Commit Graph

14 Commits

Author SHA1 Message Date
Stefan Kalkowski
8e13b376b0 hw: improve cross-cpu synchronization
This commit addresses several multiprocessing issues in base-hw:

* it reworks cross-cpu maintainance work for TLB invalidation by
  introducing a generic Inter_processor_work and removes the so
  called Cpu_domain_update
* thereby it solves the cross-cpu thread destruction, when the
  corresponding thread is active on another cpu (fix #3043)
* it adds the missing TLB shootdown for x86 (fix #3042)
* on ARM it removes the TLB shootdown via IPIs, because this
  is not needed on the multiprocessing ARM platforms we support
* it enables the per-cpu initialization of the kernel's cpu
  objects, which means those object initialization is executed
  by the proper cpu
* it rollbacks prior decision to make multiprocessing an aspect,
  but puts back certain 'smp' mechanisms (like cross-cpu lock)
  into the generic code base for simplicity reasons
2019-01-07 12:25:44 +01:00
Stefan Kalkowski
ca60e24ad9 hw: run core threads in privileged mode
* introduce new syscall (core-only) to create privileged threads
* take the privilege level of the thread into account
  when doing a context switch
* map kernel segment as accessable for privileged code only

Ref #2091
2017-10-19 13:31:17 +02:00
Martin Stein
4d3d4ecca0 hw core: merge Kernel::Clock and Kernel::Timer
With this, we get rid of platform specific timer interfaces. The new
Timer class does the same as the old Clock class and has a generic
interface. The old Timer class was merely used by the old Clock class.
Also, we get rid of having only one timer instance which we tell with
each method call for which CPU it shall be done. Instead now each Cpu
object has its own Timer member that knows the CPU it works for.

Also, rename all "tics" to "ticks".

Fixes #2347
2017-05-31 13:16:10 +02:00
Stefan Kalkowski
b9549e58d0 hw: cleanup core code (Ref #2394) 2017-05-31 13:15:53 +02:00
Stefan Kalkowski
67ba7b89a7 hw: separate bootstrap and core strictly
* Introduce Hw namespace and library files under src/lib/hw
* Introduce Bootstrap namespace
* Move all initialization logic into Bootstrap namespace

Ref #2388
2017-05-31 13:15:52 +02:00
Norman Feske
29b8d609c9 Adjust file headers to refer to the AGPLv3 2017-02-28 12:59:29 +01:00
Stefan Kalkowski
cf943dac65 hw: bootstrap into kernel
Put the initialization of the cpu cores, setup of page-tables, enabling of
MMU and caches into a separate component that is only used to bootstrap
the kernel resp. core.

Ref #2092
2017-02-23 14:54:42 +01:00
Stefan Kalkowski
7aff1895bf hw: enable SMP for ARM Cortex A9
This commit enables multi-processing for all Cortex A9 SoCs we currently
support. Moreover, it thereby enables the L2 cache for i.MX6 that was not
enabled until now. However, the QEMU variants hw_pbxa9 and hw_zynq still
only use 1 core, because the busy cpu synchronization used when initializing
multiple Cortex A9 cores leads to horrible boot times on QEMU.

During this work the CPU initialization in general was reworked. From now
on lots of hardware specifics were put into the 'spec' specific files, some
generic hook functions and abstractions thereby were eliminated. This
results to more lean implementations for instance on non-SMP platforms,
or in the x86 case where cache maintainance is a non-issue.

Due to the fact that memory/cache coherency and SMP are closely coupled
on ARM Cortex A9 this commit combines so different aspects.

Fix #1312
Fix #1807
2016-01-26 16:20:18 +01:00
Stefan Kalkowski
e05d26567d hw: make 'smp' property an aspect (Ref #1312)
This commit separates certain SMP aspects into 'spec/smp' subdirectories.
Thereby it simplifies non-SMP implementations again, where no locking
and several platform specific maintainance operations are not needed.
Moreover, it moves several platform specifics to appropriated places,
removes dead code from x86, and starts to turn global static pointers
into references that are handed over.
2016-01-15 16:42:12 +01:00
Stefan Kalkowski
6552d47e60 hw: eliminate missing references for consts
Fix #1606
2015-07-01 14:46:16 +02:00
Stefan Kalkowski
cc58b11998 hw: replace page table allocator with static one
Instead of organizing page tables within slab blocks and allocating such
blocks dynamically on demand, replace the page table allocator with a
simple, static alternative. The new page table allocator is dimensioned
at compile-time. When a PD runs out of page-tables, we simply flush its
current mappings, and re-use the freed tables. The only exception is
core/kernel that should not produce any page faults. Thereby it has to
be ensured that core has enough page tables to populate it's virtual
memory.

A positive side-effect of this static approach is that the accounting
of memory used for page-tables is now possible again. In the dynamic case
there was no protocol existent that solved the problem of donating memory
to core during a page fault.

Fix #1588
2015-06-22 14:43:41 +02:00
Stefan Kalkowski
e081554731 hw: kernel backed capabilities (Fix #1443) 2015-05-26 09:40:04 +02:00
Stefan Kalkowski
7582396e9c hw_arndale: enable ARM virtualization extensions
* enables world-switch using ARM virtualization extensions
* split TrustZone and virtualization extensions hardly from platforms,
  where it is not used
* extend 'Vm_session' interface to enable configuration of guest-physical memory
* introduce VM destruction syscall
* add virtual machine monitor for hw_arndale that emulates a simplified version
  of ARM's Versatile Express Cortex A15 board for a Linux guest OS

Fixes #1405
2015-02-27 11:48:05 +01:00
Martin Stein
5dea0b40aa hw: don't use ARM CPU-state stuff in generic code
Fixes #1404
2015-02-16 13:40:36 +01:00