[MIPS] Rewrite all the assembler interrupt handlers to C.

Saves like 1,600 lines of code, is way easier to debug, compilers
frequently do a better job than the cut and paste type of handlers many
boards had.  And finally having all the stuff done in a single place
also means alot of bug potencial for the MT ASE is gone.

The only surviving handler in assembler is the DECstation one; I hope
Maciej will rewrite it.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 15 insertions, 38 deletions

diff --git a/arch/mips/galileo-boards/ev96100/Makefile b/arch/mips/galileo-boards/ev96100/Makefile
index 58c02f9db69d..cd868ec78cbc 100644
--- a/arch/mips/galileo-boards/ev96100/Makefile
+++ b/arch/mips/galileo-boards/ev96100/Makefile
@@ -6,4 +6,4 @@
 # Makefile for the Galileo EV96100 board.
 #
 
-obj-y		+= init.o irq.o puts.o reset.o time.o int-handler.o setup.o
+obj-y		+= init.o irq.o puts.o reset.o time.o setup.o
diff --git a/arch/mips/galileo-boards/ev96100/int-handler.S b/arch/mips/galileo-boards/ev96100/int-handler.S
deleted file mode 100644
index 0edf1fec2905..000000000000
--- a/arch/mips/galileo-boards/ev96100/int-handler.S
+++ /dev/null
@@ -1,34 +0,0 @@
-#include <asm/asm.h>
-#include <asm/mipsregs.h>
-#include <asm/regdef.h>
-#include <asm/stackframe.h>
-
-	.set	noat
-	.align	5
-
-NESTED(ev96100IRQ, PT_SIZE, sp)
-	SAVE_ALL
-	CLI				# Important: mark KERNEL mode !
-
-	mfc0	t0, CP0_CAUSE		# get pending interrupts
-	mfc0	t1, CP0_STATUS		# get enabled interrupts
-	and	t0, t1			# isolate allowed ones
-
-	# FIX ME add R7000 extensions
-	andi	t0,0xff00		# isolate pending bits
-	andi	a0, t0, CAUSEF_IP7
-	beq	a0, zero, 1f
-	move	a0, sp
-	jal	mips_timer_interrupt
-	j	ret_from_irq
-
-1:	beqz	t0, 3f			# spurious interrupt
-
-	move	a0, t0
-	move	a1, sp
-	jal	ev96100_cpu_irq
-	j	ret_from_irq
-
-3:	jal	spurious_interrupt
-	j	ret_from_irq
-	END(ev96100IRQ)
diff --git a/arch/mips/galileo-boards/ev96100/irq.c b/arch/mips/galileo-boards/ev96100/irq.c
index 383801dd1b95..ee5d6720f23b 100644
--- a/arch/mips/galileo-boards/ev96100/irq.c
+++ b/arch/mips/galileo-boards/ev96100/irq.c
@@ -40,8 +40,6 @@
 #include <linux/interrupt.h>
 #include <asm/irq_cpu.h>
 
-extern asmlinkage void ev96100IRQ(void);
-
 static inline unsigned int ffz8(unsigned int word)
 {
 	unsigned long k;
@@ -54,13 +52,26 @@ static inline unsigned int ffz8(unsigned int word)
 	return k;
 }
 
+extern void mips_timer_interrupt(struct pt_regs *regs);
+
 asmlinkage void ev96100_cpu_irq(unsigned int pending, struct pt_regs *regs)
 {
 	do_IRQ(ffz8(pending >> 8), regs);
 }
 
+asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
+{
+	unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
+
+	if (pending & CAUSEF_IP7)
+		mips_timer_interrupt(regs);
+	else if (pending)
+		ev96100_cpu_irq(pending, regs);
+	else
+		spurious_interrupt(regs);
+}
+
 void __init arch_init_irq(void)
 {
-	set_except_vector(0, ev96100IRQ);
 	mips_cpu_irq_init(0);
 }