[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>

4 files changed, 23 insertions, 55 deletions

diff --git a/arch/mips/sgi-ip27/Makefile b/arch/mips/sgi-ip27/Makefile
index 4ba340780c35..686ba14e2882 100644
--- a/arch/mips/sgi-ip27/Makefile
+++ b/arch/mips/sgi-ip27/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the IP27 specific kernel interface routines under Linux.
 #
 
-obj-y	:= ip27-berr.o ip27-console.o ip27-irq.o ip27-init.o ip27-irq-glue.o \
+obj-y	:= ip27-berr.o ip27-console.o ip27-irq.o ip27-init.o \
 	   ip27-klconfig.o ip27-klnuma.o ip27-memory.o ip27-nmi.o ip27-reset.o \
 	   ip27-timer.o ip27-hubio.o ip27-xtalk.o
 
diff --git a/arch/mips/sgi-ip27/TODO b/arch/mips/sgi-ip27/TODO
index 32106131b0d0..19f1512c8f2e 100644
--- a/arch/mips/sgi-ip27/TODO
+++ b/arch/mips/sgi-ip27/TODO
@@ -9,10 +9,6 @@ ip27-init.c:find_lbaord_real. DONE
 in irix?
 6. Investigate why things do not work without the setup_test() call
 being invoked on all nodes in ip27-memory.c.
-7. Too many CLIs in the locore handlers :
-For the low level handlers set up by set_except_vector(),
-__tlb_refill_debug_tramp, __xtlb_refill_debug_tramp and cacheerror,
-investigate whether the code should do CLI, STI or KMODE.
 8. Too many do_page_faults invoked - investigate.
 9. start_thread must turn off UX64 ... and define tlb_refill_debug.
 10. Need a bad pmd table, bad pte table. __bad_pmd_table/__bad_pagetable
diff --git a/arch/mips/sgi-ip27/ip27-irq-glue.S b/arch/mips/sgi-ip27/ip27-irq-glue.S
deleted file mode 100644
index c304df715e0a..000000000000
--- a/arch/mips/sgi-ip27/ip27-irq-glue.S
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1999 Ralf Baechle
- * Copyright (C) 1999 Silicon Graphics, Inc.
- */
-#include <asm/asm.h>
-#include <asm/mipsregs.h>
-#include <asm/regdef.h>
-#include <asm/stackframe.h>
-
-	.text
-	.align	5
-NESTED(ip27_irq, PT_SIZE, sp)
-	SAVE_ALL
-	CLI
-
-	mfc0	s0, CP0_CAUSE
-	mfc0	t0, CP0_STATUS
-	and	s0, t0
-	move	a0, sp
-	PTR_LA	ra, ret_from_irq
-
-	/* First check for RT interrupt.  */
-	andi	t0, s0, CAUSEF_IP4
-	bnez	t0, ip4
-	andi	t0, s0, CAUSEF_IP2
-	bnez	t0, ip2
-	andi	t0, s0, CAUSEF_IP3
-	bnez	t0, ip3
-	andi	t0, s0, CAUSEF_IP5
-	bnez	t0, ip5
-	andi	t0, s0, CAUSEF_IP6
-	bnez	t0, ip6
-	j	ra
-
-ip2:	j	ip27_do_irq_mask0	# PI_INT_PEND_0 or CC_PEND_{A|B}
-ip3:	j	ip27_do_irq_mask1	# PI_INT_PEND_1
-ip4:	j	ip27_rt_timer_interrupt
-ip5:	j	ip27_prof_timer
-ip6:	j	ip27_hub_error
-
-	END(ip27_irq)
diff --git a/arch/mips/sgi-ip27/ip27-irq.c b/arch/mips/sgi-ip27/ip27-irq.c
index 2854ac4c9be1..2e643d2f51cb 100644
--- a/arch/mips/sgi-ip27/ip27-irq.c
+++ b/arch/mips/sgi-ip27/ip27-irq.c
@@ -130,7 +130,7 @@ static int ms1bit(unsigned long x)
  * Kanoj 05.13.00
  */
 
-void ip27_do_irq_mask0(struct pt_regs *regs)
+static void ip27_do_irq_mask0(struct pt_regs *regs)
 {
 	int irq, swlevel;
 	hubreg_t pend0, mask0;
@@ -171,7 +171,7 @@ void ip27_do_irq_mask0(struct pt_regs *regs)
 	LOCAL_HUB_L(PI_INT_PEND0);
 }
 
-void ip27_do_irq_mask1(struct pt_regs *regs)
+static void ip27_do_irq_mask1(struct pt_regs *regs)
 {
 	int irq, swlevel;
 	hubreg_t pend1, mask1;
@@ -196,12 +196,12 @@ void ip27_do_irq_mask1(struct pt_regs *regs)
 	LOCAL_HUB_L(PI_INT_PEND1);
 }
 
-void ip27_prof_timer(struct pt_regs *regs)
+static void ip27_prof_timer(struct pt_regs *regs)
 {
 	panic("CPU %d got a profiling interrupt", smp_processor_id());
 }
 
-void ip27_hub_error(struct pt_regs *regs)
+static void ip27_hub_error(struct pt_regs *regs)
 {
 	panic("CPU %d got a hub error interrupt", smp_processor_id());
 }
@@ -421,9 +421,26 @@ int __devinit request_bridge_irq(struct bridge_controller *bc)
 	return irq;
 }
 
+extern void ip27_rt_timer_interrupt(struct pt_regs *regs);
+
+asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
+{
+	unsigned long pending = read_c0_cause() & read_c0_status();
+
+	if (pending & CAUSEF_IP4)
+		ip27_rt_timer_interrupt(regs);
+	else if (pending & CAUSEF_IP2)	/* PI_INT_PEND_0 or CC_PEND_{A|B} */
+		ip27_do_irq_mask0(regs);
+	else if (pending & CAUSEF_IP3)	/* PI_INT_PEND_1 */
+		ip27_do_irq_mask1(regs);
+	else if (pending & CAUSEF_IP5)
+		ip27_prof_timer(regs);
+	else if (pending & CAUSEF_IP6)
+		ip27_hub_error(regs);
+}
+
 void __init arch_init_irq(void)
 {
-	set_except_vector(0, ip27_irq);
 }
 
 void install_ipi(void)