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#ifndef __irq_h
#define __irq_h
#include <asm/irq.h>
/*
* Interrupt controller descriptor. This is all we need
* to describe about the low-level hardware.
*/
struct hw_interrupt_type {
const char * typename;
void (*startup)(unsigned int irq);
void (*shutdown)(unsigned int irq);
void (*handle)(unsigned int irq, struct pt_regs * regs);
void (*enable)(unsigned int irq);
void (*disable)(unsigned int irq);
};
extern struct hw_interrupt_type no_irq_type;
/*
* IRQ line status.
*/
#define IRQ_INPROGRESS 1 /* IRQ handler active - do not enter! */
#define IRQ_DISABLED 2 /* IRQ disabled - do not enter! */
#define IRQ_PENDING 4 /* IRQ pending - replay on enable */
#define IRQ_REPLAY 8 /* IRQ has been replayed but not acked yet */
#define IRQ_AUTODETECT 16 /* IRQ is being autodetected */
#define IRQ_WAITING 32 /* IRQ not yet seen - for autodetection */
/*
* This is the "IRQ descriptor", which contains various information
* about the irq, including what kind of hardware handling it has,
* whether it is disabled etc etc.
*
* Pad this out to 32 bytes for cache and indexing reasons.
*/
typedef struct {
unsigned int status; /* IRQ status - IRQ_INPROGRESS, IRQ_DISABLED */
struct hw_interrupt_type *handler; /* handle/enable/disable functions */
struct irqaction *action; /* IRQ action list */
unsigned int depth; /* Disable depth for nested irq disables */
} irq_desc_t;
/*
* 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 might be merged
* into a single 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 irq_desc_t irq_desc[NR_IRQS];
extern int irq_vector[NR_IRQS];
#define IO_APIC_VECTOR(irq) irq_vector[irq]
extern void init_IRQ_SMP(void);
extern int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
extern int setup_x86_irq(unsigned int, struct irqaction *);
/*
* 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];
extern char ioapic_OEM_ID [16];
extern char ioapic_Product_ID [16];
extern spinlock_t irq_controller_lock;
#ifdef __SMP__
#include <asm/atomic.h>
static inline void irq_enter(int cpu, unsigned int irq)
{
hardirq_enter(cpu);
while (test_bit(0,&global_irq_lock)) {
/* nothing */;
}
}
static inline void irq_exit(int cpu, unsigned int irq)
{
hardirq_exit(cpu);
}
#define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs))
#else
#define irq_enter(cpu, irq) (++local_irq_count[cpu])
#define irq_exit(cpu, irq) (--local_irq_count[cpu])
#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
*/
#define BUILD_SMP_INTERRUPT(x) \
asmlinkage void x(void); \
__asm__( \
"\n"__ALIGN_STR"\n" \
SYMBOL_NAME_STR(x) ":\n\t" \
"pushl $-1\n\t" \
SAVE_ALL \
"call "SYMBOL_NAME_STR(smp_##x)"\n\t" \
"jmp ret_from_intr\n");
#define BUILD_SMP_TIMER_INTERRUPT(x) \
asmlinkage void x(struct pt_regs * regs); \
__asm__( \
"\n"__ALIGN_STR"\n" \
SYMBOL_NAME_STR(x) ":\n\t" \
"pushl $-1\n\t" \
SAVE_ALL \
"movl %esp,%eax\n\t" \
"pushl %eax\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() \
__asm__( \
"\n" __ALIGN_STR"\n" \
"common_interrupt:\n\t" \
SAVE_ALL \
"pushl $ret_from_intr\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 ;)
*/
#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]);
}
}
#endif
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