PHYS(2)

NAME
       phys  -  allow a process to access physical addresses [NOT
       IMPLEMENTED]

SYNOPSIS
       int phys(int physnum, char *virtaddr, long size,
       char *physaddr);

DESCRIPTION
       WARNING: Since this function  is  not  implemented  as  of
       Linux  0.99.11,  it will always return -1 and set errno to
       ENOSYS.

       phys maps arbitrary physical memory into a process's  vir-
       tual  address space.  physnum is  number (0-3) that speci-
       fies which of the 4 physical spaces to set up.   Up  to  4
       phys calls can be active at any one time.  virtaddr is the
       process's virtual address.  size is the number of bytes to
       map in.  physaddr is the physical address to map in.

       Valid  virtaddr  and  physaddr  values  are constrained by
       hardware and must be at an address multiple of the resolu-
       tion  of  the  CPU's memory management scheme.  If size is
       non zero, size is rounded up to the  next  MMU  resolution
       boundary.   If  size is zero, any previous phys(2) mapping
       for that physnum is nullified.

RETURN VALUE
       On success, zero is returned.  On error, -1  is  returned,
       and errno is set appropriately.

CONFORMING TO
       Version 7.

BUGS
       phys is very machine dependent.

SEE ALSO
       mmap(2) munmap(2)