| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* |
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| 3 | * bootstr.c: Boot string/argument acquisition from the PROM. |
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| 4 | * |
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| 5 | * Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu) |
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| 6 | * Copyright(C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
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| 7 | */ |
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| 8 | |
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| 9 | #include <linux/string.h> |
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| 10 | #include <linux/init.h> |
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| 11 | #include <asm/oplib.h> |
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| 12 | |
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| 13 | /* WARNING: The boot loader knows that these next three variables come one right |
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| 14 | * after another in the .data section. Do not move this stuff into |
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| 15 | * the .bss section or it will break things. |
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| 16 | */ |
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| 17 | |
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| 18 | /* We limit BARG_LEN to 1024 because this is the size of the |
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| 19 | * 'barg_out' command line buffer in the SILO bootloader. |
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| 20 | */ |
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| 21 | #define BARG_LEN 1024 |
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| 22 | struct { |
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| 23 | int bootstr_len; |
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| 24 | int bootstr_valid; |
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| 25 | char bootstr_buf[BARG_LEN]; |
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| 26 | } bootstr_info = { |
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| 27 | .bootstr_len = BARG_LEN, |
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| 28 | #ifdef CONFIG_CMDLINE |
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| 29 | .bootstr_valid = 1, |
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| 30 | .bootstr_buf = CONFIG_CMDLINE, |
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| 31 | #endif |
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| 32 | }; |
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| 33 | |
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| 34 | char * __init |
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| 35 | prom_getbootargs(void) |
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| 36 | { |
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| 37 | /* This check saves us from a panic when bootfd patches args. */ |
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| 38 | if (bootstr_info.bootstr_valid) |
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| 39 | return bootstr_info.bootstr_buf; |
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| 40 | prom_getstring(prom_chosen_node, "bootargs" , |
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| 41 | bootstr_info.bootstr_buf, BARG_LEN); |
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| 42 | bootstr_info.bootstr_valid = 1; |
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| 43 | return bootstr_info.bootstr_buf; |
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| 44 | } |
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| 45 | |
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