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| author | Vasily Gorbik <gor@linux.ibm.com> | 2018-07-19 13:11:28 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-10-09 11:21:02 +0200 |
| commit | 8f75582a2fb6e2c5afc5252b6d6932f61a79c939 (patch) | |
| tree | ce09a3124eabde2b2e88f03d030f2a54ecbe450a /arch/s390/boot/compressed/head.S | |
| parent | s390: unify stack size definitions (diff) | |
| download | linux-8f75582a2fb6e2c5afc5252b6d6932f61a79c939.tar.gz linux-8f75582a2fb6e2c5afc5252b6d6932f61a79c939.zip | |
s390: remove decompressor's head.S
Decompressor's head.S provided "data mover" sole purpose of which has
been to safely move uncompressed kernel at 0x100000 and jump to it.
With current bzImage layout entire decompressor's code guaranteed to be
in a safe location under 0x100000, and hence could not be overwritten
during kernel move. For that reason head.S could be replaced with simple
memmove function. To do so introduce early boot code phase which is
executed from arch/s390/boot/head.S after "verify_facilities" and takes
care of optional kernel image decompression and transition to it.
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/boot/compressed/head.S')
| -rw-r--r-- | arch/s390/boot/compressed/head.S | 52 |
1 files changed, 0 insertions, 52 deletions
diff --git a/arch/s390/boot/compressed/head.S b/arch/s390/boot/compressed/head.S deleted file mode 100644 index 4041fcfd8980..000000000000 --- a/arch/s390/boot/compressed/head.S +++ /dev/null @@ -1,52 +0,0 @@ -/* 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 <asm/ptrace.h> -#include "sizes.h" - -__HEAD -ENTRY(startup_decompressor) - basr %r13,0 # get base -.LPG1: - # setup stack - lg %r15,.Lstack-.LPG1(%r13) - 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 + THREAD_SIZE - STACK_FRAME_OVERHEAD -.Loffset: - .quad 0x100000 -.Lmvsize: - .quad SZ__bss_start |