1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * linux/arch/arm/boot/bootp/init.S
4 *
5 * Copyright (C) 2000-2003 Russell King.
6 *
7 * "Header" file for splitting kernel + initr
8 * r0 through to r3 straight through.
9 *
10 * This demonstrates how to append code to th
11 * zImage, and boot the kernel without copyin
12 * example would be simpler; if we didn't hav
13 * size immediately following the kernel, we
14 * a binary blob, and concatenate the zImage
15 */
16 .section .start, "ax"
17 .type _start, #function
18 .globl _start
19
20 _start: add lr, pc, #-0x8
21 adr r13, data
22 ldmia r13!, {r4-r6}
23 add r4, r4, lr
24 bl move
25
26 /*
27 * Setup the initrd parameters to pass to the
28 * passed in via the tagged list.
29 */
30 ldmia r13, {r5-r9}
31
32
33
34
35
36
37 ldr r10, [r9, #4]
38 teq r10, r5
39 /*
40 * If we didn't find a valid tag list, create
41 */
42 movne r10, #0
43 movne r4, #2
44 stmiane r9, {r4, r5, r10}
45
46 /*
47 * find the end of the tag list, and then add
48 * If there is already an INITRD tag, then we
49 * tag takes precedence.
50 */
51 taglist: ldr r10, [r9, #0]
52 teq r10, #0
53 addne r9, r9, r10, lsl #2
54 bne taglist
55
56 mov r5, #4
57 stmia r9, {r5, r6, r7, r8, r
58 b kernel_start
59
60 /*
61 * Move the block of memory length r6 from add
62 */
63 move: ldmia r4!, {r7 - r10}
64 stmia r5!, {r7 - r10}
65 ldmia r4!, {r7 - r10}
66 stmia r5!, {r7 - r10}
67 subs r6, r6, #8 * 4
68 bcs move
69 mov pc, lr
70
71 .size _start, . - _start
72
73 .align
74
75 .type data,#object
76 data: .word initrd_start
77 .word initrd_phys
78 .word initrd_size
79
80 .word 0x54410001
81 .word 0x54420005
82 .word initrd_phys
83 .word initrd_size
84 .word params_phys
85 .size data, . - data
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