lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[S390] add mini sclp driver

Browse Source 
This adds a mini sclp device driver for very early use. The primary
and probably only use will be to emit a message to the console if the
cpu doesn't provide the minimum required capabilities to run the kernel.
After printing the message a disabled wait will be loaded and the
machine stops operating.
Printing the message is also part of this patch.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2009-06-12 10:26:24 +02:00
committed by Martin Schwidefsky
parent 8c4caa4fbf
commit d90cbd469c
3 changed files with 342 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
arch/s390/kernel/head.S
View File

@ -1,7 +1,5 @@
/*
* arch/s390/kernel/head.S
*
* Copyright (C) IBM Corp. 1999,2006
* Copyright IBM Corp. 1999,2009
*
* Author(s): Hartmut Penner <hp@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
@ -494,7 +492,19 @@ startup:basr %r13,0 # get base
n %r0,2f+12-.LPG0(%r13)
cl %r0,2f+12-.LPG0(%r13)
je 3f
1: lpsw 2f-.LPG0(13) # machine type not good enough, crash
1: l %r15,.Lstack-.LPG0(%r13)
ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE
ahi %r15,-96
la %r2,.Lals_string-.LPG0(%r13)
l %r3,.Lsclp_print-.LPG0(%r13)
basr %r14,%r3
lpsw 2f-.LPG0(%r13) # machine type not good enough, crash
.Lals_string:
.asciz "The Linux kernel requires more recent processor hardware"
.Lsclp_print:
.long _sclp_print_early
.Lstack:
.long init_thread_union
.align 16
2: .long 0x000a0000,0x8badcccc
#if defined(CONFIG_64BIT)