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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ASM_SH_PAGE_H
   3#define __ASM_SH_PAGE_H
   4
   5/*
   6 * Copyright (C) 1999  Niibe Yutaka
   7 */
   8
   9#include <linux/const.h>
  10
  11/* PAGE_SHIFT determines the page size */
  12#if defined(CONFIG_PAGE_SIZE_4KB)
  13# define PAGE_SHIFT     12
  14#elif defined(CONFIG_PAGE_SIZE_8KB)
  15# define PAGE_SHIFT     13
  16#elif defined(CONFIG_PAGE_SIZE_16KB)
  17# define PAGE_SHIFT     14
  18#elif defined(CONFIG_PAGE_SIZE_64KB)
  19# define PAGE_SHIFT     16
  20#else
  21# error "Bogus kernel page size?"
  22#endif
  23
  24#define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  25#define PAGE_MASK       (~(PAGE_SIZE-1))
  26#define PTE_MASK        PAGE_MASK
  27
  28#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  29#define HPAGE_SHIFT     16
  30#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
  31#define HPAGE_SHIFT     18
  32#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
  33#define HPAGE_SHIFT     20
  34#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
  35#define HPAGE_SHIFT     22
  36#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
  37#define HPAGE_SHIFT     26
  38#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
  39#define HPAGE_SHIFT     29
  40#endif
  41
  42#ifdef CONFIG_HUGETLB_PAGE
  43#define HPAGE_SIZE              (1UL << HPAGE_SHIFT)
  44#define HPAGE_MASK              (~(HPAGE_SIZE-1))
  45#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT-PAGE_SHIFT)
  46#endif
  47
  48#ifndef __ASSEMBLY__
  49#include <asm/uncached.h>
  50
  51extern unsigned long shm_align_mask;
  52extern unsigned long max_low_pfn, min_low_pfn;
  53extern unsigned long memory_start, memory_end, memory_limit;
  54
  55static inline unsigned long
  56pages_do_alias(unsigned long addr1, unsigned long addr2)
  57{
  58        return (addr1 ^ addr2) & shm_align_mask;
  59}
  60
  61#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  62extern void copy_page(void *to, void *from);
  63#define copy_user_page(to, from, vaddr, pg)  __copy_user(to, from, PAGE_SIZE)
  64
  65struct page;
  66struct vm_area_struct;
  67
  68extern void copy_user_highpage(struct page *to, struct page *from,
  69                               unsigned long vaddr, struct vm_area_struct *vma);
  70#define __HAVE_ARCH_COPY_USER_HIGHPAGE
  71extern void clear_user_highpage(struct page *page, unsigned long vaddr);
  72#define clear_user_highpage     clear_user_highpage
  73
  74/*
  75 * These are used to make use of C type-checking..
  76 */
  77#ifdef CONFIG_X2TLB
  78typedef struct { unsigned long pte_low, pte_high; } pte_t;
  79typedef struct { unsigned long long pgprot; } pgprot_t;
  80typedef struct { unsigned long long pgd; } pgd_t;
  81#define pte_val(x) \
  82        ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  83#define __pte(x) \
  84        ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  85#elif defined(CONFIG_SUPERH32)
  86typedef struct { unsigned long pte_low; } pte_t;
  87typedef struct { unsigned long pgprot; } pgprot_t;
  88typedef struct { unsigned long pgd; } pgd_t;
  89#define pte_val(x)      ((x).pte_low)
  90#define __pte(x)        ((pte_t) { (x) } )
  91#else
  92typedef struct { unsigned long long pte_low; } pte_t;
  93typedef struct { unsigned long long pgprot; } pgprot_t;
  94typedef struct { unsigned long pgd; } pgd_t;
  95#define pte_val(x)      ((x).pte_low)
  96#define __pte(x)        ((pte_t) { (x) } )
  97#endif
  98
  99#define pgd_val(x)      ((x).pgd)
 100#define pgprot_val(x)   ((x).pgprot)
 101
 102#define __pgd(x) ((pgd_t) { (x) } )
 103#define __pgprot(x)     ((pgprot_t) { (x) } )
 104
 105typedef struct page *pgtable_t;
 106
 107#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
 108
 109#endif /* !__ASSEMBLY__ */
 110
 111/*
 112 * __MEMORY_START and SIZE are the physical addresses and size of RAM.
 113 */
 114#define __MEMORY_START          CONFIG_MEMORY_START
 115#define __MEMORY_SIZE           CONFIG_MEMORY_SIZE
 116
 117/*
 118 * PHYSICAL_OFFSET is the offset in physical memory where the base
 119 * of the kernel is loaded.
 120 */
 121#ifdef CONFIG_PHYSICAL_START
 122#define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START)
 123#else
 124#define PHYSICAL_OFFSET 0
 125#endif
 126
 127/*
 128 * PAGE_OFFSET is the virtual address of the start of kernel address
 129 * space.
 130 */
 131#define PAGE_OFFSET             CONFIG_PAGE_OFFSET
 132
 133/*
 134 * Virtual to physical RAM address translation.
 135 *
 136 * In 29 bit mode, the physical offset of RAM from address 0 is visible in
 137 * the kernel virtual address space, and thus we don't have to take
 138 * this into account when translating. However in 32 bit mode this offset
 139 * is not visible (it is part of the PMB mapping) and so needs to be
 140 * added or subtracted as required.
 141 */
 142#ifdef CONFIG_PMB
 143#define ___pa(x)        ((x)-PAGE_OFFSET+__MEMORY_START)
 144#define ___va(x)        ((x)+PAGE_OFFSET-__MEMORY_START)
 145#else
 146#define ___pa(x)        ((x)-PAGE_OFFSET)
 147#define ___va(x)        ((x)+PAGE_OFFSET)
 148#endif
 149
 150#ifndef __ASSEMBLY__
 151#define __pa(x)         ___pa((unsigned long)x)
 152#define __va(x)         (void *)___va((unsigned long)x)
 153#endif /* !__ASSEMBLY__ */
 154
 155#ifdef CONFIG_UNCACHED_MAPPING
 156#if defined(CONFIG_29BIT)
 157#define UNCAC_ADDR(addr)        P2SEGADDR(addr)
 158#define CAC_ADDR(addr)          P1SEGADDR(addr)
 159#else
 160#define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + uncached_start)
 161#define CAC_ADDR(addr)          ((addr) - uncached_start + PAGE_OFFSET)
 162#endif
 163#else
 164#define UNCAC_ADDR(addr)        ((addr))
 165#define CAC_ADDR(addr)          ((addr))
 166#endif
 167
 168#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 169#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 170
 171/*
 172 * PFN = physical frame number (ie PFN 0 == physical address 0)
 173 * PFN_START is the PFN of the first page of RAM. By defining this we
 174 * don't have struct page entries for the portion of address space
 175 * between physical address 0 and the start of RAM.
 176 */
 177#define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 178#define ARCH_PFN_OFFSET         (PFN_START)
 179#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 180#ifdef CONFIG_FLATMEM
 181#define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
 182#endif
 183#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 184
 185#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 186                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 187
 188#include <asm-generic/memory_model.h>
 189#include <asm-generic/getorder.h>
 190
 191/*
 192 * Some drivers need to perform DMA into kmalloc'ed buffers
 193 * and so we have to increase the kmalloc minalign for this.
 194 */
 195#define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
 196
 197#ifdef CONFIG_SUPERH64
 198/*
 199 * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
 200 * happily generate {ld/st}.q pairs, requiring us to have 8-byte
 201 * alignment to avoid traps. The kmalloc alignment is guaranteed by
 202 * virtue of L1_CACHE_BYTES, requiring this to only be special cased
 203 * for slab caches.
 204 */
 205#define ARCH_SLAB_MINALIGN      8
 206#endif
 207
 208#endif /* __ASM_SH_PAGE_H */
 209