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authorH. Peter Anvin <hpa@linux.intel.com>2012-12-17 11:26:31 -0800
committerH. Peter Anvin <hpa@linux.intel.com>2012-12-17 11:42:40 -0800
commitbc3eba60682750dd7b45ea616d65c926fc3b8be8 (patch)
tree19df6b9254b6d4d0aa575d06fe018fc12c9727d1 /arch/x86/kernel/irqinit.c
parent11af32b69ef7ee64c7d8848cad71a6f3749d9e37 (diff)
downloadtalos-op-linux-bc3eba60682750dd7b45ea616d65c926fc3b8be8.tar.gz
talos-op-linux-bc3eba60682750dd7b45ea616d65c926fc3b8be8.zip
x86, 386 removal: Remove support for IRQ 13 FPU error reporting
Remove support for FPU error reporting via IRQ 13, as opposed to exception 16 (#MF). One last remnant of i386 gone. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Cc: Alan Cox <alan@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/irqinit.c')
-rw-r--r--arch/x86/kernel/irqinit.c40
1 files changed, 0 insertions, 40 deletions
diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index 6e03b0d69138..7dc4e459c2b3 100644
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -42,39 +42,6 @@
* (these are usually mapped into the 0x30-0xff vector range)
*/
-#ifdef CONFIG_X86_32
-/*
- * Note that on a 486, we don't want to do a SIGFPE on an irq13
- * as the irq is unreliable, and exception 16 works correctly
- * (ie as explained in the intel literature). On a 386, you
- * can't use exception 16 due to bad IBM design, so we have to
- * rely on the less exact irq13.
- *
- * Careful.. Not only is IRQ13 unreliable, but it is also
- * leads to races. IBM designers who came up with it should
- * be shot.
- */
-
-static irqreturn_t math_error_irq(int cpl, void *dev_id)
-{
- outb(0, 0xF0);
- if (ignore_fpu_irq || !boot_cpu_data.hard_math)
- return IRQ_NONE;
- math_error(get_irq_regs(), 0, X86_TRAP_MF);
- return IRQ_HANDLED;
-}
-
-/*
- * New motherboards sometimes make IRQ 13 be a PCI interrupt,
- * so allow interrupt sharing.
- */
-static struct irqaction fpu_irq = {
- .handler = math_error_irq,
- .name = "fpu",
- .flags = IRQF_NO_THREAD,
-};
-#endif
-
/*
* IRQ2 is cascade interrupt to second interrupt controller
*/
@@ -242,13 +209,6 @@ void __init native_init_IRQ(void)
setup_irq(2, &irq2);
#ifdef CONFIG_X86_32
- /*
- * External FPU? Set up irq13 if so, for
- * original braindamaged IBM FERR coupling.
- */
- if (boot_cpu_data.hard_math && !cpu_has_fpu)
- setup_irq(FPU_IRQ, &fpu_irq);
-
irq_ctx_init(smp_processor_id());
#endif
}
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