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