i386/linux/linux-2.3.21/arch/arm/lib/io.c

   1 #include <linux/module.h>
   2
   3 #include <asm/io.h>
   4
   5 /*
   6  * Copy data from IO memory space to "real" memory space.
   7  * This needs to be optimized.
   8  */
   9 void _memcpy_fromio(void * to, unsigned long from, unsigned long count)
  10 {
  11         while (count) {
  12                 count--;
  13                 *(char *) to = readb(from);
  14                 ((char *) to)++;
  15                 from++;
  16         }
  17 }
  18
  19 /*
  20  * Copy data from "real" memory space to IO memory space.
  21  * This needs to be optimized.
  22  */
  23 void _memcpy_toio(unsigned long to, const void * from, unsigned long count)
  24 {
  25         while (count) {
  26                 count--;
  27                 writeb(*(char *) from, to);
  28                 ((char *) from)++;
  29                 to++;
  30         }
  31 }
  32
  33 /*
  34  * "memset" on IO memory space.
  35  * This needs to be optimized.
  36  */
  37 void _memset_io(unsigned long dst, int c, unsigned long count)
  38 {
  39         while (count) {
  40                 count--;
  41                 writeb(c, dst);
  42                 dst++;
  43         }
  44 }
  45
  46 EXPORT_SYMBOL(_memcpy_fromio);
  47 EXPORT_SYMBOL(_memcpy_toio);
  48 EXPORT_SYMBOL(_memset_io);
  49