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Per Affinity::Location a system control cap can be requested. The capability provides an RPC interface to request and set Cpu_state, as provided by the former Pd::managing_system(Cpu_state) method. Invocation of those system control capabilities then *can* (see below) be executed on the desired CPU as described by Affinity::Location. The system control cap will be invalid for kernels that don't support system_control/managing_system functionality at all. The system control cap will be ever by the same, e.g. ignoring the Affinity::Location parameter, if the used kernel doesn't support or doesn't require the feature to execute the system control per CPU. The commit is a preparation step to add guarded and selective x86 MSR access per CPU. Fixes #5009
This is the generic Genode base system, which consists of two parts: :_Core_: is the root of the Genode component tree. It provides abstractions for the lowest-level hardware resources such as RAM, ROM, CPU, and device access. All generic parts of core can be found here. For kernel-specific parts, refer to the appropriate 'base-<kernel>' directory. :_Base libraries and interfaces: that are used by each Genode component to interact with other components. This is the glue that holds everything together. Depending on the used kernel, core may export information about the hardware platform as a ROM called 'platform_info'. For example, if the ACPI RSDT and XSDT physical pointer are reported by the used kernel and/or bootloader, core provides this information in the ROM as follows. !<platform_info> ! <acpi revision="2" rsdt="0x1fe93074" xsdt="0x1fe930e8"/> ! <boot> ! <framebuffer phys="0x7300000" width="1024" height="768" bpp="32"/> ! </boot> !</platform_info> If the graphics device is initialised and can be directly used by a framebuffer driver, core provides the physical pointer to the framebuffer, the resolution, and color depth in bits.