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

 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/kexec.h>
 9
10	.align	3	/* not needed for this code, but keeps fncpy() happy */
11
12ENTRY(relocate_new_kernel)
13
14	ldr	r0,kexec_indirection_page
15	ldr	r1,kexec_start_address
 
16
17	/*
18	 * If there is no indirection page (we are doing crashdumps)
19	 * skip any relocation.
20	 */
21	cmp	r0, #0
22	beq	2f
23
240:	/* top, read another word for the indirection page */
25	ldr	r3, [r0],#4
26
27	/* Is it a destination page. Put destination address to r4 */
28	tst	r3,#1,0
29	beq	1f
30	bic	r4,r3,#1
31	b	0b
321:
33	/* Is it an indirection page */
34	tst	r3,#2,0
35	beq	1f
36	bic	r0,r3,#2
37	b	0b
381:
39
40	/* are we done ? */
41	tst	r3,#4,0
42	beq	1f
43	b	2f
44
451:
46	/* is it source ? */
47	tst	r3,#8,0
48	beq	0b
49	bic r3,r3,#8
50	mov r6,#1024
519:
52	ldr r5,[r3],#4
53	str r5,[r4],#4
54	subs r6,r6,#1
55	bne 9b
56	b 0b
57
582:
59	/* Jump to relocated kernel */
60	mov lr,r1
61	mov r0,#0
62	ldr r1,kexec_mach_type
63	ldr r2,kexec_boot_atags
64 ARM(	ret lr	)
65 THUMB(	bx lr		)
66
67	.align
68
69	.globl kexec_start_address
70kexec_start_address:
71	.long	0x0
72
73	.globl kexec_indirection_page
74kexec_indirection_page:
75	.long	0x0
76
77	.globl kexec_mach_type
78kexec_mach_type:
79	.long	0x0
80
81	/* phy addr of the atags for the new kernel */
82	.globl kexec_boot_atags
83kexec_boot_atags:
84	.long	0x0
85
86ENDPROC(relocate_new_kernel)
87
 
88relocate_new_kernel_end:
89
90	.globl relocate_new_kernel_size
91relocate_new_kernel_size:
92	.long relocate_new_kernel_end - relocate_new_kernel
93
94