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[PATCH] s390: improved machine check handling

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Improved machine check handling.  Kernel is now able to receive machine checks
while in kernel mode (system call, interrupt and program check handling).
Also register validation is now performed.

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:
Heiko Carstens
2005-06-25 14:55:30 -07:00
committed by Linus Torvalds
parent f901e5d1e0
commit 77fa22450d
12 changed files with 576 additions and 135 deletions
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46
arch/s390/kernel/process.c
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@ -91,13 +91,12 @@ void do_monitor_call(struct pt_regs *regs, long interruption_code)
(void *)(long) smp_processor_id());
}
extern void s390_handle_mcck(void);
/*
* The idle loop on a S390...
*/
void default_idle(void)
{
psw_t wait_psw;
unsigned long reg;
int cpu, rc;
local_irq_disable();
@ -125,38 +124,17 @@ void default_idle(void)
cpu_die();
#endif
/*
* Wait for external, I/O or machine check interrupt and
* switch off machine check bit after the wait has ended.
*/
wait_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK | PSW_MASK_WAIT |
PSW_MASK_IO | PSW_MASK_EXT;
#ifndef CONFIG_ARCH_S390X
asm volatile (
" basr %0,0\n"
"0: la %0,1f-0b(%0)\n"
" st %0,4(%1)\n"
" oi 4(%1),0x80\n"
" lpsw 0(%1)\n"
"1: la %0,2f-1b(%0)\n"
" st %0,4(%1)\n"
" oi 4(%1),0x80\n"
" ni 1(%1),0xf9\n"
" lpsw 0(%1)\n"
"2:"
: "=&a" (reg) : "a" (&wait_psw) : "memory", "cc" );
#else /* CONFIG_ARCH_S390X */
asm volatile (
" larl %0,0f\n"
" stg %0,8(%1)\n"
" lpswe 0(%1)\n"
"0: larl %0,1f\n"
" stg %0,8(%1)\n"
" ni 1(%1),0xf9\n"
" lpswe 0(%1)\n"
"1:"
: "=&a" (reg) : "a" (&wait_psw) : "memory", "cc" );
#endif /* CONFIG_ARCH_S390X */
local_mcck_disable();
if (test_thread_flag(TIF_MCCK_PENDING)) {
local_mcck_enable();
local_irq_enable();
s390_handle_mcck();
return;
}
/* Wait for external, I/O or machine check interrupt. */
__load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_WAIT |
PSW_MASK_IO | PSW_MASK_EXT);
}
void cpu_idle(void)