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| /* 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/asm-offsets.h>
| #include <asm/kexec.h>
|
| .align 3 /* not needed for this code, but keeps fncpy() happy */
|
| ENTRY(relocate_new_kernel)
|
| adr r7, relocate_new_kernel_end
| ldr r0, [r7, #KEXEC_INDIR_PAGE]
| ldr r1, [r7, #KEXEC_START_ADDR]
|
| /*
| * 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
| beq 1f
| bic r4,r3,#1
| b 0b
| 1:
| /* Is it an indirection page */
| tst r3,#2
| beq 1f
| bic r0,r3,#2
| b 0b
| 1:
|
| /* are we done ? */
| tst r3,#4
| beq 1f
| b 2f
|
| 1:
| /* is it source ? */
| tst r3,#8
| 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, [r7, #KEXEC_MACH_TYPE]
| ldr r2, [r7, #KEXEC_R2]
| ARM( ret lr )
| THUMB( bx lr )
|
| ENDPROC(relocate_new_kernel)
|
| .align 3
| relocate_new_kernel_end:
|
| .globl relocate_new_kernel_size
| relocate_new_kernel_size:
| .long relocate_new_kernel_end - relocate_new_kernel
|
|
