vm_map_findspace
- find a free region within a map
SYNOPSIS
#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_map.h> int
Fo vm_map_findspace
Fa vm_map_t map vm_offset_t start vm_size_t length vm_offset_t *addr
Fc
DESCRIPTION
The
vm_map_findspace ();
function attempts to find a region with sufficient space in the
Fa map
for an object of size
Fa length
at the address
Fa addr .
IMPLEMENTATION NOTES
It is the caller's responsibility to obtain a lock on the
Fa map
using
vm_map_lock9
before calling this function.
This routine may call
pmap_growkernel9
to grow the kernel's address space, if and only if the mapping is being
made within the kernel address space, and if insufficient space remains
in the
kernel_map
RETURN VALUES
The
vm_map_findspace ();
function returns the value 0 if successful, and
Fa *addr
will contain the first virtual address in the found region;
otherwise, the value 1 is returned.
