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.Dd July 21, 2003
.Dt PMAP_COPY 9
.Os
.Sh NAME
.Nm pmap_copy ,
.Nm pmap_copy_page
.Nd copy physical memory pages
.Sh SYNOPSIS
.In sys/param.h
.In vm/vm.h
.In vm/pmap.h
.Ft void
.Fo pmap_copy
.Fa "pmap_t dst_pmap" "pmap_t src_pmap" "vm_offset_t dst_addr"
.Fa "vm_size_t len" "vm_offset_t src_addr"
.Fc
.Ft void
.Fn pmap_copy_page "vm_page_t src" "vm_page_t dst"
.Sh DESCRIPTION
The
.Fn pmap_copy
function copies the range specified by
.Fa src_addr
and
.Fa len
from the source physical map
.Fa src_pmap
to the destination physical map
.Fa dst_pmap
at the address
.Fa dst_addr .
.Pp
The
.Fn pmap_copy_page
function
copies the physical page
.Fa src
to the physical page
.Fa dst ,
by mapping the page into kernel virtual address space (KVA), and using
.Fn bcopy
to copy the page.
.Sh IMPLEMENTATION NOTES
The
.Fn pmap_copy
routine is only advisory and need not do anything.
Actually implementing it may seriously reduce system performance.
.Pp
The
.Fn pmap_copy_page
routine only operates upon a single page.
.Sh SEE ALSO
.Xr bcopy 3 ,
.Xr pmap 9
.Sh AUTHORS
This manual page was written by
.An Bruce M Simpson Aq bms@spc.org .