/* * (C) Finite State Machine Labs Inc. 1999 <business@fsmlabs.com> * * Released under the terms of GPL 2. * Open RTLinux makes use of a patented process described in * US Patent 5,995,745. Use of this process is governed * by the Open RTLinux Patent License which can be obtained from * www.fsmlabs.com/PATENT or by sending email to * licensequestions@fsmlabs.com */#include <linux/irq.h>#include <asm/uaccess.h>#include <asm/system.h>#include <asm/irq.h>#include <rtl_core.h>#include <rtl_sync.h>#include "arch.h"irq_desc_t rtl_hard_irq_desc[NR_IRQS];int last_irq = -1;int (*hard_do_IRQ)(int, struct pt_regs *);void (*mips_hard_sti)(void);void (*mips_hard_cli)(void);void (*mips_hard_save_flags_ptr)(unsigned long *);void (*mips_hard_save_and_cli_ptr)(unsigned long *);void (*mips_hard_restore_flags)(ulong);extern int (*do_IRQ)(int, struct pt_regs *);extern ulong soft_sti;void mips_ack(unsigned int irq){}void mips_end(unsigned int irq){	rtl_virt_enable(irq);}unsigned int mips_startup(unsigned int irq){	rtl_virt_enable(irq);	return 0;}intrtl_irq_set_affinity(unsigned int irq, const unsigned long *mask,		     unsigned long *oldmask){	return -1;}hw_irq_controller rtl_fake_pic ={ " RTLinux PIC  ", mips_startup, rtl_virt_disable, rtl_virt_enable,  rtl_virt_disable, mips_ack, mips_end};int mips_intercept(int irq, struct pt_regs *regs){	if (last_irq != -1)		printk("mips_intercept: last_irq set to %d current %d\n",		       last_irq, irq);	last_irq = irq;	return rtl_intercept(regs);}int arch_takeover(void){	int i;	void rtl_soft_sti_no_emulation(void);	__cli();	/* save and then replace the cli/sti calls */	mips_hard_sti = __sti;	mips_hard_cli = __cli;	mips_hard_save_flags_ptr = __save_flags_ptr;	mips_hard_save_and_cli_ptr = __save_and_cli_ptr;	mips_hard_restore_flags = __restore_flags;	__sti = rtl_soft_sti;	__cli = rtl_soft_cli;	__save_flags_ptr = rtl_soft_save_flags;	__save_and_cli_ptr = rtl_soft_save_and_cli;	__restore_flags = rtl_soft_restore_flags;	/* take over the call to do_IRQ */	hard_do_IRQ = do_IRQ;	do_IRQ = mips_intercept;	soft_sti = (ulong)rtl_soft_sti;	/* copy current irq handlers for safekeeping */	memcpy(rtl_hard_irq_desc, irq_desc, sizeof(irq_desc_t) * NR_IRQS);	/* then replace them with our fake one. */	for (i = 0; i < RTL_NR_IRQS; i++)		irq_desc[i].handler = &rtl_fake_pic;	rtl_hard_sti();	return 0;}void arch_giveup(void){	rtl_hard_cli();	/* restore the cli/sti calls */	__sti = mips_hard_sti;	__cli = mips_hard_cli;	__save_flags_ptr = mips_hard_save_flags_ptr;	__save_and_cli_ptr = mips_hard_save_and_cli_ptr;	__restore_flags = mips_hard_restore_flags;	do_IRQ = hard_do_IRQ;	soft_sti = 0;	/* copy irq handlers back */	memcpy(irq_desc, rtl_hard_irq_desc, sizeof(irq_desc_t) * NR_IRQS);	__sti();}void dispatch_rtl_local_irq(int irq){}int rtl_free_local_irq(int i, unsigned int cpu){	return 0;}intrtl_request_local_irq(int i, unsigned int (*handler) (struct pt_regs * r),		      unsigned int cpu){	return 0;}