arch/mips/mips-boards/sim/sim_printf.c

   1 /*
   2  * Carsten Langgaard, carstenl@mips.com
   3  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
   4  *
   5  *  This program is free software; you can distribute it and/or modify it
   6  *  under the terms of the GNU General Public License (Version 2) as
   7  *  published by the Free Software Foundation.
   8  *
   9  *  This program is distributed in the hope it will be useful, but WITHOUT
  10  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  *  for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License along
  15  *  with this program; if not, write to the Free Software Foundation, Inc.,
  16  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  17  *
  18  * Putting things on the screen/serial line using YAMONs facilities.
  19  */
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/serial_reg.h>
  23 #include <linux/spinlock.h>
  24 #include <asm/io.h>
  25 #include <asm/system.h>
  26
  27 static inline unsigned int serial_in(int offset)
  28 {
  29         return inb(0x3f8 + offset);
  30 }
  31
  32 static inline void serial_out(int offset, int value)
  33 {
  34         outb(value, 0x3f8 + offset);
  35 }
  36
  37 int putPromChar(char c)
  38 {
  39         while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0)
  40                 ;
  41
  42         serial_out(UART_TX, c);
  43
  44         return 1;
  45 }
  46
  47 char getPromChar(void)
  48 {
  49         while (!(serial_in(UART_LSR) & 1))
  50                 ;
  51
  52         return serial_in(UART_RX);
  53 }
  54
  55 void prom_printf(char *fmt, ...)
  56 {
  57         va_list args;
  58         int l;
  59         char *p, *buf_end;
  60         char buf[1024];
  61
  62         va_start(args, fmt);
  63         l = vsprintf(buf, fmt, args); /* hopefully i < sizeof(buf) */
  64         va_end(args);
  65
  66         buf_end = buf + l;
  67
  68         for (p = buf; p < buf_end; p++) {
  69                 /* Crude cr/nl handling is better than none */
  70                 if (*p == '\n')
  71                         putPromChar('\r');
  72                 putPromChar(*p);
  73         }
  74 }