include/asm-x86_64/hw_irq.h

   1 #ifndef _ASM_HW_IRQ_H
   2 #define _ASM_HW_IRQ_H
   3
   4 /*
   5  *      linux/include/asm/hw_irq.h
   6  *
   7  *      (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
   8  *
   9  *      moved some of the old arch/i386/kernel/irq.h to here. VY
  10  *
  11  *      IRQ/IPI changes taken from work by Thomas Radke
  12  *      <tomsoft@informatik.tu-chemnitz.de>
  13  *
  14  *      hacked by Andi Kleen for x86-64.
  15  *
  16  *  $Id: hw_irq.h,v 1.24 2001/09/14 20:55:03 vojtech Exp $
  17  */
  18
  19 #ifndef __ASSEMBLY__
  20 #include <linux/config.h>
  21 #include <asm/atomic.h>
  22 #include <asm/irq.h>
  23 #include <linux/profile.h>
  24 #include <linux/smp.h>
  25
  26 struct hw_interrupt_type;
  27 #endif
  28
  29 /*
  30  * IDT vectors usable for external interrupt sources start
  31  * at 0x20:
  32  */
  33 #define FIRST_EXTERNAL_VECTOR   0x20
  34
  35 #define IA32_SYSCALL_VECTOR     0x80
  36
  37
  38 /*
  39  * Vectors 0x20-0x2f are used for ISA interrupts.
  40  */
  41
  42 /*
  43  * Special IRQ vectors used by the SMP architecture, 0xf0-0xff
  44  *
  45  *  some of the following vectors are 'rare', they are merged
  46  *  into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
  47  *  TLB, reschedule and local APIC vectors are performance-critical.
  48  *
  49  *  Vectors 0xf0-0xf9 are free (reserved for future Linux use).
  50  */
  51 #define SPURIOUS_APIC_VECTOR    0xff
  52 #define ERROR_APIC_VECTOR       0xfe
  53 #define INVALIDATE_TLB_VECTOR   0xfd
  54 #define RESCHEDULE_VECTOR       0xfc
  55 #define TASK_MIGRATION_VECTOR   0xfb
  56 #define CALL_FUNCTION_VECTOR    0xfa
  57 #define KDB_VECTOR      0xf9
  58
  59 #define THERMAL_APIC_VECTOR     0xf0
  60
  61
  62 /*
  63  * Local APIC timer IRQ vector is on a different priority level,
  64  * to work around the 'lost local interrupt if more than 2 IRQ
  65  * sources per level' errata.
  66  */
  67 #define LOCAL_TIMER_VECTOR      0xef
  68
  69 /*
  70  * First APIC vector available to drivers: (vectors 0x30-0xee)
  71  * we start at 0x31 to spread out vectors evenly between priority
  72  * levels. (0x80 is the syscall vector)
  73  */
  74 #define FIRST_DEVICE_VECTOR     0x31
  75 #define FIRST_SYSTEM_VECTOR     0xef   /* duplicated in irq.h */
  76
  77
  78 #ifndef __ASSEMBLY__
  79 extern u8 irq_vector[NR_IRQ_VECTORS];
  80 #define IO_APIC_VECTOR(irq)     (irq_vector[irq])
  81 #define AUTO_ASSIGN             -1
  82
  83 /*
  84  * Various low-level irq details needed by irq.c, process.c,
  85  * time.c, io_apic.c and smp.c
  86  *
  87  * Interrupt entry/exit code at both C and assembly level
  88  */
  89
  90 extern void mask_irq(unsigned int irq);
  91 extern void unmask_irq(unsigned int irq);
  92 extern void disable_8259A_irq(unsigned int irq);
  93 extern void enable_8259A_irq(unsigned int irq);
  94 extern int i8259A_irq_pending(unsigned int irq);
  95 extern void make_8259A_irq(unsigned int irq);
  96 extern void init_8259A(int aeoi);
  97 extern void FASTCALL(send_IPI_self(int vector));
  98 extern void init_VISWS_APIC_irqs(void);
  99 extern void setup_IO_APIC(void);
 100 extern void disable_IO_APIC(void);
 101 extern void print_IO_APIC(void);
 102 extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);
 103 extern void send_IPI(int dest, int vector);
 104 extern void setup_ioapic_dest(void);
 105
 106 extern unsigned long io_apic_irqs;
 107
 108 extern atomic_t irq_err_count;
 109 extern atomic_t irq_mis_count;
 110
 111 #define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs))
 112
 113 #define __STR(x) #x
 114 #define STR(x) __STR(x)
 115
 116 #include <asm/ptrace.h>
 117
 118 #define IRQ_NAME2(nr) nr##_interrupt(void)
 119 #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
 120
 121 /*
 122  *      SMP has a few special interrupts for IPI messages
 123  */
 124
 125 #define BUILD_IRQ(nr) \
 126 asmlinkage void IRQ_NAME(nr); \
 127 __asm__( \
 128 "\n.p2align\n" \
 129 "IRQ" #nr "_interrupt:\n\t" \
 130         "push $" #nr "-256 ; " \
 131         "jmp common_interrupt");
 132
 133 #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP)
 134 static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {
 135         if (IO_APIC_IRQ(i))
 136                 send_IPI_self(IO_APIC_VECTOR(i));
 137 }
 138 #else
 139 static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {}
 140 #endif
 141
 142 #define platform_legacy_irq(irq)        ((irq) < 16)
 143
 144 #endif
 145
 146 #endif /* _ASM_HW_IRQ_H */