Linux Kernel  3.7.1
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bootstr_64.c
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1 /*
2  * bootstr.c: Boot string/argument acquisition from the PROM.
3  *
4  * Copyright(C) 1995 David S. Miller ([email protected])
5  * Copyright(C) 1996,1998 Jakub Jelinek ([email protected])
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 #define BARG_LEN 256
18 struct {
22 } bootstr_info = {
23  .bootstr_len = BARG_LEN,
24 #ifdef CONFIG_CMDLINE
25  .bootstr_valid = 1,
26  .bootstr_buf = CONFIG_CMDLINE,
27 #endif
28 };
29 
30 char * __init
32 {
33  /* This check saves us from a panic when bootfd patches args. */
34  if (bootstr_info.bootstr_valid)
35  return bootstr_info.bootstr_buf;
36  prom_getstring(prom_chosen_node, "bootargs",
37  bootstr_info.bootstr_buf, BARG_LEN);
38  bootstr_info.bootstr_valid = 1;
39  return bootstr_info.bootstr_buf;
40 }