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