arch/i386/kernel/irq.h

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 1 #ifndef __irq_h
 2 #define __irq_h
 3
 4 /*
 5  * Various low-level irq details needed by irq.c and smp.c
 6  *
 7  * Interrupt entry/exit code at both C and assembly level
 8  */
 9
 10 #define IO_APIC_GATE_OFFSET 0x51
 11
 12 voidmask_irq(unsigned int irq);
 13 voidunmask_irq(unsigned int irq);
 14 voidenable_IO_APIC_irq(unsigned int irq);
 15 voiddisable_IO_APIC_irq(unsigned int irq);
 16 voidset_8259A_irq_mask(unsigned int irq);
 17 voidack_APIC_irq(void);
 18 voidsetup_IO_APIC(void);
 19 voidinit_IO_APIC_traps(void);
 20 intIO_APIC_get_PCI_irq_vector(int bus,int slot,int fn);
 21 voidmake_8259A_irq(unsigned int irq);
 22
 23 externunsigned int io_apic_irqs;
 24
 25 #define MAX_IRQ_SOURCES 128
 26 #define MAX_MP_BUSSES 32
 27 enum mp_bustype {
 28  MP_BUS_ISA,
 29  MP_BUS_PCI
 30 };
 31 externint mp_bus_id_to_type [MAX_MP_BUSSES];
 32 externint mp_bus_id_to_pci_bus [MAX_MP_BUSSES];
 33 externchar ioapic_OEM_ID [16];
 34 externchar ioapic_Product_ID [16];
 35
 36 extern spinlock_t irq_controller_lock;/*
 37  * Protects both the 8259 and the
 38  * IO-APIC
 39  */
 40
 41 #ifdef __SMP__
 42
 43 #include <asm/atomic.h>
 44
 45 staticinlinevoidirq_enter(int cpu,unsigned int irq)
 46 {
 47 hardirq_enter(cpu);
 48 while(test_bit(0,&global_irq_lock)) {
 49 /* nothing */;
 50 }
 51 }
 52
 53 staticinlinevoidirq_exit(int cpu,unsigned int irq)
 54 {
 55 hardirq_exit(cpu);
 56 release_irqlock(cpu);
 57 }
 58
 59 #define IO_APIC_IRQ(x) ((1<<x) & io_apic_irqs)
 60
 61 #else
 62
 63 #define irq_enter(cpu, irq) (++local_irq_count[cpu])
 64 #define irq_exit(cpu, irq) (--local_irq_count[cpu])
 65
 66 /* Make these no-ops when not using SMP */
 67 #define enable_IO_APIC_irq(x) do { } while (0)
 68 #define disable_IO_APIC_irq(x) do { } while (0)
 69
 70 #define IO_APIC_IRQ(x) (0)
 71
 72 #endif
 73
 74 #define __STR(x) #x
 75 #define STR(x) __STR(x)
 76
 77 #define SAVE_ALL \
 78 "cld\n\t" \
 79 "push %es\n\t" \
 80 "push %ds\n\t" \
 81 "pushl %eax\n\t" \
 82 "pushl %ebp\n\t" \
 83 "pushl %edi\n\t" \
 84 "pushl %esi\n\t" \
 85 "pushl %edx\n\t" \
 86 "pushl %ecx\n\t" \
 87 "pushl %ebx\n\t" \
 88 "movl $" STR(__KERNEL_DS)",%edx\n\t" \
 89 "mov %dx,%ds\n\t" \
 90 "mov %dx,%es\n\t"
 91
 92 #define IRQ_NAME2(nr) nr##_interrupt(void)
 93 #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
 94
 95 #define GET_CURRENT \
 96 "movl %esp, %ebx\n\t" \
 97 "andl $-8192, %ebx\n\t"
 98
 99 #ifdef __SMP__
 100
 101 /*
 102  * SMP has a few special interrupts for IPI messages
 103  */
 104
 105 #define BUILD_SMP_INTERRUPT(x) \
 106 asmlinkage void x(void); \
 107 __asm__( \
 108 "\n"__ALIGN_STR"\n" \
 109 SYMBOL_NAME_STR(x)":\n\t" \
 110 "pushl $-1\n\t" \
 111  SAVE_ALL \
 112 "call "SYMBOL_NAME_STR(smp_##x)"\n\t" \
 113 "jmp ret_from_intr\n");
 114
 115 #define BUILD_SMP_TIMER_INTERRUPT(x) \
 116 asmlinkage void x(struct pt_regs * regs); \
 117 __asm__( \
 118 "\n"__ALIGN_STR"\n" \
 119 SYMBOL_NAME_STR(x)":\n\t" \
 120 "pushl $-1\n\t" \
 121  SAVE_ALL \
 122 "movl %esp,%eax\n\t" \
 123 "pushl %eax\n\t" \
 124 "call "SYMBOL_NAME_STR(smp_##x)"\n\t" \
 125 "addl $4,%esp\n\t" \
 126 "jmp ret_from_intr\n");
 127
 128 #endif/* __SMP__ */
 129
 130 #define BUILD_COMMON_IRQ() \
 131 __asm__( \
 132 "\n" __ALIGN_STR"\n" \
 133 "common_interrupt:\n\t" \
 134  SAVE_ALL \
 135 "pushl $ret_from_intr\n\t" \
 136 "jmp "SYMBOL_NAME_STR(do_IRQ));
 137
 138 #define BUILD_IRQ(nr) \
 139 asmlinkage void IRQ_NAME(nr); \
 140 __asm__( \
 141 "\n"__ALIGN_STR"\n" \
 142 SYMBOL_NAME_STR(IRQ) #nr"_interrupt:\n\t" \
 143 "pushl $"#nr"-256\n\t" \
 144 "jmp common_interrupt");
 145
 146 /*
 147  * x86 profiling function, SMP safe. We might want to do this in
 148  * assembly totally?
 149  */
 150 staticinlinevoidx86_do_profile(unsigned long eip)
 151 {
 152 if(prof_buffer && current->pid) {
 153 externint _stext;
 154  eip -= (unsigned long) &_stext;
 155  eip >>= prof_shift;
 156 /*
 157  * Dont ignore out-of-bounds EIP values silently,
 158  * put them into the last histogram slot, so if
 159  * present, they will show up as a sharp peak.
 160  */
 161 if(eip > prof_len-1)
 162  eip = prof_len-1;
 163 atomic_inc((atomic_t *)&prof_buffer[eip]);
 164 }
 165 }
 166
 167 #endif