1#ifndef _BLACKFIN_PGTABLE_H
2#define _BLACKFIN_PGTABLE_H
3
4#include <asm-generic/4level-fixup.h>
5
6#include <asm/page.h>
7#include <asm/cplb.h>
8
9typedef pte_t *pte_addr_t;
10/*
11* Trivial page table functions.
12*/
13#define pgd_present(pgd)	(1)
14#define pgd_none(pgd)		(0)
15#define pgd_bad(pgd)		(0)
16#define pgd_clear(pgdp)
17#define kern_addr_valid(addr)	(1)
18
19#define pmd_offset(a, b)	((void *)0)
20#define pmd_none(x)		(!pmd_val(x))
21#define pmd_present(x)		(pmd_val(x))
22#define pmd_clear(xp)		do { set_pmd(xp, __pmd(0)); } while (0)
23#define pmd_bad(x)		(pmd_val(x) & ~PAGE_MASK)
24
25#define kern_addr_valid(addr) (1)
26
27#define PAGE_NONE		__pgprot(0)	/* these mean nothing to NO_MM */
28#define PAGE_SHARED		__pgprot(0)	/* these mean nothing to NO_MM */
29#define PAGE_COPY		__pgprot(0)	/* these mean nothing to NO_MM */
30#define PAGE_READONLY		__pgprot(0)	/* these mean nothing to NO_MM */
31#define PAGE_KERNEL		__pgprot(0)	/* these mean nothing to NO_MM */
32
33extern void paging_init(void);
34
35#define __swp_type(x)		(0)
36#define __swp_offset(x)		(0)
37#define __swp_entry(typ,off)	((swp_entry_t) { ((typ) | ((off) << 7)) })
38#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
39#define __swp_entry_to_pte(x)	((pte_t) { (x).val })
40
41static inline int pte_file(pte_t pte)
42{
43	return 0;
44}
45
46#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
47#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
48
49/*
50 * Page assess control based on Blackfin CPLB management
51 */
52#define _PAGE_RD	(CPLB_USER_RD)
53#define _PAGE_WR	(CPLB_USER_WR)
54#define _PAGE_USER	(CPLB_USER_RD | CPLB_USER_WR)
55#define _PAGE_ACCESSED	CPLB_ALL_ACCESS
56#define _PAGE_DIRTY	(CPLB_DIRTY)
57
58#define PTE_BIT_FUNC(fn, op) \
59	static inline pte_t pte_##fn(pte_t _pte) { _pte.pte op; return _pte; }
60
61PTE_BIT_FUNC(rdprotect, &= ~_PAGE_RD);
62PTE_BIT_FUNC(mkread, |= _PAGE_RD);
63PTE_BIT_FUNC(wrprotect, &= ~_PAGE_WR);
64PTE_BIT_FUNC(mkwrite, |= _PAGE_WR);
65PTE_BIT_FUNC(exprotect, &= ~_PAGE_USER);
66PTE_BIT_FUNC(mkexec, |= _PAGE_USER);
67PTE_BIT_FUNC(mkclean, &= ~_PAGE_DIRTY);
68PTE_BIT_FUNC(mkdirty, |= _PAGE_DIRTY);
69PTE_BIT_FUNC(mkold, &= ~_PAGE_ACCESSED);
70PTE_BIT_FUNC(mkyoung, |= _PAGE_ACCESSED);
71
72/*
73 * ZERO_PAGE is a global shared page that is always zero: used
74 * for zero-mapped memory areas etc..
75 */
76#define ZERO_PAGE(vaddr)	(virt_to_page(0))
77
78extern unsigned int kobjsize(const void *objp);
79
80#define swapper_pg_dir ((pgd_t *) 0)
81/*
82 * No page table caches to initialise.
83 */
84#define pgtable_cache_init()	do { } while (0)
85#define io_remap_pfn_range      remap_pfn_range
86
87/*
88 * All 32bit addresses are effectively valid for vmalloc...
89 * Sort of meaningless for non-VM targets.
90 */
91#define	VMALLOC_START	0
92#define	VMALLOC_END	0xffffffff
93
94#include <asm-generic/pgtable.h>
95
96#endif				/* _BLACKFIN_PGTABLE_H */
97