1/* console.c: Routines that deal with sending and receiving IO 2 * to/from the current console device using the PROM. 3 * 4 * Copyright (C) 1995 David S. Miller (davem@davemloft.net) 5 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 6 */ 7 8#include <linux/types.h> 9#include <linux/kernel.h> 10#include <linux/sched.h> 11#include <asm/openprom.h> 12#include <asm/oplib.h> 13#include <asm/system.h> 14#include <linux/string.h> 15 16extern int prom_stdin, prom_stdout; 17 18static int __prom_console_write_buf(const char *buf, int len) 19{ 20 unsigned long args[7]; 21 int ret; 22 23 args[0] = (unsigned long) "write"; 24 args[1] = 3; 25 args[2] = 1; 26 args[3] = (unsigned int) prom_stdout; 27 args[4] = (unsigned long) buf; 28 args[5] = (unsigned int) len; 29 args[6] = (unsigned long) -1; 30 31 p1275_cmd_direct(args); 32 33 ret = (int) args[6]; 34 if (ret < 0) 35 return -1; 36 return ret; 37} 38 39void prom_console_write_buf(const char *buf, int len) 40{ 41 while (len) { 42 int n = __prom_console_write_buf(buf, len); 43 if (n < 0) 44 continue; 45 len -= n; 46 buf += len; 47 } 48} 49