1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun /* console.c: Routines that deal with sending and receiving IO 3*4882a593Smuzhiyun * to/from the current console device using the PROM. 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (C) 1995 David S. Miller (davem@davemloft.net) 6*4882a593Smuzhiyun * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 7*4882a593Smuzhiyun */ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #include <linux/types.h> 10*4882a593Smuzhiyun #include <linux/kernel.h> 11*4882a593Smuzhiyun #include <linux/sched.h> 12*4882a593Smuzhiyun #include <asm/openprom.h> 13*4882a593Smuzhiyun #include <asm/oplib.h> 14*4882a593Smuzhiyun #include <linux/string.h> 15*4882a593Smuzhiyun __prom_console_write_buf(const char * buf,int len)16*4882a593Smuzhiyunstatic int __prom_console_write_buf(const char *buf, int len) 17*4882a593Smuzhiyun { 18*4882a593Smuzhiyun unsigned long args[7]; 19*4882a593Smuzhiyun int ret; 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun args[0] = (unsigned long) "write"; 22*4882a593Smuzhiyun args[1] = 3; 23*4882a593Smuzhiyun args[2] = 1; 24*4882a593Smuzhiyun args[3] = (unsigned int) prom_stdout; 25*4882a593Smuzhiyun args[4] = (unsigned long) buf; 26*4882a593Smuzhiyun args[5] = (unsigned int) len; 27*4882a593Smuzhiyun args[6] = (unsigned long) -1; 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun p1275_cmd_direct(args); 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun ret = (int) args[6]; 32*4882a593Smuzhiyun if (ret < 0) 33*4882a593Smuzhiyun return -1; 34*4882a593Smuzhiyun return ret; 35*4882a593Smuzhiyun } 36*4882a593Smuzhiyun prom_console_write_buf(const char * buf,int len)37*4882a593Smuzhiyunvoid prom_console_write_buf(const char *buf, int len) 38*4882a593Smuzhiyun { 39*4882a593Smuzhiyun while (len) { 40*4882a593Smuzhiyun int n = __prom_console_write_buf(buf, len); 41*4882a593Smuzhiyun if (n < 0) 42*4882a593Smuzhiyun continue; 43*4882a593Smuzhiyun len -= n; 44*4882a593Smuzhiyun buf += len; 45*4882a593Smuzhiyun } 46*4882a593Smuzhiyun } 47