53 lines
1.2 KiB
ArmAsm
Executable file
53 lines
1.2 KiB
ArmAsm
Executable file
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Startup glue code to uncompress the kernel
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*
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* Copyright IBM Corp. 2010
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*
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <asm/asm-offsets.h>
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#include <asm/thread_info.h>
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#include <asm/page.h>
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#include "sizes.h"
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__HEAD
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ENTRY(startup_decompressor)
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basr %r13,0 # get base
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.LPG1:
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# setup stack
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lg %r15,.Lstack-.LPG1(%r13)
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aghi %r15,-160
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brasl %r14,decompress_kernel
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# Set up registers for memory mover. We move the decompressed image to
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# 0x100000, where startup_continue of the decompressed image is supposed
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# to be.
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lgr %r4,%r2
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lg %r2,.Loffset-.LPG1(%r13)
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lg %r3,.Lmvsize-.LPG1(%r13)
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lgr %r5,%r3
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# Move the memory mover someplace safe so it doesn't overwrite itself.
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la %r1,0x200
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mvc 0(mover_end-mover,%r1),mover-.LPG1(%r13)
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# When the memory mover is done we pass control to
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# arch/s390/kernel/head64.S:startup_continue which lives at 0x100000 in
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# the decompressed image.
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lgr %r6,%r2
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br %r1
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mover:
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mvcle %r2,%r4,0
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jo mover
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br %r6
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mover_end:
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.align 8
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.Lstack:
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.quad 0x8000 + (1<<(PAGE_SHIFT+THREAD_SIZE_ORDER))
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.Loffset:
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.quad 0x100000
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.Lmvsize:
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.quad SZ__bss_start
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