io.c

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#include <linux/export.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);