| /* |
| * Copyright (C) 2000 Jeff Dike (jdike@karaya.com) |
| * Licensed under the GPL |
| * Derived (i.e. mostly copied) from arch/i386/kernel/irq.c: |
| * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar |
| */ |
| |
| #include "linux/config.h" |
| #include "linux/kernel.h" |
| #include "linux/module.h" |
| #include "linux/smp.h" |
| #include "linux/irq.h" |
| #include "linux/kernel_stat.h" |
| #include "linux/interrupt.h" |
| #include "linux/random.h" |
| #include "linux/slab.h" |
| #include "linux/file.h" |
| #include "linux/proc_fs.h" |
| #include "linux/init.h" |
| #include "linux/seq_file.h" |
| #include "linux/profile.h" |
| #include "linux/hardirq.h" |
| #include "asm/irq.h" |
| #include "asm/hw_irq.h" |
| #include "asm/atomic.h" |
| #include "asm/signal.h" |
| #include "asm/system.h" |
| #include "asm/errno.h" |
| #include "asm/uaccess.h" |
| #include "user_util.h" |
| #include "kern_util.h" |
| #include "irq_user.h" |
| #include "irq_kern.h" |
| #include "os.h" |
| |
| /* |
| * Generic, controller-independent functions: |
| */ |
| |
| int show_interrupts(struct seq_file *p, void *v) |
| { |
| int i = *(loff_t *) v, j; |
| struct irqaction * action; |
| unsigned long flags; |
| |
| if (i == 0) { |
| seq_printf(p, " "); |
| for_each_online_cpu(j) |
| seq_printf(p, "CPU%d ",j); |
| seq_putc(p, '\n'); |
| } |
| |
| if (i < NR_IRQS) { |
| spin_lock_irqsave(&irq_desc[i].lock, flags); |
| action = irq_desc[i].action; |
| if (!action) |
| goto skip; |
| seq_printf(p, "%3d: ",i); |
| #ifndef CONFIG_SMP |
| seq_printf(p, "%10u ", kstat_irqs(i)); |
| #else |
| for_each_online_cpu(j) |
| seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); |
| #endif |
| seq_printf(p, " %14s", irq_desc[i].handler->typename); |
| seq_printf(p, " %s", action->name); |
| |
| for (action=action->next; action; action = action->next) |
| seq_printf(p, ", %s", action->name); |
| |
| seq_putc(p, '\n'); |
| skip: |
| spin_unlock_irqrestore(&irq_desc[i].lock, flags); |
| } else if (i == NR_IRQS) { |
| seq_putc(p, '\n'); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * do_IRQ handles all normal device IRQ's (the special |
| * SMP cross-CPU interrupts have their own specific |
| * handlers). |
| */ |
| unsigned int do_IRQ(int irq, union uml_pt_regs *regs) |
| { |
| irq_enter(); |
| __do_IRQ(irq, (struct pt_regs *) regs); |
| irq_exit(); |
| return 1; |
| } |
| |
| int um_request_irq(unsigned int irq, int fd, int type, |
| irqreturn_t (*handler)(int, void *, struct pt_regs *), |
| unsigned long irqflags, const char * devname, |
| void *dev_id) |
| { |
| int err; |
| |
| err = request_irq(irq, handler, irqflags, devname, dev_id); |
| if(err) |
| return(err); |
| |
| if(fd != -1) |
| err = activate_fd(irq, fd, type, dev_id); |
| return(err); |
| } |
| EXPORT_SYMBOL(um_request_irq); |
| EXPORT_SYMBOL(reactivate_fd); |
| |
| static DEFINE_SPINLOCK(irq_spinlock); |
| |
| unsigned long irq_lock(void) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&irq_spinlock, flags); |
| return(flags); |
| } |
| |
| void irq_unlock(unsigned long flags) |
| { |
| spin_unlock_irqrestore(&irq_spinlock, flags); |
| } |
| |
| /* hw_interrupt_type must define (startup || enable) && |
| * (shutdown || disable) && end */ |
| static void dummy(unsigned int irq) |
| { |
| } |
| |
| /* This is used for everything else than the timer. */ |
| static struct hw_interrupt_type normal_irq_type = { |
| .typename = "SIGIO", |
| .release = free_irq_by_irq_and_dev, |
| .disable = dummy, |
| .enable = dummy, |
| .ack = dummy, |
| .end = dummy |
| }; |
| |
| static struct hw_interrupt_type SIGVTALRM_irq_type = { |
| .typename = "SIGVTALRM", |
| .release = free_irq_by_irq_and_dev, |
| .shutdown = dummy, /* never called */ |
| .disable = dummy, |
| .enable = dummy, |
| .ack = dummy, |
| .end = dummy |
| }; |
| |
| void __init init_IRQ(void) |
| { |
| int i; |
| |
| irq_desc[TIMER_IRQ].status = IRQ_DISABLED; |
| irq_desc[TIMER_IRQ].action = NULL; |
| irq_desc[TIMER_IRQ].depth = 1; |
| irq_desc[TIMER_IRQ].handler = &SIGVTALRM_irq_type; |
| enable_irq(TIMER_IRQ); |
| for(i=1;i<NR_IRQS;i++){ |
| irq_desc[i].status = IRQ_DISABLED; |
| irq_desc[i].action = NULL; |
| irq_desc[i].depth = 1; |
| irq_desc[i].handler = &normal_irq_type; |
| enable_irq(i); |
| } |
| } |
| |
| int init_aio_irq(int irq, char *name, irqreturn_t (*handler)(int, void *, |
| struct pt_regs *)) |
| { |
| int fds[2], err; |
| |
| err = os_pipe(fds, 1, 1); |
| if(err){ |
| printk("init_aio_irq - os_pipe failed, err = %d\n", -err); |
| goto out; |
| } |
| |
| err = um_request_irq(irq, fds[0], IRQ_READ, handler, |
| SA_INTERRUPT | SA_SAMPLE_RANDOM, name, |
| (void *) (long) fds[0]); |
| if(err){ |
| printk("init_aio_irq - : um_request_irq failed, err = %d\n", |
| err); |
| goto out_close; |
| } |
| |
| err = fds[1]; |
| goto out; |
| |
| out_close: |
| os_close_file(fds[0]); |
| os_close_file(fds[1]); |
| out: |
| return(err); |
| } |