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- /* $Id: hw_irq.h,v 1.2 2002/04/26 23:09:19 smilcke Exp $ */
-
- #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?
- */
- #ifdef TARGET_OS2
- static __inline__
- #else
- static inline
- #endif
- 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 */
- #ifdef TARGET_OS2
- static __inline__
- #else
- static inline
- #endif
- 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
- #ifdef TARGET_OS2
- static __inline__
- #else
- static inline
- #endif
- void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {}
- #endif
-
- #endif /* _ASM_HW_IRQ_H */
-