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 /* We limit BARG_LEN to 1024 because this is the size of the 18 * 'barg_out' command line buffer in the SILO bootloader. 19 */ 20 #define BARG_LEN 1024 21 struct { 22 int bootstr_len; 23 int bootstr_valid; 24 char bootstr_buf[BARG_LEN]; 25 } bootstr_info = { 26 .bootstr_len = BARG_LEN, 27 #ifdef CONFIG_CMDLINE 28 .bootstr_valid = 1, 29 .bootstr_buf = CONFIG_CMDLINE, 30 #endif 31 }; 32 33 char * __init 34 prom_getbootargs(void) 35 { 36 /* This check saves us from a panic when bootfd patches args. */ 37 if (bootstr_info.bootstr_valid) 38 return bootstr_info.bootstr_buf; 39 prom_getstring(prom_chosen_node, "bootargs", 40 bootstr_info.bootstr_buf, BARG_LEN); 41 bootstr_info.bootstr_valid = 1; 42 return bootstr_info.bootstr_buf; 43 } 44