| /* 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 |
