2005-04-16 16:20:36 -06:00
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/init.h>
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#include <linux/kernel_stat.h>
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#include <linux/sysdev.h>
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#include <linux/bitops.h>
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#include <asm/atomic.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/timer.h>
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#include <asm/pgtable.h>
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#include <asm/delay.h>
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#include <asm/desc.h>
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#include <asm/apic.h>
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#include <asm/arch_hooks.h>
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#include <asm/i8259.h>
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#include <io_ports.h>
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/*
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* This is the 'legacy' 8259A Programmable Interrupt Controller,
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* present in the majority of PC/AT boxes.
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* plus some generic x86 specific things if generic specifics makes
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* any sense at all.
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* this file should become arch/i386/kernel/irq.c when the old irq.c
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* moves to arch independent land
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*/
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2006-09-26 02:52:41 -06:00
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static int i8259A_auto_eoi;
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2006-10-04 03:16:26 -06:00
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DEFINE_SPINLOCK(i8259A_lock);
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2005-04-16 16:20:36 -06:00
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static void mask_and_ack_8259A(unsigned int);
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2006-10-04 03:16:26 -06:00
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static struct irq_chip i8259A_chip = {
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.name = "XT-PIC",
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.mask = disable_8259A_irq,
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2007-02-16 02:28:24 -07:00
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.disable = disable_8259A_irq,
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2006-10-04 03:16:26 -06:00
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.unmask = enable_8259A_irq,
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.mask_ack = mask_and_ack_8259A,
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2005-04-16 16:20:36 -06:00
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};
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/*
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* 8259A PIC functions to handle ISA devices:
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*/
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/*
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* This contains the irq mask for both 8259A irq controllers,
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*/
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unsigned int cached_irq_mask = 0xffff;
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/*
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* Not all IRQs can be routed through the IO-APIC, eg. on certain (older)
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* boards the timer interrupt is not really connected to any IO-APIC pin,
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* it's fed to the master 8259A's IR0 line only.
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*
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* Any '1' bit in this mask means the IRQ is routed through the IO-APIC.
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* this 'mixed mode' IRQ handling costs nothing because it's only used
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* at IRQ setup time.
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*/
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unsigned long io_apic_irqs;
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void disable_8259A_irq(unsigned int irq)
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{
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unsigned int mask = 1 << irq;
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unsigned long flags;
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spin_lock_irqsave(&i8259A_lock, flags);
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cached_irq_mask |= mask;
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if (irq & 8)
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outb(cached_slave_mask, PIC_SLAVE_IMR);
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else
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outb(cached_master_mask, PIC_MASTER_IMR);
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spin_unlock_irqrestore(&i8259A_lock, flags);
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}
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void enable_8259A_irq(unsigned int irq)
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{
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unsigned int mask = ~(1 << irq);
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unsigned long flags;
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spin_lock_irqsave(&i8259A_lock, flags);
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cached_irq_mask &= mask;
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if (irq & 8)
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outb(cached_slave_mask, PIC_SLAVE_IMR);
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else
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outb(cached_master_mask, PIC_MASTER_IMR);
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spin_unlock_irqrestore(&i8259A_lock, flags);
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}
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int i8259A_irq_pending(unsigned int irq)
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{
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unsigned int mask = 1<<irq;
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&i8259A_lock, flags);
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if (irq < 8)
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ret = inb(PIC_MASTER_CMD) & mask;
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else
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ret = inb(PIC_SLAVE_CMD) & (mask >> 8);
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spin_unlock_irqrestore(&i8259A_lock, flags);
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return ret;
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}
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void make_8259A_irq(unsigned int irq)
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{
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disable_irq_nosync(irq);
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io_apic_irqs &= ~(1<<irq);
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2006-10-17 01:10:03 -06:00
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set_irq_chip_and_handler_name(irq, &i8259A_chip, handle_level_irq,
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"XT");
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2005-04-16 16:20:36 -06:00
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enable_irq(irq);
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}
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/*
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* This function assumes to be called rarely. Switching between
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* 8259A registers is slow.
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* This has to be protected by the irq controller spinlock
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* before being called.
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*/
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static inline int i8259A_irq_real(unsigned int irq)
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{
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int value;
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int irqmask = 1<<irq;
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if (irq < 8) {
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outb(0x0B,PIC_MASTER_CMD); /* ISR register */
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value = inb(PIC_MASTER_CMD) & irqmask;
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outb(0x0A,PIC_MASTER_CMD); /* back to the IRR register */
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return value;
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}
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outb(0x0B,PIC_SLAVE_CMD); /* ISR register */
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value = inb(PIC_SLAVE_CMD) & (irqmask >> 8);
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outb(0x0A,PIC_SLAVE_CMD); /* back to the IRR register */
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return value;
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}
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/*
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* Careful! The 8259A is a fragile beast, it pretty
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* much _has_ to be done exactly like this (mask it
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* first, _then_ send the EOI, and the order of EOI
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* to the two 8259s is important!
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*/
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static void mask_and_ack_8259A(unsigned int irq)
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{
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unsigned int irqmask = 1 << irq;
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unsigned long flags;
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spin_lock_irqsave(&i8259A_lock, flags);
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/*
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* Lightweight spurious IRQ detection. We do not want
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* to overdo spurious IRQ handling - it's usually a sign
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* of hardware problems, so we only do the checks we can
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2006-06-26 10:35:02 -06:00
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* do without slowing down good hardware unnecessarily.
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2005-04-16 16:20:36 -06:00
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*
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* Note that IRQ7 and IRQ15 (the two spurious IRQs
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* usually resulting from the 8259A-1|2 PICs) occur
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* even if the IRQ is masked in the 8259A. Thus we
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* can check spurious 8259A IRQs without doing the
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* quite slow i8259A_irq_real() call for every IRQ.
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* This does not cover 100% of spurious interrupts,
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* but should be enough to warn the user that there
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* is something bad going on ...
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*/
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if (cached_irq_mask & irqmask)
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goto spurious_8259A_irq;
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cached_irq_mask |= irqmask;
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handle_real_irq:
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if (irq & 8) {
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inb(PIC_SLAVE_IMR); /* DUMMY - (do we need this?) */
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outb(cached_slave_mask, PIC_SLAVE_IMR);
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outb(0x60+(irq&7),PIC_SLAVE_CMD);/* 'Specific EOI' to slave */
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outb(0x60+PIC_CASCADE_IR,PIC_MASTER_CMD); /* 'Specific EOI' to master-IRQ2 */
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} else {
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inb(PIC_MASTER_IMR); /* DUMMY - (do we need this?) */
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outb(cached_master_mask, PIC_MASTER_IMR);
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outb(0x60+irq,PIC_MASTER_CMD); /* 'Specific EOI to master */
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}
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spin_unlock_irqrestore(&i8259A_lock, flags);
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return;
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spurious_8259A_irq:
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/*
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* this is the slow path - should happen rarely.
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*/
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if (i8259A_irq_real(irq))
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/*
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* oops, the IRQ _is_ in service according to the
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* 8259A - not spurious, go handle it.
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*/
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goto handle_real_irq;
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{
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static int spurious_irq_mask;
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/*
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* At this point we can be sure the IRQ is spurious,
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* lets ACK and report it. [once per IRQ]
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*/
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if (!(spurious_irq_mask & irqmask)) {
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printk(KERN_DEBUG "spurious 8259A interrupt: IRQ%d.\n", irq);
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spurious_irq_mask |= irqmask;
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}
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atomic_inc(&irq_err_count);
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/*
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* Theoretically we do not have to handle this IRQ,
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* but in Linux this does not cause problems and is
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* simpler for us.
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*/
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goto handle_real_irq;
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}
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}
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static char irq_trigger[2];
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/**
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* ELCR registers (0x4d0, 0x4d1) control edge/level of IRQ
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*/
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static void restore_ELCR(char *trigger)
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{
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outb(trigger[0], 0x4d0);
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outb(trigger[1], 0x4d1);
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}
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static void save_ELCR(char *trigger)
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{
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/* IRQ 0,1,2,8,13 are marked as reserved */
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trigger[0] = inb(0x4d0) & 0xF8;
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trigger[1] = inb(0x4d1) & 0xDE;
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}
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static int i8259A_resume(struct sys_device *dev)
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{
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2006-09-26 02:52:41 -06:00
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init_8259A(i8259A_auto_eoi);
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2005-04-16 16:20:36 -06:00
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restore_ELCR(irq_trigger);
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return 0;
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}
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2005-04-16 16:25:24 -06:00
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static int i8259A_suspend(struct sys_device *dev, pm_message_t state)
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2005-04-16 16:20:36 -06:00
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{
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save_ELCR(irq_trigger);
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return 0;
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}
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2005-06-25 15:57:43 -06:00
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static int i8259A_shutdown(struct sys_device *dev)
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{
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/* Put the i8259A into a quiescent state that
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* the kernel initialization code can get it
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* out of.
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*/
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2006-06-23 03:04:28 -06:00
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outb(0xff, PIC_MASTER_IMR); /* mask all of 8259A-1 */
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outb(0xff, PIC_SLAVE_IMR); /* mask all of 8259A-1 */
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2005-06-25 15:57:43 -06:00
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return 0;
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}
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2005-04-16 16:20:36 -06:00
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static struct sysdev_class i8259_sysdev_class = {
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set_kset_name("i8259"),
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.suspend = i8259A_suspend,
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.resume = i8259A_resume,
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2005-06-25 15:57:43 -06:00
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.shutdown = i8259A_shutdown,
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2005-04-16 16:20:36 -06:00
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};
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static struct sys_device device_i8259A = {
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.id = 0,
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.cls = &i8259_sysdev_class,
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};
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static int __init i8259A_init_sysfs(void)
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{
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int error = sysdev_class_register(&i8259_sysdev_class);
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if (!error)
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error = sysdev_register(&device_i8259A);
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return error;
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}
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device_initcall(i8259A_init_sysfs);
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void init_8259A(int auto_eoi)
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{
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unsigned long flags;
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2006-09-26 02:52:41 -06:00
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i8259A_auto_eoi = auto_eoi;
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2005-04-16 16:20:36 -06:00
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spin_lock_irqsave(&i8259A_lock, flags);
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outb(0xff, PIC_MASTER_IMR); /* mask all of 8259A-1 */
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outb(0xff, PIC_SLAVE_IMR); /* mask all of 8259A-2 */
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/*
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* outb_p - this has to work on a wide range of PC hardware.
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*/
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outb_p(0x11, PIC_MASTER_CMD); /* ICW1: select 8259A-1 init */
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outb_p(0x20 + 0, PIC_MASTER_IMR); /* ICW2: 8259A-1 IR0-7 mapped to 0x20-0x27 */
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outb_p(1U << PIC_CASCADE_IR, PIC_MASTER_IMR); /* 8259A-1 (the master) has a slave on IR2 */
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if (auto_eoi) /* master does Auto EOI */
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outb_p(MASTER_ICW4_DEFAULT | PIC_ICW4_AEOI, PIC_MASTER_IMR);
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else /* master expects normal EOI */
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outb_p(MASTER_ICW4_DEFAULT, PIC_MASTER_IMR);
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outb_p(0x11, PIC_SLAVE_CMD); /* ICW1: select 8259A-2 init */
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outb_p(0x20 + 8, PIC_SLAVE_IMR); /* ICW2: 8259A-2 IR0-7 mapped to 0x28-0x2f */
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outb_p(PIC_CASCADE_IR, PIC_SLAVE_IMR); /* 8259A-2 is a slave on master's IR2 */
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outb_p(SLAVE_ICW4_DEFAULT, PIC_SLAVE_IMR); /* (slave's support for AEOI in flat mode is to be investigated) */
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if (auto_eoi)
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/*
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2006-10-04 03:16:26 -06:00
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* In AEOI mode we just have to mask the interrupt
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2005-04-16 16:20:36 -06:00
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* when acking.
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*/
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2006-10-04 03:16:26 -06:00
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i8259A_chip.mask_ack = disable_8259A_irq;
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2005-04-16 16:20:36 -06:00
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else
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2006-10-04 03:16:26 -06:00
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i8259A_chip.mask_ack = mask_and_ack_8259A;
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2005-04-16 16:20:36 -06:00
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udelay(100); /* wait for 8259A to initialize */
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outb(cached_master_mask, PIC_MASTER_IMR); /* restore master IRQ mask */
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outb(cached_slave_mask, PIC_SLAVE_IMR); /* restore slave IRQ mask */
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spin_unlock_irqrestore(&i8259A_lock, flags);
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}
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/*
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* Note that on a 486, we don't want to do a SIGFPE on an irq13
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* as the irq is unreliable, and exception 16 works correctly
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* (ie as explained in the intel literature). On a 386, you
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* can't use exception 16 due to bad IBM design, so we have to
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* rely on the less exact irq13.
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*
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* Careful.. Not only is IRQ13 unreliable, but it is also
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* leads to races. IBM designers who came up with it should
|
|
|
|
* be shot.
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 07:55:46 -06:00
|
|
|
static irqreturn_t math_error_irq(int cpl, void *dev_id)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
extern void math_error(void __user *);
|
|
|
|
outb(0,0xF0);
|
|
|
|
if (ignore_fpu_irq || !boot_cpu_data.hard_math)
|
|
|
|
return IRQ_NONE;
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 07:55:46 -06:00
|
|
|
math_error((void __user *)get_irq_regs()->eip);
|
2005-04-16 16:20:36 -06:00
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* New motherboards sometimes make IRQ 13 be a PCI interrupt,
|
|
|
|
* so allow interrupt sharing.
|
|
|
|
*/
|
2007-10-17 10:04:36 -06:00
|
|
|
static struct irqaction fpu_irq = {
|
|
|
|
.handler = math_error_irq,
|
|
|
|
.mask = CPU_MASK_NONE,
|
|
|
|
.name = "fpu",
|
|
|
|
};
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
void __init init_ISA_irqs (void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
|
|
init_bsp_APIC();
|
|
|
|
#endif
|
|
|
|
init_8259A(0);
|
|
|
|
|
|
|
|
for (i = 0; i < NR_IRQS; i++) {
|
|
|
|
irq_desc[i].status = IRQ_DISABLED;
|
|
|
|
irq_desc[i].action = NULL;
|
|
|
|
irq_desc[i].depth = 1;
|
|
|
|
|
|
|
|
if (i < 16) {
|
|
|
|
/*
|
|
|
|
* 16 old-style INTA-cycle interrupts:
|
|
|
|
*/
|
2006-10-17 01:10:03 -06:00
|
|
|
set_irq_chip_and_handler_name(i, &i8259A_chip,
|
|
|
|
handle_level_irq, "XT");
|
2005-04-16 16:20:36 -06:00
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* 'high' PCI IRQs filled in on demand
|
|
|
|
*/
|
2006-10-04 03:16:26 -06:00
|
|
|
irq_desc[i].chip = &no_irq_chip;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-12-06 18:14:07 -07:00
|
|
|
/* Overridden in paravirt.c */
|
|
|
|
void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
|
|
|
|
|
|
|
|
void __init native_init_IRQ(void)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
/* all the set up before the call gates are initialised */
|
|
|
|
pre_intr_init_hook();
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Cover the whole vector space, no vector can escape
|
|
|
|
* us. (some of these will be overridden and become
|
|
|
|
* 'special' SMP interrupts)
|
|
|
|
*/
|
|
|
|
for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
|
|
|
|
int vector = FIRST_EXTERNAL_VECTOR + i;
|
|
|
|
if (i >= NR_IRQS)
|
|
|
|
break;
|
|
|
|
if (vector != SYSCALL_VECTOR)
|
|
|
|
set_intr_gate(vector, interrupt[i]);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* setup after call gates are initialised (usually add in
|
|
|
|
* the architecture specific gates)
|
|
|
|
*/
|
|
|
|
intr_init_hook();
|
|
|
|
|
|
|
|
/*
|
|
|
|
* External FPU? Set up irq13 if so, for
|
|
|
|
* original braindamaged IBM FERR coupling.
|
|
|
|
*/
|
|
|
|
if (boot_cpu_data.hard_math && !cpu_has_fpu)
|
|
|
|
setup_irq(FPU_IRQ, &fpu_irq);
|
|
|
|
|
|
|
|
irq_ctx_init(smp_processor_id());
|
|
|
|
}
|