343 lines
7.8 KiB
C
343 lines
7.8 KiB
C
/*-
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* Copyright (c) 1997 Bruce Evans.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <machine/ipl.h>
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#include <machine/globals.h>
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#include <i386/isa/intr_machdep.h>
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/*
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* The volatile bitmap variables must be set atomically. This normally
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* involves using a machine-dependent bit-set or `or' instruction.
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*
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* Note: setbits uses a locked or, making simple cases MP safe.
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*/
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#define DO_SETBITS(name, var, bits) \
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void name(void) \
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{ \
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atomic_set_int(var, bits); \
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}
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DO_SETBITS(setdelayed, &ipending, loadandclear(&idelayed))
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DO_SETBITS(setsoftcamnet,&ipending, SWI_CAMNET_PENDING)
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DO_SETBITS(setsoftcambio,&ipending, SWI_CAMBIO_PENDING)
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DO_SETBITS(setsoftclock, &ipending, SWI_CLOCK_PENDING)
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DO_SETBITS(setsoftnet, &ipending, SWI_NET_PENDING)
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DO_SETBITS(setsofttty, &ipending, SWI_TTY_PENDING)
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DO_SETBITS(setsoftvm, &ipending, SWI_VM_PENDING)
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DO_SETBITS(schedsoftcamnet, &idelayed, SWI_CAMNET_PENDING)
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DO_SETBITS(schedsoftcambio, &idelayed, SWI_CAMBIO_PENDING)
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DO_SETBITS(schedsoftnet, &idelayed, SWI_NET_PENDING)
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DO_SETBITS(schedsofttty, &idelayed, SWI_TTY_PENDING)
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DO_SETBITS(schedsoftvm, &idelayed, SWI_VM_PENDING)
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unsigned
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softclockpending(void)
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{
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return (ipending & SWI_CLOCK_PENDING);
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}
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#ifndef SMP
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#define GENSPL(NAME, OP, MODIFIER, PC) \
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unsigned NAME(void) \
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{ \
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unsigned x; \
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\
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x = cpl; \
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cpl OP MODIFIER; \
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return (x); \
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}
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void
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spl0(void)
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{
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cpl = 0;
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if (ipending)
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splz();
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}
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void
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splx(unsigned ipl)
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{
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cpl = ipl;
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if (ipending & ~ipl)
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splz();
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}
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intrmask_t
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splq(intrmask_t mask)
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{
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intrmask_t tmp = cpl;
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cpl |= mask;
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return (tmp);
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}
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#else /* !SMP */
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#include <machine/smp.h>
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#include <machine/smptests.h>
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#ifndef SPL_DEBUG_POSTCODE
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#undef POSTCODE
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#undef POSTCODE_LO
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#undef POSTCODE_HI
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#define POSTCODE(X)
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#define POSTCODE_LO(X)
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#define POSTCODE_HI(X)
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#endif /* SPL_DEBUG_POSTCODE */
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/*
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* This version has to check for bsp_apic_ready,
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* as calling simple_lock() (ie ss_lock) before then deadlocks the system.
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* A sample count of GENSPL calls before bsp_apic_ready was set: 2193
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*/
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#ifdef INTR_SPL
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#ifdef SPL_DEBUG
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#define MAXZ 100000000
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#define SPIN_VAR unsigned z;
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#define SPIN_RESET z = 0;
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#if 0
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#define SPIN_SPL \
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if (++z >= MAXZ) { \
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/* XXX allow lock-free panic */ \
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bsp_apic_ready = 0; \
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panic("\ncil: 0x%08x", cil); \
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}
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#else
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#define SPIN_SPL \
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if (++z >= MAXZ) { \
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/* XXX allow lock-free panic */ \
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bsp_apic_ready = 0; \
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printf("\ncil: 0x%08x", cil); \
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breakpoint(); \
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}
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#endif /* 0/1 */
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#else /* SPL_DEBUG */
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#define SPIN_VAR
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#define SPIN_RESET
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#define SPIN_SPL
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#endif /* SPL_DEBUG */
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#endif
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#ifdef INTR_SPL
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#define GENSPL(NAME, OP, MODIFIER, PC) \
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unsigned NAME(void) \
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{ \
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unsigned x, y; \
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SPIN_VAR; \
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\
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if (!bsp_apic_ready) { \
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x = cpl; \
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cpl OP MODIFIER; \
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return (x); \
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} \
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\
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for (;;) { \
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IFCPL_LOCK(); /* MP-safe */ \
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x = y = cpl; /* current value */ \
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POSTCODE(0x20 | PC); \
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if (inside_intr) \
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break; /* XXX only 1 INT allowed */ \
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y OP MODIFIER; /* desired value */ \
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if (cil & y) { /* not now */ \
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IFCPL_UNLOCK(); /* allow cil to change */ \
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SPIN_RESET; \
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while (cil & y) \
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SPIN_SPL \
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continue; /* try again */ \
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} \
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break; \
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} \
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cpl OP MODIFIER; /* make the change */ \
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IFCPL_UNLOCK(); \
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\
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return (x); \
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}
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#else /* INTR_SPL */
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#define GENSPL(NAME, OP, MODIFIER, PC) \
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unsigned NAME(void) \
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{ \
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unsigned x; \
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\
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IFCPL_LOCK(); \
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x = cpl; \
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cpl OP MODIFIER; \
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IFCPL_UNLOCK(); \
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\
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return (x); \
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}
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#endif /* INTR_SPL */
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void
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spl0(void)
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{
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int unpend;
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#ifdef INTR_SPL
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SPIN_VAR;
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for (;;) {
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IFCPL_LOCK();
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POSTCODE_HI(0xc);
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/*
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* XXX SWI_AST_MASK in ipending has moved to 1 in astpending,
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* so the following code is dead, but just removing it may
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* not be right.
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*/
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#if 0
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if (cil & SWI_AST_MASK) { /* not now */
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IFCPL_UNLOCK(); /* allow cil to change */
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SPIN_RESET;
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while (cil & SWI_AST_MASK)
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SPIN_SPL
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continue; /* try again */
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}
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#endif
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break;
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}
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#else /* INTR_SPL */
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IFCPL_LOCK();
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#endif /* INTR_SPL */
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cpl = 0;
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unpend = ipending;
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IFCPL_UNLOCK();
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if (unpend && !inside_intr)
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splz();
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}
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void
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splx(unsigned ipl)
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{
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int unpend;
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#ifdef INTR_SPL
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SPIN_VAR;
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for (;;) {
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IFCPL_LOCK();
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POSTCODE_HI(0xe);
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if (inside_intr)
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break; /* XXX only 1 INT allowed */
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POSTCODE_HI(0xf);
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if (cil & ipl) { /* not now */
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IFCPL_UNLOCK(); /* allow cil to change */
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SPIN_RESET;
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while (cil & ipl)
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SPIN_SPL
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continue; /* try again */
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}
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break;
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}
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#else /* INTR_SPL */
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IFCPL_LOCK();
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#endif /* INTR_SPL */
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cpl = ipl;
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unpend = ipending & ~ipl;
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IFCPL_UNLOCK();
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if (unpend && !inside_intr)
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splz();
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}
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/*
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* Replaces UP specific inline found in (?) pci/pci_support.c.
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*
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* Stefan said:
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* You know, that splq() is used in the shared interrupt multiplexer, and that
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* the SMP version should not have too much overhead. If it is significantly
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* slower, then moving the splq() out of the loop in intr_mux() and passing in
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* the logical OR of all mask values might be a better solution than the
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* current code. (This logical OR could of course be pre-calculated whenever
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* another shared interrupt is registered ...)
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*/
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intrmask_t
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splq(intrmask_t mask)
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{
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intrmask_t tmp;
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#ifdef INTR_SPL
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intrmask_t tmp2;
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for (;;) {
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IFCPL_LOCK();
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tmp = tmp2 = cpl;
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tmp2 |= mask;
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if (cil & tmp2) { /* not now */
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IFCPL_UNLOCK(); /* allow cil to change */
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while (cil & tmp2)
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/* spin */ ;
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continue; /* try again */
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}
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break;
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}
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cpl = tmp2;
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#else /* INTR_SPL */
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IFCPL_LOCK();
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tmp = cpl;
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cpl |= mask;
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#endif /* INTR_SPL */
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IFCPL_UNLOCK();
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return (tmp);
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}
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#endif /* !SMP */
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/* Finally, generate the actual spl*() functions */
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/* NAME: OP: MODIFIER: PC: */
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GENSPL(splbio, |=, bio_imask, 2)
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GENSPL(splcam, |=, cam_imask, 7)
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GENSPL(splclock, =, HWI_MASK | SWI_MASK, 3)
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GENSPL(splhigh, =, HWI_MASK | SWI_MASK, 4)
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GENSPL(splimp, |=, net_imask, 5)
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GENSPL(splnet, |=, SWI_NET_MASK, 6)
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GENSPL(splsoftcam, |=, SWI_CAMBIO_MASK | SWI_CAMNET_MASK, 8)
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GENSPL(splsoftcambio, |=, SWI_CAMBIO_MASK, 9)
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GENSPL(splsoftcamnet, |=, SWI_CAMNET_MASK, 10)
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GENSPL(splsoftclock, =, SWI_CLOCK_MASK, 11)
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GENSPL(splsofttty, |=, SWI_TTY_MASK, 12)
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GENSPL(splsoftvm, |=, SWI_VM_MASK, 16)
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GENSPL(splstatclock, |=, stat_imask, 13)
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GENSPL(spltty, |=, tty_imask, 14)
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GENSPL(splvm, |=, net_imask | bio_imask | cam_imask, 15)
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