diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2013-01-18 10:42:23 +0100 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-02-15 18:46:02 +0100 |
| commit | 41195d236e84458bebd4fdc218610a92231ac791 (patch) | |
| tree | c0049630c1a21a071c9c942086041029ebdf2866 /arch/arc/plat-arcfpga/Kconfig | |
| parent | ARC: Diagnostics: show_regs() etc (diff) | |
| download | linux-41195d236e84458bebd4fdc218610a92231ac791.tar.xz linux-41195d236e84458bebd4fdc218610a92231ac791.zip | |
ARC: SMP support
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 <vgupta@synopsys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rajeshwar Ranga <rajeshwar.ranga@gmail.com>
Cc: Noam Camus <noamc@ezchip.com>
Cc: Gilad Ben-Yossef <gilad@benyossef.com>
Diffstat (limited to 'arch/arc/plat-arcfpga/Kconfig')
| -rw-r--r-- | arch/arc/plat-arcfpga/Kconfig | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arc/plat-arcfpga/Kconfig b/arch/arc/plat-arcfpga/Kconfig index 7af3a4e7f7d2..38752bfb91e0 100644 --- a/arch/arc/plat-arcfpga/Kconfig +++ b/arch/arc/plat-arcfpga/Kconfig @@ -13,6 +13,7 @@ choice config ARC_BOARD_ANGEL4 bool "ARC Angel4" + select ISS_SMP_EXTN if SMP help ARC Angel4 FPGA Ref Platform (Xilinx Virtex Based) @@ -21,6 +22,19 @@ config ARC_BOARD_ML509 help ARC ML509 FPGA Ref Platform (Xilinx Virtex-5 Based) +config ISS_SMP_EXTN + bool "ARC SMP Extensions (ISS Models only)" + default n + depends on SMP + select ARC_HAS_COH_RTSC + help + SMP Extensions to ARC700, in a "simulation only" Model, supported in + ARC ISS (Instruction Set Simulator). + The SMP extensions include: + -IDU (Interrupt Distribution Unit) + -XTL (To enable CPU start/stop/set-PC for another CPU) + It doesn't provide coherent Caches and/or Atomic Ops (LLOCK/SCOND) + endchoice config ARC_SERIAL_BAUD |