GNU Linux-libre 4.4.294-gnu1
[releases.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 <linux/string.h>
15
16 extern void restore_current(void);
17
18 /* Non blocking put character to console device, returns -1 if
19  * unsuccessful.
20  */
21 static int prom_nbputchar(const char *buf)
22 {
23         unsigned long flags;
24         int i = -1;
25
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;
40         }
41         restore_current();
42         spin_unlock_irqrestore(&prom_lock, flags);
43         return i; /* Ugh, we could spin forever on unsupported proms ;( */
44 }
45
46 void prom_console_write_buf(const char *buf, int len)
47 {
48         while (len) {
49                 int n = prom_nbputchar(buf);
50                 if (n < 0)
51                         continue;
52                 len--;
53                 buf++;
54         }
55 }
56