pmap_map
- map a physical memory range into kernel virtual address (KVA) space
SYNOPSIS
#include <sys/param.h>
#include <vm/vm.h>
#include <vm/pmap.h> vm_offset_t
Fo pmap_map
Fa vm_offset_t *virt vm_paddr_t start vm_paddr_t end int prot
Fc
DESCRIPTION
The
pmap_map ();
function maps a range of physical addresses into kernel virtual address (KVA)
space, from
Fa start
to
Fa end ,
with protection bits
Fa prot .
The value passed in
Fa *virt
is treated as a hint for the virtual address of the beginning of the mapping.
IMPLEMENTATION NOTES
The
Fa prot
argument is currently ignored by machine-dependent implementations.
Architectures which can support a direct mapped physical to virtual
region can return the appropriate address within that region, leaving
Fa *virt
unchanged.
RETURN VALUES
The
pmap_map ();
function returns the virtual address of the beginning of the mapping, if
the mapping was successfully made;
Fa *virt
will also be updated with the first usable address after the mapped region.
If the function is unsuccessful,
NULL
is returned.
