v_mapphys(D3X)

NAME
     v_mapphys - map physical addresses into user address space

SYNOPSIS
     #include "sys/types.h"
     #include "ksys/ddmap.h"

     v_mapphys(vhandl_ *vt, void *addr, size_t len);

DESCRIPTION
     v_mapphys maps len bytes of the physical hardware addressed by addr into
     a user's address space. The actual user virtual address space to which
     addr is mapped is determined by vt, the "virtual handle" passed to the
     device driver map routine when the user issues a mmap(2) system call.

     If addr refers to memory and addr is either a kseg0 address or a cached
     kseg2 address, addr is mapped as a cached address (that is, all loads and
     stores will access or fill the data cache); otherwise, all references are
     uncached.

RETURN VALUES
     In the event of an error, v_mapphys returns an errno value; otherwise, it
     returns 0.  The errors include:

     [ENOMEM]
          Not enough memory was available to allocate page tables for the
          address space, or the user requested a specific mapping that
          collides with an address space that cannot be unmapped.

SEE ALSO
     v_getaddr(D3X), v_gethandle(D3X), v_getlen(D3X)