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BSD 2.11 - man page for phys (bsd section 2)

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PHYS(2) 										  PHYS(2)

       phys - allow a process to access physical addresses (2BSD)

       phys(segreg, size, physaddr)
       unsigned int segreg, size, physaddr;

       The  argument  segreg  specifies  a process virtual (data-space) address range of 8K bytes
       starting at virtual address segregx8K bytes.  This address range is mapped  into  physical
       address	physaddrx64  bytes.  Only the first sizex64 bytes of this mapping is addressable.
       If size is zero, any previous mapping of this virtual address  range  is  nullified.   For
       example, the call

	    phys(7, 1, 0177775);

       will  map  virtual  addresses 0160000-0160077 into physical addresses 017777500-017777577.
       In particular, virtual address 0160060 is the PDP-11 console located at	physical  address

       This call may only be executed by the super-user.

       [EPERM]	      The process's effective user ID is not the super-user.

       [EINVAL]       Segreg is less than 0 or greater than 7.

       [EINVAL]       Size is less than 0 or greater than 128.

       PDP-11 segmentation hardware

       On systems with ENABLE/34(tm) memory mapping boards, phys cannot be used to map in the I/O

       This system call is very dangerous.  It is not considered a permanent part of the system.

       Phys is unique to the PDP-11 and 2BSD; its use is discouraged.

3rd Berkeley Distribution		 January 22, 1987				  PHYS(2)
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