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#ifndef _ASM_HW_IRQ_H

#define _ASM_HW_IRQ_H

/*

 *      linux/include/asm/hw_irq.h

 *

 *      (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar

 *

 *      moved some of the old arch/i386/kernel/irq.h to here. VY

 *

 *      IRQ/IPI changes taken from work by Thomas Radke

 *      <tomsoft@informatik.tu-chemnitz.de>

 */

#include <linux/config.h>

#include <asm/atomic.h>

#include <asm/irq.h>

/*

 * IDT vectors usable for external interrupt sources start

 * at 0x20:

 */

#define FIRST_EXTERNAL_VECTOR   0x20

#define SYSCALL_VECTOR          0x80

/*

 * Vectors 0x20-0x2f are used for ISA interrupts.

 */

/*

 * Special IRQ vectors used by the SMP architecture, 0xf0-0xff

 *

 *  some of the following vectors are 'rare', they are merged

 *  into a single vector (CALL_FUNCTION_VECTOR) to save vector space.

 *  TLB, reschedule and local APIC vectors are performance-critical.

 *

 *  Vectors 0xf0-0xfa are free (reserved for future Linux use).

 */

#define SPURIOUS_APIC_VECTOR    0xff

#define ERROR_APIC_VECTOR       0xfe

#define INVALIDATE_TLB_VECTOR   0xfd

#define RESCHEDULE_VECTOR       0xfc

#define CALL_FUNCTION_VECTOR    0xfb

/*

 * Local APIC timer IRQ vector is on a different priority level,

 * to work around the 'lost local interrupt if more than 2 IRQ

 * sources per level' errata.

 */

#define LOCAL_TIMER_VECTOR      0xef

/*

 * First APIC vector available to drivers: (vectors 0x30-0xee)

 * we start at 0x31 to spread out vectors evenly between priority

 * levels. (0x80 is the syscall vector)

 */

#define FIRST_DEVICE_VECTOR     0x31

#define FIRST_SYSTEM_VECTOR     0xef

extern int irq_vector[NR_IRQS];

#define IO_APIC_VECTOR(irq)     irq_vector[irq]

/*

 * Various low-level irq details needed by irq.c, process.c,

 * time.c, io_apic.c and smp.c

 *

 * Interrupt entry/exit code at both C and assembly level

 */

extern void mask_irq(unsigned int irq);

extern void unmask_irq(unsigned int irq);

extern void disable_8259A_irq(unsigned int irq);

extern void enable_8259A_irq(unsigned int irq);

extern int i8259A_irq_pending(unsigned int irq);

extern void make_8259A_irq(unsigned int irq);

extern void init_8259A(int aeoi);

extern void FASTCALL(send_IPI_self(int vector));

extern void init_VISWS_APIC_irqs(void);

extern void setup_IO_APIC(void);

extern void disable_IO_APIC(void);

extern void print_IO_APIC(void);

extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);

extern void send_IPI(int dest, int vector);

extern unsigned long io_apic_irqs;

extern atomic_t irq_err_count;

extern atomic_t irq_mis_count;

extern char _stext, _etext;

#define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs))

#define __STR(x) #x

#define STR(x) __STR(x)

#define SAVE_ALL \

        "cld\n\t" \

        "pushl %es\n\t" \

        "pushl %ds\n\t" \

        "pushl %eax\n\t" \

        "pushl %ebp\n\t" \

        "pushl %edi\n\t" \

        "pushl %esi\n\t" \

        "pushl %edx\n\t" \

        "pushl %ecx\n\t" \

        "pushl %ebx\n\t" \

        "movl $" STR(__KERNEL_DS) ",%edx\n\t" \

        "movl %edx,%ds\n\t" \

        "movl %edx,%es\n\t"

#define IRQ_NAME2(nr) nr##_interrupt(void)

#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)

#define GET_CURRENT \

        "movl %esp, %ebx\n\t" \

        "andl $-8192, %ebx\n\t"

/*

 *      SMP has a few special interrupts for IPI messages

 */

        /* there is a second layer of macro just to get the symbolic

           name for the vector evaluated. This change is for RTLinux */

#define BUILD_SMP_INTERRUPT(x,v) XBUILD_SMP_INTERRUPT(x,v)

#define XBUILD_SMP_INTERRUPT(x,v)\

asmlinkage void x(void); \

asmlinkage void call_##x(void); \

__asm__( \

"\n"__ALIGN_STR"\n" \

SYMBOL_NAME_STR(x) ":\n\t" \

        "pushl $"#v"-256\n\t" \

        SAVE_ALL \

        SYMBOL_NAME_STR(call_##x)":\n\t" \

        "call "SYMBOL_NAME_STR(smp_##x)"\n\t" \

        "jmp ret_from_intr\n");

#define BUILD_SMP_TIMER_INTERRUPT(x,v) XBUILD_SMP_TIMER_INTERRUPT(x,v)

#define XBUILD_SMP_TIMER_INTERRUPT(x,v) \

asmlinkage void x(struct pt_regs * regs); \

asmlinkage void call_##x(void); \

__asm__( \

"\n"__ALIGN_STR"\n" \

SYMBOL_NAME_STR(x) ":\n\t" \

        "pushl $"#v"-256\n\t" \

        SAVE_ALL \

        "movl %esp,%eax\n\t" \

        "pushl %eax\n\t" \

        SYMBOL_NAME_STR(call_##x)":\n\t" \

        "call "SYMBOL_NAME_STR(smp_##x)"\n\t" \

        "addl $4,%esp\n\t" \

        "jmp ret_from_intr\n");

#define BUILD_COMMON_IRQ() \

asmlinkage void call_do_IRQ(void); \

__asm__( \

        "\n" __ALIGN_STR"\n" \

        "common_interrupt:\n\t" \

        SAVE_ALL \

        SYMBOL_NAME_STR(call_do_IRQ)":\n\t" \

        "call " SYMBOL_NAME_STR(do_IRQ) "\n\t" \

        "jmp ret_from_intr\n");

/*

 * subtle. orig_eax is used by the signal code to distinct between

 * system calls and interrupted 'random user-space'. Thus we have

 * to put a negative value into orig_eax here. (the problem is that

 * both system calls and IRQs want to have small integer numbers in

 * orig_eax, and the syscall code has won the optimization conflict ;)

 *

 * Subtle as a pigs ear.  VY

 */

#define BUILD_IRQ(nr) \

asmlinkage void IRQ_NAME(nr); \

__asm__( \

"\n"__ALIGN_STR"\n" \

SYMBOL_NAME_STR(IRQ) #nr "_interrupt:\n\t" \

        "pushl $"#nr"-256\n\t" \

        "jmp common_interrupt");

extern unsigned long prof_cpu_mask;

extern unsigned int * prof_buffer;

extern unsigned long prof_len;

extern unsigned long prof_shift;

/*

 * x86 profiling function, SMP safe. We might want to do this in

 * assembly totally?

 */

static inline void x86_do_profile (unsigned long eip)

{

        if (!prof_buffer)

                return;

        /*

         * Only measure the CPUs specified by /proc/irq/prof_cpu_mask.

         * (default is all CPUs.)

         */

        if (!((1<<smp_processor_id()) & prof_cpu_mask))

                return;

        eip -= (unsigned long) &_stext;

        eip >>= prof_shift;

        /*

         * Don't ignore out-of-bounds EIP values silently,

         * put them into the last histogram slot, so if

         * present, they will show up as a sharp peak.

         */

        if (eip > prof_len-1)

                eip = prof_len-1;

        atomic_inc((atomic_t *)&prof_buffer[eip]);

}

#if defined(CONFIG_X86_IO_APIC)

static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {

        if (IO_APIC_IRQ(i))

                send_IPI_self(IO_APIC_VECTOR(i));

}

#else

static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {}

#endif

#endif /* _ASM_HW_IRQ_H */