This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / asm-i386 / mach-xen / irq_vectors.h

diff --git a/include/asm-i386/mach-xen/irq_vectors.h b/include/asm-i386/mach-xen/irq_vectors.h
new file mode 100644 (file)
index 0000000..49e5ac0
--- /dev/null
+++ b/include/asm-i386/mach-xen/irq_vectors.h
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+/*
+ * This file should contain #defines for all of the interrupt vector
+ * numbers used by this architecture.
+ *
+ * In addition, there are some standard defines:
+ *
+ *     FIRST_EXTERNAL_VECTOR:
+ *             The first free place for external interrupts
+ *
+ *     SYSCALL_VECTOR:
+ *             The IRQ vector a syscall makes the user to kernel transition
+ *             under.
+ *
+ *     TIMER_IRQ:
+ *             The IRQ number the timer interrupt comes in at.
+ *
+ *     NR_IRQS:
+ *             The total number of interrupt vectors (including all the
+ *             architecture specific interrupts) needed.
+ *
+ */                    
+#ifndef _ASM_IRQ_VECTORS_H
+#define _ASM_IRQ_VECTORS_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.
+ */
+
+#if 0
+/*
+ * 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
+
+#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
+#endif
+
+#define SPURIOUS_APIC_VECTOR   0xff
+#define ERROR_APIC_VECTOR      0xfe
+
+/*
+ * 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
+
+/*
+ * 16 8259A IRQ's, 208 potential APIC interrupt sources.
+ * Right now the APIC is mostly only used for SMP.
+ * 256 vectors is an architectural limit. (we can have
+ * more than 256 devices theoretically, but they will
+ * have to use shared interrupts)
+ * Since vectors 0x00-0x1f are used/reserved for the CPU,
+ * the usable vector space is 0x20-0xff (224 vectors)
+ */
+
+#define RESCHEDULE_VECTOR      0
+#define CALL_FUNCTION_VECTOR   1
+#define NR_IPIS                        2
+
+/*
+ * The maximum number of vectors supported by i386 processors
+ * is limited to 256. For processors other than i386, NR_VECTORS
+ * should be changed accordingly.
+ */
+#define NR_VECTORS 256
+
+#define FPU_IRQ                        13
+
+#define        FIRST_VM86_IRQ          3
+#define LAST_VM86_IRQ          15
+#define invalid_vm86_irq(irq)  ((irq) < 3 || (irq) > 15)
+
+/*
+ * The flat IRQ space is divided into two regions:
+ *  1. A one-to-one mapping of real physical IRQs. This space is only used
+ *     if we have physical device-access privilege. This region is at the 
+ *     start of the IRQ space so that existing device drivers do not need
+ *     to be modified to translate physical IRQ numbers into our IRQ space.
+ *  3. A dynamic mapping of inter-domain and Xen-sourced virtual IRQs. These
+ *     are bound using the provided bind/unbind functions.
+ */
+
+#define PIRQ_BASE              0
+#define NR_PIRQS               256
+
+#define DYNIRQ_BASE            (PIRQ_BASE + NR_PIRQS)
+#define NR_DYNIRQS             256
+
+#define NR_IRQS                        (NR_PIRQS + NR_DYNIRQS)
+#define NR_IRQ_VECTORS         NR_IRQS
+
+#define pirq_to_irq(_x)                ((_x) + PIRQ_BASE)
+#define irq_to_pirq(_x)                ((_x) - PIRQ_BASE)
+
+#define dynirq_to_irq(_x)      ((_x) + DYNIRQ_BASE)
+#define irq_to_dynirq(_x)      ((_x) - DYNIRQ_BASE)
+
+#endif /* _ASM_IRQ_VECTORS_H */