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git01.mediatek.com / filogic / uboot / 80877fa33ca2623eeb5d3e080847605b188131bd / . / board / nokia / rx51 / lowlevel_init.S
blob: 1cf8f8d8b2f7bb664806bd6c9892b95d17eda27f [file] [log] [blame]
Tom Rini10e47792018-05-06 17:58:06 -0400[diff] [blame]1/* SPDX-License-Identifier: GPL-2.0+ */
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]2/*
3 * (C) Copyright 2011-2012
Pali Rohár10a953d2020-04-01 00:35:08 +0200[diff] [blame]4 * Pali Rohár <pali@kernel.org>
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]5 */
6
7#include <config.h>
8
Pali Rohárb043e872022-08-11 22:27:24 +0200[diff] [blame]9kernoffs: /* offset of kernel image from this address */
10 .word KERNEL_OFFSET - (. - CONFIG_SYS_TEXT_BASE)
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]11
12kernaddr: /* address of kernel after copying */
13 .word KERNEL_ADDRESS
14
15kernsize: /* maximal size of kernel image */
16 .word KERNEL_MAXSIZE
17
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]18imagesize: /* maximal size of image */
19 .word IMAGE_MAXSIZE
20
21ih_magic: /* IH_MAGIC in big endian from include/image.h */
22 .word 0x56190527
23
Pali Rohár0a8825c2021-06-18 15:27:03 +0200[diff] [blame]24z_magic: /* LINUX_ARM_ZIMAGE_MAGIC */
25 .word 0x016f2818
26
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]27/*
28 * Routine: save_boot_params (called after reset from start.S)
29 * Description: Copy attached kernel to address KERNEL_ADDRESS
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]30 */
31
32.global save_boot_params
33save_boot_params:
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]34
Pali Rohárc1aec222022-08-11 22:27:22 +0200[diff] [blame]35/*
36 * Copy valid attached kernel to absolute address KERNEL_ADDRESS
37 *
38 * Nokia X-Loader is loading secondary image to address 0x80400000.
39 * NOLO is loading boot image to random place, so it doesn't really
40 * matter what is set in CONFIG_SYS_TEXT_BASE. We have to detect
41 * KERNEL_OFFSET from the current execution address and copy it to
42 * absolute address KERNEL_ADDRESS.
43 *
44 * Note that U-Boot has to be compiled with CONFIG_POSITION_INDEPENDENT
45 * because it is loaded at random address and not to the fixed address
46 * (CONFIG_SYS_TEXT_BASE).
47 */
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]48
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]49 /* r0 - start of kernel before */
Pali Rohárb043e872022-08-11 22:27:24 +0200[diff] [blame]50 adr r0, kernoffs /* r0 - current address of kernoffs section */
51 ldr r1, kernoffs /* r1 - offset of kernel image from kernoffs section */
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]52 add r0, r0, r1
53
54 /* r3 - start of kernel after */
55 ldr r3, kernaddr
56
57 /* r2 - end of kernel after */
58 ldr r1, kernsize
59 add r2, r3, r1
60
61 /* r1 - end of kernel before */
62 add r1, r0, r1
63
64 /* remove header in target kernel */
65 mov r5, #0
Pali Rohárf8a6c902022-08-11 22:27:21 +0200[diff] [blame]66 str r5, [r3] /* remove 4 bytes header of kernel uImage */
67 str r5, [r3, #36] /* remove 4 bytes header of kernel zImage */
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]68
69 /* check for valid kernel uImage */
70 ldr r4, [r0] /* r4 - 4 bytes header of kernel */
71 ldr r5, ih_magic /* r5 - IH_MAGIC */
72 cmp r4, r5
Pali Rohár0a8825c2021-06-18 15:27:03 +0200[diff] [blame]73 beq copy_kernel_loop
74
75 /* check for valid kernel zImage */
76 ldr r4, [r0, #36] /* r4 - 4 bytes header of kernel at offset 36 */
77 ldr r5, z_magic /* r5 - LINUX_ARM_ZIMAGE_MAGIC */
78 cmp r4, r5
Pali Rohára4001fd2022-09-04 03:28:59 +0200[diff] [blame]79 bne skip_copy /* skip if invalid image */
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]80
81copy_kernel_loop:
82 ldmdb r1!, {r3 - r10}
83 stmdb r2!, {r3 - r10}
84 cmp r1, r0
85 bhi copy_kernel_loop
86
Pali Rohárf8a6c902022-08-11 22:27:21 +0200[diff] [blame]87 /* remove header in source kernel image */
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]88 mov r5, #0
Pali Rohár0a8825c2021-06-18 15:27:03 +0200[diff] [blame]89 str r5, [r0] /* remove 4 bytes header of kernel uImage */
90 str r5, [r0, #36] /* remove 4 bytes header of kernel zImage */
Pali Rohár248ef0a2012-10-29 07:54:01 +0000[diff] [blame]91
Pali Rohára4001fd2022-09-04 03:28:59 +0200[diff] [blame]92skip_copy:
93
Pali Rohárc1aec222022-08-11 22:27:22 +0200[diff] [blame]94 /* Returns */
95 b save_boot_params_ret