79 lines
1.3 KiB
ArmAsm
79 lines
1.3 KiB
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* relocate_kernel.S - put the kernel image in place to boot
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/asm-offsets.h>
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#include <asm/kexec.h>
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.align 3 /* not needed for this code, but keeps fncpy() happy */
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ENTRY(relocate_new_kernel)
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adr r7, relocate_new_kernel_end
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ldr r0, [r7, #KEXEC_INDIR_PAGE]
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ldr r1, [r7, #KEXEC_START_ADDR]
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/*
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* If there is no indirection page (we are doing crashdumps)
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* skip any relocation.
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*/
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cmp r0, #0
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beq 2f
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0: /* top, read another word for the indirection page */
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ldr r3, [r0],#4
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/* Is it a destination page. Put destination address to r4 */
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tst r3,#1
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beq 1f
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bic r4,r3,#1
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b 0b
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1:
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/* Is it an indirection page */
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tst r3,#2
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beq 1f
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bic r0,r3,#2
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b 0b
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1:
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/* are we done ? */
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tst r3,#4
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beq 1f
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b 2f
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1:
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/* is it source ? */
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tst r3,#8
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beq 0b
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bic r3,r3,#8
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mov r6,#1024
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9:
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ldr r5,[r3],#4
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str r5,[r4],#4
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subs r6,r6,#1
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bne 9b
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b 0b
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2:
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/* Jump to relocated kernel */
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mov lr, r1
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mov r0, #0
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ldr r1, [r7, #KEXEC_MACH_TYPE]
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ldr r2, [r7, #KEXEC_R2]
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ARM( ret lr )
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THUMB( bx lr )
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ENDPROC(relocate_new_kernel)
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.align 3
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relocate_new_kernel_end:
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.globl relocate_new_kernel_size
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relocate_new_kernel_size:
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.long relocate_new_kernel_end - relocate_new_kernel
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