259 lines
6.0 KiB
C
259 lines
6.0 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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* $Id: ipl_funcs.c,v 1.6 1997/08/29 18:45:23 fsmp Exp $
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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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#ifndef SMP
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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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#define DO_SETBITS(name, var, bits) \
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void name(void) \
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{ \
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setbits(var, bits); \
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}
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DO_SETBITS(setdelayed, &ipending, loadandclear((unsigned *)&idelayed))
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DO_SETBITS(setsoftast, &ipending, SWI_AST_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(schedsoftnet, &idelayed, SWI_NET_PENDING)
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DO_SETBITS(schedsofttty, &idelayed, SWI_TTY_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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#define GENSPL(name, set_cpl) \
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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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set_cpl; \
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return (x); \
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}
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GENSPL(splbio, cpl |= bio_imask)
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GENSPL(splclock, cpl = HWI_MASK | SWI_MASK)
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GENSPL(splhigh, cpl = HWI_MASK | SWI_MASK)
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GENSPL(splimp, cpl |= net_imask)
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GENSPL(splnet, cpl |= SWI_NET_MASK)
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GENSPL(splsoftclock, cpl = SWI_CLOCK_MASK)
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GENSPL(splsofttty, cpl |= SWI_TTY_MASK)
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GENSPL(splstatclock, cpl |= stat_imask)
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GENSPL(spltty, cpl |= tty_imask)
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GENSPL(splvm, cpl |= net_imask | bio_imask)
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void
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spl0(void)
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{
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cpl = SWI_AST_MASK;
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if (ipending & ~SWI_AST_MASK)
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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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#else /* !SMP */
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#include <machine/smp.h>
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extern int bspEarly; /* XXX */
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#ifdef REAL_IFCPL
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#define IFCPL_LOCK() SCPL_LOCK()
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#define IFCPL_UNLOCK() SCPL_UNLOCK()
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#else /* REAL_IFCPL */
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#define IFCPL_LOCK()
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#define IFCPL_UNLOCK()
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#endif /* REAL_IFCPL */
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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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#define DO_SETBITS(name, var, bits) \
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void name(void) \
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{ \
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IFCPL_LOCK(); \
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setbits(var, bits); \
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IFCPL_UNLOCK(); \
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}
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DO_SETBITS(setdelayed, &ipending, loadandclear((unsigned *)&idelayed))
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DO_SETBITS(setsoftast, &ipending, SWI_AST_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(schedsoftnet, &idelayed, SWI_NET_PENDING)
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DO_SETBITS(schedsofttty, &idelayed, SWI_TTY_PENDING)
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unsigned
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softclockpending(void)
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{
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unsigned x;
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IFCPL_LOCK();
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x = ipending & SWI_CLOCK_PENDING;
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IFCPL_UNLOCK();
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return x;
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}
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#ifdef notneeded
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#define GENSPL(name, set_cpl) \
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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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/* XXX test cil */ \
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set_cpl; \
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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 /* notneeded */
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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 GENSPLR calls before bsp_apic_ready was set: 2193
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*/
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#define GENSPLR(name, set_cpl) \
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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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if (bsp_apic_ready) \
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IFCPL_LOCK(); \
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x = cpl; \
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/* XXX test cil */ \
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set_cpl; \
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if (bsp_apic_ready) \
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IFCPL_UNLOCK(); \
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\
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return (x); \
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}
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GENSPLR(splbio, cpl |= bio_imask)
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GENSPLR(splclock, cpl = HWI_MASK | SWI_MASK)
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GENSPLR(splhigh, cpl = HWI_MASK | SWI_MASK)
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GENSPLR(splimp, cpl |= net_imask)
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GENSPLR(splnet, cpl |= SWI_NET_MASK)
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GENSPLR(splsoftclock, cpl = SWI_CLOCK_MASK)
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GENSPLR(splsofttty, cpl |= SWI_TTY_MASK)
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GENSPLR(splstatclock, cpl |= stat_imask)
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GENSPLR(spltty, cpl |= tty_imask)
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GENSPLR(splvm, cpl |= net_imask | bio_imask)
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void
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spl0(void)
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{
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IFCPL_LOCK();
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/* XXX test cil */
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cpl = SWI_AST_MASK;
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if (ipending & ~SWI_AST_MASK) {
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IFCPL_UNLOCK();
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splz();
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}
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else
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IFCPL_UNLOCK();
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}
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void
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splx(unsigned ipl)
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{
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if (bsp_apic_ready)
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IFCPL_LOCK();
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/* XXX test cil */
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cpl = ipl;
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if (ipending & ~ipl) {
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if (bsp_apic_ready)
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IFCPL_UNLOCK();
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splz();
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}
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else
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if (bsp_apic_ready)
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IFCPL_UNLOCK();
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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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IFCPL_LOCK();
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tmp = cpl;
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cpl |= mask;
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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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