On seL4, we need to convert untyped memory to page frames before being
able to use it as normal memory. There already exists the hook function
'_export_ds' that is principally suitable for such tasks. It is
currently solely used on Linux where we have to create a file for each
dataspace. To make the hook useful also for seL4, we need to call
_export_ds prior _clear_ds. Otherwise, we would try to clear memory that
is still untyped.
This patch avoids the attempt to extend the cxx-local heap during the
startup phase of an application. Originally, the static part of the cxx
was merely 100 bytes, which did not suffice to run the minimalistic test
roottask on seL4.
If a null-terminated string exactly of length MAX (0 byte included) is
provided, it will be handled as invalid because of wrong string size length
checks.
Commit fixes this.
Discovered during #1486 development.
The thread library (thread.cc) in base-foc shared 95% of the code with
the generic implementation except myself(). Therefore, its
implementation is now separated from the other generic sources into
myself.cc, which allows base-foc to use a foc-specific primitive to
enable our base libraries in L4Linux.
Issue #1491
Physical CPU quota was previously given to a thread on construction only
by directly specifying a percentage of the quota of the according CPU
session. Now, a new thread is given a weighting that can be any value.
The physical counter-value of such a weighting depends on the weightings
of the other threads at the CPU session. Thus, the physical quota of all
threads of a CPU session must be updated when a weighting is added or
removed. This is each time the session creates or destroys a thread.
This commit also adapts the "cpu_quota" test in base-hw accordingly.
Ref #1464
This patch adds const qualifiers to the functions Allocator::consumed,
Allocator::overhead, Allocator::avail, and Range_allocator::valid_addr.
Fixes#1481
* Instead of using local capabilities within core's context area implementation
for stack allocation/attachment, simply do both operations while stack gets
attached, thereby getting rid of the local capabilities in generic code
* In base-hw the UTCB of core's main thread gets mapped directly instead of
constructing a dataspace component out of it and hand over its local
capability
* Remove local capability implementation from all platforms except Linux
Ref #1443
The global capability ID counter is not used by NOVA and Fiasco.OC
and in the future not needed by base-hw too. Thereby, remove the static
counter variable from the generic code base and add it where appropriated.
Ref #1443
Enable platform specific allocations and ram quota accounting for
protection domains. Needed to allocate object identity references
in the base-hw kernel when delegating capabilities via IPC.
Moreover, it can be used to account translation table entries in the
future.
Ref #1443
There are lots of places where a numeric argument of an argument string
gets extraced as signed long value and then assigned to an unsigned long
variable. If the value in the string was negative, it would not be
detected as invalid (and replaced by the default value), but become a
positive bogus value.
With this patch, numeric values which are supposed to be unsigned get
extracted with the 'ulong_value()' function, which returns the default
value for negative numbers.
Fixes#1472
The emergency dataspace is used to accommodate the corner case where
a signal context capability is created while issuing the first
resource request. Normally, the attempt to upgrade the signal-session
quota under such a constrained situation would fail. By freeing the
emergency dataspace in this situation, we regain enough quota to
upgrade the signal session.
This is a follow up commit for "base: Raise RAM quota of signal session
to 16K" and fixes the resource_request test on 64-bit platforms.
The 'Thread_base' class is constructed differently in some special cases
like the main thread or a thread that use a distinct CPU session. The
official API, however, should be clean from such artifacts. Hence, I
separated the official constructor from the other cases.
The port uses the Cortex-A9 private timer for the kernel and an EPIT as
user timer. It was successfully tested on the Wandboard Quad and the CuBox-i
with the signal test. It lacks L2-cache and Trustzone support by now.
Thanks to Praveen Srinivas (IIT Madras, India) and Nikolay Golikov (Ksys Labs
LLC, Russia). This work is partially based on their contributions.
Fix#1467
On base-hw/x86_64 the quota of the signal session is not sufficient due to
the large size of the Signal_session_component. Increasing the quota to
16K avoids signal-context resource exhaustion messages as emmitted by the
run/launcher scenario:
...
Quota exceeded! amount=4096, size=4096, consumed=4096
failed to allocate signal-context resources
upgrading quota donation for signal session
C++ runtime: Genode::Parent::Quota_exceeded
void* abort(): abort called
...
Note: This change increases the quota for all kernels even though it is
strictly only required for base-hw/x86_64.
* Enable the use of the FXSAVE and FXRSTOR instructions, see Intel SDM
Vol. 3C, section 2.5.
* The state of the x87 floating point unit (FPU) is loaded and saved on
demand.
* Make the cr0 control register accessible in the Cpu class. This is in
preparation of the upcoming FPU management.
* Access to the FPU is disabled by setting the Task Switch flag in the cr0
register.
* Access to the FPU is enabled by clearing the Task Switch flag in the cr0
register.
* Implement FPU initialization
* Add is_fpu_enabled helper function
* Add pointer to CPU lazy state to CPU class
* Init FPU when finishing kernel initialization
* Add function to retry FPU instruction:
Similar to the ARM mechanism to retry undefined instructions, implement a
function for retrying an FPU instruction. If a floating-point instruction
causes an #NM exception due to the FPU being disabled, it can be retried
after the correct FPU state is restored, saving the current state and
enabling the FPU in the process.
* Disable FPU when switching to different user context:
This enables lazy save/restore of the FPU since trying to execute a
floating point instruction when the FPU is disabled will cause a #NM
exception.
* Declare constant for #NM exception
* Retry FPU instruction on #NM exception
* Assure alignment of FXSAVE area:
The FXSAVE area is 512-byte memory region that must be 16-byte aligned. As
it turns out the alignment attribute is not honored in all cases so add a
workaround to assure the alignment constraint is met by manually rounding
the start of the FXSAVE area to the next 16-byte boundary if necessary.
The new errcode field is used to store the error code that some
interrupts provide (e.g. #PF). Rework mode transition reserved space and
offset constants to match the new CPU_state layout.
The driver for the Freescale eSDHCv2 doesn't support the highest
available bus frequency by now and also the bus width may be set to a
higher value but that needs further checks on the capabilities of the
inserted card.
The commits provide a benchmark as it exists for the OMAP4 SDHC driver.
Fix#1458
* Introduce hw-specific crt0 for core that calls e.g.: init_main_thread
* re-map core's main thread UTCB to fit the right context area location
* switch core's main thread's stack to fit the right context area location
Fix#1440
