pgd) { return 0; }
pgd_bad(pgd_t pgd)36 static inline int pgd_bad(pgd_t pgd) { return 0; }
pgd_present(pgd_t pgd)37 static inline int pgd_present(pgd_t pgd) { return 1; }
38 #define pgd_clear(xp) do { } while (0)
39
40 /*
41 * Certain architectures need to do special things when PTEs
42 * within a page table are directly modified. Thus, the following
43 * hook is made available.
44 */
45 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
46 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
47
48 /*
49 * (pmds are folded into pgds so this doesn't get actually called,
50 * but the define is needed for a generic inline function.)
51 */
52 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
53 #define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
54
55 #define pgd_page_vaddr(pgd) \
56 ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
57
58 #ifndef CONFIG_DISCONTIGMEM
59 #define pgd_page(pgd) (mem_map + ((pgd_val(pgd) >> PAGE_SHIFT) - PFN_BASE))
60 #endif /* !CONFIG_DISCONTIGMEM */
61
pmd_offset(pgd_t * dir,unsigned long address)62 static inline pmd_t *pmd_offset(pgd_t * dir, unsigned long address)
63 {
64 return (pmd_t *) dir;
65 }
66
67 #define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte, 0))
68 #define pte_same(a, b) (pte_val(a) == pte_val(b))
69 #define pte_page(x) pfn_to_page(pte_pfn(x))
70 #define pte_none(x) (!pte_val(x))
71 #define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT)
72 #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
73 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
74
75 #endif /* __KERNEL__ */
76 #endif /* _ASM_M32R_PGTABLE_2LEVEL_H */
77