[Vm-dev] ARM Cogit

Wed Apr 22 18:52:04 UTC 2015

> On 22 Apr 2015, at 14:42, Eliot Miranda <eliot.miranda at gmail.com> wrote:

Hi,

>     thanks to hard work by Tim Rowledge and Lars Wasserman we now have a functional JIT for the ARM in the simulator.  We're still probably some weeks away from a functional ARM JIT VM; issues like instruction cache flushing on real hardware can be tricky to solve.  But we're at least ready to start trying to compile the JIT VM for ARM.  Doug, see that I added a build directory for build.linux32ARM/squeak.cog.spur.  Hopefully a fast VM for Raspberry Pi and Android is only a few weeks away.

tricky in which sense? The Linux kernel offers a syscall (cacheflush) where one
provides the start page and end page and GCC provides a builtin function for this
as well (__clear_cache).

holger

cache flush:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/arm/kernel/traps.c?id=9ea18f8cab5f1c36cdd0f09717e35ceb48c36a87#n611