root/arch/hexagon/include/asm/page.h

INCLUDED FROM

DEFINITIONS

1. clear_page

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Page management definitions for the Hexagon architecture
   4  *
   5  * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
   6  */
   7 
   8 #ifndef _ASM_PAGE_H
   9 #define _ASM_PAGE_H
  10 
  11 #include <linux/const.h>
  12 
  13 /*  This is probably not the most graceful way to handle this.  */
  14 
  15 #ifdef CONFIG_PAGE_SIZE_4KB
  16 #define PAGE_SHIFT 12
  17 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_4KB
  18 #endif
  19 
  20 #ifdef CONFIG_PAGE_SIZE_16KB
  21 #define PAGE_SHIFT 14
  22 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_16KB
  23 #endif
  24 
  25 #ifdef CONFIG_PAGE_SIZE_64KB
  26 #define PAGE_SHIFT 16
  27 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_64KB
  28 #endif
  29 
  30 #ifdef CONFIG_PAGE_SIZE_256KB
  31 #define PAGE_SHIFT 18
  32 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_256KB
  33 #endif
  34 
  35 #ifdef CONFIG_PAGE_SIZE_1MB
  36 #define PAGE_SHIFT 20
  37 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_1MB
  38 #endif
  39 
  40 /*
  41  *  These should be defined in hugetlb.h, but apparently not.
  42  *  "Huge" for us should be 4MB or 16MB, which are both represented
  43  *  in L1 PTE's.  Right now, it's set up for 4MB.
  44  */
  45 #ifdef CONFIG_HUGETLB_PAGE
  46 #define HPAGE_SHIFT 22
  47 #define HPAGE_SIZE (1UL << HPAGE_SHIFT)
  48 #define HPAGE_MASK (~(HPAGE_SIZE-1))
  49 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
  50 #define HVM_HUGEPAGE_SIZE 0x5
  51 #endif
  52 
  53 #define PAGE_SIZE  (1UL << PAGE_SHIFT)
  54 #define PAGE_MASK  (~((1 << PAGE_SHIFT) - 1))
  55 
  56 #ifdef __KERNEL__
  57 #ifndef __ASSEMBLY__
  58 
  59 /*
  60  * This is for PFN_DOWN, which mm.h needs.  Seems the right place to pull it in.
  61  */
  62 #include <linux/pfn.h>
  63 
  64 /*
  65  * We implement a two-level architecture-specific page table structure.
  66  * Null intermediate page table level (pmd, pud) definitions will come from
  67  * asm-generic/pagetable-nopmd.h and asm-generic/pagetable-nopud.h
  68  */
  69 typedef struct { unsigned long pte; } pte_t;
  70 typedef struct { unsigned long pgd; } pgd_t;
  71 typedef struct { unsigned long pgprot; } pgprot_t;
  72 typedef struct page *pgtable_t;
  73 
  74 #define pte_val(x)     ((x).pte)
  75 #define pgd_val(x)     ((x).pgd)
  76 #define pgprot_val(x)  ((x).pgprot)
  77 #define __pte(x)       ((pte_t) { (x) })
  78 #define __pgd(x)       ((pgd_t) { (x) })
  79 #define __pgprot(x)    ((pgprot_t) { (x) })
  80 
  81 /*
  82  * We need a __pa and a __va routine for kernel space.
  83  * MIPS says they're only used during mem_init.
  84  * also, check if we need a PHYS_OFFSET.
  85  */
  86 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
  87 #define __va(x) ((void *)((unsigned long)(x) - PHYS_OFFSET + PAGE_OFFSET))
  88 
  89 /* The "page frame" descriptor is defined in linux/mm.h */
  90 struct page;
  91 
  92 /* Returns page frame descriptor for virtual address. */
  93 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(__pa(kaddr)))
  94 
  95 /* Default vm area behavior is non-executable.  */
  96 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
  97                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  98 
  99 #define pfn_valid(pfn) ((pfn) < max_mapnr)
 100 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 101 
 102 /*  Need to not use a define for linesize; may move this to another file.  */
 103 static inline void clear_page(void *page)
 104 {
 105         /*  This can only be done on pages with L1 WB cache */
 106         asm volatile(
 107                 "       loop0(1f,%1);\n"
 108                 "1:     { dczeroa(%0);\n"
 109                 "         %0 = add(%0,#32); }:endloop0\n"
 110                 : "+r" (page)
 111                 : "r" (PAGE_SIZE/32)
 112                 : "lc0", "sa0", "memory"
 113         );
 114 }
 115 
 116 #define copy_page(to, from)     memcpy((to), (from), PAGE_SIZE)
 117 
 118 /*
 119  * Under assumption that kernel always "sees" user map...
 120  */
 121 #define clear_user_page(page, vaddr, pg)        clear_page(page)
 122 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
 123 
 124 /*
 125  * page_to_phys - convert page to physical address
 126  * @page - pointer to page entry in mem_map
 127  */
 128 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 129 
 130 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 131 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 132 
 133 #define page_to_virt(page)      __va(page_to_phys(page))
 134 
 135 /*
 136  * For port to Hexagon Virtual Machine, MAYBE we check for attempts
 137  * to reference reserved HVM space, but in any case, the VM will be
 138  * protected.
 139  */
 140 #define kern_addr_valid(addr)   (1)
 141 
 142 #include <asm/mem-layout.h>
 143 #include <asm-generic/memory_model.h>
 144 /* XXX Todo: implement assembly-optimized version of getorder. */
 145 #include <asm-generic/getorder.h>
 146 
 147 #endif /* ifdef __ASSEMBLY__ */
 148 #endif /* ifdef __KERNEL__ */
 149 
 150 #endif