The Design and Implementation of the Anykernel and Rump Kernels

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3.8 Attaching Components . ........................ 124
3.8.1 Kernel Modules ......................... 124
3.8.2 Modules: Loading and Linking ................ 127
3.8.3 Modules: Supporting Standard Binaries ........... 131
3.8.4 RumpComponentInitRoutines................ 136
3.9 I/OBackends .............................. 139
3.9.1 Networking ........................... 139
3.9.2 DiskDriver ........................... 145
3.10HardwareDeviceDrivers:ACaseofUSB .............. 149
3.10.1 StructureofUSB........................ 149
3.10.2 Defining Device Relations with Config ............ 150
3.10.3 DMAandUSB ......................... 153
3.10.4 USB Hubs ............................ 155
3.11MicrokernelServers:CaseStudywithFileServers.......... 158
3.11.1 Mount Utilities and File Servers ................ 159
3.11.2 Requests:Thep2kLibrary................... 160
3.11.3 Unmounting ........................... 162
3.12RemoteClients ............................. 162
3.12.1 Client-KernelLocators..................... 164
3.12.2 TheClient............................ 164
3.12.3 TheServer............................ 165
3.12.4 CommunicationProtocol.................... 167
3.12.5 Of Processes and Inheritance ................. 168
3.12.6 SystemCallHijacking ..................... 172
3.12.7 A Tale of Two Syscalls: fork() and execve() ........ 177
3.12.8 Performance........................... 180
3.13 Summary ................................ 182
4 Evaluation 185
4.1 Feasibility ................................ 185