zircon/vdso/bti.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"]
protocol bti {
    /// Create a new bus transaction initiator.
    /// Rights: iommu must be of type ZX_OBJ_TYPE_IOMMU and have ZX_RIGHT_NONE.
    // TODO(fxbug.dev/32803): This is an unusual rights spec.
    bti_create(handle:IOMMU iommu, uint32 options, uint64 bti_id) -> (status status, handle:BTI out);

    /// Pin pages and grant devices access to them.
    /// Rights: handle must be of type ZX_OBJ_TYPE_BTI and have ZX_RIGHT_MAP.
    /// Rights: vmo must be of type ZX_OBJ_TYPE_VMO and have ZX_RIGHT_MAP.
    /// Rights: If options & ZX_BTI_PERM_READ, vmo must be of type ZX_OBJ_TYPE_VMO and have ZX_RIGHT_READ.
    /// Rights: If options & ZX_BTI_PERM_WRITE, vmo must be of type ZX_OBJ_TYPE_VMO and have ZX_RIGHT_WRITE.
    /// Rights: If options & ZX_BTI_PERM_EXECUTE, vmo must be of type ZX_OBJ_TYPE_VMO and have ZX_RIGHT_READ.
    // READ is intentional in the EXECUTE condition.
    bti_pin(handle:BTI handle,
            uint32 options,
            handle:VMO vmo,
            uint64 offset,
            uint64 size)
        -> (status status, vector_paddr addrs, handle:PMT pmt);

    /// Releases all quarantined PMTs.
    /// Rights: handle must be of type ZX_OBJ_TYPE_BTI and have ZX_RIGHT_WRITE.
    bti_release_quarantine(handle:BTI handle) -> (status status);
};