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Linux/arch/arc/include/asm/page.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  4  */
  5 #ifndef __ASM_ARC_PAGE_H
  6 #define __ASM_ARC_PAGE_H
  7 
  8 #include <uapi/asm/page.h>
  9 
 10 #ifndef __ASSEMBLY__
 11 
 12 #define clear_page(paddr)               memset((paddr), 0, PAGE_SIZE)
 13 #define copy_page(to, from)             memcpy((to), (from), PAGE_SIZE)
 14 
 15 struct vm_area_struct;
 16 struct page;
 17 
 18 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
 19 
 20 void copy_user_highpage(struct page *to, struct page *from,
 21                         unsigned long u_vaddr, struct vm_area_struct *vma);
 22 void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
 23 
 24 #undef STRICT_MM_TYPECHECKS
 25 
 26 #ifdef STRICT_MM_TYPECHECKS
 27 /*
 28  * These are used to make use of C type-checking..
 29  */
 30 typedef struct {
 31 #ifdef CONFIG_ARC_HAS_PAE40
 32         unsigned long long pte;
 33 #else
 34         unsigned long pte;
 35 #endif
 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 /*
 77  * Use virt_to_pfn with caution:
 78  * If used in pte or paddr related macros, it could cause truncation
 79  * in PAE40 builds
 80  * As a rule of thumb, only use it in helpers starting with virt_
 81  * You have been warned !
 82  */
 83 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 84 
 85 #define ARCH_PFN_OFFSET         virt_to_pfn(CONFIG_LINUX_RAM_BASE)
 86 
 87 #ifdef CONFIG_FLATMEM
 88 #define pfn_valid(pfn)          (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
 89 #endif
 90 
 91 /*
 92  * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
 93  *
 94  * These macros have historically been misnamed
 95  * virt here means link-address/program-address as embedded in object code.
 96  * And for ARC, link-addr = physical address
 97  */
 98 #define __pa(vaddr)  ((unsigned long)(vaddr))
 99 #define __va(paddr)  ((void *)((unsigned long)(paddr)))
100 
101 #define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
102 #define virt_addr_valid(kaddr)  pfn_valid(virt_to_pfn(kaddr))
103 
104 /* Default Permissions for stack/heaps pages (Non Executable) */
105 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
106 
107 #define WANT_PAGE_VIRTUAL   1
108 
109 #include <asm-generic/memory_model.h>   /* page_to_pfn, pfn_to_page */
110 #include <asm-generic/getorder.h>
111 
112 #endif /* !__ASSEMBLY__ */
113 
114 #endif
115 

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