106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
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/*
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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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