Unmap virtual memory pages.
#include <zircon/syscalls.h> zx_status_t zx_vmar_unmap(zx_handle_t handle, zx_vaddr_t addr, size_t len);
zx_vmar_unmap() unmaps all VMO mappings and destroys (as if
zx_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.
len must be page-aligned.
zx_vmar_unmap() returns ZX_OK on success.
ZX_ERR_BAD_HANDLE handle is not a valid handle.
ZX_ERR_WRONG_TYPE handle is not a VMAR handle.
ZX_ERR_INVALID_ARGS addr is not page-aligned, len is 0 or not page-aligned, or the requested range partially overlaps a sub-region.
ZX_ERR_BAD_STATE handle refers to a destroyed handle.
ZX_ERR_NOT_FOUND Could not find the requested mapping.