root/arch/m68k/mm/cache.c

DEFINITIONS

1. virt_to_phys_slow
2. flush_icache_range
3. flush_icache_user_range

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/arch/m68k/mm/cache.c
   4  *
   5  *  Instruction cache handling
   6  *
   7  *  Copyright (C) 1995  Hamish Macdonald
   8  */
   9 
  10 #include <linux/module.h>
  11 #include <asm/pgalloc.h>
  12 #include <asm/traps.h>
  13 
  14 
  15 static unsigned long virt_to_phys_slow(unsigned long vaddr)
  16 {
  17         if (CPU_IS_060) {
  18                 unsigned long paddr;
  19 
  20                 /* The PLPAR instruction causes an access error if the translation
  21                  * is not possible. To catch this we use the same exception mechanism
  22                  * as for user space accesses in <asm/uaccess.h>. */
  23                 asm volatile (".chip 68060\n"
  24                               "1: plpar (%0)\n"
  25                               ".chip 68k\n"
  26                               "2:\n"
  27                               ".section .fixup,\"ax\"\n"
  28                               "   .even\n"
  29                               "3: sub.l %0,%0\n"
  30                               "   jra 2b\n"
  31                               ".previous\n"
  32                               ".section __ex_table,\"a\"\n"
  33                               "   .align 4\n"
  34                               "   .long 1b,3b\n"
  35                               ".previous"
  36                               : "=a" (paddr)
  37                               : "0" (vaddr));
  38                 return paddr;
  39         } else if (CPU_IS_040) {
  40                 unsigned long mmusr;
  41 
  42                 asm volatile (".chip 68040\n\t"
  43                               "ptestr (%1)\n\t"
  44                               "movec %%mmusr, %0\n\t"
  45                               ".chip 68k"
  46                               : "=r" (mmusr)
  47                               : "a" (vaddr));
  48 
  49                 if (mmusr & MMU_R_040)
  50                         return (mmusr & PAGE_MASK) | (vaddr & ~PAGE_MASK);
  51         } else {
  52                 unsigned short mmusr;
  53                 unsigned long *descaddr;
  54 
  55                 asm volatile ("ptestr %3,%2@,#7,%0\n\t"
  56                               "pmove %%psr,%1"
  57                               : "=a&" (descaddr), "=m" (mmusr)
  58                               : "a" (vaddr), "d" (get_fs().seg));
  59                 if (mmusr & (MMU_I|MMU_B|MMU_L))
  60                         return 0;
  61                 descaddr = phys_to_virt((unsigned long)descaddr);
  62                 switch (mmusr & MMU_NUM) {
  63                 case 1:
  64                         return (*descaddr & 0xfe000000) | (vaddr & 0x01ffffff);
  65                 case 2:
  66                         return (*descaddr & 0xfffc0000) | (vaddr & 0x0003ffff);
  67                 case 3:
  68                         return (*descaddr & PAGE_MASK) | (vaddr & ~PAGE_MASK);
  69                 }
  70         }
  71         return 0;
  72 }
  73 
  74 /* Push n pages at kernel virtual address and clear the icache */
  75 /* RZ: use cpush %bc instead of cpush %dc, cinv %ic */
  76 void flush_icache_range(unsigned long address, unsigned long endaddr)
  77 {
  78         if (CPU_IS_COLDFIRE) {
  79                 unsigned long start, end;
  80                 start = address & ICACHE_SET_MASK;
  81                 end = endaddr & ICACHE_SET_MASK;
  82                 if (start > end) {
  83                         flush_cf_icache(0, end);
  84                         end = ICACHE_MAX_ADDR;
  85                 }
  86                 flush_cf_icache(start, end);
  87         } else if (CPU_IS_040_OR_060) {
  88                 address &= PAGE_MASK;
  89 
  90                 do {
  91                         asm volatile ("nop\n\t"
  92                                       ".chip 68040\n\t"
  93                                       "cpushp %%bc,(%0)\n\t"
  94                                       ".chip 68k"
  95                                       : : "a" (virt_to_phys_slow(address)));
  96                         address += PAGE_SIZE;
  97                 } while (address < endaddr);
  98         } else {
  99                 unsigned long tmp;
 100                 asm volatile ("movec %%cacr,%0\n\t"
 101                               "orw %1,%0\n\t"
 102                               "movec %0,%%cacr"
 103                               : "=&d" (tmp)
 104                               : "di" (FLUSH_I));
 105         }
 106 }
 107 EXPORT_SYMBOL(flush_icache_range);
 108 
 109 void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
 110                              unsigned long addr, int len)
 111 {
 112         if (CPU_IS_COLDFIRE) {
 113                 unsigned long start, end;
 114                 start = addr & ICACHE_SET_MASK;
 115                 end = (addr + len) & ICACHE_SET_MASK;
 116                 if (start > end) {
 117                         flush_cf_icache(0, end);
 118                         end = ICACHE_MAX_ADDR;
 119                 }
 120                 flush_cf_icache(start, end);
 121 
 122         } else if (CPU_IS_040_OR_060) {
 123                 asm volatile ("nop\n\t"
 124                               ".chip 68040\n\t"
 125                               "cpushp %%bc,(%0)\n\t"
 126                               ".chip 68k"
 127                               : : "a" (page_to_phys(page)));
 128         } else {
 129                 unsigned long tmp;
 130                 asm volatile ("movec %%cacr,%0\n\t"
 131                               "orw %1,%0\n\t"
 132                               "movec %0,%%cacr"
 133                               : "=&d" (tmp)
 134                               : "di" (FLUSH_I));
 135         }
 136 }
 137