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 clear_page(paddr) memset((paddr), 0, PAGE_SIZE) 17 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 18 19 struct vm_area_struct; 20 struct page; 21 22 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 23 24 void copy_user_highpage(struct page *to, struct page *from, 25 unsigned long u_vaddr, struct vm_area_struct *vma); 26 void clear_user_page(void *to, unsigned long u_vaddr, struct page *page); 27 28 #undef STRICT_MM_TYPECHECKS 29 30 #ifdef STRICT_MM_TYPECHECKS 31 /* 32 * These are used to make use of C type-checking.. 33 */ 34 typedef struct { 35 unsigned long pte; 36 } pte_t; 37 typedef struct { 38 unsigned long pgd; 39 } pgd_t; 40 typedef struct { 41 unsigned long pgprot; 42 } pgprot_t; 43 44 #define pte_val(x) ((x).pte) 45 #define pgd_val(x) ((x).pgd) 46 #define pgprot_val(x) ((x).pgprot) 47 48 #define __pte(x) ((pte_t) { (x) }) 49 #define __pgd(x) ((pgd_t) { (x) }) 50 #define __pgprot(x) ((pgprot_t) { (x) }) 51 52 #define pte_pgprot(x) __pgprot(pte_val(x)) 53 54 #else /* !STRICT_MM_TYPECHECKS */ 55 56 #ifdef CONFIG_ARC_HAS_PAE40 57 typedef unsigned long long pte_t; 58 #else 59 typedef unsigned long pte_t; 60 #endif 61 typedef unsigned long pgd_t; 62 typedef unsigned long pgprot_t; 63 64 #define pte_val(x) (x) 65 #define pgd_val(x) (x) 66 #define pgprot_val(x) (x) 67 #define __pte(x) (x) 68 #define __pgd(x) (x) 69 #define __pgprot(x) (x) 70 #define pte_pgprot(x) (x) 71 72 #endif 73 74 typedef pte_t * pgtable_t; 75 76 #define ARCH_PFN_OFFSET (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT) 77 78 #define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr) 79 80 /* 81 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them) 82 * 83 * These macros have historically been misnamed 84 * virt here means link-address/program-address as embedded in object code. 85 * So if kernel img is linked at 0x8000_0000 onwards, 0x8010_0000 will be 86 * 128th page, and virt_to_page( ) will return the struct page corresp to it. 87 * mem_map[ ] is an array of struct page for each page frame in the system 88 * 89 * Independent of where linux is linked at, link-addr = physical address 90 * So the old macro __pa = vaddr + PAGE_OFFSET - CONFIG_LINUX_LINK_BASE 91 * would have been wrong in case kernel is not at 0x8zs 92 */ 93 #define __pa(vaddr) ((unsigned long)vaddr) 94 #define __va(paddr) ((void *)((unsigned long)(paddr))) 95 96 #define virt_to_page(kaddr) \ 97 (mem_map + ((__pa(kaddr) - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT)) 98 99 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 100 101 /* Default Permissions for stack/heaps pages (Non Executable) */ 102 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE) 103 104 #define WANT_PAGE_VIRTUAL 1 105 106 #include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */ 107 #include <asm-generic/getorder.h> 108 109 #endif /* !__ASSEMBLY__ */ 110 111 #endif 112