^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * uboot.c -- uboot arguments support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * License. See the file COPYING in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/fb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/console.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/initrd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/root_dev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/rtc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <asm/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/machdep.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * parse_uboot_commandline
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * Copies u-boot commandline arguments and store them in the proper linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * variables.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * Assumes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * _init_sp global contains the address in the stack pointer when the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * kernel starts (see head.S::_start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * U-Boot calling convention:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * _init_sp can be parsed as such
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * _init_sp+00 = u-boot cmd after jsr into kernel (skip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * _init_sp+04 = &kernel board_info (residual data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * _init_sp+08 = &initrd_start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * _init_sp+12 = &initrd_end
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * _init_sp+16 = &cmd_start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * _init_sp+20 = &cmd_end
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * This also assumes that the memory locations pointed to are still
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * unmodified. U-boot places them near the end of external SDRAM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * Argument(s):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * commandp = the linux commandline arg container to fill.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * size = the sizeof commandp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * Returns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static void __init parse_uboot_commandline(char *commandp, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) extern unsigned long _init_sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) unsigned long *sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) unsigned long uboot_kbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) unsigned long uboot_initrd_start, uboot_initrd_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) unsigned long uboot_cmd_start, uboot_cmd_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) sp = (unsigned long *)_init_sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) uboot_kbd = sp[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) uboot_initrd_start = sp[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) uboot_initrd_end = sp[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) uboot_cmd_start = sp[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) uboot_cmd_end = sp[5];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (uboot_cmd_start && uboot_cmd_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) strncpy(commandp, (const char *)uboot_cmd_start, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #if defined(CONFIG_BLK_DEV_INITRD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (uboot_initrd_start && uboot_initrd_end &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) (uboot_initrd_end > uboot_initrd_start)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) initrd_start = uboot_initrd_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) initrd_end = uboot_initrd_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) ROOT_DEV = Root_RAM0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) pr_info("initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) #endif /* if defined(CONFIG_BLK_DEV_INITRD) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) __init void process_uboot_commandline(char *commandp, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) int len, n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) n = strnlen(commandp, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) commandp += n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) len = size - n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /* Add the whitespace separator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) *commandp++ = ' ';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) parse_uboot_commandline(commandp, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) commandp[len - 1] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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