| Martin Schwidefsky | 1844c9b | 2010-02-26 22:37:53 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Startup glue code to uncompress the kernel |
| 3 | * |
| 4 | * Copyright IBM Corp. 2010 |
| 5 | * |
| 6 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> |
| 7 | */ |
| 8 | |
| 9 | #include <linux/init.h> |
| Jan Glauber | 144d634 | 2011-07-24 10:48:19 +0200 | [diff] [blame] | 10 | #include <linux/linkage.h> |
| Martin Schwidefsky | 1844c9b | 2010-02-26 22:37:53 +0100 | [diff] [blame] | 11 | #include <asm/asm-offsets.h> |
| 12 | #include <asm/thread_info.h> |
| 13 | #include <asm/page.h> |
| 14 | #include "sizes.h" |
| 15 | |
| 16 | __HEAD |
| Jan Glauber | 144d634 | 2011-07-24 10:48:19 +0200 | [diff] [blame] | 17 | ENTRY(startup_continue) |
| Martin Schwidefsky | 1844c9b | 2010-02-26 22:37:53 +0100 | [diff] [blame] | 18 | basr %r13,0 # get base |
| 19 | .LPG1: |
| 20 | # setup stack |
| 21 | lg %r15,.Lstack-.LPG1(%r13) |
| 22 | aghi %r15,-160 |
| 23 | brasl %r14,decompress_kernel |
| Sascha Silbe | bf47dc5 | 2016-07-04 17:16:47 +0200 | [diff] [blame] | 24 | # Set up registers for memory mover. We move the decompressed image to |
| 25 | # 0x11000, starting at offset 0x11000 in the decompressed image so |
| 26 | # that code living at 0x11000 in the image will end up at 0x11000 in |
| 27 | # memory. |
| Martin Schwidefsky | 1844c9b | 2010-02-26 22:37:53 +0100 | [diff] [blame] | 28 | lgr %r4,%r2 |
| 29 | lg %r2,.Loffset-.LPG1(%r13) |
| 30 | la %r4,0(%r2,%r4) |
| 31 | lg %r3,.Lmvsize-.LPG1(%r13) |
| 32 | lgr %r5,%r3 |
| Sascha Silbe | bf47dc5 | 2016-07-04 17:16:47 +0200 | [diff] [blame] | 33 | # Move the memory mover someplace safe so it doesn't overwrite itself. |
| Martin Schwidefsky | 1844c9b | 2010-02-26 22:37:53 +0100 | [diff] [blame] | 34 | la %r1,0x200 |
| 35 | mvc 0(mover_end-mover,%r1),mover-.LPG1(%r13) |
| Sascha Silbe | bf47dc5 | 2016-07-04 17:16:47 +0200 | [diff] [blame] | 36 | # When the memory mover is done we pass control to |
| 37 | # arch/s390/kernel/head64.S:startup_continue which lives at 0x11000 in |
| 38 | # the decompressed image. |
| Martin Schwidefsky | 1844c9b | 2010-02-26 22:37:53 +0100 | [diff] [blame] | 39 | lgr %r6,%r2 |
| 40 | br %r1 |
| 41 | mover: |
| 42 | mvcle %r2,%r4,0 |
| 43 | jo mover |
| 44 | br %r6 |
| 45 | mover_end: |
| 46 | |
| 47 | .align 8 |
| 48 | .Lstack: |
| 49 | .quad 0x8000 + (1<<(PAGE_SHIFT+THREAD_ORDER)) |
| 50 | .Loffset: |
| 51 | .quad 0x11000 |
| 52 | .Lmvsize: |
| 53 | .quad SZ__bss_start |