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/* $OpenBSD: intrdefs.h,v 1.3 2005/05/25 23:17:47 niklas Exp $ */
/* $NetBSD: intrdefs.h,v 1.2 2003/05/04 22:01:56 fvdl Exp $ */
#ifndef _i386_INTRDEFS_H
#define _i386_INTRDEFS_H
/*
* Intel APICs (advanced programmable interrupt controllers) have
* bytesized priority registers where the upper nibble is the actual
* interrupt priority level (a.k.a. IPL). Interrupt vectors are
* closely tied to these levels as interrupts whose vectors' upper
* nibble is lower than or equal to the current level are blocked.
* Not all 256 possible vectors are available for interrupts in
* APIC systems, only
*
* For systems where instead the older ICU (interrupt controlling
* unit, a.k.a. PIC or 82C59) is used, the IPL is not directly useful,
* since the interrupt blocking is handled via interrupt masks instead
* of levels. However the IPL is easily used as an offset into arrays
* of masks.
*/
#define IPLSHIFT 4 /* The upper nibble of vectors is the IPL. */
#define NIPL 16 /* Four bits of information gives as much. */
#define IPL(level) ((level) >> IPLSHIFT) /* Extract the IPL. */
/* XXX Maybe this IDTVECOFF definition should be elsewhere? */
#define IDTVECOFF 0x20 /* The lower 32 IDT vectors are reserved. */
/*
* This macro is only defined for 0 <= x < 14, i.e. there are fourteen
* distinct priority levels available for interrupts.
*/
#define MAKEIPL(priority) (IDTVECOFF + ((priority) << IPLSHIFT))
/*
* Interrupt priority levels.
*
* XXX We are somewhat sloppy about what we mean by IPLs, sometimes
* XXX we refer to the eight-bit value suitable for storing into APICs'
* XXX priority registers, other times about the four-bit entity found
* XXX in the former values' upper nibble, which can be used as offsets
* XXX in various arrays of our implementation. We are hoping that
* XXX the context will provide enough information to not make this
* XXX sloppy naming a real problem.
*
* There are tty, network and disk drivers that use free() at interrupt
* time, so imp > (tty | net | bio).
*
* Since run queues may be manipulated by both the statclock and tty,
* network, and disk drivers, clock > imp.
*
* IPL_HIGH must block everything that can manipulate a run queue.
*
* XXX Ultimately we may need serial drivers to run at the absolute highest
* XXX priority to avoid overruns, then we must make serial > high.
*
* The level numbers are picked to fit into APIC vector priorities.
*/
#define IPL_NONE 0 /* nothing */
#define IPL_SOFTCLOCK MAKEIPL(0) /* timeouts */
#define IPL_SOFTNET MAKEIPL(1) /* protocol stacks */
#define IPL_BIO MAKEIPL(2) /* block I/O */
#define IPL_NET MAKEIPL(3) /* network */
#define IPL_SOFTTTY MAKEIPL(4) /* delayed terminal handling */
#define IPL_TTY MAKEIPL(5) /* terminal */
#define IPL_VM MAKEIPL(6) /* memory allocation */
#define IPL_IMP IPL_VM /* XXX - should not be here. */
#define IPL_AUDIO MAKEIPL(7) /* audio */
#define IPL_CLOCK MAKEIPL(8) /* clock */
#define IPL_STATCLOCK MAKEIPL(9) /* statclock */
#define IPL_SCHED IPL_STATCLOCK
#define IPL_HIGH MAKEIPL(9) /* everything */
#define IPL_IPI MAKEIPL(10) /* interprocessor interrupt */
/* Interrupt sharing types. */
#define IST_NONE 0 /* none */
#define IST_PULSE 1 /* pulsed */
#define IST_EDGE 2 /* edge-triggered */
#define IST_LEVEL 3 /* level-triggered */
/*
* Local APIC masks. Must not conflict with SIR_* below, and must
* be >= NUM_LEGACY_IRQs. Note that LIR_IPI must be first.
*/
#define LIR_IPI 31
#define LIR_TIMER 30
/* Soft interrupt masks. */
#define SIR_CLOCK 29
#define SIR_NET 28
#define SIR_TTY 27
/*
* Maximum # of interrupt sources per CPU. 32 to fit in one word.
* ioapics can theoretically produce more, but it's not likely to
* happen. For multiple ioapics, things can be routed to different
* CPUs.
*/
#define MAX_INTR_SOURCES 32
#define NUM_LEGACY_IRQS 16
/*
* Low and high boundaries between which interrupt gates will
* be allocated in the IDT.
*/
#define IDT_INTR_LOW (0x20 + NUM_LEGACY_IRQS)
#define IDT_INTR_HIGH 0xef
#define I386_IPI_HALT 0x00000001
#define I386_IPI_MICROSET 0x00000002
#define I386_IPI_FLUSH_FPU 0x00000004
#define I386_IPI_SYNCH_FPU 0x00000008
#define I386_IPI_TLB 0x00000010
#define I386_IPI_MTRR 0x00000020
#define I386_IPI_GDT 0x00000040
#define I386_IPI_DDB 0x00000080 /* synchronize while in ddb */
#define I386_NIPI 8
#define I386_IPI_NAMES { "halt IPI", "timeset IPI", "FPU flush IPI", \
"FPU synch IPI", "TLB shootdown IPI", \
"MTRR update IPI", "GDT update IPI", \
"DDB IPI" }
#define IREENT_MAGIC 0x18041969
#endif /* _I386_INTRDEFS_H */
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