23 lines
343 B
C
23 lines
343 B
C
|
/* See COPYRIGHT for copyright information. */
|
||
|
|
|
||
|
|
/* Support for reading the NVRAM from the real-time clock. */
|
||
|
|
|
||
|
|
#include <inc/x86.h>
|
||
|
|
|
||
|
|
#include <kern/kclock.h>
|
||
|
|
|
||
|
|
|
||
|
|
unsigned
|
||
|
|
mc146818_read(unsigned reg)
|
||
|
|
{
|
||
|
|
outb(IO_RTC, reg);
|
||
|
|
return inb(IO_RTC+1);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
mc146818_write(unsigned reg, unsigned datum)
|
||
|
|
{
|
||
|
|
outb(IO_RTC, reg);
|
||
|
|
outb(IO_RTC+1, datum);
|
||
|
|
}
|