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(resource struct {
        parent_vmar handle:VMAR;
        options VmOption;
        offset usize;
        size usize;
    }) -> (resource struct {
        status status;
        child_vmar handle:VMAR;
        child_addr vaddr;
    });

    // TODO(fxbug.dev/32803): handle No rights required?
    /// Destroy a virtual memory address region.
    vmar_destroy(resource struct {
        handle handle:VMAR;
    }) -> (struct {
        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(resource struct {
        handle handle:VMAR;
        options VmOption;
        vmar_offset usize;
        vmo handle:VMO;
        vmo_offset uint64;
        len usize;
    }) -> (struct {
        status status;
        mapped_addr vaddr;
    });

    // TODO(fxbug.dev/32803): handle No rights required?
    /// Unmap virtual memory pages.
    vmar_unmap(resource struct {
        handle handle:VMAR;
        addr vaddr;
        len usize;
    }) -> (struct {
        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(resource struct {
        handle handle:VMAR;
        options VmOption;
        addr vaddr;
        len usize;
    }) -> (struct {
        status status;
    });

    /// Perform an operation on VMOs mapped into this VMAR.
    /// Rights: If op is ZX_VMAR_OP_DECOMMIT, handle must have ZX_RIGHT_WRITE.
    /// Rights: If op is ZX_VMAR_OP_COMMIT, handle must have ZX_RIGHT_WRITE.
    vmar_op_range(resource struct {
        handle handle:VMAR;
        op uint32;
        address vaddr;
        size usize;
        buffer mutable_vector_void;
    }) -> (struct {
        status status;
    });
};