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+.\" $NetBSD: ksyms.4,v 1.10 2024/07/27 13:14:04 uwe Exp $
+.\"
+.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd July 27, 2024
+.Dt KSYMS 4
+.Os
+.Sh NAME
+.Nm ksyms
+.Nd kernel symbol table interface
+.Sh SYNOPSIS
+.Cd "pseudo-device ksyms"
+.Sh DESCRIPTION
+The
+.Pa /dev/ksyms
+character device provides a read-only interface to the current
+kernel symbol table.
+It can be accessed either as a sequential
+file, where it looks like an executable file but with zero-sized
+text and data segments, or via
+.Xr ioctl 2 .
+.Pp
+.Pa /dev/ksyms
+represents the symbol table at the time when the device is opened,
+and may not change until it is closed.
+.Pp
+The in-kernel symbol manager is designed to be able to handle
+any type of symbol table.
+However, only
+.Xr elf 5
+symbol tables are currently dealt with.
+.Sh IOCTLS
+The
+.Xr ioctl 2
+command codes below are defined in
+.In sys/ksyms.h .
+.Pp
+The (third) argument to the
+.Xr ioctl 2
+should be a pointer to the type indicated.
+.Bl -tag -width Dv -offset indent
+.It Dv KIOCGSIZE Pq Vt int
+Returns the total size of the current symbol table.
+This should be used when allocating a buffer to read in the
+whole symbol table to memory.
+.It Dv KIOCGVALUE Pq Vt struct ksyms_gvalue
+Returns the value for the given symbol name in a symtab-independent
+fashion.
+.Bd -literal -offset indent
+struct ksyms_gvalue {
+        const char *kv_name;
+        uint64_t kv_value;
+};
+.Ed
+.Pp
+The struct member
+.Fa kv_name
+should be set to the name of the requested value, and upon return
+.Fa kv_value
+contains the symbol value.
+.It Dv KIOCGSYMBOL Pq Vt struct ksyms_gsymbol
+Returns the complete symbol for the given symbol name.
+.Bd -literal -offset indent
+struct ksyms_gsymbol {
+        const char *kg_name;
+        void *kg_sym;
+};
+.Ed
+.Pp
+The struct member
+.Fa kg_name
+should be set to the name of the requested symbol, and the found
+symbol will be written to the
+.Fa kg_sym
+address.
+It is the callers responsibility to ensure that enough space
+for the symbol is allocated.
+.El
+.Sh FILES
+.Bl -tag -width Pa
+.It Pa /dev/ksyms
+.El
+.Sh SEE ALSO
+.Xr ioctl 2 ,
+.Xr nlist 3 ,
+.Xr elf 5
+.Sh HISTORY
+A
+.Nm
+device exists in many different operating systems.
+This implementation is modelled in function after Solaris
+.Nm .
+This
+.Nm
+driver was written by Anders Magnusson for
+.Nx .
+.Pp
+The
+.Nm
+driver first appeared in
+.Nx 2.0 .