LXR linux/arch/hexagon/include/asm/page.h

   1/*
   2 * Page management definitions for the Hexagon architecture
   3 *
   4 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 and
   8 * only version 2 as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18 * 02110-1301, USA.
  19 */
  20
  21#ifndef _ASM_PAGE_H
  22#define _ASM_PAGE_H
  23
  24#include <linux/const.h>
  25
  26/*  This is probably not the most graceful way to handle this.  */
  27
  28#ifdef CONFIG_PAGE_SIZE_4KB
  29#define PAGE_SHIFT 12
  30#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_4KB
  31#endif
  32
  33#ifdef CONFIG_PAGE_SIZE_16KB
  34#define PAGE_SHIFT 14
  35#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_16KB
  36#endif
  37
  38#ifdef CONFIG_PAGE_SIZE_64KB
  39#define PAGE_SHIFT 16
  40#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_64KB
  41#endif
  42
  43#ifdef CONFIG_PAGE_SIZE_256KB
  44#define PAGE_SHIFT 18
  45#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_256KB
  46#endif
  47
  48#ifdef CONFIG_PAGE_SIZE_1MB
  49#define PAGE_SHIFT 20
  50#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_1MB
  51#endif
  52
  53/*
  54 *  These should be defined in hugetlb.h, but apparently not.
  55 *  "Huge" for us should be 4MB or 16MB, which are both represented
  56 *  in L1 PTE's.  Right now, it's set up for 4MB.
  57 */
  58#ifdef CONFIG_HUGETLB_PAGE
  59#define HPAGE_SHIFT 22
  60#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
  61#define HPAGE_MASK (~(HPAGE_SIZE-1))
  62#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
  63#define HVM_HUGEPAGE_SIZE 0x5
  64#endif
  65
  66#define PAGE_SIZE  (1UL << PAGE_SHIFT)
  67#define PAGE_MASK  (~((1 << PAGE_SHIFT) - 1))
  68
  69#ifdef __KERNEL__
  70#ifndef __ASSEMBLY__
  71
  72/*
  73 * This is for PFN_DOWN, which mm.h needs.  Seems the right place to pull it in.
  74 */
  75#include <linux/pfn.h>
  76
  77/*
  78 * We implement a two-level architecture-specific page table structure.
  79 * Null intermediate page table level (pmd, pud) definitions will come from
  80 * asm-generic/pagetable-nopmd.h and asm-generic/pagetable-nopud.h
  81 */
  82typedef struct { unsigned long pte; } pte_t;
  83typedef struct { unsigned long pgd; } pgd_t;
  84typedef struct { unsigned long pgprot; } pgprot_t;
  85typedef struct page *pgtable_t;
  86
  87#define pte_val(x)     ((x).pte)
  88#define pgd_val(x)     ((x).pgd)
  89#define pgprot_val(x)  ((x).pgprot)
  90#define __pte(x)       ((pte_t) { (x) })
  91#define __pgd(x)       ((pgd_t) { (x) })
  92#define __pgprot(x)    ((pgprot_t) { (x) })
  93
  94/*
  95 * We need a __pa and a __va routine for kernel space.
  96 * MIPS says they're only used during mem_init.
  97 * also, check if we need a PHYS_OFFSET.
  98 */
  99#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
 100#define __va(x) ((void *)((unsigned long)(x) - PHYS_OFFSET + PAGE_OFFSET))
 101
 102/* The "page frame" descriptor is defined in linux/mm.h */
 103struct page;
 104
 105/* Returns page frame descriptor for virtual address. */
 106#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(__pa(kaddr)))
 107
 108/* Default vm area behavior is non-executable.  */
 109#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
 110                                VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 111
 112#define pfn_valid(pfn) ((pfn) < max_mapnr)
 113#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 114
 115/*  Need to not use a define for linesize; may move this to another file.  */
 116static inline void clear_page(void *page)
 117{
 118        /*  This can only be done on pages with L1 WB cache */
 119        asm volatile(
 120                "       loop0(1f,%1);\n"
 121                "1:     { dczeroa(%0);\n"
 122                "         %0 = add(%0,#32); }:endloop0\n"
 123                : "+r" (page)
 124                : "r" (PAGE_SIZE/32)
 125                : "lc0", "sa0", "memory"
 126        );
 127}
 128
 129#define copy_page(to, from)     memcpy((to), (from), PAGE_SIZE)
 130
 131/*
 132 * Under assumption that kernel always "sees" user map...
 133 */
 134#define clear_user_page(page, vaddr, pg)        clear_page(page)
 135#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
 136
 137/*
 138 * page_to_phys - convert page to physical address
 139 * @page - pointer to page entry in mem_map
 140 */
 141#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 142
 143#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 144#define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 145
 146#define page_to_virt(page)      __va(page_to_phys(page))
 147
 148/*
 149 * For port to Hexagon Virtual Machine, MAYBE we check for attempts
 150 * to reference reserved HVM space, but in any case, the VM will be
 151 * protected.
 152 */
 153#define kern_addr_valid(addr)   (1)
 154
 155#include <asm/mem-layout.h>
 156#include <asm-generic/memory_model.h>
 157/* XXX Todo: implement assembly-optimized version of getorder. */
 158#include <asm-generic/getorder.h>
 159
 160#endif /* ifdef __ASSEMBLY__ */
 161#endif /* ifdef __KERNEL__ */
 162
 163#endif
 164