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