d0c0856f63
membar_producer is supposed to be a store-store barrier. Also, in the code that FreeBSD has ported from illumos membar_producer is used only with regular stores to regular memory (with respect to caching). We do not have an MI primitive for the store-store barrier, so atomic_thread_fence_rel is the closest we have as it provides (load | store) -> store barrier. Previously, membar_producer was an empty function call on all 32-bit arm-s, 32-bit powerpc, riscv and all mips variants. I think that it was inadequate. On other platforms, such as amd64, arm64, i386, powerpc64, sparc64, membar_producer was implemented using stronger primitives than required for a store-store barrier with respect to regular memory access. For example, it used sfence on amd64 and lock-ed nop in i386 (despite TSO). On powerpc64 we now use recommended lwsync instead of eieio. On sparc64 FreeBSD uses TSO mode. On arm64/aarch64 we now use dmb sy instead of dmb ish. Not sure if this is an improvement, actually. After this change we can drop opensolaris_atomic.S for aarch64, amd64, powerpc64 and sparc64 as all required atomic operations have either direct or light-weight mapping to FreeBSD native atomic operations. Discussed with: kib MFC after: 4 weeks
191 lines
4.9 KiB
Groff
191 lines
4.9 KiB
Groff
.\"
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.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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.\"
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.\" Copyright (c) 2019 Andriy Gapon <avg@FreeBSD.org>
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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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.Dd October 9, 2019
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.Dt SUPERIO 9
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.Os
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.Sh NAME
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.Nm superio ,
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.Nm superio_devid ,
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.Nm superio_dev_disable ,
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.Nm superio_dev_enable ,
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.Nm superio_dev_enabled ,
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.Nm superio_find_dev ,
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.Nm superio_get_dma ,
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.Nm superio_get_iobase ,
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.Nm superio_get_irq ,
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.Nm superio_get_ldn ,
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.Nm superio_get_type ,
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.Nm superio_read ,
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.Nm superio_revid ,
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.Nm superio_vendor ,
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.Nm superio_write
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.Nd Super I/O bus interface
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.Sh SYNOPSIS
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.In sys/bus.h
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.In dev/superio/superio.h
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.Ft uint16_t
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.Fn superio_devid "device_t dev"
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.Ft void
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.Fn superio_dev_disable "device_t dev" "uint8_t mask"
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.Ft void
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.Fn superio_dev_enable "device_t dev" "uint8_t mask"
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.Ft bool
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.Fn superio_dev_enabled "device_t dev" "uint8_t mask"
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.Ft device_t
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.Fn superio_find_dev "device_t dev" "superio_dev_type_t type" "int ldn"
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.Ft uint8_t
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.Fn superio_get_dma "device_t dev"
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.Ft uint16_t
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.Fn superio_get_iobase "device_t dev"
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.Ft uint8_t
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.Fn superio_get_irq "device_t dev"
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.Ft uint8_t
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.Fn superio_get_ldn "device_t dev"
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.Ft superio_dev_type_t
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.Fn superio_get_type "device_t dev"
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.Ft uint8_t
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.Fn superio_read "device_t dev" "uint8_t reg"
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.Ft uint8_t
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.Fn superio_revid "device_t dev"
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.Ft superio_vendor_t
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.Fn superio_vendor "device_t dev"
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.Ft void
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.Fn superio_write "device_t dev" "uint8_t reg" "uint8_t val"
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.Sh DESCRIPTION
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The
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.Nm
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set of functions are used for managing Super I/O devices.
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The functions provide support for
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raw configuration access,
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locating devices,
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device information,
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and
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device configuration.
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.Ss The controller interface
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The
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.Fn superio_vendor
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function is used to get a vendor of the Super I/O controller
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.Fa dev .
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Possible return values are
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.Dv SUPERIO_VENDOR_ITE
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and
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.Dv SUPERIO_VENDOR_NUVOTON .
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.Pp
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The
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.Fn superio_devid
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function is used to get a device ID of the Super I/O controller
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.Fa dev .
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.Pp
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The
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.Fn superio_revid
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function is used to get a revision ID of the Super I/O controller
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.Fa dev .
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.Pp
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The
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.Fn superio_find_dev
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function is used to find a device on the
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.Xr superio 4
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bus, specified by
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.Fa dev,
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that has the requested type and logical device number.
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Either of those, but not both, can be a wildcard.
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Supported types are
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.Dv SUPERIO_DEV_GPIO ,
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.Dv SUPERIO_DEV_HWM ,
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and
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.Dv SUPERIO_DEV_WDT.
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The wildcard value for
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.Fa type
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is
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.Dv SUPERIO_DEV_NONE.
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The wildcard value for
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.Fa ldn
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is -1.
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.Ss The device interface
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The
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.Fn superio_read
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function is used to read data from the Super I/O configuration register
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of the device
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.Fa dev.
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.Pp
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The
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.Fn superio_write
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function is used to write data to the Super I/O configuration register
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of the device
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.Fa dev.
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.Pp
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The
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.Fn superio_dev_enable ,
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.Fn superio_dev_disable ,
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and
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.Fn superio_dev_enabled
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functions are used to enable, disable, or check status of the device
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.Fa dev.
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The
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.Fa mask
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parameter selects sub-functions of a device that supports them.
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For devices that do not have sub-functions,
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.Fa mask
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should be set to 1.
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.Ss The accessor interface
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The
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.Fn superio_get_dma
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is used to get a DMA channel number configured for the device
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.Fa dev .
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.Pp
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The
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.Fn superio_get_iobase
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is used to get a base I/O port configured for the device
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.Fa dev .
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The device may expose additional or alternative configuration access via
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the I/O ports.
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.Pp
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The
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.Fn superio_get_irq
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is used to get an interrupt number configured for the device
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.Fa dev .
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.Pp
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The
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.Fn superio_get_ldn
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is used to get a Logical Device Number of the device
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.Fa dev .
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.Pp
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The
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.Fn superio_get_type
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is used to get a type of the device
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.Fa dev .
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.Pp
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.Sh SEE ALSO
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.Xr superio 4 ,
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.Xr device 9 ,
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.Xr driver 9 ,
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.Sh AUTHORS
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This manual page was written by
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.An Andriy Gapon Mt avg@FreeBSD.org
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