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bootloader. Implement the following routines: pcibios-device-count count the number of instances of a devid pcibios-read-config read pci config space pcibios-write-config write pci config space pcibios-find-devclass find the nth device with a given devclass pcibios-find-device find the nth device with a given devid pcibios-locator convert bus device function ti pcibios locator These commands are thin wrappers over their PCI BIOS 2.1 counterparts. More informaiton, such as it is, can be found in the standard. Export a nunmber of pcibios.X variables into the environment to report what the PCI IDENTIFY command returned. Also implmenet a new command line primitive (pci-device-count), but don't include it by default just yet, since it depends on the recently added words and any errors here can render a system unbootable. This is intended to allow the boot loader to do special things based on the hardware it finds. This could be have special settings that are optimized for the specific cards, or even loading special drivers. It goes without saying that writing to pci config space should not be done without a just cause and a sound mind. Sponsored by: Netflix
48 lines
2.0 KiB
Forth
48 lines
2.0 KiB
Forth
\ Copyright (c) 2014 M. Warner Losh <imp@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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only forth also support-functions also builtins definitions
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\ pci-device-count pci-id
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\
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\ Counts the number of instances of pci-id in the system and reports
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\ it to the user.
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: pci-device-count
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0= if ( interpreted ) get_arguments then
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0= if ." Need an argument" cr abort then
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\ First argument is 0 when we're interprated. See support.4th
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\ for get_arguments reading the rest of the line and parsing it
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\ stack: argN lenN ... arg1 len1 N
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hex ?number decimal
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0= if ." Bad pci-id given (must be legal hex value)" cr abort then
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dup pcibios-device-count ." Found " . ." instances of " hex . decimal cr
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;
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also forth definitions also builtins
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builtin: pci-device-count
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