27 Feb, 2013
3 commits
-
Signed-off-by: Vineet Gupta
-
The upstream kernel ABI (v3) is different from current out-of-tree (v2):
* no-legacy-syscalls
* user_regs_struct layout has changedSo we rev up the ABI version
Signed-off-by: Vineet Gupta
-
ptrace regset interface relies on ELF_NGREG for ceiling the size of user
request. So any larger request (even if legit) would be clipped.The existing def of ELF_NGREG didn't use user_regs_struct and was
technically one placeholder short (stop_pc) - although the current code
would still work because pt_regs includes a bunch of extra fields,
making
ELF_NGREG >= sizeof(struct user_regs_struct)/sizeof(long)But we need to remove this ambiguity, specially since pt_regs should NOT
be directly associated with with anything userspace-ish.Signed-off-by: Vineet Gupta
26 Feb, 2013
2 commits
-
Since ARC port was not yet upstream, we missed a bunch of cross-arch
Kconfig removals:* GENERIC_SIGALTSTACK: d64008a8f3 "burying unused conditionals"
* HAVE_IRQ_WORK: 6147a9d807 "irq_work: Remove CONFIG_HAVE_IRQ_WORK"
* ARCH_NO_VIRT_TO_BUS: e0cf2ef484 "arch Kconfig: centralise
CONFIG_ARCH_NO_VIRT_TO_BUS"Signed-off-by: Vineet Gupta
-
The flat DT (currently embedded in vmlinux) is in .init section.
The unflattened/binary tree doesn't copy strings through and references
them from orig flat DT - which could cause catestrohpy if of_* APIs are
called post init, say from a driver which is a loadable module.Reported-by: James Hogan
Signed-off-by: Vineet Gupta
16 Feb, 2013
35 commits
-
Per Grant's review comment - driver changes via tty tree
Signed-off-by: Vineet Gupta
-
Signed-off-by: Vineet Gupta
Reported-by: James Hogan -
Syscall restarting fixes made pt_regs->orig_r8 a short word, which was
not reflected in the assembler code - thus could potentially break gdb
debugging.Signed-off-by: Vineet Gupta
-
Commit 0bbacca "hlist: drop the node parameter from iterators" changed
the iterator across the board - but ARC port being out-of-tree missed
it.Signed-off-by: Vineet Gupta
-
The 64bit RTSC is not reliable, causing spurious "jumps" in higher word,
making Linux timekeeping go bonkers. So as of now just use the lower
32bit timestamp.A cleaner approach would have been removing RTSC support altogether as the
32bit RTSC is equivalent to old TIMER1 based solution, but some customers
can use the 32bit RTSC in SMP syn fashion (vs. TIMER1 which being incore
can't be done easily).A fallout of this is sched_clock()'s hardware assisted version needs to
go away since it can't use 32bit wrapping counter - instead we use the
generic "weak" jiffies based version.Signed-off-by: Vineet Gupta
-
!CONFIG_ARC_HAS_(I|D)CACHE makes Linux disable caches (assuming they
exist in hardware) - mostly for debugging issues with new peripherals.
However, independent of CONFIG_ARC_HAS_(I|D)CACHE, Linux also needs to
handle, non-existant caches, using the information in Cache BCRs (Build
Configuration Reg)Reported-by: Alexey Brodkin
Signed-off-by: Vineet Gupta -
Signed-off-by: Vineet Gupta
-
Signed-off-by: Vineet Gupta
-
Platforms export their SMP callbacks by populating arc_smp_ops.
The population itself needs to be done pretty early, from init_early
callback.Signed-off-by: Vineet Gupta
Cc: Arnd Bergmann -
This again is for switch from singleton platform SMP API to
multi-platform paradigmPlatform code is not yet setup to populate the callbacks, that happens
in next commitSigned-off-by: Vineet Gupta
Cc: Arnd Bergmann
Acked-by: Arnd Bergmann -
All the current platforms can work with 0x8000_0000 based dma_addr_t
since the Bus Bridges typically ignore the top bit (the only excpetion
was Angel4 PCI-AHB bridge which we no longer care for).
That way we don't need plat-specific cpu-addr to bus-addr conversion.Hooks still provided - just in case a platform has an obscure device
which say needs 0 based bus address.That way no longer needs to unconditinally include
Also verfied that on Angel4 board, other peripherals (IDE-disk / EMAC)
work fine with 0x8000_0000 based dma addresses.Signed-off-by: Vineet Gupta
Cc: Arnd Bergmann
Acked-by: Arnd Bergmann -
For now this will suffice for all platforms, later exotic ones needs to
get this from DeviceTreeSigned-off-by: Vineet Gupta
Cc: Arnd Bergmann -
-Top level ARC makefile removes -I for platform headers
-asm/irq.h no longer includes plat/irq.h-platform makefile adds -I for it's specfic platform headers
-platform code to directly include it's plat/irq.h-Linker script needed plat/memmap.h for CCM info, already in .config
Signed-off-by: Vineet Gupta
Cc: Arnd Bergmann
Acked-by: Arnd Bergmann -
-platform API is retired and instead callbacks are used
Signed-off-by: Vineet Gupta
Cc: Arnd Bergmann
Acked-by: Arnd Bergmann -
The orig platform code orgnaization was singleton design pattern - only
one platform (and board thereof) would build at a time.Thus any platform/board specific code (e.g. irq init, early init ...)
expected by ARC common code was exported as well defined set of APIs,
with only ONE instance building ever.Now with multiple-platform build requirement, that design of code no
longer holds - multiple board specific calls need to build at the same
time - so ARC common code can't use the API approach, it needs a
callback based design where each board registers it's specific set of
functions, and at runtime, depending on board detection, the callbacks
are used from the registry.This commit adds all the infrastructure, where board specific callbacks
are specified as a "maThine description".All the hooks are placed in right spots, no board callbacks registered
yet (with MACHINE_STARt/END constructs) so the hooks will not run.Next commit will actually convert the platform to this infrastructure.
Signed-off-by: Vineet Gupta
Cc: Arnd Bergmann
Acked-by: Arnd Bergmann -
This is more natural and is now doable since the choice constructs are
gone.Signed-off-by: Vineet Gupta
Acked-by: Arnd Bergmann -
This mini patchseries addresses the lack of multi-platform-image support
in ARC port.Older build system only supported one platform(soc) to build at a time
and further only one board of that platform could be built. There was no
technical reason for that - we just didn't have the need.So the first step towards multi-platform (and multi-board) builds it to
allow build system to do that.So as applicable, =>
Signed-off-by: Vineet Gupta
Cc: Arnd Bergmann
Acked-by: Arnd Bergmann -
Implement ioremap_prot() to allow mapping IO memory with variable
protection
via TLB.Implementing this allows the /dev/mem driver to use its generic access()
VMA callback, which in turn allows ptrace to examine data in memory
mapped regions mapped via /dev/mem, such as Arc DCCM.The end result is that it is possible to examine values of variables
placed into DCCM in user space programs via GDB.CC: Alexey Brodkin
CC: Noam Camus
Acked-by: Vineet Gupta
Signed-off-by: Gilad Ben-Yossef
Signed-off-by: Vineet Gupta -
1. ./genfilelist.pl arch/arc/include/asm/
2. Create arch/arc/include/uapi/asm/Kbuild as follows
+# UAPI Header export list
+include include/uapi/asm-generic/Kbuild.asm3. ./disintegrate-one.pl arch/arc/include/{,uapi/}asm/
4. Edit arch/arc/include/asm/Kbuild to remove ref to
asm-generic/Kbuild.asm- To work around empty uapi/asm/setup.h added a placholder comment.
- Also a manual #ifdef __ASSEMBLY__ for a late ptrace changeSigned-off-by: Vineet Gupta
Cc: David Howells -
This allows ARC Target to do I/O to host in absence of any peripherals
whatsoever, assisted by Metaware Hostlink facility.Further we have a FUSE based filesystem which makes us mount/access host
filesystem on target and do fops.Signed-off-by: Vineet Gupta
-
* Includes mapping of CCMs in address space
* Annotations to move arbitrary code/data into CCM
* Moving some of the critical code/data into CCM
* Runtime detection/reportingSigned-off-by: Vineet Gupta
-
Signed-off-by: Vineet Gupta
-
Signed-off-by: Vineet Gupta
-
Signed-off-by: Vineet Gupta
-
Signed-off-by: Mischa Jonker
Signed-off-by: Vineet Gupta
Cc: Jason Wessel
Acked-by: Jason Wessel -
ARC700 doesn't natively support unaligned access, but can be emulated
-Unaligned Access Exception
-Disassembly at the Fault address to find the exact insn (long/short)Also per Arnd's comment, we runtime control it using 2 sysctl knobs:
* SYSCTL_ARCH_UNALIGN_ALLOW: Runtime enable/disble
* SYSCTL_ARCH_UNALIGN_NO_WARN: Warn on each emulation attemptOriginally contributed by Tim Yao
Signed-off-by: Vineet Gupta
Cc: Tim Yao
Acked-by: Arnd Bergmann -
Origin port done by Rajeshwar Ranga
Signed-off-by: Vineet Gupta
Cc: Rajeshwar Ranga -
In-kernel disassembler
Due Credits
* Orig written by Rajeshwar Ranga
* Consolidation/cleanups by Mischa JonkerSigned-off-by: Vineet Gupta
Cc: Rajeshwar Ranga
Cc: Mischa Jonker -
Signed-off-by: Vineet Gupta
-
-Originally written by Rajeshwar Ranga
-Derived off of generic unwinder in 2.6.19 and adapted to ARCSigned-off-by: Vineet Gupta
Cc: Rajeshwar Ranga -
ARC common code to enable a SMP system + ISS provided SMP extensions.
ARC700 natively lacks SMP support, hence some of the core features are
are only enabled if SoCs have the necessary h/w pixie-dust. This
includes:
-Inter Processor Interrupts (IPI)
-Cache coherency
-load-locked/store-conditional
...The low level exception handling would be completely broken in SMP
because we don't have hardware assisted stack switching. Thus a fair bit
of this code is repurposing the MMU_SCRATCH reg for event handler
prologues to keep them re-entrant.Many thanks to Rajeshwar Ranga for his initial "major" contributions to
SMP Port (back in 2008), and to Noam Camus and Gilad Ben-Yossef for help
with resurrecting that in 3.2 kernel (2012).Note that this platform code is again singleton design pattern - so
multiple SMP platforms won't build at the moment - this deficiency is
addressed in subsequent patches within this series.Signed-off-by: Vineet Gupta
Cc: Arnd Bergmann
Cc: Thomas Gleixner
Cc: Rajeshwar Ranga
Cc: Noam Camus
Cc: Gilad Ben-Yossef -
Signed-off-by: Vineet Gupta
-
Signed-off-by: Vineet Gupta
-
There is a bit of hack/kludge right now where we disable preemption if a
L2 (High prio) IRQ is taken while L1 (Low prio) is active.Need to revisit this
Signed-off-by: Vineet Gupta
-
Signed-off-by: Vineet Gupta
Cc: Robert Richter
Cc: oprofile-list@lists.sf.net
Reviewed-by: James Hogan
