1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Startup glue code to uncompress the kernel 4 * 5 * Copyright IBM Corp. 2010 6 * 7 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 8 */ 9 10#include <linux/init.h> 11#include <linux/linkage.h> 12#include <asm/asm-offsets.h> 13#include <asm/thread_info.h> 14#include <asm/page.h> 15#include "sizes.h" 16 17__HEAD 18ENTRY(startup_continue) 19 basr %r13,0 # get base 20.LPG1: 21 # setup stack 22 lg %r15,.Lstack-.LPG1(%r13) 23 aghi %r15,-160 24 brasl %r14,decompress_kernel 25 # Set up registers for memory mover. We move the decompressed image to 26 # 0x11000, starting at offset 0x11000 in the decompressed image so 27 # that code living at 0x11000 in the image will end up at 0x11000 in 28 # memory. 29 lgr %r4,%r2 30 lg %r2,.Loffset-.LPG1(%r13) 31 la %r4,0(%r2,%r4) 32 lg %r3,.Lmvsize-.LPG1(%r13) 33 lgr %r5,%r3 34 # Move the memory mover someplace safe so it doesn't overwrite itself. 35 la %r1,0x200 36 mvc 0(mover_end-mover,%r1),mover-.LPG1(%r13) 37 # When the memory mover is done we pass control to 38 # arch/s390/kernel/head64.S:startup_continue which lives at 0x11000 in 39 # the decompressed image. 40 lgr %r6,%r2 41 br %r1 42mover: 43 mvcle %r2,%r4,0 44 jo mover 45 br %r6 46mover_end: 47 48 .align 8 49.Lstack: 50 .quad 0x8000 + (1<<(PAGE_SHIFT+THREAD_SIZE_ORDER)) 51.Loffset: 52 .quad 0x11000 53.Lmvsize: 54 .quad SZ__bss_start 55