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m68k: generalize uboot command line support
The uboot command line support needs to be used by both MMU and no-MMU setups, but currently we only have the code in the no-MMU code paths. Move the uboot command line processing code into its own file. Add appropriate calls to it from both the MMU and no-MMU arch setup code. Signed-off-by: Greg Ungerer <gerg@linux-m68k.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
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Greg Ungerer
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Sep 26, 2016
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| /* | ||
| * uboot.c -- uboot arguments support | ||
| * | ||
| * This file is subject to the terms and conditions of the GNU General Public | ||
| * License. See the file COPYING in the main directory of this archive | ||
| * for more details. | ||
| */ | ||
|
|
||
| #include <linux/kernel.h> | ||
| #include <linux/sched.h> | ||
| #include <linux/delay.h> | ||
| #include <linux/interrupt.h> | ||
| #include <linux/fb.h> | ||
| #include <linux/module.h> | ||
| #include <linux/mm.h> | ||
| #include <linux/console.h> | ||
| #include <linux/errno.h> | ||
| #include <linux/string.h> | ||
| #include <linux/bootmem.h> | ||
| #include <linux/seq_file.h> | ||
| #include <linux/init.h> | ||
| #include <linux/initrd.h> | ||
| #include <linux/root_dev.h> | ||
| #include <linux/rtc.h> | ||
|
|
||
| #include <asm/setup.h> | ||
| #include <asm/irq.h> | ||
| #include <asm/machdep.h> | ||
| #include <asm/pgtable.h> | ||
| #include <asm/sections.h> | ||
|
|
||
| /* | ||
| * parse_uboot_commandline | ||
| * | ||
| * Copies u-boot commandline arguments and store them in the proper linux | ||
| * variables. | ||
| * | ||
| * Assumes: | ||
| * _init_sp global contains the address in the stack pointer when the | ||
| * kernel starts (see head.S::_start) | ||
| * | ||
| * U-Boot calling convention: | ||
| * (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end); | ||
| * | ||
| * _init_sp can be parsed as such | ||
| * | ||
| * _init_sp+00 = u-boot cmd after jsr into kernel (skip) | ||
| * _init_sp+04 = &kernel board_info (residual data) | ||
| * _init_sp+08 = &initrd_start | ||
| * _init_sp+12 = &initrd_end | ||
| * _init_sp+16 = &cmd_start | ||
| * _init_sp+20 = &cmd_end | ||
| * | ||
| * This also assumes that the memory locations pointed to are still | ||
| * unmodified. U-boot places them near the end of external SDRAM. | ||
| * | ||
| * Argument(s): | ||
| * commandp = the linux commandline arg container to fill. | ||
| * size = the sizeof commandp. | ||
| * | ||
| * Returns: | ||
| */ | ||
| static void __init parse_uboot_commandline(char *commandp, int size) | ||
| { | ||
| extern unsigned long _init_sp; | ||
| unsigned long *sp; | ||
| unsigned long uboot_kbd; | ||
| unsigned long uboot_initrd_start, uboot_initrd_end; | ||
| unsigned long uboot_cmd_start, uboot_cmd_end; | ||
|
|
||
| sp = (unsigned long *)_init_sp; | ||
| uboot_kbd = sp[1]; | ||
| uboot_initrd_start = sp[2]; | ||
| uboot_initrd_end = sp[3]; | ||
| uboot_cmd_start = sp[4]; | ||
| uboot_cmd_end = sp[5]; | ||
|
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| if (uboot_cmd_start && uboot_cmd_end) | ||
| strncpy(commandp, (const char *)uboot_cmd_start, size); | ||
| #if defined(CONFIG_BLK_DEV_INITRD) | ||
| if (uboot_initrd_start && uboot_initrd_end && | ||
| (uboot_initrd_end > uboot_initrd_start)) { | ||
| initrd_start = uboot_initrd_start; | ||
| initrd_end = uboot_initrd_end; | ||
| ROOT_DEV = Root_RAM0; | ||
| printk(KERN_INFO "initrd at 0x%lx:0x%lx\n", | ||
| initrd_start, initrd_end); | ||
| } | ||
| #endif /* if defined(CONFIG_BLK_DEV_INITRD) */ | ||
| } | ||
|
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| __init void process_uboot_commandline(char *commandp, int size) | ||
| { | ||
| int len, n; | ||
|
|
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| n = strnlen(commandp, size); | ||
| commandp += n; | ||
| len = size - n; | ||
| if (len) { | ||
| /* Add the whitespace separator */ | ||
| *commandp++ = ' '; | ||
| len--; | ||
| } | ||
|
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||
| parse_uboot_commandline(commandp, len); | ||
| commandp[size - 1] = 0; | ||
| } |