b05e3db5fa63c766718c79578d200d6ad99967b6
[linux-2.6.git] / arch / sparc / prom / console_32.c
1 /*
2  * console.c: Routines that deal with sending and receiving IO
3  *            to/from the current console device using the PROM.
4  *
5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6  * Copyright (C) 1998 Pete Zaitcev <zaitcev@yahoo.com>
7  */
8
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 <asm/system.h>
15 #include <linux/string.h>
16
17 extern void restore_current(void);
18
19 /* Non blocking put character to console device, returns -1 if
20  * unsuccessful.
21  */
22 static int prom_nbputchar(const char *buf)
23 {
24         unsigned long flags;
25         int i = -1;
26
27         spin_lock_irqsave(&prom_lock, flags);
28         switch(prom_vers) {
29         case PROM_V0:
30                 if ((*(romvec->pv_nbputchar))(*buf))
31                         i = 1;
32                 break;
33         case PROM_V2:
34         case PROM_V3:
35                 if ((*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout,
36                                                           buf, 0x1) == 1)
37                         i = 1;
38                 break;
39         default:
40                 break;
41         };
42         restore_current();
43         spin_unlock_irqrestore(&prom_lock, flags);
44         return i; /* Ugh, we could spin forever on unsupported proms ;( */
45 }
46
47 void prom_console_write_buf(const char *buf, int len)
48 {
49         while (len) {
50                 int n = prom_nbputchar(buf);
51                 if (n < 0)
52                         continue;
53                 len--;
54                 buf++;
55         }
56 }
57