mirror of https://github.com/mkerrisk/man-pages
90 lines
2.3 KiB
Groff
90 lines
2.3 KiB
Groff
.\" Contributed by Niki A. Rahimi, LTC Security Development
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.\" narahimi@us.ibm.com
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.\" May be freely distributed.
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.\"
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.TH PCICONFIG_READ 2 2003-07-14 "Linux 2.4.19" "Linux Programmer's Manual"
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.SH NAME
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pciconfig_read, pciconfig_write, pciconfig_iobase \- pci device information handling
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.SH SYNOPSIS
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.nf
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.B #include <pci.h>
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.sp
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.BI "int pciconfig_read(unsigned long " bus ", unsigned long " dfn ,
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.BI " unsigned long " off ", unsigned long " len ", void *" buf );
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.BI "int pciconfig_write(unsigned long " bus ", unsigned long " dfn ,
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.BI " unsigned long " off ", unsigned long " len ", void *" buf );
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.BI "int pciconfig_iobase(long " which ", unsigned long " bus ,
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.BI " unsigned long " devfn );
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.fi
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.SH DESCRIPTION
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.TP
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Most of the interaction with PCI devices is already handled by the kernel PCI layer, and thus these calls should not normally need to be accessed from userspace.
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.TP
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.BR pciconfig_read ()
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Reads to
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.I
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buf
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from device
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.I
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dev
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at offset
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.I
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off
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value.
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.TP
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.BR pciconfig_write ()
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Writes from
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.I
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buf
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to device
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.I
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dev
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at offset
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.I
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off
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value.
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.TP
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.BR pciconfig_iobase ()
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You pass it a bus/devfn pair and get a physical address for either the memory offset (for things like prep, this is 0xc0000000), the IO base for PIO cycles, or the ISA holes if any.
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.SH "RETURN VALUE"
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.TP
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.BR pciconfig_read ()
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On success zero is returned. On error, \-1 is returned and errno is set appropriately.
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.TP
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.BR pciconfig_write ()
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On success zero is returned. On error, \-1 is returned and errno is set appropriately.
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.TP
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.BR pciconfig_iobase ()
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Returns information on locations of various I/O regions in physical memory according to the
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.I which
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value. Values for
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.I which
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are: IOBASE_BRIDGE_NUMBER, IOBASE_MEMORY, IOBASE_IO, IOBASE_ISA_IO, IOBASE_ISA_MEM.
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.SH ERRORS
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.TP
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.B EINVAL
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.I len
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value is invalid. This does not apply to pci_iobase.
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.TP
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.B EIO
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I/O error.
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.TP
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.B ENODEV
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For pci_iobase, hose value is NULL? For the other calls, could not find a slot.
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.TP
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.B ENOSYS
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The system has not implemented these calls (CONFIG_PCI not defined).
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.TP
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.B EOPNOTSUPP
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This return value is only valid for pci_iobase. It is returned if the value for
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.I
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which
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is invalid.
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.TP
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.B EPERM
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User does not have the CAP_SYS_ADMIN capability. This does not apply to pci_iobase.
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.SH "CONFORMING TO"
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These calls are Linux specific, available since Linux 2.0.26/2.1.11.
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.SH "SEE ALSO"
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.BR capabilities (7)
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