| 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/module.h>
|
| 14 | #include <linux/mm.h>
|
| 15 | #include <linux/console.h>
|
| 16 | #include <linux/errno.h>
|
| 17 | #include <linux/string.h>
|
| 18 | #include <linux/memblock.h>
|
| 19 | #include <linux/seq_file.h>
|
| 20 | #include <linux/init.h>
|
| 21 | #include <linux/initrd.h>
|
| 22 | #include <linux/root_dev.h>
|
| 23 | #include <linux/rtc.h>
|
| 24 |
|
| 25 | #include <asm/setup.h>
|
| 26 | #include <asm/irq.h>
|
| 27 | #include <asm/machdep.h>
|
| 28 | #include <asm/sections.h>
|
| 29 | #include <asm/bootinfo.h>
|
| 30 |
|
| 31 | |
| 32 | * parse_uboot_commandline
|
| 33 | *
|
| 34 | * Copies u-boot commandline arguments and store them in the proper linux
|
| 35 | * variables.
|
| 36 | *
|
| 37 | * Assumes:
|
| 38 | * _init_sp global contains the address in the stack pointer when the
|
| 39 | * kernel starts (see head.S::_start)
|
| 40 | *
|
| 41 | * U-Boot calling convention:
|
| 42 | * (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
|
| 43 | *
|
| 44 | * _init_sp can be parsed as such
|
| 45 | *
|
| 46 | * _init_sp+00 = u-boot cmd after jsr into kernel (skip)
|
| 47 | * _init_sp+04 = &kernel board_info (residual data)
|
| 48 | * _init_sp+08 = &initrd_start
|
| 49 | * _init_sp+12 = &initrd_end
|
| 50 | * _init_sp+16 = &cmd_start
|
| 51 | * _init_sp+20 = &cmd_end
|
| 52 | *
|
| 53 | * This also assumes that the memory locations pointed to are still
|
| 54 | * unmodified. U-boot places them near the end of external SDRAM.
|
| 55 | *
|
| 56 | * Argument(s):
|
| 57 | * commandp = the linux commandline arg container to fill.
|
| 58 | * size = the sizeof commandp.
|
| 59 | *
|
| 60 | * Returns:
|
| 61 |
|
| 62 | static void __init parse_uboot_commandline(char *commandp, int size)
|
| 63 | {
|
| 64 | extern unsigned long _init_sp;
|
| 65 | unsigned long *sp;
|
| 66 | unsigned long uboot_cmd_start, uboot_cmd_end;
|
| 67 | #if defined(CONFIG_BLK_DEV_INITRD)
|
| 68 | unsigned long uboot_initrd_start, uboot_initrd_end;
|
| 69 | #endif
|
| 70 |
|
| 71 | sp = (unsigned long *)_init_sp;
|
| 72 | uboot_cmd_start = sp[4];
|
| 73 | uboot_cmd_end = sp[5];
|
| 74 |
|
| 75 | if (uboot_cmd_start && uboot_cmd_end)
|
| 76 | strscpy(commandp, (const char *)uboot_cmd_start, size);
|
| 77 |
|
| 78 | #if defined(CONFIG_BLK_DEV_INITRD)
|
| 79 | uboot_initrd_start = sp[2];
|
| 80 | uboot_initrd_end = sp[3];
|
| 81 |
|
| 82 | if (uboot_initrd_start && uboot_initrd_end &&
|
| 83 | (uboot_initrd_end > uboot_initrd_start)) {
|
| 84 | initrd_start = uboot_initrd_start;
|
| 85 | initrd_end = uboot_initrd_end;
|
| 86 | ROOT_DEV = Root_RAM0;
|
| 87 | pr_info("initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
|
| 88 | }
|
| 89 | #endif
|
| 90 | }
|
| 91 |
|
| 92 | __init void process_uboot_commandline(char *commandp, int size)
|
| 93 | {
|
| 94 | int len, n;
|
| 95 |
|
| 96 | n = strnlen(commandp, size);
|
| 97 | commandp += n;
|
| 98 | len = size - n;
|
| 99 | if (len) {
|
| 100 |
|
| 101 | *commandp++ = ' ';
|
| 102 | len--;
|
| 103 | }
|
| 104 |
|
| 105 | parse_uboot_commandline(commandp, len);
|
| 106 | commandp[len - 1] = 0;
|
| 107 | }
|