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 <linux/string.h> 14 15 static int __prom_console_write_buf(const char *buf, int len) 16 { 17 unsigned long args[7]; 18 int ret; 19 20 args[0] = (unsigned long) "write"; 21 args[1] = 3; 22 args[2] = 1; 23 args[3] = (unsigned int) prom_stdout; 24 args[4] = (unsigned long) buf; 25 args[5] = (unsigned int) len; 26 args[6] = (unsigned long) -1; 27 28 p1275_cmd_direct(args); 29 30 ret = (int) args[6]; 31 if (ret < 0) 32 return -1; 33 return ret; 34 } 35 36 void prom_console_write_buf(const char *buf, int len) 37 { 38 while (len) { 39 int n = __prom_console_write_buf(buf, len); 40 if (n < 0) 41 continue; 42 len -= n; 43 buf += len; 44 } 45 } 46