[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>

1 files changed, 59 insertions, 5 deletions

diff --git a/arch/mips/mips-boards/sim/sim_int.c b/arch/mips/mips-boards/sim/sim_int.c
index a4d0a2c05031..2c15c8efec4e 100644
--- a/arch/mips/mips-boards/sim/sim_int.c
+++ b/arch/mips/mips-boards/sim/sim_int.c
@@ -25,17 +25,71 @@
 
 extern void mips_cpu_irq_init(int);
 
-extern asmlinkage void simIRQ(void);
+static inline int clz(unsigned long x)
+{
+        __asm__ (
+        "       .set    push                                    \n"
+        "       .set    mips32                                  \n"
+        "       clz     %0, %1                                  \n"
+        "       .set    pop                                     \n"
+        : "=r" (x)
+        : "r" (x));
+
+        return x;
+}
+
+/*
+ * Version of ffs that only looks at bits 12..15.
+ */
+static inline unsigned int irq_ffs(unsigned int pending)
+{
+#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
+        return -clz(pending) + 31 - CAUSEB_IP;
+#else
+        unsigned int a0 = 7;
+        unsigned int t0;
+
+        t0 = s0 & 0xf000;
+        t0 = t0 < 1;
+        t0 = t0 << 2;
+        a0 = a0 - t0;
+        s0 = s0 << t0;
+
+        t0 = s0 & 0xc000;
+        t0 = t0 < 1;
+        t0 = t0 << 1;
+        a0 = a0 - t0;
+        s0 = s0 << t0;
 
-asmlinkage void sim_hw0_irqdispatch(struct pt_regs *regs)
+        t0 = s0 & 0x8000;
+        t0 = t0 < 1;
+        //t0 = t0 << 2;
+        a0 = a0 - t0;
+        //s0 = s0 << t0;
+
+        return a0;
+#endif
+}
+
+static inline void sim_hw0_irqdispatch(struct pt_regs *regs)
 {
         do_IRQ(2, regs);
 }
 
-void __init arch_init_irq(void)
+asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
 {
-        /* Now safe to set the exception vector. */
-        set_except_vector(0, simIRQ);
+        unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
+        int irq;
+
+        irq = irq_ffs(pending);
 
+        if (irq > 0)
+                do_IRQ(MIPSCPU_INT_BASE + irq, regs);
+        else
+                spurious_interrupt(regs);
+}
+
+void __init arch_init_irq(void)
+{
         mips_cpu_irq_init(MIPSCPU_INT_BASE);
 }