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#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 <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:
*
* (some of the following vectors are 'rare', they are merged
* into a single vector (FUNCTION_VECTOR) to save vector space.
* TLB, reschedule and local APIC vectors are performance-critical.)
*/
#define RESCHEDULE_VECTOR 0x30
#define INVALIDATE_TLB_VECTOR 0x31
#define STOP_CPU_VECTOR 0x40
#define LOCAL_TIMER_VECTOR 0x41
#define CALL_FUNCTION_VECTOR 0x50
/*
* First APIC vector available to drivers: (vectors 0x51-0xfe)
*/
#define IRQ0_TRAP_VECTOR 0x51
/*
* This IRQ should never happen, but we print a message nevertheless.
*/
#define SPURIOUS_APIC_VECTOR 0xff
extern int irq_vector[NR_IRQS];
#define IO_APIC_VECTOR(irq) irq_vector[irq]
extern void init_IRQ_SMP(void);
/*
* 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 no_action(int cpl, void *dev_id, struct pt_regs *regs);
extern void mask_irq(unsigned int irq);
extern void unmask_irq(unsigned int irq);
extern void disable_8259A_irq(unsigned int irq);
extern int i8259A_irq_pending(unsigned int irq);
extern void ack_APIC_irq(void);
extern void FASTCALL(send_IPI_self(int vector));
extern void init_VISWS_APIC_irqs(void);
extern void setup_IO_APIC(void);
extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);
extern void make_8259A_irq(unsigned int irq);
extern void send_IPI(int dest, int vector);
extern void init_pic_mode(void);
extern void print_IO_APIC(void);
extern unsigned long io_apic_irqs;
extern char _stext, _etext;
#define MAX_IRQ_SOURCES 128
#define MAX_MP_BUSSES 32
enum mp_bustype {
MP_BUS_ISA,
MP_BUS_EISA,
MP_BUS_PCI
};
extern int mp_bus_id_to_type [MAX_MP_BUSSES];
extern int mp_bus_id_to_pci_bus [MAX_MP_BUSSES];
#ifdef __SMP__
#define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs))
#else
#define IO_APIC_IRQ(x) (0)
#endif
#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 %dx,%ds\n\t" \
"movl %dx,%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"
#ifdef __SMP__
/*
* 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"\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"\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");
#endif /* __SMP__ */
#define BUILD_COMMON_IRQ() \
asmlinkage void call_do_IRQ(void); \
__asm__( \
"\n" __ALIGN_STR"\n" \
"common_interrupt:\n\t" \
SAVE_ALL \
"pushl $ret_from_intr\n\t" \
SYMBOL_NAME_STR(call_do_IRQ)":\n\t" \
"jmp "SYMBOL_NAME_STR(do_IRQ));
/*
* 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");
/*
* 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 && current->pid) {
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 __SMP__ /*more of this file should probably be ifdefed SMP */
static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int 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 */
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