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freebsd-skq/sys/i386/isa/intr_machdep.h
John Baldwin 6caa8a1501 Overhaul of the SMP code. Several portions of the SMP kernel support have 
been made machine independent and various other adjustments have been made
to support Alpha SMP.

- It splits the per-process portions of hardclock() and statclock() off
  into hardclock_process() and statclock_process() respectively.  hardclock()
  and statclock() call the *_process() functions for the current process so
  that UP systems will run as before.  For SMP systems, it is simply necessary
  to ensure that all other processors execute the *_process() functions when the
  main clock functions are triggered on one CPU by an interrupt.  For the alpha
  4100, clock interrupts are delievered in a staggered broadcast fashion, so
  we simply call hardclock/statclock on the boot CPU and call the *_process()
  functions on the secondaries.  For x86, we call statclock and hardclock as
  usual and then call forward_hardclock/statclock in the MD code to send an IPI
  to cause the AP's to execute forwared_hardclock/statclock which then call the
  *_process() functions.
- forward_signal() and forward_roundrobin() have been reworked to be MI and to
  involve less hackery.  Now the cpu doing the forward sets any flags, etc. and
  sends a very simple IPI_AST to the other cpu(s).  AST IPIs now just basically
  return so that they can execute ast() and don't bother with setting the
  astpending or needresched flags themselves.  This also removes the loop in
  forward_signal() as sched_lock closes the race condition that the loop worked
  around.
- need_resched(), resched_wanted() and clear_resched() have been changed to take
  a process to act on rather than assuming curproc so that they can be used to
  implement forward_roundrobin() as described above.
- Various other SMP variables have been moved to a MI subr_smp.c and a new
  header sys/smp.h declares MI SMP variables and API's.   The IPI API's from
  machine/ipl.h have moved to machine/smp.h which is included by sys/smp.h.
- The globaldata_register() and globaldata_find() functions as well as the
  SLIST of globaldata structures has become MI and moved into subr_smp.c.
  Also, the globaldata list is only available if SMP support is compiled in.

Reviewed by:	jake, peter
Looked over by:	eivind
2001-04-27 19:28:25 +00:00

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/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _I386_ISA_INTR_MACHDEP_H_
#define _I386_ISA_INTR_MACHDEP_H_
/*
* Low level interrupt code.
*/
#ifdef _KERNEL
#if defined(SMP) || defined(APIC_IO)
/*
* XXX FIXME: rethink location for all IPI vectors.
*/
/*
APIC TPR priority vector levels:
0xff (255) +-------------+
| | 15 (IPIs: Xspuriousint)
0xf0 (240) +-------------+
| | 14
0xe0 (224) +-------------+
| | 13
0xd0 (208) +-------------+
| | 12
0xc0 (192) +-------------+
| | 11
0xb0 (176) +-------------+
| | 10 (IPIs: Xcpustop)
0xa0 (160) +-------------+
| | 9 (IPIs: Xinvltlb)
0x90 (144) +-------------+
| | 8 (linux/BSD syscall, IGNORE FAST HW INTS)
0x80 (128) +-------------+
| | 7 (FAST_INTR 16-23)
0x70 (112) +-------------+
| | 6 (FAST_INTR 0-15)
0x60 (96) +-------------+
| | 5 (IGNORE HW INTS)
0x50 (80) +-------------+
| | 4 (2nd IO APIC)
0x40 (64) +------+------+
| | | 3 (upper APIC hardware INTs: PCI)
0x30 (48) +------+------+
| | 2 (start of hardware INTs: ISA)
0x20 (32) +-------------+
| | 1 (exceptions, traps, etc.)
0x10 (16) +-------------+
| | 0 (exceptions, traps, etc.)
0x00 (0) +-------------+
*/
/* IDT vector base for regular (aka. slow) and fast interrupts */
#define TPR_SLOW_INTS 0x20
#define TPR_FAST_INTS 0x60
/* blocking values for local APIC Task Priority Register */
#define TPR_BLOCK_HWI 0x4f /* hardware INTs */
#define TPR_IGNORE_HWI 0x5f /* ignore INTs */
#define TPR_BLOCK_FHWI 0x7f /* hardware FAST INTs */
#define TPR_IGNORE_FHWI 0x8f /* ignore FAST INTs */
#define TPR_BLOCK_XINVLTLB 0x9f /* */
#define TPR_BLOCK_XCPUSTOP 0xaf /* */
#define TPR_BLOCK_ALL 0xff /* all INTs */
#ifdef TEST_TEST1
/* put a 'fake' HWI in top of APIC prio 0x3x, 32 + 31 = 63 = 0x3f */
#define XTEST1_OFFSET (ICU_OFFSET + 31)
#endif /** TEST_TEST1 */
/* TLB shootdowns */
#define XINVLTLB_OFFSET (ICU_OFFSET + 112)
/* inter-cpu clock handling */
#define XHARDCLOCK_OFFSET (ICU_OFFSET + 113)
#define XSTATCLOCK_OFFSET (ICU_OFFSET + 114)
/* inter-CPU rendezvous */
#define XRENDEZVOUS_OFFSET (ICU_OFFSET + 115)
/* IPI to generate an additional software trap at the target CPU */
#define XCPUAST_OFFSET (ICU_OFFSET + 48)
/* IPI to signal CPUs to stop and wait for another CPU to restart them */
#define XCPUSTOP_OFFSET (ICU_OFFSET + 128)
/*
* Note: this vector MUST be xxxx1111, 32 + 223 = 255 = 0xff:
*/
#define XSPURIOUSINT_OFFSET (ICU_OFFSET + 223)
#endif /* SMP || APIC_IO */
#ifndef LOCORE
/*
* Type of the first (asm) part of an interrupt handler.
*/
typedef void inthand_t __P((u_int cs, u_int ef, u_int esp, u_int ss));
#define IDTVEC(name) __CONCAT(X,name)
extern u_long *intr_countp[]; /* pointers into intrcnt[] */
extern driver_intr_t *intr_handler[]; /* C entry points of intr handlers */
extern struct ithd *ithds[];
extern void *intr_unit[]; /* cookies to pass to intr handlers */
extern struct ithd softinterrupt; /* soft interrupt thread */
inthand_t
IDTVEC(fastintr0), IDTVEC(fastintr1),
IDTVEC(fastintr2), IDTVEC(fastintr3),
IDTVEC(fastintr4), IDTVEC(fastintr5),
IDTVEC(fastintr6), IDTVEC(fastintr7),
IDTVEC(fastintr8), IDTVEC(fastintr9),
IDTVEC(fastintr10), IDTVEC(fastintr11),
IDTVEC(fastintr12), IDTVEC(fastintr13),
IDTVEC(fastintr14), IDTVEC(fastintr15);
inthand_t
IDTVEC(intr0), IDTVEC(intr1), IDTVEC(intr2), IDTVEC(intr3),
IDTVEC(intr4), IDTVEC(intr5), IDTVEC(intr6), IDTVEC(intr7),
IDTVEC(intr8), IDTVEC(intr9), IDTVEC(intr10), IDTVEC(intr11),
IDTVEC(intr12), IDTVEC(intr13), IDTVEC(intr14), IDTVEC(intr15);
#if defined(SMP) || defined(APIC_IO)
inthand_t
IDTVEC(fastintr16), IDTVEC(fastintr17),
IDTVEC(fastintr18), IDTVEC(fastintr19),
IDTVEC(fastintr20), IDTVEC(fastintr21),
IDTVEC(fastintr22), IDTVEC(fastintr23),
IDTVEC(fastintr24), IDTVEC(fastintr25),
IDTVEC(fastintr26), IDTVEC(fastintr27),
IDTVEC(fastintr28), IDTVEC(fastintr29),
IDTVEC(fastintr30), IDTVEC(fastintr31);
inthand_t
IDTVEC(intr16), IDTVEC(intr17), IDTVEC(intr18), IDTVEC(intr19),
IDTVEC(intr20), IDTVEC(intr21), IDTVEC(intr22), IDTVEC(intr23),
IDTVEC(intr24), IDTVEC(intr25), IDTVEC(intr26), IDTVEC(intr27),
IDTVEC(intr28), IDTVEC(intr29), IDTVEC(intr30), IDTVEC(intr31);
inthand_t
Xinvltlb, /* TLB shootdowns */
Xhardclock, /* Forward hardclock() */
Xstatclock, /* Forward statclock() */
Xcpuast, /* Additional software trap on other cpu */
Xcpustop, /* CPU stops & waits for another CPU to restart it */
Xspuriousint, /* handle APIC "spurious INTs" */
Xrendezvous; /* handle CPU rendezvous */
#ifdef TEST_TEST1
inthand_t
Xtest1; /* 'fake' HWI at top of APIC prio 0x3x, 32+31 = 0x3f */
#endif /** TEST_TEST1 */
#endif /* SMP || APIC_IO */
#ifdef PC98
#define ICU_IMR_OFFSET 2 /* IO_ICU{1,2} + 2 */
#define ICU_SLAVEID 7
#else
#define ICU_IMR_OFFSET 1 /* IO_ICU{1,2} + 1 */
#define ICU_SLAVEID 2
#endif
#ifdef APIC_IO
/*
* This is to accommodate "mixed-mode" programming for
* motherboards that don't connect the 8254 to the IO APIC.
*/
#define AUTO_EOI_1 1
#endif
#define NR_INTRNAMES (1 + ICU_LEN + 2 * ICU_LEN)
void isa_defaultirq __P((void));
int isa_nmi __P((int cd));
int icu_setup __P((int intr, driver_intr_t *func, void *arg,
int flags));
int icu_unset __P((int intr, driver_intr_t *handler));
/*
* WARNING: These are internal functions and not to be used by device drivers!
* They are subject to change without notice.
*/
int inthand_add(const char *name, int irq, driver_intr_t handler, void *arg,
enum intr_type flags, void **cookiep);
int inthand_remove(void *cookie);
void sched_ithd(void *dummy);
#endif /* LOCORE */
#endif /* _KERNEL */
#endif /* !_I386_ISA_INTR_MACHDEP_H_ */
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