c6a37e8413
critical_enter() and critical_exit() are now solely a mechanism for deferring kernel preemptions. They no longer have any affect on interrupts. This means that standalone critical sections are now very cheap as they are simply unlocked integer increments and decrements for the common case. Spin mutexes now use a separate KPI implemented in MD code: spinlock_enter() and spinlock_exit(). This KPI is responsible for providing whatever MD guarantees are needed to ensure that a thread holding a spin lock won't be preempted by any other code that will try to lock the same lock. For now all archs continue to block interrupts in a "spinlock section" as they did formerly in all critical sections. Note that I've also taken this opportunity to push a few things into MD code rather than MI. For example, critical_fork_exit() no longer exists. Instead, MD code ensures that new threads have the correct state when they are created. Also, we no longer try to fixup the idlethreads for APs in MI code. Instead, each arch sets the initial curthread and adjusts the state of the idle thread it borrows in order to perform the initial context switch. This change is largely a big NOP, but the cleaner separation it provides will allow for more efficient alternative locking schemes in other parts of the kernel (bare critical sections rather than per-CPU spin mutexes for per-CPU data for example). Reviewed by: grehan, cognet, arch@, others Tested on: i386, alpha, sparc64, powerpc, arm, possibly more
161 lines
4.5 KiB
C
161 lines
4.5 KiB
C
/*-
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* Copyright (c) 2001 M. Warner Losh. 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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/module.h>
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#include <sys/tty.h>
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#include <machine/bus_pio.h>
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#include <machine/bus.h>
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#include <sys/timepps.h>
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#include <dev/sio/siovar.h>
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#include <dev/pci/pcivar.h>
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static int sio_pci_attach(device_t dev);
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static void sio_pci_kludge_unit(device_t dev);
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static int sio_pci_probe(device_t dev);
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static device_method_t sio_pci_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, sio_pci_probe),
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DEVMETHOD(device_attach, sio_pci_attach),
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DEVMETHOD(device_detach, siodetach),
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{ 0, 0 }
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};
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static driver_t sio_pci_driver = {
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sio_driver_name,
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sio_pci_methods,
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0,
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};
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struct pci_ids {
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u_int32_t type;
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const char *desc;
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int rid;
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};
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static struct pci_ids pci_ids[] = {
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{ 0x100812b9, "3COM PCI FaxModem", 0x10 },
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{ 0x2000131f, "CyberSerial (1-port) 16550", 0x10 },
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{ 0x65851282, "Davicom 56PDV PCI Modem", 0x10 },
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{ 0x01101407, "Koutech IOFLEX-2S PCI Dual Port Serial", 0x10 },
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{ 0x01111407, "Koutech IOFLEX-2S PCI Dual Port Serial", 0x10 },
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{ 0x048011c1, "Lucent kermit based PCI Modem", 0x14 },
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{ 0x95211415, "Oxford Semiconductor PCI Dual Port Serial", 0x10 },
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{ 0x7101135e, "SeaLevel Ultra 530.PCI Single Port Serial", 0x18 },
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{ 0x0000151f, "SmartLink 5634PCV SurfRider", 0x10 },
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{ 0x0103115d, "Xircom Cardbus modem", 0x10 },
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{ 0x432214e4, "Broadcom 802.11g/GPRS CardBus (Serial)", 0x10 },
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{ 0x01c0135c, "Quatech SSCLP-200/300", 0x18
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/*
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* NB: You must mount the "SPAD" jumper to correctly detect
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* the FIFO on the UART. Set the options on the jumpers,
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* we do not support the extra registers on the Quatech.
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*/
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},
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{ 0x00000000, NULL, 0 }
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};
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static int
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sio_pci_attach(dev)
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device_t dev;
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{
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u_int32_t type;
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struct pci_ids *id;
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type = pci_get_devid(dev);
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id = pci_ids;
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while (id->type && id->type != type)
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id++;
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if (id->desc == NULL)
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return (ENXIO);
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sio_pci_kludge_unit(dev);
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return (sioattach(dev, id->rid, 0UL));
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}
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/*
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* Don't cut and paste this to other drivers. It is a horrible kludge
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* which will fail to work and also be unnecessary in future versions.
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*/
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static void
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sio_pci_kludge_unit(dev)
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device_t dev;
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{
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devclass_t dc;
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int err;
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int start;
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int unit;
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unit = 0;
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start = 0;
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while (resource_int_value("sio", unit, "port", &start) == 0 &&
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start > 0)
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unit++;
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if (device_get_unit(dev) < unit) {
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dc = device_get_devclass(dev);
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while (devclass_get_device(dc, unit))
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unit++;
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device_printf(dev, "moving to sio%d\n", unit);
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err = device_set_unit(dev, unit); /* EVIL DO NOT COPY */
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if (err)
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device_printf(dev, "error moving device %d\n", err);
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}
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}
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static int
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sio_pci_probe(dev)
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device_t dev;
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{
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u_int32_t type;
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struct pci_ids *id;
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type = pci_get_devid(dev);
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id = pci_ids;
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while (id->type && id->type != type)
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id++;
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if (id->desc == NULL)
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return (ENXIO);
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device_set_desc(dev, id->desc);
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#ifdef PC98
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SET_FLAG(dev, SET_IFTYPE(COM_IF_NS16550));
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#endif
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return (sioprobe(dev, id->rid, 0UL, 0));
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}
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DRIVER_MODULE(sio, pci, sio_pci_driver, sio_devclass, 0, 0);
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DRIVER_MODULE(sio, cardbus, sio_pci_driver, sio_devclass, 0, 0);
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