Instead of mapping all physical memory 1:1 into core/kernel's address space,
this commit limits the 1:1 mapping to the binary image, and I/O memory
regions used by the kernel only. All subsequent memory accesses of core
are done by mapping the corresponding memory on demand, and not necessarily
1:1.
This commit has several side effects:
The page table code had to be revisited completely. The kernel inserts no
longer anything into the page tables, apart from the initial translations
to have the core/kernel image available when enabling the MMU. The page
tables and higher level translation tables are no longer named Tlb, but
Translation_table instead. There is no indirection class required to define
the translation tables of a concrete SoC, the appropriated ARM specifier
is sufficient.
The ability to map core's memory the same way like it's done for all other
protection domains, makes a special treatment of core's threads (no context
area) obsolete.
Ref #567 (partly solves it)
Fix#723Fix#1068
Removes the generic processor broadcast function call. By now, that call
was used for cross processor TLB maintance operations only. When core/kernel
gets its memory mapped on demand, and unmapped again, the previous cross
processor flush routine doesn't work anymore, because of a hen-egg problem.
The previous cross processor broadcast is realized using a thread constructed
by core running on top of each processor core. When constructing threads in
core, a dataspace for its thread context is constructed. Each constructed
RAM dataspace gets attached, zeroed out, and detached again. The detach
routine requires a TLB flush operation executed on each processor core.
Instead of executing a thread on each processor core, now a thread waiting
for a global TLB flush is removed from the scheduler queue, and gets attached
to a TLB flush queue of each processor. The processor local queue gets checked
whenever the kernel is entered. The last processor, which executed the TLB
flush, re-attaches the blocked thread to its scheduler queue again.
To ease uo the above described mechanism, a platform thread is now directly
associated with a platform pd object, instead of just associate it with the
kernel pd's id.
Ref #723
It covers bugs which we should detect and fix, especially depending on
the result of pthread_myself locking implementation (ours and vbox) takes
decision to take a lock or just to assume it is a reentrant locking attempt.
Fixes#1128
The pointer-report facility used to report the screen-absolute position
of the mouse pointer. For nitpicker clients, however, this position is
meaningless because their coordinate is always constrained to the area
below the menu bar. This patch offsets the reported position
accordingly.
The rm_session quota of the context area is not sufficient to start more
then ~95 threads per address space. If one really needs so many threads per
address space one could increase the quota or dynamically respond to it using
the Expanding_rm_session class. Until now there is no need to support so much
threads per address space.
Issue #1122
By separating the VFS from Noux, we become able to reuse the
VFS for libc-using programs. The most substantial change is the
removal of Noux::Sysio data structures from the VFS. Instead, the
Noux::Sysio refers to the VFS types now.
The new VFS library is located at 'os/include/vfs/'.
Furthermore, the patch removes various code duplications related
to pseudo file systems that provide a single file (block, zero,
random, terminal, null). The new 'Single_file_system' holds the
common boilerplate code for those.
Issue #999
Until now, there was not exception type for the condition where a
symlink was created on a file system w/o supporting symlinks, e.g., FAT.
The corresponding file-system server (ffat_fs) used to return a negative
handle as a work around. I added 'Permission_denied' to the list of
exceptions thrown by 'File_system::Session::symlink' to handle this case
in a clean way.
Genode's file system interface returns the number of directories
multiplied by sizeof(Directory_entry) as size of a directory. The
tar_fs server used to return zero. The fix counts the sub nodes of
the given directory.
The test used to rely on a writable root directory. To reuse the test
for the new VFS, where '/' is never writable, I changed all absolute
paths to relative paths.
By introducing the new 'File_system_registry', we can remove the
knowledge about the actual file-system implementations from the
'Dir_file_system'. Thereby the code becomes more generic, which is
a precondition for using it as the basis for Genode's VFS library.
Issue #999
* Perform sanity check before calculating memory available to rump kernel
* Distinguish between 'Hard_context' and 'Hard_context_thread', so no dead
threads (that will not be started) are created
* Install signal-handler for memory-resource requests. This way the fs server
will not block forever when the quota is execeeded and a resource requests
fails, leaving the rump kernels to perform necessary actions
Fixes#1127
The version string was generated when core/main.cc was rebuilt, which
happens on changes in the file itself or in a header file it includes.
But, the version should reflect if the Genode repository was changed at
any place. Therefore, I moved the version string to its own version.cc
which is forcedly rebuilt any time core is examined by the build system.
@nfeske what do you think about it? Core is now relinked on any build.
Fixes#551.
Turn Genode user-level spinlock into a user-level "helpinglock". This requires
support by the kernel introduced with kernel branch r5.
The commit avoids live-locks when multiple threads with SCs on different
priority levels compete for the same user-level Genode "spinlock".
Issue #986
