LXR linux/arch/m68k/include/asm/page

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _M68K_PAGE_MM_H
   3#define _M68K_PAGE_MM_H
   4
   5#ifndef __ASSEMBLY__
   6
   7#include <linux/compiler.h>
   8#include <asm/module.h>
   9
  10/*
  11 * We don't need to check for alignment etc.
  12 */
  13#ifdef CPU_M68040_OR_M68060_ONLY
  14static inline void copy_page(void *to, void *from)
  15{
  16  unsigned long tmp;
  17
  18  __asm__ __volatile__("1:\t"
  19                       ".chip 68040\n\t"
  20                       "move16 %1@+,%0@+\n\t"
  21                       "move16 %1@+,%0@+\n\t"
  22                       ".chip 68k\n\t"
  23                       "dbra  %2,1b\n\t"
  24                       : "=a" (to), "=a" (from), "=d" (tmp)
  25                       : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
  26                       );
  27}
  28
  29static inline void clear_page(void *page)
  30{
  31        unsigned long tmp;
  32        unsigned long *sp = page;
  33
  34        *sp++ = 0;
  35        *sp++ = 0;
  36        *sp++ = 0;
  37        *sp++ = 0;
  38
  39        __asm__ __volatile__("1:\t"
  40                             ".chip 68040\n\t"
  41                             "move16 %2@+,%0@+\n\t"
  42                             ".chip 68k\n\t"
  43                             "subqw  #8,%2\n\t"
  44                             "subqw  #8,%2\n\t"
  45                             "dbra   %1,1b\n\t"
  46                             : "=a" (sp), "=d" (tmp)
  47                             : "a" (page), "0" (sp),
  48                               "1" ((PAGE_SIZE - 16) / 16 - 1));
  49}
  50
  51#else
  52#define clear_page(page)        memset((page), 0, PAGE_SIZE)
  53#define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
  54#endif
  55
  56#define clear_user_page(addr, vaddr, page)      \
  57        do {    clear_page(addr);               \
  58                flush_dcache_page(page);        \
  59        } while (0)
  60#define copy_user_page(to, from, vaddr, page)   \
  61        do {    copy_page(to, from);            \
  62                flush_dcache_page(page);        \
  63        } while (0)
  64
  65extern unsigned long m68k_memoffset;
  66
  67#ifndef CONFIG_SUN3
  68
  69#define WANT_PAGE_VIRTUAL
  70
  71static inline unsigned long ___pa(void *vaddr)
  72{
  73        unsigned long paddr;
  74        asm (
  75                "1:     addl #0,%0\n"
  76                m68k_fixup(%c2, 1b+2)
  77                : "=r" (paddr)
  78                : "0" (vaddr), "i" (m68k_fixup_memoffset));
  79        return paddr;
  80}
  81#define __pa(vaddr)     ___pa((void *)(long)(vaddr))
  82static inline void *__va(unsigned long paddr)
  83{
  84        void *vaddr;
  85        asm (
  86                "1:     subl #0,%0\n"
  87                m68k_fixup(%c2, 1b+2)
  88                : "=r" (vaddr)
  89                : "0" (paddr), "i" (m68k_fixup_memoffset));
  90        return vaddr;
  91}
  92
  93#else   /* !CONFIG_SUN3 */
  94/* This #define is a horrible hack to suppress lots of warnings. --m */
  95#define __pa(x) ___pa((unsigned long)(x))
  96static inline unsigned long ___pa(unsigned long x)
  97{
  98     if(x == 0)
  99          return 0;
 100     if(x >= PAGE_OFFSET)
 101        return (x-PAGE_OFFSET);
 102     else
 103        return (x+0x2000000);
 104}
 105
 106static inline void *__va(unsigned long x)
 107{
 108     if(x == 0)
 109          return (void *)0;
 110
 111     if(x < 0x2000000)
 112        return (void *)(x+PAGE_OFFSET);
 113     else
 114        return (void *)(x-0x2000000);
 115}
 116#endif  /* CONFIG_SUN3 */
 117
 118/*
 119 * NOTE: virtual isn't really correct, actually it should be the offset into the
 120 * memory node, but we have no highmem, so that works for now.
 121 * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
 122 * of the shifts unnecessary.
 123 */
 124#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 125#define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 126
 127extern int m68k_virt_to_node_shift;
 128
 129#ifdef CONFIG_SINGLE_MEMORY_CHUNK
 130#define __virt_to_node(addr)    (&pg_data_map[0])
 131#else
 132extern struct pglist_data *pg_data_table[];
 133
 134static inline __attribute_const__ int __virt_to_node_shift(void)
 135{
 136        int shift;
 137
 138        asm (
 139                "1:     moveq   #0,%0\n"
 140                m68k_fixup(%c1, 1b)
 141                : "=d" (shift)
 142                : "i" (m68k_fixup_vnode_shift));
 143        return shift;
 144}
 145
 146#define __virt_to_node(addr)    (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
 147#endif
 148
 149#define virt_to_page(addr) ({                                           \
 150        pfn_to_page(virt_to_pfn(addr));                                 \
 151})
 152#define page_to_virt(page) ({                                           \
 153        pfn_to_virt(page_to_pfn(page));                                 \
 154})
 155
 156#define pfn_to_page(pfn) ({                                             \
 157        unsigned long __pfn = (pfn);                                    \
 158        struct pglist_data *pgdat;                                      \
 159        pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn));      \
 160        pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn);          \
 161})
 162#define page_to_pfn(_page) ({                                           \
 163        const struct page *__p = (_page);                               \
 164        struct pglist_data *pgdat;                                      \
 165        pgdat = &pg_data_map[page_to_nid(__p)];                         \
 166        ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn;          \
 167})
 168
 169#define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
 170#define pfn_valid(pfn)          virt_addr_valid(pfn_to_virt(pfn))
 171
 172#endif /* __ASSEMBLY__ */
 173
 174#endif /* _M68K_PAGE_MM_H */
 175