arch/sh/kernel/io.c

   1 /*
   2  * linux/arch/sh/kernel/io.c
   3  *
   4  * Copyright (C) 2000  Stuart Menefy
   5  *
   6  * Provide real functions which expand to whatever the header file defined.
   7  * Also definitions of machine independent IO functions.
   8  */
   9
  10 #include <asm/io.h>
  11 #include <linux/module.h>
  12
  13 /*
  14  * Copy data from IO memory space to "real" memory space.
  15  * This needs to be optimized.
  16  */
  17 void  memcpy_fromio(void * to, unsigned long from, unsigned long count)
  18 {
  19         char *p = to;
  20         while (count) {
  21                 count--;
  22                 *p = readb(from);
  23                 p++;
  24                 from++;
  25         }
  26 }
  27
  28 /*
  29  * Copy data from "real" memory space to IO memory space.
  30  * This needs to be optimized.
  31  */
  32 void  memcpy_toio(unsigned long to, const void * from, unsigned long count)
  33 {
  34         const char *p = from;
  35         while (count) {
  36                 count--;
  37                 writeb(*p, to);
  38                 p++;
  39                 to++;
  40         }
  41 }
  42
  43 /*
  44  * "memset" on IO memory space.
  45  * This needs to be optimized.
  46  */
  47 void  memset_io(unsigned long dst, int c, unsigned long count)
  48 {
  49         while (count) {
  50                 count--;
  51                 writeb(c, dst);
  52                 dst++;
  53         }
  54 }
  55
  56 EXPORT_SYMBOL(memcpy_fromio);
  57 EXPORT_SYMBOL(memcpy_toio);
  58 EXPORT_SYMBOL(memset_io);
  59