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There are hardware timers whose frequency can't be expressed as ticks-per-microsecond integer-value because only a ticks-per-millisecond integer-value is precise enough. We don't want to use expensive floating-point values here but nonetheless want to translate from ticks to time with microseconds precision. Thus, we split the input in two and translate both parts separately. This way, we can raise precision by shifting the values to their optimal bit position. Afterwards, the results are shifted back and merged together again. As this algorithm is not so trivial anymore and used by at least three timer drivers (base-hw/x86_64, base-hw/cortex_a9, timer/pit), move it to a generic header to avoid redundancy. Ref #2400 |
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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.