| // Copyright 2021 The Fuchsia Authors |
| // |
| // Use of this source code is governed by a MIT-style |
| // license that can be found in the LICENSE file or at |
| // https://opensource.org/licenses/MIT |
| |
| #ifndef ZIRCON_KERNEL_LIB_INSTRUMENTATION_KERNEL_MAPPED_VMO_H_ |
| #define ZIRCON_KERNEL_LIB_INSTRUMENTATION_KERNEL_MAPPED_VMO_H_ |
| |
| #include <ktl/string_view.h> |
| #include <vm/pinned_vm_object.h> |
| #include <vm/vm_address_region.h> |
| |
| class Handle; |
| |
| // This maintains a kernel mapping from a VMO; mapped pages must stay pinned to |
| // prevent kernel-mode page faults. Destroying this object unmaps and unpins. |
| class KernelMappedVmo { |
| public: |
| ~KernelMappedVmo(); |
| |
| // Initialize with a kernel mapping from the VMO. |
| zx_status_t Init(fbl::RefPtr<VmObject> vmo, size_t offset, size_t size, const char* name); |
| |
| // Publish this VMO to userland as a read-only handle using the given name |
| // and content size. |
| Handle* Publish(ktl::string_view vmo_name, size_t content_size); |
| |
| // Return the bounds of the mapping in the kernel address space. |
| vaddr_t base() const { return mapping_->base(); } |
| size_t size() const { return mapping_->size(); } |
| |
| private: |
| PinnedVmObject pinned_vmo_; |
| fbl::RefPtr<VmMapping> mapping_; |
| }; |
| |
| #endif // ZIRCON_KERNEL_LIB_INSTRUMENTATION_KERNEL_MAPPED_VMO_H_ |