zircon/vdso/vmar.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;

alias VmOption = uint32;

// TODO(scottmg): bits for ZX_VM_xyz flags, and const for ZX_VM_ALIGN_xyz.

[Transport = "Syscall"]
protocol vmar {
    /// Allocate a new subregion.
    /// Rights: If options & ZX_VM_CAN_MAP_READ, parent_vmar must be of type ZX_OBJ_TYPE_VMAR and have ZX_RIGHT_READ.
    /// Rights: If options & ZX_VM_CAN_MAP_WRITE, parent_vmar must be of type ZX_OBJ_TYPE_VMAR and have ZX_RIGHT_WRITE.
    /// Rights: If options & ZX_VM_CAN_MAP_EXECUTE, parent_vmar must be of type ZX_OBJ_TYPE_VMAR and have ZX_RIGHT_EXECUTE.
    vmar_allocate(handle:VMAR parent_vmar, VmOption options, usize offset, usize size)
        -> (status status, handle:VMAR child_vmar, vaddr child_addr);

    // TODO(fxbug.dev/32803): handle No rights required?
    /// Destroy a virtual memory address region.
    vmar_destroy(handle:VMAR handle) -> (status status);

    // TODO(fxbug.dev/32253): TODO handle and vmo and options must all match, and options can't specify them.
    /// Add a memory mapping.
    /// Rights: handle must be of type ZX_OBJ_TYPE_VMAR.
    /// Rights: vmo must be of type ZX_OBJ_TYPE_VMO.
    vmar_map(handle:VMAR handle, VmOption options, usize vmar_offset,
             handle:VMO vmo, uint64 vmo_offset,
             usize len)
        -> (status status, vaddr mapped_addr);

    // TODO(fxbug.dev/32803): handle No rights required?
    /// Unmap virtual memory pages.
    vmar_unmap(handle:VMO handle, vaddr addr, usize len) -> (status status);

    /// Set protection of virtual memory pages.
    /// Rights: If options & ZX_VM_PERM_READ, handle must be of type ZX_OBJ_TYPE_VMAR and have ZX_RIGHT_READ.
    /// Rights: If options & ZX_VM_PERM_WRITE, handle must be of type ZX_OBJ_TYPE_VMAR and have ZX_RIGHT_WRITE.
    /// Rights: If options & ZX_VM_PERM_EXECUTE, handle must be of type ZX_OBJ_TYPE_VMAR and have ZX_RIGHT_EXECUTE.
    vmar_protect(handle:VMO handle, VmOption options, vaddr addr, usize len) -> (status status);

    /// Perform an operation on VMOs mapped into this VMAR.
    /// Rights: If op is ZX_VMO_OP_DECOMMIT, affected mappings must be writable.
    [Blocking]
    vmar_op_range(handle:VMAR handle,
                  uint32 op,
                  vaddr address,
                  usize size,
                  mutable_vector_void buffer)
        -> (status status);
};