Qemu stm3211/13/2023 ![]() ![]() RISC-V: additional ISA and Extension support for smstateen, nativeĭebug icount trigger, cache-related PMU events in virtual mode,.HPPA: fid (Floating-Point Identify) instruction support and 32-bit.ARM: gdbstub support for M-profile system registers.ARM: CPU emulation for Cortex-A55 and Cortex-R52, and new Olimex.ARM: emulation support for FEAT_EVT, FEAT_FGT, and AArch32 ARMv8-R.The full list of changes are available in the changelog. You can grab the tarball from our download page. This release contains 2800+ commits from 238 authors. This is basically a formalized version of the concepts described above, to make it easier for one device to tell another "my clock rate is 20MHz now" without hacks like the "system_clock_scale" global variable or ad-hoc QOM properties.We’d like to announce the availability of the QEMU 8.0.0 release. Update as of 2020: QEMU now has some API and infrastructure for modelling clock trees, which is documented in docs/devel/clocks.rst in the source tree. In general QEMU's philosophy is "run guest code as fast as we can", and we don't make any attempt at anything approaching cycle-accurate or otherwise tightly timed emulation. ![]() You can use the -icount option to specify that you want the CPU to run at a particular rate relative to real time, which sort of implicitly sets the 'cpu frequency', but this will only sort of roughly set an average - some instructions will run much faster than others, in a not very predictable way. By default QEMU CPUs will run "as fast as possible". None of this affects the speed of the emulated QEMU CPU (ie how many instructions it executes in a given time period). ![]() The system_clock_scale global is clunky but works. The 1MHz is just a silly hardcoded value that nobody has yet bothered to improve upon, because we haven't run into guest code that cares yet. (The system_clock_scale global should be set to NANOSECONDS_PER_SECOND / clk_frq_in_hz.)
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