diff options
Diffstat (limited to 'include/asm-x86_64/hw_irq.h')
| -rw-r--r-- | include/asm-x86_64/hw_irq.h | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/include/asm-x86_64/hw_irq.h b/include/asm-x86_64/hw_irq.h new file mode 100644 index 000000000000..2b5cb2865d21 --- /dev/null +++ b/include/asm-x86_64/hw_irq.h @@ -0,0 +1,144 @@ +#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> + * + * hacked by Andi Kleen for x86-64. + * + * $Id: hw_irq.h,v 1.24 2001/09/14 20:55:03 vojtech Exp $ + */ + +#ifndef __ASSEMBLY__ +#include <linux/config.h> +#include <asm/atomic.h> +#include <asm/irq.h> +#include <linux/profile.h> +#include <linux/smp.h> + +struct hw_interrupt_type; +#endif + +/* + * IDT vectors usable for external interrupt sources start + * at 0x20: + */ +#define FIRST_EXTERNAL_VECTOR 0x20 + +#define IA32_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 0xf0-0xf9 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 TASK_MIGRATION_VECTOR 0xfb +#define CALL_FUNCTION_VECTOR 0xfa +#define KDB_VECTOR 0xf9 + +#define THERMAL_APIC_VECTOR 0xf0 + + +/* + * 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 /* duplicated in irq.h */ + + +#ifndef __ASSEMBLY__ +extern u8 irq_vector[NR_IRQ_VECTORS]; +#define IO_APIC_VECTOR(irq) (irq_vector[irq]) +#define AUTO_ASSIGN -1 + +/* + * 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 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 void setup_ioapic_dest(void); + +extern unsigned long io_apic_irqs; + +extern atomic_t irq_err_count; +extern atomic_t irq_mis_count; + +#define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs)) + +#define __STR(x) #x +#define STR(x) __STR(x) + +#include <asm/ptrace.h> + +#define IRQ_NAME2(nr) nr##_interrupt(void) +#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr) + +/* + * SMP has a few special interrupts for IPI messages + */ + +#define BUILD_IRQ(nr) \ +asmlinkage void IRQ_NAME(nr); \ +__asm__( \ +"\n.p2align\n" \ +"IRQ" #nr "_interrupt:\n\t" \ + "push $" #nr "-256 ; " \ + "jmp common_interrupt"); + +#if defined(CONFIG_X86_IO_APIC) +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 + +#define platform_legacy_irq(irq) ((irq) < 16) + +#endif + +#endif /* _ASM_HW_IRQ_H */ |