zircon/vdso/pmt.fidl

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
library zx;

@transport("Syscall")
closed protocol Pmt {
    // TODO(https://fxbug.dev/42107929): handle ZX_OBJ_TYPE_PMT; No rights required?
    /// ## Summary
    ///
    /// Unpin pages and revoke device access to them.
    ///
    /// ## Declaration
    ///
    /// ```c
    /// #include <zircon/syscalls.h>
    ///
    /// zx_status_t zx_pmt_unpin(zx_handle_t handle);
    /// ```
    ///
    /// ## Description
    ///
    /// `zx_pmt_unpin()` unpins pages that were previously pinned by [`zx_bti_pin()`],
    /// and revokes the access that was granted by the pin call.
    ///
    /// Always consumes *handle*. It is invalid to use *handle* afterwards, including
    /// to call [`zx_handle_close()`] on it.
    ///
    /// ## Rights
    ///
    /// TODO(https://fxbug.dev/42107318)
    ///
    /// ## Return value
    ///
    /// On success, `zx_pmt_unpin()` returns `ZX_OK`.
    /// In the event of failure, a negative error value is returned.
    ///
    /// ## Errors
    ///
    /// `ZX_ERR_BAD_HANDLE`  *handle* is not a valid handle.
    ///
    /// `ZX_ERR_WRONG_TYPE`  *handle* is not a PMT handle.
    ///
    /// ## See also
    ///
    ///  - [`zx_bti_create()`]
    ///  - [`zx_bti_pin()`]
    ///  - [`zx_bti_release_quarantine()`]
    ///
    /// [`zx_bti_create()`]: bti_create.md
    /// [`zx_bti_pin()`]: bti_pin.md
    /// [`zx_bti_release_quarantine()`]: bti_release_quarantine.md
    /// [`zx_handle_close()`]: handle_close.md
    strict Unpin(resource struct {
        @release
        handle Handle:PMT;
    }) -> () error Status;
};