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;
  29
  30void clear_page_asm(void *page);
  31void copy_page_asm(void *to, void *from);
  32#define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
  33void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  34                        struct page *pg);
  35
  36/*
  37 * These are used to make use of C type-checking..
  38 */
  39#define STRICT_MM_TYPECHECKS
  40#ifdef STRICT_MM_TYPECHECKS
  41typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
  42
  43/* NOTE: even on 64 bits, these entries are __u32 because we allocate
  44 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
  45typedef struct { __u32 pgd; } pgd_t;
  46typedef struct { unsigned long pgprot; } pgprot_t;
  47
  48#if CONFIG_PGTABLE_LEVELS == 3
  49typedef struct { __u32 pmd; } pmd_t;
  50#define __pmd(x)        ((pmd_t) { (x) } )
  51/* pXd_val() do not work as lvalues, so make sure we don't use them as such. */
  52#define pmd_val(x)      ((x).pmd + 0)
  53#endif
  54
  55#define pte_val(x)      ((x).pte)
  56#define pgd_val(x)      ((x).pgd + 0)
  57#define pgprot_val(x)   ((x).pgprot)
  58
  59#define __pte(x)        ((pte_t) { (x) } )
  60#define __pgd(x)        ((pgd_t) { (x) } )
  61#define __pgprot(x)     ((pgprot_t) { (x) } )
  62
  63#else
  64/*
  65 * .. while these make it easier on the compiler
  66 */
  67typedef unsigned long pte_t;
  68
  69#if CONFIG_PGTABLE_LEVELS == 3
  70typedef         __u32 pmd_t;
  71#define pmd_val(x)      (x)
  72#define __pmd(x)        (x)
  73#endif
  74
  75typedef         __u32 pgd_t;
  76typedef unsigned long pgprot_t;
  77
  78#define pte_val(x)      (x)
  79#define pgd_val(x)      (x)
  80#define pgprot_val(x)   (x)
  81
  82#define __pte(x)        (x)
  83#define __pgd(x)        (x)
  84#define __pgprot(x)     (x)
  85
  86#endif /* STRICT_MM_TYPECHECKS */
  87
  88#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
  89#if CONFIG_PGTABLE_LEVELS == 3
  90#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
  91#endif
  92
  93typedef struct page *pgtable_t;
  94
  95typedef struct __physmem_range {
  96        unsigned long start_pfn;
  97        unsigned long pages;       /* PAGE_SIZE pages */
  98} physmem_range_t;
  99
 100extern physmem_range_t pmem_ranges[];
 101extern int npmem_ranges;
 102
 103#endif /* !__ASSEMBLY__ */
 104
 105/* WARNING: The definitions below must match exactly to sizeof(pte_t)
 106 * etc
 107 */
 108#ifdef CONFIG_64BIT
 109#define BITS_PER_PTE_ENTRY      3
 110#define BITS_PER_PMD_ENTRY      2
 111#define BITS_PER_PGD_ENTRY      2
 112#else
 113#define BITS_PER_PTE_ENTRY      2
 114#define BITS_PER_PMD_ENTRY      2
 115#define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
 116#endif
 117#define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 118#define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 119#define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 120
 121#define LINUX_GATEWAY_SPACE     0
 122
 123/* This governs the relationship between virtual and physical addresses.
 124 * If you alter it, make sure to take care of our various fixed mapping
 125 * segments in fixmap.h */
 126#ifdef CONFIG_64BIT
 127#define __PAGE_OFFSET_DEFAULT   (0x40000000)    /* 1GB */
 128#else
 129#define __PAGE_OFFSET_DEFAULT   (0x10000000)    /* 256MB */
 130#endif
 131
 132#if defined(BOOTLOADER)
 133#define __PAGE_OFFSET   (0)     /* bootloader uses physical addresses */
 134#else
 135#define __PAGE_OFFSET   __PAGE_OFFSET_DEFAULT
 136#endif /* BOOTLOADER */
 137
 138#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 139
 140/* The size of the gateway page (we leave lots of room for expansion) */
 141#define GATEWAY_PAGE_SIZE       0x4000
 142
 143/* The start of the actual kernel binary---used in vmlinux.lds.S
 144 * Leave some space after __PAGE_OFFSET for detecting kernel null
 145 * ptr derefs */
 146#define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 147
 148/* These macros don't work for 64-bit C code -- don't allow in C at all */
 149#ifdef __ASSEMBLY__
 150#   define PA(x)        ((x)-__PAGE_OFFSET)
 151#   define VA(x)        ((x)+__PAGE_OFFSET)
 152#endif
 153#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 154#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 155
 156#ifndef CONFIG_SPARSEMEM
 157#define pfn_valid(pfn)          ((pfn) < max_mapnr)
 158#endif
 159
 160#ifdef CONFIG_HUGETLB_PAGE
 161#define HPAGE_SHIFT             PMD_SHIFT /* fixed for transparent huge pages */
 162#define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
 163#define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 164#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 165
 166#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 167# define REAL_HPAGE_SHIFT       20 /* 20 = 1MB */
 168# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
 169#elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 170# define REAL_HPAGE_SHIFT       22 /* 22 = 4MB */
 171# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
 172#else
 173# define REAL_HPAGE_SHIFT       24 /* 24 = 16MB */
 174# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
 175#endif
 176#endif /* CONFIG_HUGETLB_PAGE */
 177
 178#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 179
 180#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 181#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 182
 183#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 184                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 185
 186#include <asm-generic/memory_model.h>
 187#include <asm-generic/getorder.h>
 188#include <asm/pdc.h>
 189
 190#define PAGE0   ((struct zeropage *)__PAGE_OFFSET)
 191
 192/* DEFINITION OF THE ZERO-PAGE (PAG0) */
 193/* based on work by Jason Eckhardt (jason@equator.com) */
 194
 195#endif /* _PARISC_PAGE_H */
 196