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 48static inline int pte_file(pte_t pte) 49{ 50 return 0; 51} 52 53#define set_pte(pteptr, pteval) (*(pteptr) = pteval) 54#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 55 56/* 57 * Page assess control based on Blackfin CPLB management 58 */ 59#define _PAGE_RD (CPLB_USER_RD) 60#define _PAGE_WR (CPLB_USER_WR) 61#define _PAGE_USER (CPLB_USER_RD | CPLB_USER_WR) 62#define _PAGE_ACCESSED CPLB_ALL_ACCESS 63#define _PAGE_DIRTY (CPLB_DIRTY) 64 65#define PTE_BIT_FUNC(fn, op) \ 66 static inline pte_t pte_##fn(pte_t _pte) { _pte.pte op; return _pte; } 67 68PTE_BIT_FUNC(rdprotect, &= ~_PAGE_RD); 69PTE_BIT_FUNC(mkread, |= _PAGE_RD); 70PTE_BIT_FUNC(wrprotect, &= ~_PAGE_WR); 71PTE_BIT_FUNC(mkwrite, |= _PAGE_WR); 72PTE_BIT_FUNC(exprotect, &= ~_PAGE_USER); 73PTE_BIT_FUNC(mkexec, |= _PAGE_USER); 74PTE_BIT_FUNC(mkclean, &= ~_PAGE_DIRTY); 75PTE_BIT_FUNC(mkdirty, |= _PAGE_DIRTY); 76PTE_BIT_FUNC(mkold, &= ~_PAGE_ACCESSED); 77PTE_BIT_FUNC(mkyoung, |= _PAGE_ACCESSED); 78 79/* 80 * ZERO_PAGE is a global shared page that is always zero: used 81 * for zero-mapped memory areas etc.. 82 */ 83#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page) 84extern char empty_zero_page[]; 85 86extern unsigned int kobjsize(const void *objp); 87 88#define swapper_pg_dir ((pgd_t *) 0) 89/* 90 * No page table caches to initialise. 91 */ 92#define pgtable_cache_init() do { } while (0) 93#define io_remap_pfn_range remap_pfn_range 94 95/* 96 * All 32bit addresses are effectively valid for vmalloc... 97 * Sort of meaningless for non-VM targets. 98 */ 99#define VMALLOC_START 0 100#define VMALLOC_END 0xffffffff 101 102/* provide a special get_unmapped_area for framebuffer mmaps of nommu */ 103extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long, 104 unsigned long, unsigned long, 105 unsigned long); 106#define HAVE_ARCH_FB_UNMAPPED_AREA 107 108#include <asm-generic/pgtable.h> 109 110#endif /* _BLACKFIN_PGTABLE_H */ 111