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io.c

#include <linux/module.h>
#include <linux/types.h>
#include <linux/io.h>

/*
 * Copy data from IO memory space to "real" memory space.
 * This needs to be optimized.
 */
void _memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
{
      unsigned char *t = to;
      while (count) {
            count--;
            *t = readb(from);
            t++;
            from++;
      }
}

/*
 * Copy data from "real" memory space to IO memory space.
 * This needs to be optimized.
 */
void _memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
{
      const unsigned char *f = from;
      while (count) {
            count--;
            writeb(*f, to);
            f++;
            to++;
      }
}

/*
 * "memset" on IO memory space.
 * This needs to be optimized.
 */
void _memset_io(volatile void __iomem *dst, int c, size_t count)
{
      while (count) {
            count--;
            writeb(c, dst);
            dst++;
      }
}

EXPORT_SYMBOL(_memcpy_fromio);
EXPORT_SYMBOL(_memcpy_toio);
EXPORT_SYMBOL(_memset_io);

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