kernel/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