1 /* 2 * bootstr.c: Boot string/argument acquisition from the PROM. 3 * 4 * Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu) 5 * Copyright(C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 6 */ 7 8 #include <linux/string.h> 9 #include <linux/init.h> 10 #include <asm/oplib.h> 11 12 /* WARNING: The boot loader knows that these next three variables come one right 13 * after another in the .data section. Do not move this stuff into 14 * the .bss section or it will break things. 15 */ 16 17 #define BARG_LEN 256 18 struct { 19 int bootstr_len; 20 int bootstr_valid; 21 char bootstr_buf[BARG_LEN]; 22 } bootstr_info = { 23 .bootstr_len = BARG_LEN, 24 #ifdef CONFIG_CMDLINE 25 .bootstr_valid = 1, 26 .bootstr_buf = CONFIG_CMDLINE, 27 #endif 28 }; 29 30 char * __init 31 prom_getbootargs(void) 32 { 33 /* This check saves us from a panic when bootfd patches args. */ 34 if (bootstr_info.bootstr_valid) 35 return bootstr_info.bootstr_buf; 36 prom_getstring(prom_chosen_node, "bootargs", 37 bootstr_info.bootstr_buf, BARG_LEN); 38 bootstr_info.bootstr_valid = 1; 39 return bootstr_info.bootstr_buf; 40 } 41