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[PATCH] s390: diag 0x308 reipl 

Add code to support the re-IPL method using diagnose 0x308.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Volker Sameske 2005-09-16 19:27:35 -07:00 committed by Linus Torvalds
parent b7ae9dd80a
commit c782268be8
4 changed files with 46 additions and 1 deletions
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2
arch/s390/kernel/Makefile
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@ -6,7 +6,7 @@ EXTRA_AFLAGS := -traditional
obj-y := bitmap.o traps.o time.o process.o \
setup.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o \
semaphore.o s390_ext.o debug.o profile.o irq.o
semaphore.o s390_ext.o debug.o profile.o irq.o reipl_diag.o
extra-$(CONFIG_ARCH_S390_31) += head.o
extra-$(CONFIG_ARCH_S390X) += head64.o

39
arch/s390/kernel/reipl_diag.c Normal file
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@ -0,0 +1,39 @@
/*
* This file contains the implementation of the
* Linux re-IPL support
*
* (C) Copyright IBM Corp. 2005
*
* Author(s): Volker Sameske (sameske@de.ibm.com)
*
*/
#include <linux/kernel.h>
static unsigned int reipl_diag_rc1;
static unsigned int reipl_diag_rc2;
/*
* re-IPL the system using the last used IPL parameters
*/
void reipl_diag(void)
{
asm volatile (
" la %%r4,0\n"
" la %%r5,0\n"
" diag %%r4,%2,0x308\n"
"0:\n"
" st %%r4,%0\n"
" st %%r5,%1\n"
".section __ex_table,\"a\"\n"
#ifdef __s390x__
" .align 8\n"
" .quad 0b, 0b\n"
#else
" .align 4\n"
" .long 0b, 0b\n"
#endif
".previous\n"
: "=m" (reipl_diag_rc1), "=m" (reipl_diag_rc2)
: "d" (3) : "cc", "4", "5" );
}

3
arch/s390/kernel/setup.c
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@ -261,8 +261,11 @@ void (*_machine_power_off)(void) = machine_power_off_smp;
* Reboot, halt and power_off routines for non SMP.
*/
extern void reipl(unsigned long devno);
extern void reipl_diag(void);
static void do_machine_restart_nonsmp(char * __unused)
{
reipl_diag();
if (MACHINE_IS_VM)
cpcmd ("IPL", NULL, 0);
else

3
arch/s390/kernel/smp.c
View File

@ -65,6 +65,7 @@ extern char vmhalt_cmd[];
extern char vmpoff_cmd[];
extern void reipl(unsigned long devno);
extern void reipl_diag(void);
static void smp_ext_bitcall(int, ec_bit_sig);
static void smp_ext_bitcall_others(ec_bit_sig);
@ -283,6 +284,8 @@ static void do_machine_restart(void * __unused)
* interrupted by an external interrupt and s390irq
* locks are always held disabled).
*/
reipl_diag();
if (MACHINE_IS_VM)
cpcmd ("IPL", NULL, 0, NULL);
else