Commit | Line | Data |
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aa5ac789 GU |
1 | /* |
2 | * uboot.c -- uboot arguments support | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file COPYING in the main directory of this archive | |
6 | * for more details. | |
7 | */ | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/delay.h> | |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/fb.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/console.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/string.h> | |
57c8a661 | 19 | #include <linux/memblock.h> |
aa5ac789 GU |
20 | #include <linux/seq_file.h> |
21 | #include <linux/init.h> | |
22 | #include <linux/initrd.h> | |
23 | #include <linux/root_dev.h> | |
24 | #include <linux/rtc.h> | |
25 | ||
26 | #include <asm/setup.h> | |
27 | #include <asm/irq.h> | |
28 | #include <asm/machdep.h> | |
29 | #include <asm/pgtable.h> | |
30 | #include <asm/sections.h> | |
31 | ||
32 | /* | |
33 | * parse_uboot_commandline | |
34 | * | |
35 | * Copies u-boot commandline arguments and store them in the proper linux | |
36 | * variables. | |
37 | * | |
38 | * Assumes: | |
39 | * _init_sp global contains the address in the stack pointer when the | |
40 | * kernel starts (see head.S::_start) | |
41 | * | |
42 | * U-Boot calling convention: | |
43 | * (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end); | |
44 | * | |
45 | * _init_sp can be parsed as such | |
46 | * | |
47 | * _init_sp+00 = u-boot cmd after jsr into kernel (skip) | |
48 | * _init_sp+04 = &kernel board_info (residual data) | |
49 | * _init_sp+08 = &initrd_start | |
50 | * _init_sp+12 = &initrd_end | |
51 | * _init_sp+16 = &cmd_start | |
52 | * _init_sp+20 = &cmd_end | |
53 | * | |
54 | * This also assumes that the memory locations pointed to are still | |
55 | * unmodified. U-boot places them near the end of external SDRAM. | |
56 | * | |
57 | * Argument(s): | |
58 | * commandp = the linux commandline arg container to fill. | |
59 | * size = the sizeof commandp. | |
60 | * | |
61 | * Returns: | |
62 | */ | |
63 | static void __init parse_uboot_commandline(char *commandp, int size) | |
64 | { | |
65 | extern unsigned long _init_sp; | |
66 | unsigned long *sp; | |
67 | unsigned long uboot_kbd; | |
68 | unsigned long uboot_initrd_start, uboot_initrd_end; | |
69 | unsigned long uboot_cmd_start, uboot_cmd_end; | |
70 | ||
71 | sp = (unsigned long *)_init_sp; | |
72 | uboot_kbd = sp[1]; | |
73 | uboot_initrd_start = sp[2]; | |
74 | uboot_initrd_end = sp[3]; | |
75 | uboot_cmd_start = sp[4]; | |
76 | uboot_cmd_end = sp[5]; | |
77 | ||
78 | if (uboot_cmd_start && uboot_cmd_end) | |
79 | strncpy(commandp, (const char *)uboot_cmd_start, size); | |
80 | #if defined(CONFIG_BLK_DEV_INITRD) | |
81 | if (uboot_initrd_start && uboot_initrd_end && | |
82 | (uboot_initrd_end > uboot_initrd_start)) { | |
83 | initrd_start = uboot_initrd_start; | |
84 | initrd_end = uboot_initrd_end; | |
85 | ROOT_DEV = Root_RAM0; | |
7c79e1ee | 86 | pr_info("initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); |
aa5ac789 GU |
87 | } |
88 | #endif /* if defined(CONFIG_BLK_DEV_INITRD) */ | |
89 | } | |
90 | ||
91 | __init void process_uboot_commandline(char *commandp, int size) | |
92 | { | |
93 | int len, n; | |
94 | ||
95 | n = strnlen(commandp, size); | |
96 | commandp += n; | |
97 | len = size - n; | |
98 | if (len) { | |
99 | /* Add the whitespace separator */ | |
100 | *commandp++ = ' '; | |
101 | len--; | |
102 | } | |
103 | ||
104 | parse_uboot_commandline(commandp, len); | |
381fdd62 | 105 | commandp[len - 1] = 0; |
aa5ac789 | 106 | } |