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x86, 386 removal: Remove support for IRQ 13 FPU error reporting

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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>
This commit is contained in:
H. Peter Anvin 2012-12-17 11:26:31 -08:00
parent 11af32b69e
commit bc3eba6068
3 changed files with 1 additions and 52 deletions
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7
arch/x86/kernel/cpu/proc.c
View file

@ -26,11 +26,6 @@ static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
#ifdef CONFIG_X86_32
static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
{
/*
* We use exception 16 if we have hardware math and we've either seen
* it or the CPU claims it is internal
*/
int fpu_exception = c->hard_math && (ignore_fpu_irq || cpu_has_fpu);
seq_printf(m,
"fdiv_bug\t: %s\n"
"hlt_bug\t\t: %s\n"
@ -45,7 +40,7 @@ static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
c->f00f_bug ? "yes" : "no",
c->coma_bug ? "yes" : "no",
c->hard_math ? "yes" : "no",
fpu_exception ? "yes" : "no",
c->hard_math ? "yes" : "no",
c->cpuid_level,
c->wp_works_ok ? "yes" : "no");
}

40
arch/x86/kernel/irqinit.c
View file

@ -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
}

6
arch/x86/kernel/traps.c
View file

@ -69,9 +69,6 @@
asmlinkage int system_call(void);
/* Do we ignore FPU interrupts ? */
char ignore_fpu_irq;
/*
* The IDT has to be page-aligned to simplify the Pentium
* F0 0F bug workaround.
@ -564,9 +561,6 @@ void math_error(struct pt_regs *regs, int error_code, int trapnr)
dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code)
{
#ifdef CONFIG_X86_32
ignore_fpu_irq = 1;
#endif
exception_enter(regs);
math_error(regs, error_code, X86_TRAP_MF);
exception_exit(regs);