freebsd man page for pmap_copy

PMAP_COPY(9)						   BSD Kernel Developer's Manual					      PMAP_COPY(9)

NAME
     pmap_copy, pmap_copy_page -- copy physical memory pages

SYNOPSIS
     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/pmap.h>

     void
     pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, vm_size_t len, vm_offset_t src_addr);

     void
     pmap_copy_page(vm_page_t src, vm_page_t dst);

DESCRIPTION
     The pmap_copy() function copies the range specified by src_addr and len from the source physical map src_pmap to the destination physical map
     dst_pmap at the address dst_addr.

     The pmap_copy_page() function copies the physical page src to the physical page dst, by mapping the page into kernel virtual address space
     (KVA), and using bcopy() to copy the page.

IMPLEMENTATION NOTES
     The pmap_copy() routine is only advisory and need not do anything.  Actually implementing it may seriously reduce system performance.

     The pmap_copy_page() routine only operates upon a single page.

SEE ALSO
     bcopy(3), pmap(9)

AUTHORS
     This manual page was written by Bruce M Simpson <bms@spc.org>.

BSD
								   July 21, 2003							       BSD