1 /* 2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 #ifndef __ASM_ARC_PAGE_H 9 #define __ASM_ARC_PAGE_H 10 11 #include <uapi/asm/page.h> 12 13 14 #ifndef __ASSEMBLY__ 15 16 #define get_user_page(vaddr) __get_free_page(GFP_KERNEL) 17 #define free_user_page(page, addr) free_page(addr) 18 19 #define clear_page(paddr) memset((paddr), 0, PAGE_SIZE) 20 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 21 22 #ifndef CONFIG_ARC_CACHE_VIPT_ALIASING 23 24 #define clear_user_page(addr, vaddr, pg) clear_page(addr) 25 #define copy_user_page(vto, vfrom, vaddr, pg) copy_page(vto, vfrom) 26 27 #else /* VIPT aliasing dcache */ 28 29 struct vm_area_struct; 30 struct page; 31 32 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 33 34 void copy_user_highpage(struct page *to, struct page *from, 35 unsigned long u_vaddr, struct vm_area_struct *vma); 36 void clear_user_page(void *to, unsigned long u_vaddr, struct page *page); 37 38 #endif /* CONFIG_ARC_CACHE_VIPT_ALIASING */ 39 40 #undef STRICT_MM_TYPECHECKS 41 42 #ifdef STRICT_MM_TYPECHECKS 43 /* 44 * These are used to make use of C type-checking.. 45 */ 46 typedef struct { 47 unsigned long pte; 48 } pte_t; 49 typedef struct { 50 unsigned long pgd; 51 } pgd_t; 52 typedef struct { 53 unsigned long pgprot; 54 } pgprot_t; 55 typedef unsigned long pgtable_t; 56 57 #define pte_val(x) ((x).pte) 58 #define pgd_val(x) ((x).pgd) 59 #define pgprot_val(x) ((x).pgprot) 60 61 #define __pte(x) ((pte_t) { (x) }) 62 #define __pgd(x) ((pgd_t) { (x) }) 63 #define __pgprot(x) ((pgprot_t) { (x) }) 64 65 #define pte_pgprot(x) __pgprot(pte_val(x)) 66 67 #else /* !STRICT_MM_TYPECHECKS */ 68 69 typedef unsigned long pte_t; 70 typedef unsigned long pgd_t; 71 typedef unsigned long pgprot_t; 72 typedef unsigned long pgtable_t; 73 74 #define pte_val(x) (x) 75 #define pgd_val(x) (x) 76 #define pgprot_val(x) (x) 77 #define __pte(x) (x) 78 #define __pgprot(x) (x) 79 #define pte_pgprot(x) (x) 80 81 #endif 82 83 #define ARCH_PFN_OFFSET (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT) 84 85 #define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr) 86 87 /* 88 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them) 89 * 90 * These macros have historically been misnamed 91 * virt here means link-address/program-address as embedded in object code. 92 * So if kernel img is linked at 0x8000_0000 onwards, 0x8010_0000 will be 93 * 128th page, and virt_to_page( ) will return the struct page corresp to it. 94 * mem_map[ ] is an array of struct page for each page frame in the system 95 * 96 * Independent of where linux is linked at, link-addr = physical address 97 * So the old macro __pa = vaddr + PAGE_OFFSET - CONFIG_LINUX_LINK_BASE 98 * would have been wrong in case kernel is not at 0x8zs 99 */ 100 #define __pa(vaddr) ((unsigned long)vaddr) 101 #define __va(paddr) ((void *)((unsigned long)(paddr))) 102 103 #define virt_to_page(kaddr) \ 104 (mem_map + ((__pa(kaddr) - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT)) 105 106 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 107 108 /* Default Permissions for page, used in mmap.c */ 109 #ifdef CONFIG_ARC_STACK_NONEXEC 110 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE) 111 #else 112 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 113 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 114 #endif 115 116 #define WANT_PAGE_VIRTUAL 1 117 118 #include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */ 119 #include <asm-generic/getorder.h> 120 121 #endif /* !__ASSEMBLY__ */ 122 123 #endif 124