hw_irq.h
上传用户:jlfgdled
上传日期:2013-04-10
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文件大小:6k
- #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
- "cldnt"
- "pushl %esnt"
- "pushl %dsnt"
- "pushl %eaxnt"
- "pushl %ebpnt"
- "pushl %edint"
- "pushl %esint"
- "pushl %edxnt"
- "pushl %ecxnt"
- "pushl %ebxnt"
- "movl $" STR(__KERNEL_DS) ",%edxnt"
- "movl %edx,%dsnt"
- "movl %edx,%esnt"
- #define IRQ_NAME2(nr) nr##_interrupt(void)
- #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
- #define GET_CURRENT
- "movl %esp, %ebxnt"
- "andl $-8192, %ebxnt"
- /*
- * 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) ":nt"
- "pushl $"#v"-256nt"
- SAVE_ALL
- SYMBOL_NAME_STR(call_##x)":nt"
- "call "SYMBOL_NAME_STR(smp_##x)"nt"
- "jmp ret_from_intrn");
- #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) ":nt"
- "pushl $"#v"-256nt"
- SAVE_ALL
- "movl %esp,%eaxnt"
- "pushl %eaxnt"
- SYMBOL_NAME_STR(call_##x)":nt"
- "call "SYMBOL_NAME_STR(smp_##x)"nt"
- "addl $4,%espnt"
- "jmp ret_from_intrn");
- #define BUILD_COMMON_IRQ()
- asmlinkage void call_do_IRQ(void);
- __asm__(
- "n" __ALIGN_STR"n"
- "common_interrupt:nt"
- SAVE_ALL
- SYMBOL_NAME_STR(call_do_IRQ)":nt"
- "call " SYMBOL_NAME_STR(do_IRQ) "nt"
- "jmp ret_from_intrn");
- /*
- * 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:nt"
- "pushl $"#nr"-256nt"
- "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]);
- }
- #ifdef CONFIG_SMP /*more of this file should probably be ifdefed SMP */
- 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 */