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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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