Created futimens.c and utimensat.c to add support for the POSIX
methods futimens() and utimensat().
utime() and utimes() are considered obsolote by POSIX, but RTEMS
will continue to support them.
Closes#4396
Add the BSPs for running on the ZU3EG Ultrascale+ Zynq MPSoC and alter
the option defaults necessary for them to run properly using the
standard BOOT.BIN configured for PetaLinux that comes in the Out-of-Box
package.
Currently, the AArch64 BSPs have a hard time running on real hardware
without building the toolchain and the bsps with -mstrict-align in
multiple places. Configuring the MMU on these chips allows for unaligned
memory accesses for non-device memory which avoids requiring strict
alignment in the toolchain and in the BSPs themselves.
In writing this driver, it was found that the synchronous exception
handling code needed to be rewritten since it relied on clearing SCTLR_EL1 to
avoid thread stack misalignments in RTEMS_DEBUG mode. This is now
avoided by exactly preserving thread mode stack and flags and the new
implementation is compatible with the draft information provided on the
mailing list covering the Exception Management API.
The default available RAM on the A53 BSP is quite small at 8MB. This
bumps that to 128MB to avoid allocation failures in tmcontext01 caused
by large allocations on a cache size of 16MB reported by the system
registers in QEMU.
Move this diagnostic function to a separate file since it does not
provide a core function of the system.
Change license to BSD-2-Clause according to file history and
re-licensing agreement.
Update #3053.
Move clock_nanosleep() to a separate file to avoid a dependency on errno
which pulls in the Newlib reentrancy support. This is an issue since
most parts which are pulled in cannot be garbage collected by the linker
due to the system initialization linker set.
The sizes are configurable via fuses or per software via some registers.
At the moment the registers are not changed. Changing the registers
destroys data stored in the RAM areas (like application code or data).
So either the fuses or some bootloader should be used to set them before
the application starts.
This also adds an OCRAM only linker command file.
Update #4180
The "powerpc/shared/console" code has the start-up console value fixed
at 9600 baud. This changes the hard-wired constant "9600" in the code
to the configuration setting "BSP_CONSOLE_BAUD" and adds configuration
support in both the "waf" and the legacy configuration systems.
Note that the VME BSPs beatnik, mvme3100, and mve5100 can be improved
by adding a "mvmexxxx" BSP family. This configuration change, as well
as future configuration changes, could then be made in a "grp.yml" file.
Move rtems_calloc() since it only depends on rtems_malloc(). This may
make it easier to customize the heap allocator.
Change licence to BSD-2-Clause according to file history.
Update #3053.
Overview
========
The errata is worked around in the kernel without requiring toolchain
modifications. It is triggered the JMPL/RETT return from trap instruction
sequence never generated by the compiler and. There are also other
conditions that must must be true to trigger the errata, for example the
instruction that the trap returns to has to be a JMPL instruction. The
errata can only be triggered if certain data is corrected by ECC
(inflicted by radiation), thus it can not be triggered under normal
operation. For more information see:
www.gaisler.com/notes
Affected RTEMS target BSPs:
* GR712RC
* UT699
* UT700/699E
The work around is enabled by defining __FIX_LEON3_TN0018 at build time.
After applying the following GCC patch, GCC will set the define when
compiling for an affected multilib:
* GR712RC (-mcpu=leon3 -mfix-gr712rc)
* UT700/UT699E (-mpcu=leon3 -mfix-ut700)
* UT699 (-mcpu=leon -mfix-ut699)
When building for another multilib and TN0018 is still required, it
is possible to enable it on the RTEMS kernel configure line using the
TARGET_CFLAGS (-D__FIX_LEON3FT_TN0018) or other by other means.
The following GCC patch sets __FIX_LEON3FT_TN0018 for the affected RTEMS
multilibs:
---------
diff --git a/gcc/config/sparc/rtemself.h b/gcc/config/sparc/rtemself.h
index 6570590..ddec98c 100644
--- a/gcc/config/sparc/rtemself.h
+++ b/gcc/config/sparc/rtemself.h
@@ -33,6 +33,8 @@
builtin_assert ("system=rtems"); \
if (sparc_fix_b2bst) \
builtin_define ("__FIX_LEON3FT_B2BST"); \
+ if (sparc_fix_gr712rc || sparc_fix_ut700 || sparc_fix_ut699) \
+ builtin_define ("__FIX_LEON3FT_TN0018"); \
} \
while (0)
---------
Workaround Implementation
=========================
In general there are two approaches that the workaround uses:
A) avoid ECC restarting the RETT instruction
B) avoid returning from trap to a JMPL instruction
Where A) comes at a higher performance cost than B), so B) is used
where posssible. B) can be achived for certain returns from trap
handlers if trap entry is controlled by assembly, such as system calls.
A)
A special JMPL/RETT sequence where instruction cache is disabled
temporarily to avoid RETT containing ECC errors, and reading of RETT
source registers to "clean" them from incorrect ECC just before RETT
is executed.
B)
The work around prevents JMPL after system calls (TA instruction) and
modifies assembly code on return from traps jumping back to application
code. Note that for some traps the trapped instruction is always
re-executed and can therefore not trigger the errata, for example the
SAVE instruction causing window overflow or an float instruction causing
FPU disabled trap.
RTEMS SPARC traps workaround implementation:
NAME NOTE TRAP COMMENT
* window overflow 1 - 0x05 always returns to a SAVE
* window underflow 1 - 0x06 always returns to a RESTORE
* interrupt traps 2 - 0x10..1f special rett sequence workaround
* syscall 3 - 0x80 shutdown system - never returns
* ABI flush windows 2 - 0x83 special rett sequence workaround
* syscall_irqdis 4 - 0x89
* syscall_irqen 4 - 0x8A
* syscall_irqdis_fp 1 - 0x8B always jumps back to FP instruction
* syscall_lazy_fp_switch 5 - 0x04 A) jumps back to FP instruction, or to
B) _Internal_error() starting with SAVE
Notes:
1) no workaround needed because trap always returns to non-JMPL instruction
2) workaround implemented by special rett sequence
3) no workaround needed because system call never returns
4) workaround implemented by inserting NOP in system call generation. Thus
fall into 1) when workaround is enabled and no trap handler fix needed.
5) trap handler branches into both 1) and returning to _Internal_error()
which starts with a SAVE and besides since it shuts down the system that
RETT should never be in cache (only executed once) so fix not necessary
in this case.
Any custom trap handlers may also have to be updated. To simplify that,
helper work around assembly code in macros are available in a separate
include file <libcpu/grlib-tn-0018.h>.
Close#4155.
Moves drvmgr_drivers[] from amba.c to a separate file in order
to avoid the dependecy on APBUART/GPTIMER drivers. This has
an effect when user configured not to use timer or uart
in their project.
