1 #include <linux/string.h>
2 #include <linux/module.h>
5 /* Originally from i386/string.h */
6 static __always_inline void __iomem_memcpy(void *to, const void *from, size_t n)
8 unsigned long d0, d1, d2;
9 asm volatile("rep ; movsl\n\t"
13 "1:\ttestb $1,%b4\n\t"
17 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
18 : "0" (n / 4), "q" (n), "1" ((long)to), "2" ((long)from)
22 void memcpy_fromio(void *to, const volatile void __iomem *from, size_t n)
24 __iomem_memcpy(to, (const void *)from, n);
26 EXPORT_SYMBOL(memcpy_fromio);
28 void memcpy_toio(volatile void __iomem *to, const void *from, size_t n)
30 __iomem_memcpy((void *)to, (const void *) from, n);
32 EXPORT_SYMBOL(memcpy_toio);
34 void memset_io(volatile void __iomem *a, int b, size_t c)
37 * TODO: memset can mangle the IO patterns quite a bit.
38 * perhaps it would be better to use a dumb one:
40 memset((void *)a, b, c);
42 EXPORT_SYMBOL(memset_io);