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authorHeiko Carstens <heiko.carstens@de.ibm.com>2005-06-25 17:55:30 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 19:24:37 -0400
commit77fa22450de00d535de2cc8be653983560828000 (patch)
tree61644edb2263c3d0db3ea9e9518c6f76a60039e0 /arch/s390/kernel/process.c
parentf901e5d1e06b3326c100c5d0df43656311befb81 (diff)
[PATCH] s390: improved machine check handling
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>
Diffstat (limited to 'arch/s390/kernel/process.c')
-rw-r--r--arch/s390/kernel/process.c46
1 files changed, 12 insertions, 34 deletions
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 7aea25d6e30..9f3dff6c0b7 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -91,13 +91,12 @@ void do_monitor_call(struct pt_regs *regs, long interruption_code)
91 (void *)(long) smp_processor_id()); 91 (void *)(long) smp_processor_id());
92} 92}
93 93
94extern void s390_handle_mcck(void);
94/* 95/*
95 * The idle loop on a S390... 96 * The idle loop on a S390...
96 */ 97 */
97void default_idle(void) 98void default_idle(void)
98{ 99{
99 psw_t wait_psw;
100 unsigned long reg;
101 int cpu, rc; 100 int cpu, rc;
102 101
103 local_irq_disable(); 102 local_irq_disable();
@@ -125,38 +124,17 @@ void default_idle(void)
125 cpu_die(); 124 cpu_die();
126#endif 125#endif
127 126
128 /* 127 local_mcck_disable();
129 * Wait for external, I/O or machine check interrupt and 128 if (test_thread_flag(TIF_MCCK_PENDING)) {
130 * switch off machine check bit after the wait has ended. 129 local_mcck_enable();
131 */ 130 local_irq_enable();
132 wait_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK | PSW_MASK_WAIT | 131 s390_handle_mcck();
133 PSW_MASK_IO | PSW_MASK_EXT; 132 return;
134#ifndef CONFIG_ARCH_S390X 133 }
135 asm volatile ( 134
136 " basr %0,0\n" 135 /* Wait for external, I/O or machine check interrupt. */
137 "0: la %0,1f-0b(%0)\n" 136 __load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_WAIT |
138 " st %0,4(%1)\n" 137 PSW_MASK_IO | PSW_MASK_EXT);
139 " oi 4(%1),0x80\n"
140 " lpsw 0(%1)\n"
141 "1: la %0,2f-1b(%0)\n"
142 " st %0,4(%1)\n"
143 " oi 4(%1),0x80\n"
144 " ni 1(%1),0xf9\n"
145 " lpsw 0(%1)\n"
146 "2:"
147 : "=&a" (reg) : "a" (&wait_psw) : "memory", "cc" );
148#else /* CONFIG_ARCH_S390X */
149 asm volatile (
150 " larl %0,0f\n"
151 " stg %0,8(%1)\n"
152 " lpswe 0(%1)\n"
153 "0: larl %0,1f\n"
154 " stg %0,8(%1)\n"
155 " ni 1(%1),0xf9\n"
156 " lpswe 0(%1)\n"
157 "1:"
158 : "=&a" (reg) : "a" (&wait_psw) : "memory", "cc" );
159#endif /* CONFIG_ARCH_S390X */
160} 138}
161 139
162void cpu_idle(void) 140void cpu_idle(void)