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105 lines
2.7 KiB
105 lines
2.7 KiB
/* |
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* uboot.c -- uboot arguments support |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file COPYING in the main directory of this archive |
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* for more details. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/sched.h> |
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#include <linux/delay.h> |
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#include <linux/interrupt.h> |
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#include <linux/fb.h> |
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#include <linux/module.h> |
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#include <linux/mm.h> |
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#include <linux/console.h> |
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#include <linux/errno.h> |
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#include <linux/string.h> |
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#include <linux/memblock.h> |
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#include <linux/seq_file.h> |
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#include <linux/init.h> |
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#include <linux/initrd.h> |
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#include <linux/root_dev.h> |
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#include <linux/rtc.h> |
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#include <asm/setup.h> |
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#include <asm/irq.h> |
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#include <asm/machdep.h> |
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#include <asm/sections.h> |
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/* |
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* parse_uboot_commandline |
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* |
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* Copies u-boot commandline arguments and store them in the proper linux |
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* variables. |
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* |
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* Assumes: |
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* _init_sp global contains the address in the stack pointer when the |
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* kernel starts (see head.S::_start) |
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* |
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* U-Boot calling convention: |
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* (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end); |
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* |
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* _init_sp can be parsed as such |
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* |
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* _init_sp+00 = u-boot cmd after jsr into kernel (skip) |
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* _init_sp+04 = &kernel board_info (residual data) |
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* _init_sp+08 = &initrd_start |
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* _init_sp+12 = &initrd_end |
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* _init_sp+16 = &cmd_start |
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* _init_sp+20 = &cmd_end |
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* |
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* This also assumes that the memory locations pointed to are still |
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* unmodified. U-boot places them near the end of external SDRAM. |
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* |
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* Argument(s): |
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* commandp = the linux commandline arg container to fill. |
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* size = the sizeof commandp. |
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* |
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* Returns: |
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*/ |
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static void __init parse_uboot_commandline(char *commandp, int size) |
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{ |
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extern unsigned long _init_sp; |
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unsigned long *sp; |
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unsigned long uboot_kbd; |
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unsigned long uboot_initrd_start, uboot_initrd_end; |
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unsigned long uboot_cmd_start, uboot_cmd_end; |
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sp = (unsigned long *)_init_sp; |
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uboot_kbd = sp[1]; |
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uboot_initrd_start = sp[2]; |
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uboot_initrd_end = sp[3]; |
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uboot_cmd_start = sp[4]; |
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uboot_cmd_end = sp[5]; |
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if (uboot_cmd_start && uboot_cmd_end) |
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strncpy(commandp, (const char *)uboot_cmd_start, size); |
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#if defined(CONFIG_BLK_DEV_INITRD) |
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if (uboot_initrd_start && uboot_initrd_end && |
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(uboot_initrd_end > uboot_initrd_start)) { |
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initrd_start = uboot_initrd_start; |
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initrd_end = uboot_initrd_end; |
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ROOT_DEV = Root_RAM0; |
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pr_info("initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); |
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} |
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#endif /* if defined(CONFIG_BLK_DEV_INITRD) */ |
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} |
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__init void process_uboot_commandline(char *commandp, int size) |
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{ |
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int len, n; |
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n = strnlen(commandp, size); |
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commandp += n; |
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len = size - n; |
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if (len) { |
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/* Add the whitespace separator */ |
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*commandp++ = ' '; |
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len--; |
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} |
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parse_uboot_commandline(commandp, len); |
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commandp[len - 1] = 0; |
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}
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