1/*
 2 * relocate_kernel.S - put the kernel image in place to boot
 3 */
 4
 
 
 
 5#include <asm/kexec.h>
 6
 7	.globl relocate_new_kernel
 8relocate_new_kernel:
 9
10	ldr	r0,kexec_indirection_page
11	ldr	r1,kexec_start_address
 
 
 
12
13	/*
14	 * If there is no indirection page (we are doing crashdumps)
15	 * skip any relocation.
16	 */
17	cmp	r0, #0
18	beq	2f
19
200:	/* top, read another word for the indirection page */
21	ldr	r3, [r0],#4
22
23	/* Is it a destination page. Put destination address to r4 */
24	tst	r3,#1,0
25	beq	1f
26	bic	r4,r3,#1
27	b	0b
281:
29	/* Is it an indirection page */
30	tst	r3,#2,0
31	beq	1f
32	bic	r0,r3,#2
33	b	0b
341:
35
36	/* are we done ? */
37	tst	r3,#4,0
38	beq	1f
39	b	2f
40
411:
42	/* is it source ? */
43	tst	r3,#8,0
44	beq	0b
45	bic r3,r3,#8
46	mov r6,#1024
479:
48	ldr r5,[r3],#4
49	str r5,[r4],#4
50	subs r6,r6,#1
51	bne 9b
52	b 0b
53
542:
55	/* Jump to relocated kernel */
56	mov lr,r1
57	mov r0,#0
58	ldr r1,kexec_mach_type
59	ldr r2,kexec_boot_atags
60 ARM(	mov pc, lr	)
61 THUMB(	bx lr		)
62
63	.align
64
65	.globl kexec_start_address
66kexec_start_address:
67	.long	0x0
68
69	.globl kexec_indirection_page
70kexec_indirection_page:
71	.long	0x0
72
73	.globl kexec_mach_type
74kexec_mach_type:
75	.long	0x0
76
77	/* phy addr of the atags for the new kernel */
78	.globl kexec_boot_atags
79kexec_boot_atags:
80	.long	0x0
81
 
82relocate_new_kernel_end:
83
84	.globl relocate_new_kernel_size
85relocate_new_kernel_size:
86	.long relocate_new_kernel_end - relocate_new_kernel
87
88

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * relocate_kernel.S - put the kernel image in place to boot
 4 */
 5
 6#include <linux/linkage.h>
 7#include <asm/assembler.h>
 8#include <asm/asm-offsets.h>
 9#include <asm/kexec.h>
10
11	.align	3	/* not needed for this code, but keeps fncpy() happy */
 
12
13ENTRY(relocate_new_kernel)
14
15	adr	r7, relocate_new_kernel_end
16	ldr	r0, [r7, #KEXEC_INDIR_PAGE]
17	ldr	r1, [r7, #KEXEC_START_ADDR]
18
19	/*
20	 * If there is no indirection page (we are doing crashdumps)
21	 * skip any relocation.
22	 */
23	cmp	r0, #0
24	beq	2f
25
260:	/* top, read another word for the indirection page */
27	ldr	r3, [r0],#4
28
29	/* Is it a destination page. Put destination address to r4 */
30	tst	r3,#1
31	beq	1f
32	bic	r4,r3,#1
33	b	0b
341:
35	/* Is it an indirection page */
36	tst	r3,#2
37	beq	1f
38	bic	r0,r3,#2
39	b	0b
401:
41
42	/* are we done ? */
43	tst	r3,#4
44	beq	1f
45	b	2f
46
471:
48	/* is it source ? */
49	tst	r3,#8
50	beq	0b
51	bic r3,r3,#8
52	mov r6,#1024
539:
54	ldr r5,[r3],#4
55	str r5,[r4],#4
56	subs r6,r6,#1
57	bne 9b
58	b 0b
59
602:
61	/* Jump to relocated kernel */
62	mov	lr, r1
63	mov	r0, #0
64	ldr	r1, [r7, #KEXEC_MACH_TYPE]
65	ldr	r2, [r7, #KEXEC_R2]
66 ARM(	ret	lr	)
67 THUMB(	bx	lr	)
68
69ENDPROC(relocate_new_kernel)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
70
71	.align	3
72relocate_new_kernel_end:
73
74	.globl relocate_new_kernel_size
75relocate_new_kernel_size:
76	.long relocate_new_kernel_end - relocate_new_kernel
77
78