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With this patch, init responds to the exit of a child by closing all sessions of the child. E.g., if a child is a GUI application, its nitpicker session is closed at the time of exit, not at the time when the start node disappears from init's configuration. Since this change requires a modification of the 'Genode::Child' class, it takes the chance to make the child-destruction less brutal. The new version ensures that all threads of the destructed subsystem are destructed before other sessions, in particular PD sessions. This eliminates spurious page-fault warnings during the child destruction. On Fiasco.OC, closing the CPU session of a thread while being called by the thread causes a deadlock. Hence, we skip the eager destruction of CPU sessions on this kernel. Related to issue #2659
This is generic part of the Genode implementation. It consists of two parts: :_Core_: is the ultimate root of the Genode application tree and provides abstractions for the lowest-level hardware resources such as RAM, ROM, CPU, and generic device access. All generic parts of Core can be found here - for system-specific implementations refer to the appropriate 'base-<system>' directory. :_Base libraries and protocols_: that are used by each Genode component to interact with other components. This is the glue that holds everything together. _Core_ may export information about the hardware platform by an ROM called 'platform_info'. Depending on the platform, e.g. ARM or x86 or riscv, and depending on the boot mode and boot loader and kernel, some nodes may not be populated. !<platform_info> ! <acpi revision="2" rsdt="0x1fe93074" xsdt="0x1fe930e8"/> ! <boot> ! <framebuffer phys="0x7300000" width="1024" height="768" bpp="32"/> ! </boot> !</platform_info> If the ACPI RSDT and XSDT physical pointer is reported by the used kernel and/or bootloader, _Core_ may provide this information by the ROM. If the graphic device is initialised and can be directly used by a framebuffer driver, _Core_ may provide the physical pointer to the framebuffer, the resolution and color depth in bits.