| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * bootstr.c: Boot string/argument acquisition from the PROM. |
| * |
| * Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu) |
| * Copyright(C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| */ |
| |
| #include <linux/string.h> |
| #include <linux/init.h> |
| #include <asm/oplib.h> |
| |
| /* WARNING: The boot loader knows that these next three variables come one right |
| * after another in the .data section. Do not move this stuff into |
| * the .bss section or it will break things. |
| */ |
| |
| /* We limit BARG_LEN to 1024 because this is the size of the |
| * 'barg_out' command line buffer in the SILO bootloader. |
| */ |
| #define BARG_LEN 1024 |
| struct { |
| int bootstr_len; |
| int bootstr_valid; |
| char bootstr_buf[BARG_LEN]; |
| } bootstr_info = { |
| .bootstr_len = BARG_LEN, |
| #ifdef CONFIG_CMDLINE |
| .bootstr_valid = 1, |
| .bootstr_buf = CONFIG_CMDLINE, |
| #endif |
| }; |
| |
| char * __init |
| prom_getbootargs(void) |
| { |
| /* This check saves us from a panic when bootfd patches args. */ |
| if (bootstr_info.bootstr_valid) |
| return bootstr_info.bootstr_buf; |
| prom_getstring(prom_chosen_node, "bootargs", |
| bootstr_info.bootstr_buf, BARG_LEN); |
| bootstr_info.bootstr_valid = 1; |
| return bootstr_info.bootstr_buf; |
| } |
