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Top Forums Programming help with C++ code that relate the object with physical address Post 302345689 by silviafisica on Thursday 20th of August 2009 02:26:43 AM
Old 08-20-2009
help with C++ code that relate the object with physical address

I need some help to write a C++ code that read and write the register of a sequencer. I have to make a code that relate the objects with the physical address but I am a bit confuse. Could someone suggest me how to proceed? in which parts do I split the code?
thanks
 

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

NAME
pmap_extract, pmap_extract_and_hold -- map a virtual address to a physical page SYNOPSIS
#include <sys/param.h> #include <vm/vm.h> #include <vm/pmap.h> vm_paddr_t pmap_extract(pmap_t pmap, vm_offset_t va); vm_paddr_t pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot); DESCRIPTION
The pmap_extract() function maps a virtual address to a physical page. In certain situations, callers may use pmap_extract_and_hold() instead, to ensure that the returned page is held. The pmap_extract_and_hold() function maps a virtual address to a physical page, and atomically holds the returned page for use by the caller, only if the mapping permits the given page protection. IMPLEMENTATION NOTES
Currently, the page protection requested by the caller is not verified. RETURN VALUES
The pmap_extract() function will return the physical page address associated with the virtual address va inside the physical map pmap. If the mapping does not exist, or if the pmap parameter is NULL, then NULL will be returned. The pmap_extract_and_hold() function will return the physical page address associated with the virtual address va inside the physical map pmap. If the mapping does not exist, the result is a no-op, and NULL will be returned. SEE ALSO
mutex(9), pmap(9) AUTHORS
The pmap_extract_and_hold() function was implemented by Alan L. Cox <alc@imimic.com>. This manual page was written by Bruce M Simpson <bms@spc.org>. BSD
July 21, 2003 BSD
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