ad018aa4da
Due to how the linker.hints file is laid out, we'll associate the pnp info with the wrong module if the module declaration comes after the pnp info. Until that limiation is removed, we need to have this ordering. Ideally, we'd also enforce the ordering somehow, but I've come up with no way to do that yet...
221 lines
5.5 KiB
Groff
221 lines
5.5 KiB
Groff
.\" Copyright (c) 2018 Conrad Meyer <cem@FreeBSD.org>
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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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.Dd May 23, 2019
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.Dt MODULE_PNP_INFO 9
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.Os
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.Sh NAME
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.Nm MODULE_PNP_INFO
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.Nd register plug and play information for device matching
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.\"
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.Sh SYNOPSIS
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.In sys/module.h
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.Fo MODULE_PNP_INFO
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.Fa "const char *descriptor_string"
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.Fa "bus"
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.Fa "module"
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.Fa "void *table"
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.Fa "size_t num_entries"
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.Fc
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.\"
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.Sh DESCRIPTION
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The
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.Fn MODULE_PNP_INFO
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macro registers a
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.Fa table
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of device-identifying data for use by
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.Xr devmatch 8 .
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Since it is built off module marking macros, it must follow a
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.Xr DRIVER_MODULE 9
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line.
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.Pp
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The macro takes a
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.Fa descriptor_string
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that describes the memory layout of table entries.
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The string is a series of members separated by semi-colons.
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Members are identified by a type and a name.
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They are encoded in the descriptor string by concatenating the type with a
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colon, followed by the name.
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(The special type
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.Vt W32
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represents two members.
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The first name is encoded like any other type.
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The second name is encoded by appending a forward slash and the second
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name after the first.)
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.Pp
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Types are one of the following:
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.Bl -tag -width U16
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.It Dq Vt U8
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.Vt uint8_t
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element.
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.It Dq Vt V8
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Same as
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.Vt U8 ,
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except that the sentinel value 0xFF matches any.
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.It Dq Vt G16
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.Vt uint16_t
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element; any value greater than or equal matches.
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.It Dq Vt L16
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.Vt uint16_t
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element; any value less than or equal matches.
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.It Dq Vt M16
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.Vt uint16_t
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element; mask of which of the following fields to use.
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.It Dq Vt U16
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.Vt uint16_t
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element.
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.It Dq Vt V16
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Same as
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.Vt U16 ,
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except that the sentinel value 0xFFFF matches any.
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.It Dq Vt U32
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.Vt uint32_t
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element.
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.It Dq Vt V32
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Same as
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.Vt U32 ,
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except that the sentinel value 0xFFFFFFFF matches any.
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.It Dq Vt W32
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Two
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.Vt uint16_t
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values; the first named member is in the least significant word and the second
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named member is in the most significant word.
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.It Dq Vt Z
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A pointer to a string to match exactly.
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.It Dq Vt D
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A pointer to a human readable description for the device.
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.It Dq Vt P
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A pointer that should be ignored.
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.It Dq Vt E
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EISA PNP Identifier.
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.It Dq Vt T
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PNP info that is true for the whole table.
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The driver code checks for these condition pragmatically before using
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this table to match devices.
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This item must come last in the list.
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.El
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.Pp
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The pseudo-name
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.Dq #
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is reserved for fields that should be ignored.
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Any member that does not match the parent device's pnpinfo output must be
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ignored.
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.Pp
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The
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.Fa bus
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parameter is an unquoted word naming the parent bus of the driver.
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For example,
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.Dq pci .
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.Pp
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The
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.Fa module
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parameter is also an unquoted word.
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It must be unique to the driver.
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Usually the driver's name is used.
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.Pp
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The
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.Fa table
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parameter points to the device matching data with entries matching the
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.Fa descriptor_string .
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.Pp
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The
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.Fa num_entries
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parameter is the number of entries in the table, i.e.,
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.Ql nitems(table) .
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Note that only valid entries should be included.
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If the table contains trailing zero or bogus values, they should not be
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included in
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.Fa num_entries .
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.\"
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.Sh EXAMPLES
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.Bl -tag -width ""
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.It Sy Example 1\&: No Using W32 for vendor/device pair
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.Pp
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The following example shows usage of
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.Vt W32
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type when vendor/device values are combined into single
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.Vt uint32_t
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value:
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.Bd -literal
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#include <sys/param.h>
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#include <sys/module.h>
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static struct my_pciids {
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uint32_t devid;
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const char *desc;
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} my_ids[] = {
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{ 0x12345678, "Foo bar" },
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{ 0x9abcdef0, "Baz fizz" },
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};
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MODULE_PNP_INFO("W32:vendor/device;D:#", pci, my_driver, my_ids,
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nitems(my_ids));
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.Ed
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.It Sy Example 2\&: No Using T for common vendor value
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.Pp
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The following example shows usage of
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.Vt T
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type when all entries in the table have the same vendor value:
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.Bd -literal
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#include <sys/param.h>
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#include <sys/module.h>
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static struct my_pciids {
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uint16_t device;
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const char *desc;
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} my_ids[] = {
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{ 0x9abc, "Foo bar" },
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{ 0xdef0, "Baz fizz" },
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};
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MODULE_PNP_INFO("U16:device;D:#;T:vendor=0x1234", pci, my_driver,
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my_ids, nitems(my_ids));
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.Ed
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.El
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.\"
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.Sh BUGS
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The
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.Nm
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macro must follow
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.Dv DRIVER_MODULE
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invocations due to limitations in the
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.Dv linker.hints
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file format.
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.Sh SEE ALSO
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.Xr devmatch 8 ,
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.Xr DRIVER_MODULE 9 ,
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.Xr module 9
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.Sh HISTORY
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The macro
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.Nm
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appeared in
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.Fx 11.0 .
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.Sh AUTHORS
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The PNP framework and
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.Xr devmatch 8
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utility were written by
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.An Warner Losh Aq Mt imp@FreeBSD.org .
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