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Tip revision: d1eef1c619749b2a57e514a3fa67d9a516ffa919 authored by Linus Torvalds on 15 December 2019, 23:16:08 UTC
Linux 5.5-rc2
Linux 5.5-rc2
Tip revision: d1eef1c
iomem.c
#include <linux/string.h>
#include <linux/module.h>
#include <linux/io.h>
#define movs(type,to,from) \
asm volatile("movs" type:"=&D" (to), "=&S" (from):"0" (to), "1" (from):"memory")
/* Originally from i386/string.h */
static __always_inline void rep_movs(void *to, const void *from, size_t n)
{
unsigned long d0, d1, d2;
asm volatile("rep ; movsl\n\t"
"testb $2,%b4\n\t"
"je 1f\n\t"
"movsw\n"
"1:\ttestb $1,%b4\n\t"
"je 2f\n\t"
"movsb\n"
"2:"
: "=&c" (d0), "=&D" (d1), "=&S" (d2)
: "0" (n / 4), "q" (n), "1" ((long)to), "2" ((long)from)
: "memory");
}
void memcpy_fromio(void *to, const volatile void __iomem *from, size_t n)
{
if (unlikely(!n))
return;
/* Align any unaligned source IO */
if (unlikely(1 & (unsigned long)from)) {
movs("b", to, from);
n--;
}
if (n > 1 && unlikely(2 & (unsigned long)from)) {
movs("w", to, from);
n-=2;
}
rep_movs(to, (const void *)from, n);
}
EXPORT_SYMBOL(memcpy_fromio);
void memcpy_toio(volatile void __iomem *to, const void *from, size_t n)
{
if (unlikely(!n))
return;
/* Align any unaligned destination IO */
if (unlikely(1 & (unsigned long)to)) {
movs("b", to, from);
n--;
}
if (n > 1 && unlikely(2 & (unsigned long)to)) {
movs("w", to, from);
n-=2;
}
rep_movs((void *)to, (const void *) from, n);
}
EXPORT_SYMBOL(memcpy_toio);
void memset_io(volatile void __iomem *a, int b, size_t c)
{
/*
* TODO: memset can mangle the IO patterns quite a bit.
* perhaps it would be better to use a dumb one:
*/
memset((void *)a, b, c);
}
EXPORT_SYMBOL(memset_io);