For this purpose init_ISA_irqs is called indirectly
by x86_quirk_pre_intr_init.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
---
 arch/x86/kernel/irqinit_32.c |    4 +++-
 arch/x86/kernel/irqinit_64.c |   22 +++++++++++++++++++++-
 arch/x86/kernel/setup.c      |    8 ++++++++
 3 files changed, 32 insertions(+), 2 deletions(-)

Index: linux-2.6.git/arch/x86/kernel/irqinit_32.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/irqinit_32.c
+++ linux-2.6.git/arch/x86/kernel/irqinit_32.c
@@ -215,7 +215,7 @@ void __init native_init_IRQ(void)
 	 */
 	for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
 		int vector = FIRST_EXTERNAL_VECTOR + i;
-		/* SYSCALL_VECTOR was reserved in trap_init. */
+		/* X86-32: SYSCALL_VECTOR was reserved in trap_init. */
 		if (!test_bit(vector, used_vectors))
 			set_intr_gate(vector, interrupt[i]);
 	}
@@ -229,6 +229,7 @@ void __init native_init_IRQ(void)
 	 */
 	x86_quirk_intr_init();
 
+#ifdef CONFIG_X86_32
 	/*
 	 * External FPU? Set up irq13 if so, for
 	 * original braindamaged IBM FERR coupling.
@@ -237,4 +238,5 @@ void __init native_init_IRQ(void)
 		setup_irq(FPU_IRQ, &fpu_irq);
 
 	irq_ctx_init(smp_processor_id());
+#endif
 }
Index: linux-2.6.git/arch/x86/kernel/irqinit_64.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/irqinit_64.c
+++ linux-2.6.git/arch/x86/kernel/irqinit_64.c
@@ -21,6 +21,7 @@
 #include <asm/pgtable.h>
 #include <asm/desc.h>
 #include <asm/apic.h>
+#include <asm/setup.h>
 #include <asm/i8259.h>
 
 /*
@@ -174,7 +175,8 @@ void __init native_init_IRQ(void)
 {
 	int i;
 
-	init_ISA_irqs();
+	/* Execute any quirks before the call gates are initialised: */
+	x86_quirk_pre_intr_init();
 
 	apic_intr_init();
 
@@ -185,10 +187,28 @@ void __init native_init_IRQ(void)
 	 */
 	for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
 		int vector = FIRST_EXTERNAL_VECTOR + i;
+		/* X86-32: SYSCALL_VECTOR was reserved in trap_init. */
 		if (!test_bit(vector, used_vectors))
 			set_intr_gate(vector, interrupt[i]);
 	}
 
 	if (!acpi_ioapic)
 		setup_irq(2, &irq2);
+
+	/*
+	 * Call quirks after call gates are initialised (usually add in
+	 * the architecture specific gates):
+	 */
+	x86_quirk_intr_init();
+
+#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
 }
Index: linux-2.6.git/arch/x86/kernel/setup.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/setup.c
+++ linux-2.6.git/arch/x86/kernel/setup.c
@@ -1087,3 +1087,11 @@ void __init x86_quirk_time_init(void)
 	setup_irq(0, &irq0);
 }
 #endif /* CONFIG_X86_32 */
+
+#ifdef CONFIG_X86_64
+void x86_quirk_pre_intr_init(void)
+{
+	init_ISA_irqs();
+}
+void x86_quirk_intr_init(void) { }
+#endif

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