vmar_unmap - unmap virtual memory pages
#include <zircon/syscalls.h>
zx_status_t zx_vmar_unmap(zx_handle_t vmar_handle,
uintptr_t addr, size_t len);
vmar_unmap() unmaps all VMO mappings and destroys (as if vmar_destroy were called) all sub-regions within the absolute range including addr and ending before exclusively at addr + len. Any sub-region that is in the range must be fully in the range (i.e. partial overlaps are an error). If a mapping is only partially in the range, the mapping is split and the requested portion is unmapped.
If len is not page-aligned, it will be rounded up the next page boundary.
vmar_unmap() returns ZX_OK on success.
ZX_ERR_BAD_HANDLE vmar_handle is not a valid handle.
ZX_ERR_WRONG_TYPE vmar_handle is not a VMAR handle.
ZX_ERR_INVALID_ARGS addr is not page-aligned, len is 0, or the requested range partially overlaps a sub-region.
ZX_ERR_BAD_STATE vmar_handle refers to a destroyed handle.
ZX_ERR_NOT_FOUND Could not find the requested mapping.