95 lines
1.5 KiB
ArmAsm
95 lines
1.5 KiB
ArmAsm
/* 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/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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ldr r0,kexec_indirection_page
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ldr r1,kexec_start_address
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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,#1,0
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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,#2,0
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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,#4,0
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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,#8,0
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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,kexec_mach_type
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ldr r2,kexec_boot_atags
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ARM( ret lr )
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THUMB( bx lr )
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.align
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.globl kexec_start_address
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kexec_start_address:
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.long 0x0
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.globl kexec_indirection_page
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kexec_indirection_page:
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.long 0x0
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.globl kexec_mach_type
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kexec_mach_type:
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.long 0x0
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/* phy addr of the atags for the new kernel */
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.globl kexec_boot_atags
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kexec_boot_atags:
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.long 0x0
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ENDPROC(relocate_new_kernel)
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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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