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// 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;
}
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