1/*
 2 * relocate_kernel.S - put the kernel image in place to boot
 3 */
 4
 5#include <linux/linkage.h>
 6#include <asm/assembler.h>
 
 7#include <asm/kexec.h>
 8
 9	.align	3	/* not needed for this code, but keeps fncpy() happy */
10
11ENTRY(relocate_new_kernel)
12
13	ldr	r0,kexec_indirection_page
14	ldr	r1,kexec_start_address
 
15
16	/*
17	 * If there is no indirection page (we are doing crashdumps)
18	 * skip any relocation.
19	 */
20	cmp	r0, #0
21	beq	2f
22
230:	/* top, read another word for the indirection page */
24	ldr	r3, [r0],#4
25
26	/* Is it a destination page. Put destination address to r4 */
27	tst	r3,#1,0
28	beq	1f
29	bic	r4,r3,#1
30	b	0b
311:
32	/* Is it an indirection page */
33	tst	r3,#2,0
34	beq	1f
35	bic	r0,r3,#2
36	b	0b
371:
38
39	/* are we done ? */
40	tst	r3,#4,0
41	beq	1f
42	b	2f
43
441:
45	/* is it source ? */
46	tst	r3,#8,0
47	beq	0b
48	bic r3,r3,#8
49	mov r6,#1024
509:
51	ldr r5,[r3],#4
52	str r5,[r4],#4
53	subs r6,r6,#1
54	bne 9b
55	b 0b
56
572:
58	/* Jump to relocated kernel */
59	mov lr,r1
60	mov r0,#0
61	ldr r1,kexec_mach_type
62	ldr r2,kexec_boot_atags
63 ARM(	ret lr	)
64 THUMB(	bx lr		)
65
66	.align
67
68	.globl kexec_start_address
69kexec_start_address:
70	.long	0x0
71
72	.globl kexec_indirection_page
73kexec_indirection_page:
74	.long	0x0
75
76	.globl kexec_mach_type
77kexec_mach_type:
78	.long	0x0
79
80	/* phy addr of the atags for the new kernel */
81	.globl kexec_boot_atags
82kexec_boot_atags:
83	.long	0x0
84
85ENDPROC(relocate_new_kernel)
86
 
87relocate_new_kernel_end:
88
89	.globl relocate_new_kernel_size
90relocate_new_kernel_size:
91	.long relocate_new_kernel_end - relocate_new_kernel
92
93

 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