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.\" $FreeBSD: head/share/man/man9/pmap_map.9 267936 2014-06-26 21:44:30Z bapt $
.\"
.Dd July 21, 2003
.Dt PMAP_MAP 9
.Os
.Sh NAME
.Nm pmap_map
.Nd map a physical memory range into kernel virtual address (KVA) space
.Sh SYNOPSIS
.In sys/param.h
.In vm/vm.h
.In vm/pmap.h
.Ft vm_offset_t
.Fo pmap_map
.Fa "vm_offset_t *virt" "vm_paddr_t start" "vm_paddr_t end" "int prot"
.Fc
.Sh DESCRIPTION
The
.Fn pmap_map
function maps a range of physical addresses into kernel virtual address (KVA)
space, from
.Fa start
to
.Fa end ,
with protection bits
.Fa prot .
.Pp
The value passed in
.Fa *virt
is treated as a hint for the virtual address of the beginning of the mapping.
.Sh IMPLEMENTATION NOTES
The
.Fa prot
argument is currently ignored by machine-dependent implementations.
.Pp
Architectures which can support a direct mapped physical to virtual
region can return the appropriate address within that region, leaving
.Fa *virt
unchanged.
.Sh RETURN VALUES
The
.Fn pmap_map
function returns the virtual address of the beginning of the mapping, if
the mapping was successfully made;
.Fa *virt
will also be updated with the first usable address after the mapped region.
.Pp
If the function is unsuccessful,
.Dv NULL
is returned.
.Sh SEE ALSO
.Xr pmap 9
.Sh AUTHORS
This manual page was written by
.An Bruce M Simpson Aq Mt bms@spc.org .