linux/arch/sh/include/asm/page.h
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   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#endif
  39
  40#ifdef CONFIG_HUGETLB_PAGE
  41#define HPAGE_SIZE              (1UL << HPAGE_SHIFT)
  42#define HPAGE_MASK              (~(HPAGE_SIZE-1))
  43#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT-PAGE_SHIFT)
  44#endif
  45
  46#ifndef __ASSEMBLY__
  47#include <asm/uncached.h>
  48
  49extern unsigned long shm_align_mask;
  50extern unsigned long max_low_pfn, min_low_pfn;
  51extern unsigned long memory_start, memory_end, memory_limit;
  52
  53static inline unsigned long
  54pages_do_alias(unsigned long addr1, unsigned long addr2)
  55{
  56        return (addr1 ^ addr2) & shm_align_mask;
  57}
  58
  59#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  60extern void copy_page(void *to, void *from);
  61#define copy_user_page(to, from, vaddr, pg)  __copy_user(to, from, PAGE_SIZE)
  62
  63struct page;
  64struct vm_area_struct;
  65
  66extern void copy_user_highpage(struct page *to, struct page *from,
  67                               unsigned long vaddr, struct vm_area_struct *vma);
  68#define __HAVE_ARCH_COPY_USER_HIGHPAGE
  69extern void clear_user_highpage(struct page *page, unsigned long vaddr);
  70#define clear_user_highpage     clear_user_highpage
  71
  72/*
  73 * These are used to make use of C type-checking..
  74 */
  75#ifdef CONFIG_X2TLB
  76typedef struct { unsigned long pte_low, pte_high; } pte_t;
  77typedef struct { unsigned long long pgprot; } pgprot_t;
  78typedef struct { unsigned long long pgd; } pgd_t;
  79#define pte_val(x) \
  80        ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  81#define __pte(x) \
  82        ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  83#else
  84typedef struct { unsigned long pte_low; } pte_t;
  85typedef struct { unsigned long pgprot; } pgprot_t;
  86typedef struct { unsigned long pgd; } pgd_t;
  87#define pte_val(x)      ((x).pte_low)
  88#define __pte(x)        ((pte_t) { (x) } )
  89#endif
  90
  91#define pgd_val(x)      ((x).pgd)
  92#define pgprot_val(x)   ((x).pgprot)
  93
  94#define __pgd(x) ((pgd_t) { (x) } )
  95#define __pgprot(x)     ((pgprot_t) { (x) } )
  96
  97typedef struct page *pgtable_t;
  98
  99#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
 100
 101#endif /* !__ASSEMBLY__ */
 102
 103/*
 104 * __MEMORY_START and SIZE are the physical addresses and size of RAM.
 105 */
 106#define __MEMORY_START          CONFIG_MEMORY_START
 107#define __MEMORY_SIZE           CONFIG_MEMORY_SIZE
 108
 109/*
 110 * PHYSICAL_OFFSET is the offset in physical memory where the base
 111 * of the kernel is loaded.
 112 */
 113#ifdef CONFIG_PHYSICAL_START
 114#define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START)
 115#else
 116#define PHYSICAL_OFFSET 0
 117#endif
 118
 119/*
 120 * PAGE_OFFSET is the virtual address of the start of kernel address
 121 * space.
 122 */
 123#define PAGE_OFFSET             CONFIG_PAGE_OFFSET
 124
 125/*
 126 * Virtual to physical RAM address translation.
 127 *
 128 * In 29 bit mode, the physical offset of RAM from address 0 is visible in
 129 * the kernel virtual address space, and thus we don't have to take
 130 * this into account when translating. However in 32 bit mode this offset
 131 * is not visible (it is part of the PMB mapping) and so needs to be
 132 * added or subtracted as required.
 133 */
 134#ifdef CONFIG_PMB
 135#define ___pa(x)        ((x)-PAGE_OFFSET+__MEMORY_START)
 136#define ___va(x)        ((x)+PAGE_OFFSET-__MEMORY_START)
 137#else
 138#define ___pa(x)        ((x)-PAGE_OFFSET)
 139#define ___va(x)        ((x)+PAGE_OFFSET)
 140#endif
 141
 142#ifndef __ASSEMBLY__
 143#define __pa(x)         ___pa((unsigned long)x)
 144#define __va(x)         (void *)___va((unsigned long)x)
 145#endif /* !__ASSEMBLY__ */
 146
 147#ifdef CONFIG_UNCACHED_MAPPING
 148#if defined(CONFIG_29BIT)
 149#define UNCAC_ADDR(addr)        P2SEGADDR(addr)
 150#define CAC_ADDR(addr)          P1SEGADDR(addr)
 151#else
 152#define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + uncached_start)
 153#define CAC_ADDR(addr)          ((addr) - uncached_start + PAGE_OFFSET)
 154#endif
 155#else
 156#define UNCAC_ADDR(addr)        ((addr))
 157#define CAC_ADDR(addr)          ((addr))
 158#endif
 159
 160#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 161#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 162
 163/*
 164 * PFN = physical frame number (ie PFN 0 == physical address 0)
 165 * PFN_START is the PFN of the first page of RAM. By defining this we
 166 * don't have struct page entries for the portion of address space
 167 * between physical address 0 and the start of RAM.
 168 */
 169#define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 170#define ARCH_PFN_OFFSET         (PFN_START)
 171#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 172#ifdef CONFIG_FLATMEM
 173#define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
 174#endif
 175#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 176
 177#include <asm-generic/memory_model.h>
 178#include <asm-generic/getorder.h>
 179
 180/*
 181 * Some drivers need to perform DMA into kmalloc'ed buffers
 182 * and so we have to increase the kmalloc minalign for this.
 183 */
 184#define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
 185
 186#endif /* __ASM_SH_PAGE_H */
 187
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