1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * printf.c: Internal prom library printf facility. 4 * 5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 6 */ 7 8 /* This routine is internal to the prom library, no one else should know 9 * about or use it! It's simple and smelly anyway.... 10 */ 11 12 #include <linux/kernel.h> 13 14 #include <asm/openprom.h> 15 #include <asm/oplib.h> 16 17 #ifdef CONFIG_KGDB 18 extern int kgdb_initialized; 19 #endif 20 21 static char ppbuf[1024]; 22 23 void 24 prom_printf(char *fmt, ...) 25 { 26 va_list args; 27 char ch, *bptr; 28 29 va_start(args, fmt); 30 31 #ifdef CONFIG_KGDB 32 ppbuf[0] = 'O'; 33 vsprintf(ppbuf + 1, fmt, args) + 1; 34 #else 35 vsprintf(ppbuf, fmt, args); 36 #endif 37 38 bptr = ppbuf; 39 40 #ifdef CONFIG_KGDB 41 if (kgdb_initialized) { 42 pr_info("kgdb_initialized = %d\n", kgdb_initialized); 43 putpacket(bptr, 1); 44 } else 45 #else 46 while((ch = *(bptr++)) != 0) { 47 if(ch == '\n') 48 prom_putchar('\r'); 49 50 prom_putchar(ch); 51 } 52 #endif 53 va_end(args); 54 return; 55 } 56