Linux 4.8-rc8
[linux/fpc-iii.git] / arch / sparc / prom / console_32.c
blob1cfb50f4cb9c9613b041ca047660b00743a6f2a8
1 /*
2 * console.c: Routines that deal with sending and receiving IO
3 * to/from the current console device using the PROM.
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1998 Pete Zaitcev <zaitcev@yahoo.com>
7 */
9 #include <linux/types.h>
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
12 #include <asm/openprom.h>
13 #include <asm/oplib.h>
14 #include <linux/string.h>
16 extern void restore_current(void);
18 /* Non blocking put character to console device, returns -1 if
19 * unsuccessful.
21 static int prom_nbputchar(const char *buf)
23 unsigned long flags;
24 int i = -1;
26 spin_lock_irqsave(&prom_lock, flags);
27 switch(prom_vers) {
28 case PROM_V0:
29 if ((*(romvec->pv_nbputchar))(*buf))
30 i = 1;
31 break;
32 case PROM_V2:
33 case PROM_V3:
34 if ((*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout,
35 buf, 0x1) == 1)
36 i = 1;
37 break;
38 default:
39 break;
41 restore_current();
42 spin_unlock_irqrestore(&prom_lock, flags);
43 return i; /* Ugh, we could spin forever on unsupported proms ;( */
46 void prom_console_write_buf(const char *buf, int len)
48 while (len) {
49 int n = prom_nbputchar(buf);
50 if (n < 0)
51 continue;
52 len--;
53 buf++;