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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _PARISC_PAGE_H
   3#define _PARISC_PAGE_H
   4
   5#include <linux/const.h>
   6
   7#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
   8# define PAGE_SHIFT     12
   9#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
  10# define PAGE_SHIFT     14
  11#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
  12# define PAGE_SHIFT     16
  13#else
  14# error "unknown default kernel page size"
  15#endif
  16#define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  17#define PAGE_MASK       (~(PAGE_SIZE-1))
  18
  19
  20#ifndef __ASSEMBLY__
  21
  22#include <asm/types.h>
  23#include <asm/cache.h>
  24
  25#define clear_page(page)        clear_page_asm((void *)(page))
  26#define copy_page(to, from)     copy_page_asm((void *)(to), (void *)(from))
  27
  28struct page;
  29struct vm_area_struct;
  30
  31void clear_page_asm(void *page);
  32void copy_page_asm(void *to, void *from);
  33#define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
  34void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr,
  35                struct vm_area_struct *vma);
  36#define __HAVE_ARCH_COPY_USER_HIGHPAGE
  37
  38/*
  39 * These are used to make use of C type-checking..
  40 */
  41#define STRICT_MM_TYPECHECKS
  42#ifdef STRICT_MM_TYPECHECKS
  43typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
  44
  45/* NOTE: even on 64 bits, these entries are __u32 because we allocate
  46 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
  47typedef struct { __u32 pgd; } pgd_t;
  48typedef struct { unsigned long pgprot; } pgprot_t;
  49
  50#if CONFIG_PGTABLE_LEVELS == 3
  51typedef struct { __u32 pmd; } pmd_t;
  52#define __pmd(x)        ((pmd_t) { (x) } )
  53/* pXd_val() do not work as lvalues, so make sure we don't use them as such. */
  54#define pmd_val(x)      ((x).pmd + 0)
  55#endif
  56
  57#define pte_val(x)      ((x).pte)
  58#define pgd_val(x)      ((x).pgd + 0)
  59#define pgprot_val(x)   ((x).pgprot)
  60
  61#define __pte(x)        ((pte_t) { (x) } )
  62#define __pgd(x)        ((pgd_t) { (x) } )
  63#define __pgprot(x)     ((pgprot_t) { (x) } )
  64
  65#else
  66/*
  67 * .. while these make it easier on the compiler
  68 */
  69typedef unsigned long pte_t;
  70
  71#if CONFIG_PGTABLE_LEVELS == 3
  72typedef         __u32 pmd_t;
  73#define pmd_val(x)      (x)
  74#define __pmd(x)        (x)
  75#endif
  76
  77typedef         __u32 pgd_t;
  78typedef unsigned long pgprot_t;
  79
  80#define pte_val(x)      (x)
  81#define pgd_val(x)      (x)
  82#define pgprot_val(x)   (x)
  83
  84#define __pte(x)        (x)
  85#define __pgd(x)        (x)
  86#define __pgprot(x)     (x)
  87
  88#endif /* STRICT_MM_TYPECHECKS */
  89
  90#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
  91#if CONFIG_PGTABLE_LEVELS == 3
  92#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
  93#endif
  94
  95typedef struct page *pgtable_t;
  96
  97typedef struct __physmem_range {
  98        unsigned long start_pfn;
  99        unsigned long pages;       /* PAGE_SIZE pages */
 100} physmem_range_t;
 101
 102extern physmem_range_t pmem_ranges[];
 103extern int npmem_ranges;
 104
 105#endif /* !__ASSEMBLY__ */
 106
 107/* WARNING: The definitions below must match exactly to sizeof(pte_t)
 108 * etc
 109 */
 110#ifdef CONFIG_64BIT
 111#define BITS_PER_PTE_ENTRY      3
 112#define BITS_PER_PMD_ENTRY      2
 113#define BITS_PER_PGD_ENTRY      2
 114#else
 115#define BITS_PER_PTE_ENTRY      2
 116#define BITS_PER_PMD_ENTRY      2
 117#define BITS_PER_PGD_ENTRY      2
 118#endif
 119#define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 120#define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 121#define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 122
 123#define LINUX_GATEWAY_SPACE     0
 124
 125/* This governs the relationship between virtual and physical addresses.
 126 * If you alter it, make sure to take care of our various fixed mapping
 127 * segments in fixmap.h */
 128#ifdef CONFIG_64BIT
 129#define __PAGE_OFFSET_DEFAULT   (0x40000000)    /* 1GB */
 130#else
 131#define __PAGE_OFFSET_DEFAULT   (0x10000000)    /* 256MB */
 132#endif
 133
 134#if defined(BOOTLOADER)
 135#define __PAGE_OFFSET   (0)     /* bootloader uses physical addresses */
 136#else
 137#define __PAGE_OFFSET   __PAGE_OFFSET_DEFAULT
 138#endif /* BOOTLOADER */
 139
 140#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 141
 142/* The size of the gateway page (we leave lots of room for expansion) */
 143#define GATEWAY_PAGE_SIZE       0x4000
 144
 145/* The start of the actual kernel binary---used in vmlinux.lds.S
 146 * Leave some space after __PAGE_OFFSET for detecting kernel null
 147 * ptr derefs */
 148#define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 149
 150/* These macros don't work for 64-bit C code -- don't allow in C at all */
 151#ifdef __ASSEMBLY__
 152#   define PA(x)        ((x)-__PAGE_OFFSET)
 153#   define VA(x)        ((x)+__PAGE_OFFSET)
 154#endif
 155#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 156#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 157
 158#ifndef CONFIG_SPARSEMEM
 159#define pfn_valid(pfn)          ((pfn) < max_mapnr)
 160#endif
 161
 162#ifdef CONFIG_HUGETLB_PAGE
 163#define HPAGE_SHIFT             PMD_SHIFT /* fixed for transparent huge pages */
 164#define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
 165#define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 166#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 167
 168#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 169# define REAL_HPAGE_SHIFT       20 /* 20 = 1MB */
 170# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
 171#elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 172# define REAL_HPAGE_SHIFT       22 /* 22 = 4MB */
 173# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
 174#else
 175# define REAL_HPAGE_SHIFT       24 /* 24 = 16MB */
 176# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
 177#endif
 178#endif /* CONFIG_HUGETLB_PAGE */
 179
 180#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 181
 182#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 183#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 184
 185#include <asm-generic/memory_model.h>
 186#include <asm-generic/getorder.h>
 187#include <asm/pdc.h>
 188
 189#define PAGE0   ((struct zeropage *)absolute_pointer(__PAGE_OFFSET))
 190
 191/* DEFINITION OF THE ZERO-PAGE (PAG0) */
 192/* based on work by Jason Eckhardt (jason@equator.com) */
 193
 194#endif /* _PARISC_PAGE_H */
 195