Define the i386 crash_stop() interrupt handler and associated routines.
Yes, I know that CRASH_STOP_VECTOR conflicts with the lkcd vector.
This is deliberate, one aim of the crash_stop() API is to remove all
the interrupt code from the various kernel debug patches.
Note 1: I have patched visw but I cannot test it, no hardware.
Note 2: This patch does not cover i386 voyager. I do not understand
the voyager interrupt mechanism well enough to define its
interrupt handlers (hint, hint).
---
arch/i386/kernel/smp.c | 21 +++++++++++++++++++++
arch/i386/kernel/smpboot.c | 4 ++++
include/asm-i386/hw_irq.h | 1 +
include/asm-i386/mach-default/entry_arch.h | 3 +++
include/asm-i386/mach-default/irq_vectors.h | 1 +
include/asm-i386/mach-visws/entry_arch.h | 3 +++
6 files changed, 33 insertions(+)
Index: linux/arch/i386/kernel/smp.c
===================================================================
--- linux.orig/arch/i386/kernel/smp.c
+++ linux/arch/i386/kernel/smp.c
@@ -20,6 +20,7 @@
#include <linux/interrupt.h>
#include <linux/cpu.h>
#include <linux/module.h>
+#include <linux/crash_stop.h>
#include <asm/mtrr.h>
#include <asm/tlbflush.h>
@@ -727,3 +728,23 @@ int safe_smp_processor_id(void)
return cpuid >= 0 ? cpuid : 0;
}
+
+#ifdef CONFIG_CRASH_STOP_SUPPORTED
+void
+cs_arch_send_ipi(int cpu)
+{
+ send_IPI_mask(cpumask_of_cpu(cpu), CRASH_STOP_VECTOR);
+}
+
+void
+cs_arch_send_nmi(int cpu)
+{
+ send_IPI_mask(cpumask_of_cpu(cpu), NMI_VECTOR);
+}
+
+fastcall void smp_crash_stop_interrupt(struct pt_regs *regs)
+{
+ ack_APIC_irq();
+ cs_common_ipi(regs);
+}
+#endif /* CONFIG_CRASH_STOP_SUPPORTED */
Index: linux/arch/i386/kernel/smpboot.c
===================================================================
--- linux.orig/arch/i386/kernel/smpboot.c
+++ linux/arch/i386/kernel/smpboot.c
@@ -1497,6 +1497,10 @@ void __init smp_intr_init(void)
/* IPI for generic function call */
set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
+
+#ifdef CONFIG_CRASH_STOP_SUPPORTED
+ set_intr_gate(CRASH_STOP_VECTOR, crash_stop_interrupt);
+#endif /* CONFIG_CRASH_STOP_SUPPORTED */
}
/*
Index: linux/include/asm-i386/hw_irq.h
===================================================================
--- linux.orig/include/asm-i386/hw_irq.h
+++ linux/include/asm-i386/hw_irq.h
@@ -35,6 +35,7 @@ extern void (*interrupt[NR_IRQS])(void);
fastcall void reschedule_interrupt(void);
fastcall void invalidate_interrupt(void);
fastcall void call_function_interrupt(void);
+fastcall void crash_stop_interrupt(void);
#endif
#ifdef CONFIG_X86_LOCAL_APIC
Index: linux/include/asm-i386/mach-default/entry_arch.h
===================================================================
--- linux.orig/include/asm-i386/mach-default/entry_arch.h
+++ linux/include/asm-i386/mach-default/entry_arch.h
@@ -13,6 +13,9 @@
BUILD_INTERRUPT(reschedule_interrupt,RESCHEDULE_VECTOR)
BUILD_INTERRUPT(invalidate_interrupt,INVALIDATE_TLB_VECTOR)
BUILD_INTERRUPT(call_function_interrupt,CALL_FUNCTION_VECTOR)
+#ifdef CONFIG_CRASH_STOP_SUPPORTED
+BUILD_INTERRUPT(crash_stop_interrupt,CRASH_STOP_VECTOR)
+#endif /* CONFIG_CRASH_STOP_SUPPORTED */
#endif
/*
Index: linux/include/asm-i386/mach-default/irq_vectors.h
===================================================================
--- linux.orig/include/asm-i386/mach-default/irq_vectors.h
+++ linux/include/asm-i386/mach-default/irq_vectors.h
@@ -48,6 +48,7 @@
#define INVALIDATE_TLB_VECTOR 0xfd
#define RESCHEDULE_VECTOR 0xfc
#define CALL_FUNCTION_VECTOR 0xfb
+#define CRASH_STOP_VECTOR 0xfa
#define THERMAL_APIC_VECTOR 0xf0
/*
Index: linux/include/asm-i386/mach-visws/entry_arch.h
===================================================================
--- linux.orig/include/asm-i386/mach-visws/entry_arch.h
+++ linux/include/asm-i386/mach-visws/entry_arch.h
@@ -7,6 +7,9 @@
BUILD_INTERRUPT(reschedule_interrupt,RESCHEDULE_VECTOR)
BUILD_INTERRUPT(invalidate_interrupt,INVALIDATE_TLB_VECTOR)
BUILD_INTERRUPT(call_function_interrupt,CALL_FUNCTION_VECTOR)
+#ifdef CONFIG_CRASH_STOP_SUPPORTED
+BUILD_INTERRUPT(crash_stop_interrupt,CRASH_STOP_VECTOR)
+#endif /* CONFIG_CRASH_STOP_SUPPORTED */
#endif
/*
-
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