/*
 *      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);

#ifdef CONFIG_DEBUG_STACKOVERFLOW
/* Debugging check for stack overflow: is there less than 1KB free? */
static int check_stack_overflow(void)
{
        long sp;

        __asm__ __volatile__("andl %%esp,%0" :
                             "=r" (sp) : "0" (THREAD_SIZE - 1));

        return sp < (sizeof(struct thread_info) + STACK_WARN);
}

static void print_stack_overflow(void)
{
        printk(KERN_WARNING "low stack detected by irq handler\n");
        dump_stack();
}

#else
static inline int check_stack_overflow(void) { return 0; }
static inline void print_stack_overflow(void) { }
#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;

static char softirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
static char hardirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;

static void call_on_stack(void *func, void *stack)
{
        asm volatile("xchgl     %%ebx,%%esp     \n"
                     "call      *%%edi          \n"
                     "movl      %%ebx,%%esp     \n"
                     : "=b" (stack)
                     : "0" (stack),
                       "D"(func)
                     : "memory", "cc", "edx", "ecx", "eax");
}

static inline int
execute_on_irq_stack(int overflow, struct irq_desc *desc, int irq)
{
        union irq_ctx *curctx, *irqctx;
        u32 *isp, arg1, arg2;

        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 (unlikely(curctx == irqctx))
                return 0;

        /* 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);

        if (unlikely(overflow))
                call_on_stack(print_stack_overflow, isp);

        asm volatile("xchgl     %%ebx,%%esp     \n"
                     "call      *%%edi          \n"
                     "movl      %%ebx,%%esp     \n"
                     : "=a" (arg1), "=d" (arg2), "=b" (isp)
                     :  "0" (irq),   "1" (desc),  "2" (isp),
                        "D" (desc->handle_irq)
                     : "memory", "cc", "ecx");
        return 1;
}

/*
 * allocate per-cpu stacks for hardirq and for softirq processing
 */
void __cpuinit 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(KERN_DEBUG "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;
}

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));

                call_on_stack(__do_softirq, isp);
                /*
                 * Shouldnt happen, we returned above if in_interrupt():
                 */
                WARN_ON_ONCE(softirq_count());
        }

        local_irq_restore(flags);
}

#else
static inline int
execute_on_irq_stack(int overflow, struct irq_desc *desc, int irq) { return 0; }
#endif

/*
 * do_IRQ handles all normal device IRQ's (the special
 * SMP cross-CPU interrupts have their own specific
 * handlers).
 */
unsigned int do_IRQ(struct pt_regs *regs)
{
        struct pt_regs *old_regs;
        /* high bit used in ret_from_ code */
        int overflow;
        unsigned vector = ~regs->orig_ax;
        struct irq_desc *desc;
        unsigned irq;


        old_regs = set_irq_regs(regs);
        irq_enter();
        irq = __get_cpu_var(vector_irq)[vector];

        overflow = check_stack_overflow();

        desc = irq_to_desc(irq);
        if (unlikely(!desc)) {
                printk(KERN_EMERG "%s: cannot handle IRQ %d vector %#x cpu %d\n",
                                        __func__, irq, vector, smp_processor_id());
                BUG();
        }

        if (!execute_on_irq_stack(overflow, desc, irq)) {
                if (unlikely(overflow))
                        print_stack_overflow();
                desc->handle_irq(irq, desc);
        }

        irq_exit();
        set_irq_regs(old_regs);
        return 1;
}

#ifdef CONFIG_HOTPLUG_CPU
#include <mach_apic.h>

void fixup_irqs(cpumask_t map)
{
        unsigned int irq;
        static int warned;
        struct irq_desc *desc;

        for_each_irq_desc(irq, desc) {
                cpumask_t mask;

                if (irq == 2)
                        continue;

                cpus_and(mask, desc->affinity, map);
                if (any_online_cpu(mask) == NR_CPUS) {
                        printk("Breaking affinity for irq %i\n", irq);
                        mask = map;
                }
                if (desc->chip->set_affinity)
                        desc->chip->set_affinity(irq, mask);
                else if (desc->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