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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2010-02-26 22:37:53 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-02-26 22:37:33 +0100 |
| commit | 1844c9bc0b2fed3023551c1affe033ab38e90b9a (patch) | |
| tree | b9aca066ec58a0b211a4931032b74093fdb6ff49 /arch/s390/boot/compressed/head31.S | |
| parent | 73bfa5f2f71efcdcaad8d18cbed96b9d7ed86948 (diff) | |
| download | lwn-1844c9bc0b2fed3023551c1affe033ab38e90b9a.tar.gz lwn-1844c9bc0b2fed3023551c1affe033ab38e90b9a.zip | |
[S390] add support for compressed kernels
Add the "bzImage" compile target and the necessary code to generate
compressed kernel images. The old style uncompressed "image" target
is preserved, a simple make will build them both.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/boot/compressed/head31.S')
| -rw-r--r-- | arch/s390/boot/compressed/head31.S | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/s390/boot/compressed/head31.S b/arch/s390/boot/compressed/head31.S new file mode 100644 index 000000000000..2a5523a32bcc --- /dev/null +++ b/arch/s390/boot/compressed/head31.S @@ -0,0 +1,51 @@ +/* + * Startup glue code to uncompress the kernel + * + * Copyright IBM Corp. 2010 + * + * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> + */ + +#include <linux/init.h> +#include <asm/asm-offsets.h> +#include <asm/thread_info.h> +#include <asm/page.h> +#include "sizes.h" + +__HEAD + .globl startup_continue +startup_continue: + basr %r13,0 # get base +.LPG1: + # setup stack + l %r15,.Lstack-.LPG1(%r13) + ahi %r15,-96 + l %r1,.Ldecompress-.LPG1(%r13) + basr %r14,%r1 + # setup registers for memory mover & branch to target + lr %r4,%r2 + l %r2,.Loffset-.LPG1(%r13) + la %r4,0(%r2,%r4) + l %r3,.Lmvsize-.LPG1(%r13) + lr %r5,%r3 + # move the memory mover someplace safe + la %r1,0x200 + mvc 0(mover_end-mover,%r1),mover-.LPG1(%r13) + # decompress image is started at 0x11000 + lr %r6,%r2 + br %r1 +mover: + mvcle %r2,%r4,0 + jo mover + br %r6 +mover_end: + + .align 8 +.Lstack: + .long 0x8000 + (1<<(PAGE_SHIFT+THREAD_ORDER)) +.Ldecompress: + .long decompress_kernel +.Loffset: + .long 0x11000 +.Lmvsize: + .long SZ__bss_start |