1/*
2 * Copyright 2004-2009 Analog Devices Inc.
3 *
4 * Licensed under the GPL-2 or later.
5 */
6
7#ifndef _BLACKFIN_PGTABLE_H
8#define _BLACKFIN_PGTABLE_H
9
10#include <asm-generic/4level-fixup.h>
11
12#include <asm/page.h>
13#include <asm/def_LPBlackfin.h>
14
15typedef pte_t *pte_addr_t;
16/*
17* Trivial page table functions.
18*/
19#define pgd_present(pgd)	(1)
20#define pgd_none(pgd)		(0)
21#define pgd_bad(pgd)		(0)
22#define pgd_clear(pgdp)
23#define kern_addr_valid(addr)	(1)
24
25#define pmd_offset(a, b)	((void *)0)
26#define pmd_none(x)		(!pmd_val(x))
27#define pmd_present(x)		(pmd_val(x))
28#define pmd_clear(xp)		do { set_pmd(xp, __pmd(0)); } while (0)
29#define pmd_bad(x)		(pmd_val(x) & ~PAGE_MASK)
30
31#define kern_addr_valid(addr) (1)
32
33#define PAGE_NONE		__pgprot(0)	/* these mean nothing to NO_MM */
34#define PAGE_SHARED		__pgprot(0)	/* these mean nothing to NO_MM */
35#define PAGE_COPY		__pgprot(0)	/* these mean nothing to NO_MM */
36#define PAGE_READONLY		__pgprot(0)	/* these mean nothing to NO_MM */
37#define PAGE_KERNEL		__pgprot(0)	/* these mean nothing to NO_MM */
38#define pgprot_noncached(prot)	(prot)
39
40extern void paging_init(void);
41
42#define __swp_type(x)		(0)
43#define __swp_offset(x)		(0)
44#define __swp_entry(typ,off)	((swp_entry_t) { ((typ) | ((off) << 7)) })
45#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
46#define __swp_entry_to_pte(x)	((pte_t) { (x).val })
47
48#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
49#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
50
51/*
52 * Page assess control based on Blackfin CPLB management
53 */
54#define _PAGE_RD	(CPLB_USER_RD)
55#define _PAGE_WR	(CPLB_USER_WR)
56#define _PAGE_USER	(CPLB_USER_RD | CPLB_USER_WR)
57#define _PAGE_ACCESSED	CPLB_ALL_ACCESS
58#define _PAGE_DIRTY	(CPLB_DIRTY)
59
60#define PTE_BIT_FUNC(fn, op) \
61	static inline pte_t pte_##fn(pte_t _pte) { _pte.pte op; return _pte; }
62
63PTE_BIT_FUNC(rdprotect, &= ~_PAGE_RD);
64PTE_BIT_FUNC(mkread, |= _PAGE_RD);
65PTE_BIT_FUNC(wrprotect, &= ~_PAGE_WR);
66PTE_BIT_FUNC(mkwrite, |= _PAGE_WR);
67PTE_BIT_FUNC(exprotect, &= ~_PAGE_USER);
68PTE_BIT_FUNC(mkexec, |= _PAGE_USER);
69PTE_BIT_FUNC(mkclean, &= ~_PAGE_DIRTY);
70PTE_BIT_FUNC(mkdirty, |= _PAGE_DIRTY);
71PTE_BIT_FUNC(mkold, &= ~_PAGE_ACCESSED);
72PTE_BIT_FUNC(mkyoung, |= _PAGE_ACCESSED);
73
74/*
75 * ZERO_PAGE is a global shared page that is always zero: used
76 * for zero-mapped memory areas etc..
77 */
78#define ZERO_PAGE(vaddr)	virt_to_page(empty_zero_page)
79extern char empty_zero_page[];
80
81#define swapper_pg_dir ((pgd_t *) 0)
82/*
83 * No page table caches to initialise.
84 */
85#define pgtable_cache_init()	do { } while (0)
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/* provide a special get_unmapped_area for framebuffer mmaps of nommu */
95extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long,
96					  unsigned long, unsigned long,
97					  unsigned long);
98#define HAVE_ARCH_FB_UNMAPPED_AREA
99
100#include <asm-generic/pgtable.h>
101
102#endif				/* _BLACKFIN_PGTABLE_H */
103