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(resource struct {
        iommu handle:IOMMU;
        options uint32;
        bti_id uint64;
    }) -> (resource struct {
        status status;
        out handle:BTI;
    });

    /// 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(resource struct {
        handle handle:BTI;
        options uint32;
        vmo handle:VMO;
        offset uint64;
        size uint64;
    }) -> (resource struct {
        status status;
        addrs vector_paddr;
        pmt handle:PMT;
    });

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