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/share/man/man9/pmap_map.9

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 1.\"
 2.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
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26.\" $FreeBSD$
27.\"
28.Dd July 21, 2003
29.Dt PMAP_MAP 9
30.Os
31.Sh NAME
32.Nm pmap_map
33.Nd map a physical memory range into kernel virtual address (KVA) space
34.Sh SYNOPSIS
35.In sys/param.h
36.In vm/vm.h
37.In vm/pmap.h
38.Ft vm_offset_t
39.Fo pmap_map
40.Fa "vm_offset_t *virt" "vm_paddr_t start" "vm_paddr_t end" "int prot"
41.Fc
42.Sh DESCRIPTION
43The
44.Fn pmap_map
45function maps a range of physical addresses into kernel virtual address (KVA)
46space, from
47.Fa start
48to
49.Fa end ,
50with protection bits
51.Fa prot .
52.Pp
53The value passed in
54.Fa *virt
55is treated as a hint for the virtual address of the beginning of the mapping.
56.Sh IMPLEMENTATION NOTES
57The
58.Fa prot
59argument is currently ignored by machine-dependent implementations.
60.Pp
61Architectures which can support a direct mapped physical to virtual
62region can return the appropriate address within that region, leaving
63.Fa *virt
64unchanged.
65.Sh RETURN VALUES
66The
67.Fn pmap_map
68function returns the virtual address of the beginning of the mapping, if
69the mapping was successfully made;
70.Fa *virt
71will also be updated with the first usable address after the mapped region.
72.Pp
73If the function is unsuccessful,
74.Dv NULL
75is returned.
76.Sh SEE ALSO
77.Xr pmap 9
78.Sh AUTHORS
79This manual page was written by
80.An Bruce M Simpson Aq bms@spc.org .