linux/arch/hexagon/include/asm/page.h
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   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 */
  69typedef struct { unsigned long pte; } pte_t;
  70typedef struct { unsigned long pgd; } pgd_t;
  71typedef struct { unsigned long pgprot; } pgprot_t;
  72typedef 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 */
  90struct 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_DATA_FLAGS_NON_EXEC
  97
  98#define pfn_valid(pfn) ((pfn) < max_mapnr)
  99#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 100
 101/*  Need to not use a define for linesize; may move this to another file.  */
 102static inline void clear_page(void *page)
 103{
 104        /*  This can only be done on pages with L1 WB cache */
 105        asm volatile(
 106                "       loop0(1f,%1);\n"
 107                "1:     { dczeroa(%0);\n"
 108                "         %0 = add(%0,#32); }:endloop0\n"
 109                : "+r" (page)
 110                : "r" (PAGE_SIZE/32)
 111                : "lc0", "sa0", "memory"
 112        );
 113}
 114
 115#define copy_page(to, from)     memcpy((to), (from), PAGE_SIZE)
 116
 117/*
 118 * Under assumption that kernel always "sees" user map...
 119 */
 120#define clear_user_page(page, vaddr, pg)        clear_page(page)
 121#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
 122
 123/*
 124 * page_to_phys - convert page to physical address
 125 * @page - pointer to page entry in mem_map
 126 */
 127#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 128
 129#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 130#define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 131
 132#define page_to_virt(page)      __va(page_to_phys(page))
 133
 134/*
 135 * For port to Hexagon Virtual Machine, MAYBE we check for attempts
 136 * to reference reserved HVM space, but in any case, the VM will be
 137 * protected.
 138 */
 139#define kern_addr_valid(addr)   (1)
 140
 141#include <asm/mem-layout.h>
 142#include <asm-generic/memory_model.h>
 143/* XXX Todo: implement assembly-optimized version of getorder. */
 144#include <asm-generic/getorder.h>
 145
 146#endif /* ifdef __ASSEMBLY__ */
 147#endif /* ifdef __KERNEL__ */
 148
 149#endif
 150
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