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Linux/arch/blackfin/include/asm/pgtable.h

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  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 
 15 typedef 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 
 40 extern 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 
 63 PTE_BIT_FUNC(rdprotect, &= ~_PAGE_RD);
 64 PTE_BIT_FUNC(mkread, |= _PAGE_RD);
 65 PTE_BIT_FUNC(wrprotect, &= ~_PAGE_WR);
 66 PTE_BIT_FUNC(mkwrite, |= _PAGE_WR);
 67 PTE_BIT_FUNC(exprotect, &= ~_PAGE_USER);
 68 PTE_BIT_FUNC(mkexec, |= _PAGE_USER);
 69 PTE_BIT_FUNC(mkclean, &= ~_PAGE_DIRTY);
 70 PTE_BIT_FUNC(mkdirty, |= _PAGE_DIRTY);
 71 PTE_BIT_FUNC(mkold, &= ~_PAGE_ACCESSED);
 72 PTE_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)
 79 extern 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 */
 95 extern 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 #define pgprot_writecombine pgprot_noncached
101 
102 #include <asm-generic/pgtable.h>
103 
104 #endif                          /* _BLACKFIN_PGTABLE_H */
105 

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