projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 88278ca2 | 1 | /* |
| 1da177e4 LT |
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> | |
| 1da177e4 | 13 | #include <asm/oplib.h> |
| 1da177e4 LT |
14 | #include <linux/string.h> |
| 15 | ||
| 16 | extern void restore_current(void); | |
| 17 | ||
| 1da177e4 LT |
18 | /* Non blocking put character to console device, returns -1 if |
| 19 | * unsuccessful. | |
| 20 | */ | |
| e62cac1f | 21 | static int prom_nbputchar(const char *buf) |
| 1da177e4 | 22 | { |
| 1da177e4 LT |
23 | unsigned long flags; |
| 24 | int i = -1; | |
| 25 | ||
| 26 | spin_lock_irqsave(&prom_lock, flags); | |
| 27 | switch(prom_vers) { | |
| 28 | case PROM_V0: | |
| 15433768 JC |
29 | if ((*(romvec->pv_nbputchar))(*buf)) |
| 30 | i = 1; | |
| 1da177e4 LT |
31 | break; |
| 32 | case PROM_V2: | |
| 33 | case PROM_V3: | |
| e62cac1f DM |
34 | if ((*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout, |
| 35 | buf, 0x1) == 1) | |
| 15433768 | 36 | i = 1; |
| 1da177e4 LT |
37 | break; |
| 38 | default: | |
| 1da177e4 | 39 | break; |
| 6cb79b3f | 40 | } |
| 1da177e4 LT |
41 | restore_current(); |
| 42 | spin_unlock_irqrestore(&prom_lock, flags); | |
| 43 | return i; /* Ugh, we could spin forever on unsupported proms ;( */ | |
| 44 | } | |
| 45 | ||
| 595a251c | 46 | void prom_console_write_buf(const char *buf, int len) |
| 1da177e4 | 47 | { |
| 595a251c DM |
48 | while (len) { |
| 49 | int n = prom_nbputchar(buf); | |
| 15433768 | 50 | if (n < 0) |
| 595a251c DM |
51 | continue; |
| 52 | len--; | |
| 53 | buf++; | |
| e62cac1f | 54 | } |
| 1da177e4 | 55 | } |
| 595a251c | 56 |