arch/m68knommu/platform/68360/ints.c - kernel/msm-4.9 - Gitiles

 /*
  * linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
  *
  * 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) 2000  Michael Leslie <mleslie@lineo.com>
  * Copyright (c) 1996 Roman Zippel
  * Copyright (c) 1999 D. Jeff Dionne <jeff@uclinux.org>
  */

 #include <linux/config.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/kernel_stat.h>
 #include <linux/errno.h>

 #include <asm/system.h>
 #include <asm/irq.h>
 #include <asm/traps.h>
 #include <asm/io.h>
 #include <asm/machdep.h>
 #include <asm/setup.h>
 #include <asm/m68360.h>

 /* from quicc/commproc.c: */
 extern QUICC *pquicc;
 extern void cpm_interrupt_init(void);

 #define INTERNAL_IRQS (96)

 /* assembler routines */
 asmlinkage void system_call(void);
 asmlinkage void buserr(void);
 asmlinkage void trap(void);
 asmlinkage irqreturn_t bad_interrupt(void);
 asmlinkage irqreturn_t inthandler(void);

 extern void *_ramvec[];

 /* The number of spurious interrupts */
 volatile unsigned int num_spurious;
 unsigned int local_irq_count[NR_CPUS];

 /* irq node variables for the 32 (potential) on chip sources */
 static irq_node_t int_irq_list[INTERNAL_IRQS];

 static short int_irq_ablecount[INTERNAL_IRQS];

 /*
  * This function should be called during kernel startup to initialize
  * IRQ handling routines.
  */

 void init_IRQ(void)
 {
 	int i;
 	int vba = (CPM_VECTOR_BASE<<4);

 	/* set up the vectors */
 	_ramvec[2] = buserr;
 	_ramvec[3] = trap;
 	_ramvec[4] = trap;
 	_ramvec[5] = trap;
 	_ramvec[6] = trap;
 	_ramvec[7] = trap;
 	_ramvec[8] = trap;
 	_ramvec[9] = trap;
 	_ramvec[10] = trap;
 	_ramvec[11] = trap;
 	_ramvec[12] = trap;
 	_ramvec[13] = trap;
 	_ramvec[14] = trap;
 	_ramvec[15] = trap;

 	_ramvec[32] = system_call;
 	_ramvec[33] = trap;


 	cpm_interrupt_init();

 	/* set up CICR for vector base address and irq level */
 	/* irl = 4, hp = 1f - see MC68360UM p 7-377 */
 	pquicc->intr_cicr = 0x00e49f00 | vba;

 	/* CPM interrupt vectors: (p 7-376) */
 	_ramvec[vba+CPMVEC_ERROR]       = bad_interrupt; /* Error */
 	_ramvec[vba+CPMVEC_PIO_PC11]    = inthandler;   /* pio - pc11 */
 	_ramvec[vba+CPMVEC_PIO_PC10]    = inthandler;   /* pio - pc10 */
 	_ramvec[vba+CPMVEC_SMC2]        = inthandler;   /* smc2/pip */
 	_ramvec[vba+CPMVEC_SMC1]        = inthandler;   /* smc1 */
 	_ramvec[vba+CPMVEC_SPI]         = inthandler;   /* spi */
 	_ramvec[vba+CPMVEC_PIO_PC9]     = inthandler;   /* pio - pc9 */
 	_ramvec[vba+CPMVEC_TIMER4]      = inthandler;   /* timer 4 */
 	_ramvec[vba+CPMVEC_RESERVED1]   = inthandler;   /* reserved */
 	_ramvec[vba+CPMVEC_PIO_PC8]     = inthandler;   /* pio - pc8 */
 	_ramvec[vba+CPMVEC_PIO_PC7]     = inthandler;  /* pio - pc7 */
 	_ramvec[vba+CPMVEC_PIO_PC6]     = inthandler;  /* pio - pc6 */
 	_ramvec[vba+CPMVEC_TIMER3]      = inthandler;  /* timer 3 */
 	_ramvec[vba+CPMVEC_RISCTIMER]   = inthandler;  /* reserved */
 	_ramvec[vba+CPMVEC_PIO_PC5]     = inthandler;  /* pio - pc5 */
 	_ramvec[vba+CPMVEC_PIO_PC4]     = inthandler;  /* pio - pc4 */
 	_ramvec[vba+CPMVEC_RESERVED2]   = inthandler;  /* reserved */
 	_ramvec[vba+CPMVEC_RISCTIMER]   = inthandler;  /* timer table */
 	_ramvec[vba+CPMVEC_TIMER2]      = inthandler;  /* timer 2 */
 	_ramvec[vba+CPMVEC_RESERVED3]   = inthandler;  /* reserved */
 	_ramvec[vba+CPMVEC_IDMA2]       = inthandler;  /* idma 2 */
 	_ramvec[vba+CPMVEC_IDMA1]       = inthandler;  /* idma 1 */
 	_ramvec[vba+CPMVEC_SDMA_CB_ERR] = inthandler;  /* sdma channel bus error */
 	_ramvec[vba+CPMVEC_PIO_PC3]     = inthandler;  /* pio - pc3 */
 	_ramvec[vba+CPMVEC_PIO_PC2]     = inthandler;  /* pio - pc2 */
 	/* _ramvec[vba+CPMVEC_TIMER1]      = cpm_isr_timer1; */  /* timer 1 */
 	_ramvec[vba+CPMVEC_TIMER1]      = inthandler;  /* timer 1 */
 	_ramvec[vba+CPMVEC_PIO_PC1]     = inthandler;  /* pio - pc1 */
 	_ramvec[vba+CPMVEC_SCC4]        = inthandler;  /* scc 4 */
 	_ramvec[vba+CPMVEC_SCC3]        = inthandler;  /* scc 3 */
 	_ramvec[vba+CPMVEC_SCC2]        = inthandler;  /* scc 2 */
 	_ramvec[vba+CPMVEC_SCC1]        = inthandler;  /* scc 1 */
 	_ramvec[vba+CPMVEC_PIO_PC0]     = inthandler;  /* pio - pc0 */


 	/* turn off all CPM interrupts */
 	pquicc->intr_cimr = 0x00000000;

 	/* initialize handlers */
 	for (i = 0; i < INTERNAL_IRQS; i++) {
 		int_irq_list[i].handler = NULL;
 		int_irq_list[i].flags   = IRQ_FLG_STD;
 		int_irq_list[i].dev_id  = NULL;
 		int_irq_list[i].devname = NULL;
 	}
 }

 #if 0
 void M68360_insert_irq(irq_node_t **list, irq_node_t *node)
 {
 	unsigned long flags;
 	irq_node_t *cur;

 	if (!node->dev_id)
 		printk(KERN_INFO "%s: Warning: dev_id of %s is zero\n",
 		       __FUNCTION__, node->devname);

 	local_irq_save(flags);

 	cur = *list;

 	while (cur) {
 		list = &cur->next;
 		cur = cur->next;
 	}

 	node->next = cur;
 	*list = node;

 	local_irq_restore(flags);
 }

 void M68360_delete_irq(irq_node_t **list, void *dev_id)
 {
 	unsigned long flags;
 	irq_node_t *node;

 	local_irq_save(flags);

 	for (node = *list; node; list = &node->next, node = *list) {
 		if (node->dev_id == dev_id) {
 			*list = node->next;
 			/* Mark it as free. */
 			node->handler = NULL;
 			local_irq_restore(flags);
 			return;
 		}
 	}
 	local_irq_restore(flags);
 	printk (KERN_INFO "%s: tried to remove invalid irq\n", __FUNCTION__);
 }
 #endif

 int request_irq(
 	unsigned int irq,
 	irqreturn_t (*handler)(int, void *, struct pt_regs *),
 	unsigned long flags,
 	const char *devname,
 	void *dev_id)
 {
 	int mask = (1<<irq);

 	irq += (CPM_VECTOR_BASE<<4);

 	if (irq >= INTERNAL_IRQS) {
 		printk (KERN_ERR "%s: Unknown IRQ %d from %s\n", __FUNCTION__, irq, devname);
 		return -ENXIO;
 	}

 	if (!(int_irq_list[irq].flags & IRQ_FLG_STD)) {
 		if (int_irq_list[irq].flags & IRQ_FLG_LOCK) {
 			printk(KERN_ERR "%s: IRQ %d from %s is not replaceable\n",
 			       __FUNCTION__, irq, int_irq_list[irq].devname);
 			return -EBUSY;
 		}
 		if (flags & IRQ_FLG_REPLACE) {
 			printk(KERN_ERR "%s: %s can't replace IRQ %d from %s\n",
 			       __FUNCTION__, devname, irq, int_irq_list[irq].devname);
 			return -EBUSY;
 		}
 	}
 	int_irq_list[irq].handler = handler;
 	int_irq_list[irq].flags   = flags;
 	int_irq_list[irq].dev_id  = dev_id;
 	int_irq_list[irq].devname = devname;

 	/* enable in the CIMR */
 	if (!int_irq_ablecount[irq])
 		pquicc->intr_cimr |= mask;
 	/*      *(volatile unsigned long *)0xfffff304 &= ~(1<<irq); */

 	return 0;
 }

 EXPORT_SYMBOL(request_irq);

 void free_irq(unsigned int irq, void *dev_id)
 {
 	if (irq >= INTERNAL_IRQS) {
 		printk (KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
 		return;
 	}

 	if (int_irq_list[irq].dev_id != dev_id)
 		printk(KERN_INFO "%s: removing probably wrong IRQ %d from %s\n",
 		       __FUNCTION__, irq, int_irq_list[irq].devname);
 	int_irq_list[irq].handler = NULL;
 	int_irq_list[irq].flags   = IRQ_FLG_STD;
 	int_irq_list[irq].dev_id  = NULL;
 	int_irq_list[irq].devname = NULL;

 	*(volatile unsigned long *)0xfffff304 |= 1<<irq;
 }

 EXPORT_SYMBOL(free_irq);

 #if 0
 /*
  * Enable/disable a particular machine specific interrupt source.
  * Note that this may affect other interrupts in case of a shared interrupt.
  * This function should only be called for a _very_ short time to change some
  * internal data, that may not be changed by the interrupt at the same time.
  * int_(enable|disable)_irq calls may also be nested.
  */
 void M68360_enable_irq(unsigned int irq)
 {
 	if (irq >= INTERNAL_IRQS) {
 		printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
 		return;
 	}

 	if (--int_irq_ablecount[irq])
 		return;

 	/* enable the interrupt */
 	*(volatile unsigned long *)0xfffff304 &= ~(1<<irq);
 }

 void M68360_disable_irq(unsigned int irq)
 {
 	if (irq >= INTERNAL_IRQS) {
 		printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
 		return;
 	}

 	if (int_irq_ablecount[irq]++)
 		return;

 	/* disable the interrupt */
 	*(volatile unsigned long *)0xfffff304 |= 1<<irq;
 }
 #endif

 int show_interrupts(struct seq_file *p, void *v)
 {
 	int i = *(loff_t *) v;

 	if (i < NR_IRQS) {
 		if (int_irq_list[i].devname) {
 			seq_printf(p, "%3d: %10u ", i, kstat_cpu(0).irqs[i]);
 			if (int_irq_list[i].flags & IRQ_FLG_LOCK)
 				seq_printf(p, "L ");
 			else
 				seq_printf(p, "  ");
 			seq_printf(p, "%s\n", int_irq_list[i].devname);
 		}
 	}
 	if (i == NR_IRQS)
 		seq_printf(p, "   : %10u   spurious\n", num_spurious);

 	return 0;
 }

 /* The 68k family did not have a good way to determine the source
  * of interrupts until later in the family.  The EC000 core does
  * not provide the vector number on the stack, we vector everything
  * into one vector and look in the blasted mask register...
  * This code is designed to be fast, almost constant time, not clean!
  */
 void process_int(int vec, struct pt_regs *fp)
 {
 	int irq;
 	int mask;

 	/* unsigned long pend = *(volatile unsigned long *)0xfffff30c; */

 	/* irq = vec + (CPM_VECTOR_BASE<<4); */
 	irq = vec;

 	/* unsigned long pend = *(volatile unsigned long *)pquicc->intr_cipr; */

 	/* Bugger all that weirdness. For the moment, I seem to know where I came from;
 	 * vec is passed from a specific ISR, so I'll use it. */

 	if (int_irq_list[irq].handler) {
 		int_irq_list[irq].handler(irq , int_irq_list[irq].dev_id, fp);
 		kstat_cpu(0).irqs[irq]++;
 		pquicc->intr_cisr = (1 << vec); /* indicate that irq has been serviced */
 	} else {
 		printk(KERN_ERR "unregistered interrupt %d!\nTurning it off in the CIMR...\n", irq);
 		/* *(volatile unsigned long *)0xfffff304 |= mask; */
 		pquicc->intr_cimr &= ~(1 << vec);
 		num_spurious += 1;
 	}
 	return(IRQ_HANDLED);
 }
	/*
	* linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
	*
	* 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) 2000 Michael Leslie <mleslie@lineo.com>
	* Copyright (c) 1996 Roman Zippel
	* Copyright (c) 1999 D. Jeff Dionne <jeff@uclinux.org>
	*/

	#include <linux/config.h>
	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/kernel.h>
	#include <linux/sched.h>
	#include <linux/kernel_stat.h>
	#include <linux/errno.h>

	#include <asm/system.h>
	#include <asm/irq.h>
	#include <asm/traps.h>
	#include <asm/io.h>
	#include <asm/machdep.h>
	#include <asm/setup.h>
	#include <asm/m68360.h>

	/* from quicc/commproc.c: */
	extern QUICC *pquicc;
	extern void cpm_interrupt_init(void);

	#define INTERNAL_IRQS (96)

	/* assembler routines */
	asmlinkage void system_call(void);
	asmlinkage void buserr(void);
	asmlinkage void trap(void);
	asmlinkage irqreturn_t bad_interrupt(void);
	asmlinkage irqreturn_t inthandler(void);

	extern void *_ramvec[];

	/* The number of spurious interrupts */
	volatile unsigned int num_spurious;
	unsigned int local_irq_count[NR_CPUS];

	/* irq node variables for the 32 (potential) on chip sources */
	static irq_node_t int_irq_list[INTERNAL_IRQS];

	static short int_irq_ablecount[INTERNAL_IRQS];

	/*
	* This function should be called during kernel startup to initialize
	* IRQ handling routines.
	*/

	void init_IRQ(void)
	{
	int i;
	int vba = (CPM_VECTOR_BASE<<4);

	/* set up the vectors */
	_ramvec[2] = buserr;
	_ramvec[3] = trap;
	_ramvec[4] = trap;
	_ramvec[5] = trap;
	_ramvec[6] = trap;
	_ramvec[7] = trap;
	_ramvec[8] = trap;
	_ramvec[9] = trap;
	_ramvec[10] = trap;
	_ramvec[11] = trap;
	_ramvec[12] = trap;
	_ramvec[13] = trap;
	_ramvec[14] = trap;
	_ramvec[15] = trap;

	_ramvec[32] = system_call;
	_ramvec[33] = trap;


	cpm_interrupt_init();

	/* set up CICR for vector base address and irq level */
	/* irl = 4, hp = 1f - see MC68360UM p 7-377 */
	pquicc->intr_cicr = 0x00e49f00 \| vba;

	/* CPM interrupt vectors: (p 7-376) */
	_ramvec[vba+CPMVEC_ERROR] = bad_interrupt; /* Error */
	_ramvec[vba+CPMVEC_PIO_PC11] = inthandler; /* pio - pc11 */
	_ramvec[vba+CPMVEC_PIO_PC10] = inthandler; /* pio - pc10 */
	_ramvec[vba+CPMVEC_SMC2] = inthandler; /* smc2/pip */
	_ramvec[vba+CPMVEC_SMC1] = inthandler; /* smc1 */
	_ramvec[vba+CPMVEC_SPI] = inthandler; /* spi */
	_ramvec[vba+CPMVEC_PIO_PC9] = inthandler; /* pio - pc9 */
	_ramvec[vba+CPMVEC_TIMER4] = inthandler; /* timer 4 */
	_ramvec[vba+CPMVEC_RESERVED1] = inthandler; /* reserved */
	_ramvec[vba+CPMVEC_PIO_PC8] = inthandler; /* pio - pc8 */
	_ramvec[vba+CPMVEC_PIO_PC7] = inthandler; /* pio - pc7 */
	_ramvec[vba+CPMVEC_PIO_PC6] = inthandler; /* pio - pc6 */
	_ramvec[vba+CPMVEC_TIMER3] = inthandler; /* timer 3 */
	_ramvec[vba+CPMVEC_RISCTIMER] = inthandler; /* reserved */
	_ramvec[vba+CPMVEC_PIO_PC5] = inthandler; /* pio - pc5 */
	_ramvec[vba+CPMVEC_PIO_PC4] = inthandler; /* pio - pc4 */
	_ramvec[vba+CPMVEC_RESERVED2] = inthandler; /* reserved */
	_ramvec[vba+CPMVEC_RISCTIMER] = inthandler; /* timer table */
	_ramvec[vba+CPMVEC_TIMER2] = inthandler; /* timer 2 */
	_ramvec[vba+CPMVEC_RESERVED3] = inthandler; /* reserved */
	_ramvec[vba+CPMVEC_IDMA2] = inthandler; /* idma 2 */
	_ramvec[vba+CPMVEC_IDMA1] = inthandler; /* idma 1 */
	_ramvec[vba+CPMVEC_SDMA_CB_ERR] = inthandler; /* sdma channel bus error */
	_ramvec[vba+CPMVEC_PIO_PC3] = inthandler; /* pio - pc3 */
	_ramvec[vba+CPMVEC_PIO_PC2] = inthandler; /* pio - pc2 */
	/* _ramvec[vba+CPMVEC_TIMER1] = cpm_isr_timer1; / / timer 1 */
	_ramvec[vba+CPMVEC_TIMER1] = inthandler; /* timer 1 */
	_ramvec[vba+CPMVEC_PIO_PC1] = inthandler; /* pio - pc1 */
	_ramvec[vba+CPMVEC_SCC4] = inthandler; /* scc 4 */
	_ramvec[vba+CPMVEC_SCC3] = inthandler; /* scc 3 */
	_ramvec[vba+CPMVEC_SCC2] = inthandler; /* scc 2 */
	_ramvec[vba+CPMVEC_SCC1] = inthandler; /* scc 1 */
	_ramvec[vba+CPMVEC_PIO_PC0] = inthandler; /* pio - pc0 */


	/* turn off all CPM interrupts */
	pquicc->intr_cimr = 0x00000000;

	/* initialize handlers */
	for (i = 0; i < INTERNAL_IRQS; i++) {
	int_irq_list[i].handler = NULL;
	int_irq_list[i].flags = IRQ_FLG_STD;
	int_irq_list[i].dev_id = NULL;
	int_irq_list[i].devname = NULL;
	}
	}

	#if 0
	void M68360_insert_irq(irq_node_t *list, irq_node_t node)
	{
	unsigned long flags;
	irq_node_t *cur;

	if (!node->dev_id)
	printk(KERN_INFO "%s: Warning: dev_id of %s is zero\n",
	__FUNCTION__, node->devname);

	local_irq_save(flags);

	cur = *list;

	while (cur) {
	list = &cur->next;
	cur = cur->next;
	}

	node->next = cur;
	*list = node;

	local_irq_restore(flags);
	}

	void M68360_delete_irq(irq_node_t *list, void dev_id)
	{
	unsigned long flags;
	irq_node_t *node;

	local_irq_save(flags);

	for (node = list; node; list = &node->next, node = list) {
	if (node->dev_id == dev_id) {
	*list = node->next;
	/* Mark it as free. */
	node->handler = NULL;
	local_irq_restore(flags);
	return;
	}
	}
	local_irq_restore(flags);
	printk (KERN_INFO "%s: tried to remove invalid irq\n", __FUNCTION__);
	}
	#endif

	int request_irq(
	unsigned int irq,
	irqreturn_t (handler)(int, void , struct pt_regs *),
	unsigned long flags,
	const char *devname,
	void *dev_id)
	{
	int mask = (1<<irq);

	irq += (CPM_VECTOR_BASE<<4);

	if (irq >= INTERNAL_IRQS) {
	printk (KERN_ERR "%s: Unknown IRQ %d from %s\n", __FUNCTION__, irq, devname);
	return -ENXIO;
	}

	if (!(int_irq_list[irq].flags & IRQ_FLG_STD)) {
	if (int_irq_list[irq].flags & IRQ_FLG_LOCK) {
	printk(KERN_ERR "%s: IRQ %d from %s is not replaceable\n",
	__FUNCTION__, irq, int_irq_list[irq].devname);
	return -EBUSY;
	}
	if (flags & IRQ_FLG_REPLACE) {
	printk(KERN_ERR "%s: %s can't replace IRQ %d from %s\n",
	__FUNCTION__, devname, irq, int_irq_list[irq].devname);
	return -EBUSY;
	}
	}
	int_irq_list[irq].handler = handler;
	int_irq_list[irq].flags = flags;
	int_irq_list[irq].dev_id = dev_id;
	int_irq_list[irq].devname = devname;

	/* enable in the CIMR */
	if (!int_irq_ablecount[irq])
	pquicc->intr_cimr \|= mask;
	/* (volatile unsigned long )0xfffff304 &= ~(1<<irq); */

	return 0;
	}

	EXPORT_SYMBOL(request_irq);

	void free_irq(unsigned int irq, void *dev_id)
	{
	if (irq >= INTERNAL_IRQS) {
	printk (KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
	return;
	}

	if (int_irq_list[irq].dev_id != dev_id)
	printk(KERN_INFO "%s: removing probably wrong IRQ %d from %s\n",
	__FUNCTION__, irq, int_irq_list[irq].devname);
	int_irq_list[irq].handler = NULL;
	int_irq_list[irq].flags = IRQ_FLG_STD;
	int_irq_list[irq].dev_id = NULL;
	int_irq_list[irq].devname = NULL;

	(volatile unsigned long )0xfffff304 \|= 1<<irq;
	}

	EXPORT_SYMBOL(free_irq);

	#if 0
	/*
	* Enable/disable a particular machine specific interrupt source.
	* Note that this may affect other interrupts in case of a shared interrupt.
	* This function should only be called for a _very_ short time to change some
	* internal data, that may not be changed by the interrupt at the same time.
	* int_(enable\|disable)_irq calls may also be nested.
	*/
	void M68360_enable_irq(unsigned int irq)
	{
	if (irq >= INTERNAL_IRQS) {
	printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
	return;
	}

	if (--int_irq_ablecount[irq])
	return;

	/* enable the interrupt */
	(volatile unsigned long )0xfffff304 &= ~(1<<irq);
	}

	void M68360_disable_irq(unsigned int irq)
	{
	if (irq >= INTERNAL_IRQS) {
	printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
	return;
	}

	if (int_irq_ablecount[irq]++)
	return;

	/* disable the interrupt */
	(volatile unsigned long )0xfffff304 \|= 1<<irq;
	}
	#endif

	int show_interrupts(struct seq_file p, void v)
	{
	int i = (loff_t ) v;

	if (i < NR_IRQS) {
	if (int_irq_list[i].devname) {
	seq_printf(p, "%3d: %10u ", i, kstat_cpu(0).irqs[i]);
	if (int_irq_list[i].flags & IRQ_FLG_LOCK)
	seq_printf(p, "L ");
	else
	seq_printf(p, " ");
	seq_printf(p, "%s\n", int_irq_list[i].devname);
	}
	}
	if (i == NR_IRQS)
	seq_printf(p, " : %10u spurious\n", num_spurious);

	return 0;
	}

	/* The 68k family did not have a good way to determine the source
	* of interrupts until later in the family. The EC000 core does
	* not provide the vector number on the stack, we vector everything
	* into one vector and look in the blasted mask register...
	* This code is designed to be fast, almost constant time, not clean!
	*/
	void process_int(int vec, struct pt_regs *fp)
	{
	int irq;
	int mask;

	/* unsigned long pend = (volatile unsigned long )0xfffff30c; */

	/* irq = vec + (CPM_VECTOR_BASE<<4); */
	irq = vec;

	/* unsigned long pend = (volatile unsigned long )pquicc->intr_cipr; */

	/* Bugger all that weirdness. For the moment, I seem to know where I came from;
	* vec is passed from a specific ISR, so I'll use it. */

	if (int_irq_list[irq].handler) {
	int_irq_list[irq].handler(irq , int_irq_list[irq].dev_id, fp);
	kstat_cpu(0).irqs[irq]++;
	pquicc->intr_cisr = (1 << vec); /* indicate that irq has been serviced */
	} else {
	printk(KERN_ERR "unregistered interrupt %d!\nTurning it off in the CIMR...\n", irq);
	/* (volatile unsigned long )0xfffff304 \|= mask; */
	pquicc->intr_cimr &= ~(1 << vec);
	num_spurious += 1;
	}
	return(IRQ_HANDLED);
	}