WSL2-Linux-Kernel/arch/sh/kernel/io.c

60 строки
1.2 KiB
C

/*
* linux/arch/sh/kernel/io.c
*
* Copyright (C) 2000 Stuart Menefy
*
* Provide real functions which expand to whatever the header file defined.
* Also definitions of machine independent IO functions.
*/
#include <asm/io.h>
#include <linux/module.h>
/*
* Copy data from IO memory space to "real" memory space.
* This needs to be optimized.
*/
void memcpy_fromio(void * to, unsigned long from, unsigned long count)
{
char *p = to;
while (count) {
count--;
*p = readb(from);
p++;
from++;
}
}
/*
* Copy data from "real" memory space to IO memory space.
* This needs to be optimized.
*/
void memcpy_toio(unsigned long to, const void * from, unsigned long count)
{
const char *p = from;
while (count) {
count--;
writeb(*p, to);
p++;
to++;
}
}
/*
* "memset" on IO memory space.
* This needs to be optimized.
*/
void memset_io(unsigned long dst, int c, unsigned long count)
{
while (count) {
count--;
writeb(c, dst);
dst++;
}
}
EXPORT_SYMBOL(memcpy_fromio);
EXPORT_SYMBOL(memcpy_toio);
EXPORT_SYMBOL(memset_io);