| /* 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_continue) | |
| 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 | |
| # 0x11000, starting at offset 0x11000 in the decompressed image so | |
| # that code living at 0x11000 in the image will end up at 0x11000 in | |
| # memory. | |
| lgr %r4,%r2 | |
| lg %r2,.Loffset-.LPG1(%r13) | |
| la %r4,0(%r2,%r4) | |
| 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 0x11000 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 0x11000 | |
| .Lmvsize: | |
| .quad SZ__bss_start |