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 #include <asm-generic/pgtable.h> 101 102 #endif /* _BLACKFIN_PGTABLE_H */ 103