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
  17 #ifndef __ASSEMBLY__
  18 #include <asm/atomic.h>
  19 #include <asm/irq.h>
  20 #include <linux/profile.h>
  21 #include <linux/smp.h>
  22
  23 struct hw_interrupt_type;
  24 #endif
  25
  26 #define NMI_VECTOR              0x02
  27 /*
  28  * IDT vectors usable for external interrupt sources start
  29  * at 0x20:
  30  */
  31 #define FIRST_EXTERNAL_VECTOR   0x20
  32
  33 #define IA32_SYSCALL_VECTOR     0x80
  34
  35
  36 /*
  37  * Vectors 0x20-0x2f are used for ISA interrupts.
  38  */
  39
  40 /*
  41  * Special IRQ vectors used by the SMP architecture, 0xf0-0xff
  42  *
  43  *  some of the following vectors are 'rare', they are merged
  44  *  into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
  45  *  TLB, reschedule and local APIC vectors are performance-critical.
  46  */
  47 #define SPURIOUS_APIC_VECTOR    0xff
  48 #define ERROR_APIC_VECTOR       0xfe
  49 #define RESCHEDULE_VECTOR       0xfd
  50 #define CALL_FUNCTION_VECTOR    0xfc
  51 /* fb free - please don't readd KDB here because it's useless
  52    (hint - think what a NMI bit does to a vector) */
  53 #define THERMAL_APIC_VECTOR     0xfa
  54 #define THRESHOLD_APIC_VECTOR   0xf9
  55 /* f8 free */
  56 #define INVALIDATE_TLB_VECTOR_END       0xf7
  57 #define INVALIDATE_TLB_VECTOR_START     0xf0    /* f0-f7 used for TLB flush */
  58
  59 #define NUM_INVALIDATE_TLB_VECTORS      8
  60
  61 /*
  62  * Local APIC timer IRQ vector is on a different priority level,
  63  * to work around the 'lost local interrupt if more than 2 IRQ
  64  * sources per level' errata.
  65  */
  66 #define LOCAL_TIMER_VECTOR      0xef
  67
  68 /*
  69  * First APIC vector available to drivers: (vectors 0x30-0xee)
  70  * we start at 0x31 to spread out vectors evenly between priority
  71  * levels. (0x80 is the syscall vector)
  72  */
  73 #define FIRST_DEVICE_VECTOR     0x31
  74 #define FIRST_SYSTEM_VECTOR     0xef   /* duplicated in irq.h */
  75
  76
  77 #ifndef __ASSEMBLY__
  78 extern u8 irq_vector[NR_IRQ_VECTORS];
  79 #define IO_APIC_VECTOR(irq)     (irq_vector[irq])
  80 #define AUTO_ASSIGN             -1
  81
  82 /*
  83  * Various low-level irq details needed by irq.c, process.c,
  84  * time.c, io_apic.c and smp.c
  85  *
  86  * Interrupt entry/exit code at both C and assembly level
  87  */
  88
  89 extern void disable_8259A_irq(unsigned int irq);
  90 extern void enable_8259A_irq(unsigned int irq);
  91 extern int i8259A_irq_pending(unsigned int irq);
  92 extern void make_8259A_irq(unsigned int irq);
  93 extern void init_8259A(int aeoi);
  94 extern void FASTCALL(send_IPI_self(int vector));
  95 extern void init_VISWS_APIC_irqs(void);
  96 extern void setup_IO_APIC(void);
  97 extern void disable_IO_APIC(void);
  98 extern void print_IO_APIC(void);
  99 extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);
 100 extern void send_IPI(int dest, int vector);
 101 extern void setup_ioapic_dest(void);
 102
 103 extern unsigned long io_apic_irqs;
 104
 105 extern atomic_t irq_err_count;
 106 extern atomic_t irq_mis_count;
 107
 108 #define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs))
 109
 110 #define __STR(x) #x
 111 #define STR(x) __STR(x)
 112
 113 #include <asm/ptrace.h>
 114
 115 #define IRQ_NAME2(nr) nr##_interrupt(void)
 116 #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
 117
 118 /*
 119  *      SMP has a few special interrupts for IPI messages
 120  */
 121
 122 #define BUILD_IRQ(nr) \
 123 asmlinkage void IRQ_NAME(nr); \
 124 __asm__( \
 125 "\n.p2align\n" \
 126 "IRQ" #nr "_interrupt:\n\t" \
 127         "push $~(" #nr ") ; " \
 128         "jmp common_interrupt");
 129
 130 #if defined(CONFIG_X86_IO_APIC)
 131 static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {
 132         if (IO_APIC_IRQ(i))
 133                 send_IPI_self(IO_APIC_VECTOR(i));
 134 }
 135 #else
 136 static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {}
 137 #endif
 138
 139 #define platform_legacy_irq(irq)        ((irq) < 16)
 140
 141 #endif
 142
 143 #endif /* _ASM_HW_IRQ_H */