io.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:1k
- #include <linux/module.h>
- #include <linux/types.h>
- #include <asm/io.h>
- /*
- * Copy data from IO memory space to "real" memory space.
- * This needs to be optimized.
- */
- void _memcpy_fromio(void * to, unsigned long from, size_t count)
- {
- while (count) {
- count--;
- *(char *) to = readb(from);
- ((char *) to)++;
- 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, size_t count)
- {
- while (count) {
- count--;
- writeb(*(char *) from, to);
- ((char *) from)++;
- to++;
- }
- }
- /*
- * "memset" on IO memory space.
- * This needs to be optimized.
- */
- void _memset_io(unsigned long 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);