[linux-block.git] / arch / arm / kernel / relocate_kernel.S

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * relocate_kernel.S - put the kernel image in place to boot
 */

#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/kexec.h>

	.align	3	/* not needed for this code, but keeps fncpy() happy */

ENTRY(relocate_new_kernel)

	ldr	r0,kexec_indirection_page
	ldr	r1,kexec_start_address

	/*
	 * If there is no indirection page (we are doing crashdumps)
	 * skip any relocation.
	 */
	cmp	r0, #0
	beq	2f

0:	/* top, read another word for the indirection page */
	ldr	r3, [r0],#4

	/* Is it a destination page. Put destination address to r4 */
	tst	r3,#1,0
	beq	1f
	bic	r4,r3,#1
	b	0b
1:
	/* Is it an indirection page */
	tst	r3,#2,0
	beq	1f
	bic	r0,r3,#2
	b	0b
1:

	/* are we done ? */
	tst	r3,#4,0
	beq	1f
	b	2f

1:
	/* is it source ? */
	tst	r3,#8,0
	beq	0b
	bic r3,r3,#8
	mov r6,#1024
9:
	ldr r5,[r3],#4
	str r5,[r4],#4
	subs r6,r6,#1
	bne 9b
	b 0b

2:
	/* Jump to relocated kernel */
	mov lr,r1
	mov r0,#0
	ldr r1,kexec_mach_type
	ldr r2,kexec_boot_atags
 ARM(	ret lr	)
 THUMB(	bx lr		)

	.align

	.globl kexec_start_address
kexec_start_address:
	.long	0x0

	.globl kexec_indirection_page
kexec_indirection_page:
	.long	0x0

	.globl kexec_mach_type
kexec_mach_type:
	.long	0x0

	/* phy addr of the atags for the new kernel */
	.globl kexec_boot_atags
kexec_boot_atags:
	.long	0x0

ENDPROC(relocate_new_kernel)

relocate_new_kernel_end:

	.globl relocate_new_kernel_size
relocate_new_kernel_size:
	.long relocate_new_kernel_end - relocate_new_kernel
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
c587e4a6 RP	2	/*
	3	* relocate_kernel.S - put the kernel image in place to boot
	4	*/
	5
e2ccba49	6	#include <linux/linkage.h>
6ebbf2ce	7	#include <asm/assembler.h>
c587e4a6 RP	8	#include <asm/kexec.h>
c587e4a6 RP	9
e2ccba49 DM	10	.align 3 /* not needed for this code, but keeps fncpy() happy */
	11
	12	ENTRY(relocate_new_kernel)
c587e4a6 RP	13
	14	ldr r0,kexec_indirection_page
	15	ldr r1,kexec_start_address
	16
8594a0c3 MW	17	/*
	18	* If there is no indirection page (we are doing crashdumps)
	19	* skip any relocation.
	20	*/
	21	cmp r0, #0
	22	beq 2f
c587e4a6 RP	23
	24	0: /* 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
	32	1:
	33	/* Is it an indirection page */
	34	tst r3,#2,0
	35	beq 1f
	36	bic r0,r3,#2
	37	b 0b
	38	1:
	39
	40	/* are we done ? */
	41	tst r3,#4,0
	42	beq 1f
	43	b 2f
	44
	45	1:
	46	/* is it source ? */
	47	tst r3,#8,0
	48	beq 0b
	49	bic r3,r3,#8
	50	mov r6,#1024
	51	9:
	52	ldr r5,[r3],#4
	53	str r5,[r4],#4
	54	subs r6,r6,#1
	55	bne 9b
	56	b 0b
	57
	58	2:
	59	/* Jump to relocated kernel */
	60	mov lr,r1
	61	mov r0,#0
	62	ldr r1,kexec_mach_type
4cd9d6f7	63	ldr r2,kexec_boot_atags
6ebbf2ce	64	ARM( ret lr )
552e0c8d	65	THUMB( bx lr )
c587e4a6	66
bc8b57f0 DM	67	.align
bc8b57f0 DM	68
c587e4a6 RP	69	.globl kexec_start_address
	70	kexec_start_address:
	71	.long 0x0
	72
	73	.globl kexec_indirection_page
	74	kexec_indirection_page:
	75	.long 0x0
	76
	77	.globl kexec_mach_type
	78	kexec_mach_type:
	79	.long 0x0
	80
4cd9d6f7 RP	81	/* phy addr of the atags for the new kernel */
	82	.globl kexec_boot_atags
	83	kexec_boot_atags:
033b8ffe MW	84	.long 0x0
033b8ffe MW	85
e2ccba49 DM	86	ENDPROC(relocate_new_kernel)
e2ccba49 DM	87
c587e4a6 RP	88	relocate_new_kernel_end:
	89
	90	.globl relocate_new_kernel_size
	91	relocate_new_kernel_size:
	92	.long relocate_new_kernel_end - relocate_new_kernel
	93
	94