From 77fa22450de00d535de2cc8be653983560828000 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Sat, 25 Jun 2005 14:55:30 -0700 Subject: [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/s390/kernel/process.c | 46 ++++++++++++---------------------------------- 1 file changed, 12 insertions(+), 34 deletions(-) (limited to 'arch/s390/kernel/process.c') 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) (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) -- cgit v1.2.3