99 lines
2.0 KiB
C
99 lines
2.0 KiB
C
|
/*
|
||
|
|
* console.c: Routines that deal with sending and receiving IO
|
||
|
|
* to/from the current console device using the PROM.
|
||
|
|
*
|
||
|
|
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
|
||
|
|
* Copyright (C) 1998 Pete Zaitcev <zaitcev@yahoo.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <asm/openprom.h>
|
||
|
|
#include <asm/oplib.h>
|
||
|
|
#include <asm/system.h>
|
||
|
|
#include <linux/string.h>
|
||
|
|
|
||
|
|
extern void restore_current(void);
|
||
|
|
|
||
|
|
/* Non blocking get character from console input device, returns -1
|
||
|
|
* if no input was taken. This can be used for polling.
|
||
|
|
*/
|
||
|
|
int
|
||
|
|
prom_nbgetchar(void)
|
||
|
|
{
|
||
|
|
static char inc;
|
||
|
|
int i = -1;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&prom_lock, flags);
|
||
|
|
switch(prom_vers) {
|
||
|
|
case PROM_V0:
|
||
|
|
i = (*(romvec->pv_nbgetchar))();
|
||
|
|
break;
|
||
|
|
case PROM_V2:
|
||
|
|
case PROM_V3:
|
||
|
|
if( (*(romvec->pv_v2devops).v2_dev_read)(*romvec->pv_v2bootargs.fd_stdin , &inc, 0x1) == 1) {
|
||
|
|
i = inc;
|
||
|
|
} else {
|
||
|
|
i = -1;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
i = -1;
|
||
|
|
break;
|
||
|
|
};
|
||
|
|
restore_current();
|
||
|
|
spin_unlock_irqrestore(&prom_lock, flags);
|
||
|
|
return i; /* Ugh, we could spin forever on unsupported proms ;( */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Non blocking put character to console device, returns -1 if
|
||
|
|
* unsuccessful.
|
||
|
|
*/
|
||
|
|
int
|
||
|
|
prom_nbputchar(char c)
|
||
|
|
{
|
||
|
|
static char outc;
|
||
|
|
unsigned long flags;
|
||
|
|
int i = -1;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&prom_lock, flags);
|
||
|
|
switch(prom_vers) {
|
||
|
|
case PROM_V0:
|
||
|
|
i = (*(romvec->pv_nbputchar))(c);
|
||
|
|
break;
|
||
|
|
case PROM_V2:
|
||
|
|
case PROM_V3:
|
||
|
|
outc = c;
|
||
|
|
if( (*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout, &outc, 0x1) == 1)
|
||
|
|
i = 0;
|
||
|
|
else
|
||
|
|
i = -1;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
i = -1;
|
||
|
|
break;
|
||
|
|
};
|
||
|
|
restore_current();
|
||
|
|
spin_unlock_irqrestore(&prom_lock, flags);
|
||
|
|
return i; /* Ugh, we could spin forever on unsupported proms ;( */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Blocking version of get character routine above. */
|
||
|
|
char
|
||
|
|
prom_getchar(void)
|
||
|
|
{
|
||
|
|
int character;
|
||
|
|
while((character = prom_nbgetchar()) == -1) ;
|
||
|
|
return (char) character;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Blocking version of put character routine above. */
|
||
|
|
void
|
||
|
|
prom_putchar(char c)
|
||
|
|
{
|
||
|
|
while(prom_nbputchar(c) == -1) ;
|
||
|
|
return;
|
||
|
|
}
|