i386: prepare shared kernel/irq.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 343 deletions

diff --git a/arch/i386/kernel/irq.c b/arch/i386/kernel/irq.c
deleted file mode 100644
index dd2b97fc00b2..000000000000
--- a/arch/i386/kernel/irq.c
+++ /dev/null
@@ -1,343 +0,0 @@
-/*
- *      linux/arch/i386/kernel/irq.c
- *
- *      Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
- *
- * This file contains the lowest level x86-specific interrupt
- * entry, irq-stacks and irq statistics code. All the remaining
- * irq logic is done by the generic kernel/irq/ code and
- * by the x86-specific irq controller code. (e.g. i8259.c and
- * io_apic.c.)
- */
-
-#include <linux/module.h>
-#include <linux/seq_file.h>
-#include <linux/interrupt.h>
-#include <linux/kernel_stat.h>
-#include <linux/notifier.h>
-#include <linux/cpu.h>
-#include <linux/delay.h>
-
-#include <asm/apic.h>
-#include <asm/uaccess.h>
-
-DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
-EXPORT_PER_CPU_SYMBOL(irq_stat);
-
-DEFINE_PER_CPU(struct pt_regs *, irq_regs);
-EXPORT_PER_CPU_SYMBOL(irq_regs);
-
-/*
- * 'what should we do if we get a hw irq event on an illegal vector'.
- * each architecture has to answer this themselves.
- */
-void ack_bad_irq(unsigned int irq)
-{
-        printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq);
-
-#ifdef CONFIG_X86_LOCAL_APIC
-        /*
-         * Currently unexpected vectors happen only on SMP and APIC.
-         * We _must_ ack these because every local APIC has only N
-         * irq slots per priority level, and a 'hanging, unacked' IRQ
-         * holds up an irq slot - in excessive cases (when multiple
-         * unexpected vectors occur) that might lock up the APIC
-         * completely.
-         * But only ack when the APIC is enabled -AK
-         */
-        if (cpu_has_apic)
-                ack_APIC_irq();
-#endif
-}
-
-#ifdef CONFIG_4KSTACKS
-/*
- * per-CPU IRQ handling contexts (thread information and stack)
- */
-union irq_ctx {
-        struct thread_info      tinfo;
-        u32                     stack[THREAD_SIZE/sizeof(u32)];
-};
-
-static union irq_ctx *hardirq_ctx[NR_CPUS] __read_mostly;
-static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly;
-#endif
-
-/*
- * do_IRQ handles all normal device IRQ's (the special
- * SMP cross-CPU interrupts have their own specific
- * handlers).
- */
-fastcall unsigned int do_IRQ(struct pt_regs *regs)
-{       
-        struct pt_regs *old_regs;
-        /* high bit used in ret_from_ code */
-        int irq = ~regs->orig_eax;
-        struct irq_desc *desc = irq_desc + irq;
-#ifdef CONFIG_4KSTACKS
-        union irq_ctx *curctx, *irqctx;
-        u32 *isp;
-#endif
-
-        if (unlikely((unsigned)irq >= NR_IRQS)) {
-                printk(KERN_EMERG "%s: cannot handle IRQ %d\n",
-                                        __FUNCTION__, irq);
-                BUG();
-        }
-
-        old_regs = set_irq_regs(regs);
-        irq_enter();
-#ifdef CONFIG_DEBUG_STACKOVERFLOW
-        /* Debugging check for stack overflow: is there less than 1KB free? */
-        {
-                long esp;
-
-                __asm__ __volatile__("andl %%esp,%0" :
-                                        "=r" (esp) : "0" (THREAD_SIZE - 1));
-                if (unlikely(esp < (sizeof(struct thread_info) + STACK_WARN))) {
-                        printk("do_IRQ: stack overflow: %ld\n",
-                                esp - sizeof(struct thread_info));
-                        dump_stack();
-                }
-        }
-#endif
-
-#ifdef CONFIG_4KSTACKS
-
-        curctx = (union irq_ctx *) current_thread_info();
-        irqctx = hardirq_ctx[smp_processor_id()];
-
-        /*
-         * this is where we switch to the IRQ stack. However, if we are
-         * already using the IRQ stack (because we interrupted a hardirq
-         * handler) we can't do that and just have to keep using the
-         * current stack (which is the irq stack already after all)
-         */
-        if (curctx != irqctx) {
-                int arg1, arg2, ebx;
-
-                /* build the stack frame on the IRQ stack */
-                isp = (u32*) ((char*)irqctx + sizeof(*irqctx));
-                irqctx->tinfo.task = curctx->tinfo.task;
-                irqctx->tinfo.previous_esp = current_stack_pointer;
-
-                /*
-                 * Copy the softirq bits in preempt_count so that the
-                 * softirq checks work in the hardirq context.
-                 */
-                irqctx->tinfo.preempt_count =
-                        (irqctx->tinfo.preempt_count & ~SOFTIRQ_MASK) |
-                        (curctx->tinfo.preempt_count & SOFTIRQ_MASK);
-
-                asm volatile(
-                        "       xchgl  %%ebx,%%esp      \n"
-                        "       call   *%%edi           \n"
-                        "       movl   %%ebx,%%esp      \n"
-                        : "=a" (arg1), "=d" (arg2), "=b" (ebx)
-                        :  "0" (irq),   "1" (desc),  "2" (isp),
-                           "D" (desc->handle_irq)
-                        : "memory", "cc"
-                );
-        } else
-#endif
-                desc->handle_irq(irq, desc);
-
-        irq_exit();
-        set_irq_regs(old_regs);
-        return 1;
-}
-
-#ifdef CONFIG_4KSTACKS
-
-static char softirq_stack[NR_CPUS * THREAD_SIZE]
-                __attribute__((__section__(".bss.page_aligned")));
-
-static char hardirq_stack[NR_CPUS * THREAD_SIZE]
-                __attribute__((__section__(".bss.page_aligned")));
-
-/*
- * allocate per-cpu stacks for hardirq and for softirq processing
- */
-void irq_ctx_init(int cpu)
-{
-        union irq_ctx *irqctx;
-
-        if (hardirq_ctx[cpu])
-                return;
-
-        irqctx = (union irq_ctx*) &hardirq_stack[cpu*THREAD_SIZE];
-        irqctx->tinfo.task              = NULL;
-        irqctx->tinfo.exec_domain       = NULL;
-        irqctx->tinfo.cpu               = cpu;
-        irqctx->tinfo.preempt_count     = HARDIRQ_OFFSET;
-        irqctx->tinfo.addr_limit        = MAKE_MM_SEG(0);
-
-        hardirq_ctx[cpu] = irqctx;
-
-        irqctx = (union irq_ctx*) &softirq_stack[cpu*THREAD_SIZE];
-        irqctx->tinfo.task              = NULL;
-        irqctx->tinfo.exec_domain       = NULL;
-        irqctx->tinfo.cpu               = cpu;
-        irqctx->tinfo.preempt_count     = 0;
-        irqctx->tinfo.addr_limit        = MAKE_MM_SEG(0);
-
-        softirq_ctx[cpu] = irqctx;
-
-        printk("CPU %u irqstacks, hard=%p soft=%p\n",
-                cpu,hardirq_ctx[cpu],softirq_ctx[cpu]);
-}
-
-void irq_ctx_exit(int cpu)
-{
-        hardirq_ctx[cpu] = NULL;
-}
-
-extern asmlinkage void __do_softirq(void);
-
-asmlinkage void do_softirq(void)
-{
-        unsigned long flags;
-        struct thread_info *curctx;
-        union irq_ctx *irqctx;
-        u32 *isp;
-
-        if (in_interrupt())
-                return;
-
-        local_irq_save(flags);
-
-        if (local_softirq_pending()) {
-                curctx = current_thread_info();
-                irqctx = softirq_ctx[smp_processor_id()];
-                irqctx->tinfo.task = curctx->task;
-                irqctx->tinfo.previous_esp = current_stack_pointer;
-
-                /* build the stack frame on the softirq stack */
-                isp = (u32*) ((char*)irqctx + sizeof(*irqctx));
-
-                asm volatile(
-                        "       xchgl   %%ebx,%%esp     \n"
-                        "       call    __do_softirq    \n"
-                        "       movl    %%ebx,%%esp     \n"
-                        : "=b"(isp)
-                        : "0"(isp)
-                        : "memory", "cc", "edx", "ecx", "eax"
-                );
-                /*
-                 * Shouldnt happen, we returned above if in_interrupt():
-                 */
-                WARN_ON_ONCE(softirq_count());
-        }
-
-        local_irq_restore(flags);
-}
-
-EXPORT_SYMBOL(do_softirq);
-#endif
-
-/*
- * Interrupt statistics:
- */
-
-atomic_t irq_err_count;
-
-/*
- * /proc/interrupts printing:
- */
-
-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%-8d",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, " %8s", irq_desc[i].chip->name);
-                seq_printf(p, "-%-8s", irq_desc[i].name);
-                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_printf(p, "NMI: ");
-                for_each_online_cpu(j)
-                        seq_printf(p, "%10u ", nmi_count(j));
-                seq_putc(p, '\n');
-#ifdef CONFIG_X86_LOCAL_APIC
-                seq_printf(p, "LOC: ");
-                for_each_online_cpu(j)
-                        seq_printf(p, "%10u ",
-                                per_cpu(irq_stat,j).apic_timer_irqs);
-                seq_putc(p, '\n');
-#endif
-                seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
-#if defined(CONFIG_X86_IO_APIC)
-                seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
-#endif
-        }
-        return 0;
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-#include <mach_apic.h>
-
-void fixup_irqs(cpumask_t map)
-{
-        unsigned int irq;
-        static int warned;
-
-        for (irq = 0; irq < NR_IRQS; irq++) {
-                cpumask_t mask;
-                if (irq == 2)
-                        continue;
-
-                cpus_and(mask, irq_desc[irq].affinity, map);
-                if (any_online_cpu(mask) == NR_CPUS) {
-                        printk("Breaking affinity for irq %i\n", irq);
-                        mask = map;
-                }
-                if (irq_desc[irq].chip->set_affinity)
-                        irq_desc[irq].chip->set_affinity(irq, mask);
-                else if (irq_desc[irq].action && !(warned++))
-                        printk("Cannot set affinity for irq %i\n", irq);
-        }
-
-#if 0
-        barrier();
-        /* Ingo Molnar says: "after the IO-APIC masks have been redirected
-           [note the nop - the interrupt-enable boundary on x86 is two
-           instructions from sti] - to flush out pending hardirqs and
-           IPIs. After this point nothing is supposed to reach this CPU." */
-        __asm__ __volatile__("sti; nop; cli");
-        barrier();
-#else
-        /* That doesn't seem sufficient.  Give it 1ms. */
-        local_irq_enable();
-        mdelay(1);
-        local_irq_disable();
-#endif
-}
-#endif
-