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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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52
include/asm-s390/processor.h
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@@ -206,6 +206,18 @@ unsigned long get_wchan(struct task_struct *p);
asm volatile ("ex 0,%0" : : "i" (__LC_DIAG44_OPCODE) : "memory")
#endif /* __s390x__ */
/*
* Set PSW to specified value.
*/
static inline void __load_psw(psw_t psw)
{
#ifndef __s390x__
asm volatile ("lpsw 0(%0)" : : "a" (&psw), "m" (psw) : "cc" );
#else
asm volatile ("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc" );
#endif
}
/*
* Set PSW mask to specified value, while leaving the
* PSW addr pointing to the next instruction.
@@ -214,8 +226,8 @@ unsigned long get_wchan(struct task_struct *p);
static inline void __load_psw_mask (unsigned long mask)
{
unsigned long addr;
psw_t psw;
psw.mask = mask;
#ifndef __s390x__
@@ -241,30 +253,8 @@ static inline void __load_psw_mask (unsigned long mask)
*/
static inline void enabled_wait(void)
{
unsigned long reg;
psw_t wait_psw;
wait_psw.mask = PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY;
#ifndef __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:"
: "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw)
: "memory", "cc" );
#else /* __s390x__ */
asm volatile (
" larl %0,0f\n"
" stg %0,8(%1)\n"
" lpswe 0(%1)\n"
"0:"
: "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw)
: "memory", "cc" );
#endif /* __s390x__ */
__load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
}
/*
@@ -273,13 +263,11 @@ static inline void enabled_wait(void)
static inline void disabled_wait(unsigned long code)
{
char psw_buffer[2*sizeof(psw_t)];
unsigned long ctl_buf;
psw_t *dw_psw = (psw_t *)(((unsigned long) &psw_buffer+sizeof(psw_t)-1)
& -sizeof(psw_t));
psw_t dw_psw;
dw_psw->mask = PSW_BASE_BITS | PSW_MASK_WAIT;
dw_psw->addr = code;
dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
dw_psw.addr = code;
/*
* Store status and then load disabled wait psw,
* the processor is dead afterwards
@@ -301,7 +289,7 @@ static inline void disabled_wait(unsigned long code)
" oi 0x1c0,0x10\n" /* fake protection bit */
" lpsw 0(%1)"
: "=m" (ctl_buf)
: "a" (dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc" );
: "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc" );
#else /* __s390x__ */
asm volatile (" stctg 0,0,0(%2)\n"
" ni 4(%2),0xef\n" /* switch off protection */
@@ -333,7 +321,7 @@ static inline void disabled_wait(unsigned long code)
" oi 0x384(1),0x10\n" /* fake protection bit */
" lpswe 0(%1)"
: "=m" (ctl_buf)
: "a" (dw_psw), "a" (&ctl_buf),
: "a" (&dw_psw), "a" (&ctl_buf),
"m" (dw_psw) : "cc", "0", "1");
#endif /* __s390x__ */
}