The user interrupt vector needs to be installed before the interrupts
are unmasked otherwise the timer tick isn't handled and boot up gets
stuck in calibrate_delay().

Assisted-by: Claude:claude-fable-5 # Wrote Apollo DN3000 emulator using QEMU
Signed-off-by: Daniel Palmer <daniel@0x0f.com>
---

Backstory: I have Claude creating a version of QEMU that can emulate
every supported m68k machine. Its still working on getting Domain/OS
booting but it found that Linux locked up on boot and I used gdb to
find the cause.

 arch/m68k/apollo/dn_ints.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/m68k/apollo/dn_ints.c b/arch/m68k/apollo/dn_ints.c
index ba96a92f8f18..89bfb5aaad9d 100644
--- a/arch/m68k/apollo/dn_ints.c
+++ b/arch/m68k/apollo/dn_ints.c
@@ -2,6 +2,7 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 
+#include <asm/irq.h>
 #include <asm/traps.h>
 #include <asm/apollohw.h>
 
@@ -11,10 +12,13 @@ static unsigned int apollo_irq_startup(struct irq_data *data)
 {
 	unsigned int irq = data->irq;
 
+	m68k_irq_startup(data);
+
 	if (irq < 8)
 		*(volatile unsigned char *)(pica+1) &= ~(1 << irq);
 	else
 		*(volatile unsigned char *)(picb+1) &= ~(1 << (irq - 8));
+
 	return 0;
 }
 
@@ -26,6 +30,8 @@ static void apollo_irq_shutdown(struct irq_data *data)
 		*(volatile unsigned char *)(pica+1) |= (1 << irq);
 	else
 		*(volatile unsigned char *)(picb+1) |= (1 << (irq - 8));
+
+	m68k_irq_shutdown(data);
 }
 
 static void apollo_irq_eoi(struct irq_data *data)
-- 
2.53.0