[PATCH] m68k: separate handler for auto and user vector interrupt

Use separate entry points for auto and user vector interrupts and cleanup
naming a little.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

5 files changed, 71 insertions, 108 deletions

diff --git a/arch/m68k/atari/ataints.c b/arch/m68k/atari/ataints.c
index 076f47917842..bb54741dd6cd 100644
--- a/arch/m68k/atari/ataints.c
+++ b/arch/m68k/atari/ataints.c
@@ -314,7 +314,7 @@ __ALIGN_STR "\n\t"
         "rte");
 
 /* Defined in entry.S; only increments 'num_spurious' */
-asmlinkage void bad_interrupt(void);
+asmlinkage void bad_inthandler(void);
 
 extern void atari_microwire_cmd( int cmd );
 
@@ -337,7 +337,7 @@ void __init atari_init_IRQ(void)
 
         /* initialize the vector table */
         for (i = 0; i < NUM_INT_SOURCES; ++i) {
-                vectors[IRQ_SOURCE_TO_VECTOR(i)] = bad_interrupt;
+                vectors[IRQ_SOURCE_TO_VECTOR(i)] = bad_inthandler;
         }
 
         /* Initialize the MFP(s) */
@@ -461,7 +461,7 @@ int atari_request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, stru
                 return -EINVAL;
         }
 
-        if (vectors[vector] == bad_interrupt) {
+        if (vectors[vector] == bad_inthandler) {
                 /* int has no handler yet */
                 irq_handler[irq].handler = handler;
                 irq_handler[irq].dev_id  = dev_id;
@@ -528,7 +528,7 @@ void atari_free_irq(unsigned int irq, void *dev_id)
         }
 
         vector = IRQ_SOURCE_TO_VECTOR(irq);
-        if (vectors[vector] == bad_interrupt)
+        if (vectors[vector] == bad_inthandler)
                 goto not_found;
 
         local_irq_save(flags);
@@ -542,7 +542,7 @@ void atari_free_irq(unsigned int irq, void *dev_id)
                 irq_handler[irq].handler = NULL;
                 irq_handler[irq].dev_id  = NULL;
                 irq_param[irq].devname   = NULL;
-                vectors[vector] = bad_interrupt;
+                vectors[vector] = bad_inthandler;
                 /* If MFP int, also disable it */
                 atari_disable_irq(irq);
                 atari_turnoff_irq(irq);
@@ -617,7 +617,7 @@ int show_atari_interrupts(struct seq_file *p, void *v)
         int i;
 
         for (i = 0; i < NUM_INT_SOURCES; ++i) {
-                if (vectors[IRQ_SOURCE_TO_VECTOR(i)] == bad_interrupt)
+                if (vectors[IRQ_SOURCE_TO_VECTOR(i)] == bad_inthandler)
                         continue;
                 if (i < STMFP_SOURCE_BASE)
                         seq_printf(p, "auto %2d: %10u ",
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index 522079f8c2ba..1fb88f3311de 100644
--- a/arch/m68k/kernel/entry.S
+++ b/arch/m68k/kernel/entry.S
@@ -45,7 +45,7 @@
 #include <asm/asm-offsets.h>
 
 .globl system_call, buserr, trap, resume
-.globl inthandler, sys_call_table
+.globl sys_call_table
 .globl sys_fork, sys_clone, sys_vfork
 .globl ret_from_interrupt, bad_interrupt
 
@@ -191,44 +191,15 @@ do_delayed_trace:
         jbra    resume_userspace
 
 
-#if 0
-#ifdef CONFIG_AMIGA
-ami_inthandler:
-        addql   #1,irq_stat+CPUSTAT_LOCAL_IRQ_COUNT
-        SAVE_ALL_INT
-        GET_CURRENT(%d0)
-
-        bfextu  %sp@(PT_VECTOR){#4,#12},%d0
-        movel   %d0,%a0
-        addql   #1,%a0@(kstat+STAT_IRQ-VECOFF(VEC_SPUR))
-        movel   %a0@(autoirq_list-VECOFF(VEC_SPUR)),%a0
-
-| amiga vector int handler get the req mask instead of irq vector
-        lea     CUSTOMBASE,%a1
-        movew   %a1@(C_INTREQR),%d0
-        andw    %a1@(C_INTENAR),%d0
-
-| prepare stack (push frame pointer, dev_id & req mask)
-        pea     %sp@
-        movel   %a0@(IRQ_DEVID),%sp@-
-        movel   %d0,%sp@-
-        pea     %pc@(ret_from_interrupt:w)
-        jbra    @(IRQ_HANDLER,%a0)@(0)
-
-ENTRY(nmi_handler)
-        rte
-#endif
-#endif
+/* This is the main interrupt handler for autovector interrupts */
 
-/*
-** This is the main interrupt handler, responsible for calling process_int()
-*/
-inthandler:
+ENTRY(auto_inthandler)
         SAVE_ALL_INT
         GET_CURRENT(%d0)
         addqb   #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
                                         |  put exception # in d0
-        bfextu %sp@(PT_VECTOR){#4,#10},%d0
+        bfextu  %sp@(PT_VECTOR){#4,#10},%d0
+        subw    #VEC_SPUR,%d0
 
         movel   %sp,%sp@-
         movel   %d0,%sp@-               |  put vector # on stack
@@ -241,15 +212,16 @@ inthandler:
         jbra    3f
 1:
 #endif
-        jbsr    process_int             |  process the IRQ
+        jsr     m68k_handle_int         |  process the IRQ
 3:      addql   #8,%sp                  |  pop parameters off stack
 
 ret_from_interrupt:
         subqb   #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
-        jeq     1f
-2:
-        RESTORE_ALL
-1:
+        jeq     ret_from_last_interrupt
+2:      RESTORE_ALL
+
+        ALIGN
+ret_from_last_interrupt:
         moveq   #(~ALLOWINT>>8)&0xff,%d0
         andb    %sp@(PT_SR),%d0
         jne     2b
@@ -260,12 +232,40 @@ ret_from_interrupt:
         pea     ret_from_exception
         jra     do_softirq
 
+/* Handler for user defined interrupt vectors */
+
+ENTRY(mach_inthandler)
+        SAVE_ALL_INT
+        GET_CURRENT(%d0)
+        addqb   #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
+                                        |  put exception # in d0
+        bfextu  %sp@(PT_VECTOR){#4,#10},%d0
+
+        movel   %sp,%sp@-
+        movel   %d0,%sp@-               |  put vector # on stack
+        movel   mach_process_int,%a0
+        jsr     %a0@                    |  process the IRQ
+        addql   #8,%sp                  |  pop parameters off stack
+
+        subqb   #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
+        jeq     ret_from_last_interrupt
+        RESTORE_ALL
 
 /* Handler for uninitialized and spurious interrupts */
 
-bad_interrupt:
-        addql   #1,num_spurious
-        rte
+ENTRY(bad_inthandler)
+        SAVE_ALL_INT
+        GET_CURRENT(%d0)
+        addqb   #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
+
+        movel   %sp,%sp@-
+        jsr     handle_badint
+        addql   #4,%sp
+
+        subqb   #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
+        jeq     ret_from_last_interrupt
+        RESTORE_ALL
+
 
 ENTRY(sys_fork)
         SAVE_SWITCH_STACK
diff --git a/arch/m68k/kernel/ints.c b/arch/m68k/kernel/ints.c
index 4b85514792e7..895a56d69eba 100644
--- a/arch/m68k/kernel/ints.c
+++ b/arch/m68k/kernel/ints.c
@@ -248,19 +248,16 @@ static void dummy_free_irq(unsigned int irq, void *dev_id)
         printk("calling uninitialized disable_irq()\n");
 }
 
-asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
+asmlinkage void m68k_handle_int(unsigned int irq, struct pt_regs *regs)
 {
-        if (vec >= VEC_INT1 && vec <= VEC_INT7 && !MACH_IS_BVME6000) {
-                vec -= VEC_SPUR;
-                kstat_cpu(0).irqs[vec]++;
-                irq_list[vec].handler(vec, irq_list[vec].dev_id, fp);
-        } else {
-                if (mach_process_int)
-                        mach_process_int(vec, fp);
-                else
-                        panic("Can't process interrupt vector %ld\n", vec);
-                return;
-        }
+        kstat_cpu(0).irqs[irq]++;
+        irq_list[irq].handler(irq, irq_list[irq].dev_id, regs);
+}
+
+asmlinkage void handle_badint(struct pt_regs *regs)
+{
+        kstat_cpu(0).irqs[0]++;
+        printk("unexpected interrupt from %u\n", regs->vector);
 }
 
 int show_interrupts(struct seq_file *p, void *v)
diff --git a/arch/m68k/kernel/traps.c b/arch/m68k/kernel/traps.c
index 9adf378f8f1e..b19b951fd3e7 100644
--- a/arch/m68k/kernel/traps.c
+++ b/arch/m68k/kernel/traps.c
@@ -45,7 +45,6 @@
 asmlinkage void system_call(void);
 asmlinkage void buserr(void);
 asmlinkage void trap(void);
-asmlinkage void inthandler(void);
 asmlinkage void nmihandler(void);
 #ifdef CONFIG_M68KFPU_EMU
 asmlinkage void fpu_emu(void);
@@ -53,51 +52,7 @@ asmlinkage void fpu_emu(void);
 
 e_vector vectors[256] = {
         [VEC_BUSERR]    = buserr,
-        [VEC_ADDRERR]   = trap,
-        [VEC_ILLEGAL]   = trap,
-        [VEC_ZERODIV]   = trap,
-        [VEC_CHK]       = trap,
-        [VEC_TRAP]      = trap,
-        [VEC_PRIV]      = trap,
-        [VEC_TRACE]     = trap,
-        [VEC_LINE10]    = trap,
-        [VEC_LINE11]    = trap,
-        [VEC_RESV12]    = trap,
-        [VEC_COPROC]    = trap,
-        [VEC_FORMAT]    = trap,
-        [VEC_UNINT]     = trap,
-        [VEC_RESV16]    = trap,
-        [VEC_RESV17]    = trap,
-        [VEC_RESV18]    = trap,
-        [VEC_RESV19]    = trap,
-        [VEC_RESV20]    = trap,
-        [VEC_RESV21]    = trap,
-        [VEC_RESV22]    = trap,
-        [VEC_RESV23]    = trap,
-        [VEC_SPUR]      = inthandler,
-        [VEC_INT1]      = inthandler,
-        [VEC_INT2]      = inthandler,
-        [VEC_INT3]      = inthandler,
-        [VEC_INT4]      = inthandler,
-        [VEC_INT5]      = inthandler,
-        [VEC_INT6]      = inthandler,
-        [VEC_INT7]      = inthandler,
         [VEC_SYS]       = system_call,
-        [VEC_TRAP1]     = trap,
-        [VEC_TRAP2]     = trap,
-        [VEC_TRAP3]     = trap,
-        [VEC_TRAP4]     = trap,
-        [VEC_TRAP5]     = trap,
-        [VEC_TRAP6]     = trap,
-        [VEC_TRAP7]     = trap,
-        [VEC_TRAP8]     = trap,
-        [VEC_TRAP9]     = trap,
-        [VEC_TRAP10]    = trap,
-        [VEC_TRAP11]    = trap,
-        [VEC_TRAP12]    = trap,
-        [VEC_TRAP13]    = trap,
-        [VEC_TRAP14]    = trap,
-        [VEC_TRAP15]    = trap,
 };
 
 /* nmi handler for the Amiga */
@@ -132,12 +87,16 @@ void __init trap_init (void)
 {
         int i;
 
-        for (i = 48; i < 64; i++)
+        vectors[VEC_SPUR] = bad_inthandler;
+        for (i = VEC_INT1; i <= VEC_INT7; i++)
+                vectors[i] = auto_inthandler;
+
+        for (i = 0; i < VEC_USER; i++)
                 if (!vectors[i])
                         vectors[i] = trap;
 
-        for (i = 64; i < 256; i++)
-                vectors[i] = inthandler;
+        for (i = VEC_USER; i < 256; i++)
+                vectors[i] = mach_inthandler;
 
 #ifdef CONFIG_M68KFPU_EMU
         if (FPU_IS_EMU)
diff --git a/include/asm-m68k/traps.h b/include/asm-m68k/traps.h
index 475056191252..771519473285 100644
--- a/include/asm-m68k/traps.h
+++ b/include/asm-m68k/traps.h
@@ -13,8 +13,15 @@
 
 #ifndef __ASSEMBLY__
 
+#include <linux/linkage.h>
+#include <asm/ptrace.h>
+
 typedef void (*e_vector)(void);
 
+asmlinkage void auto_inthandler(void);
+asmlinkage void mach_inthandler(void);
+asmlinkage void bad_inthandler(void);
+
 extern e_vector vectors[];
 
 #endif