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* MIPS: Prevent compiler warning from cop2_{save,restore}Paul Burton2014-10-231-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The no-op cases of cop2_save & cop2_restore lead to the following warnings being emitted during build with recent versions of gcc (tested using gcc 4.8.3 from the Mentor Sourcery CodeBench 2014.05 toolchain): In file included from ./arch/mips/include/asm/switch_to.h:18:0, from kernel/sched/core.c:78: kernel/sched/core.c: In function 'finish_task_switch': include/asm-generic/current.h:6:45: warning: value computed is not used [-Wunused-value] #define get_current() (current_thread_info()->task) ^ ./arch/mips/include/asm/cop2.h:48:32: note: in definition of macro 'cop2_restore' #define cop2_restore(r) do { (r); } while (0) ^ include/asm-generic/current.h:7:17: note: in expansion of macro 'get_current' #define current get_current() ^ ./arch/mips/include/asm/switch_to.h:114:16: note: in expansion of macro 'current' cop2_restore(current); \ ^ kernel/sched/core.c:2225:2: note: in expansion of macro 'finish_arch_switch' finish_arch_switch(prev); ^ Avoid the warning by "using" the value by casting to void. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/7880/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: COP2: CPP macro safety fixes.Ralf Baechle2014-08-261-9/+9
| | | | | | | | - Don't pass things to macros that couldn't be dereferences if that macro was actually a function. - Don't use empty function-like macros. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Loongson-3: Enable the COP2 usageHuacai Chen2014-07-301-0/+8
| | | | | | | | | | | | | | | | | | | Loongson-3 has some specific instructions (MMI/SIMD) in coprocessor 2. COP2 isn't independent because it share COP1 (FPU)'s registers. This patch enable the COP2 usage so user-space programs can use the MMI/SIMD instructions. When COP2 exception happens, we enable both COP1 (FPU) and COP2, only in this way the fp context can be saved and restored correctly. Signed-off-by: Huacai Chen <chenhc@lemote.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/7189/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Netlogic: COP2 save/restore codeJayachandran C2013-06-131-0/+10
| | | | | | | | | | | | | Add COP2 register state structure and functions for Netlogic XLP. The RX and TX buffers and status registers are to be saved. Since the registers are 64-bit, do the implementation in inline assembly which works on both 32-bit and 64-bit kernels. Signed-off-by: Jayachandran C <jchandra@broadcom.com> Cc: linux-mips@linux-mips.org Cc: ddaney.cavm@gmail.com Patchwork: https://patchwork.linux-mips.org/patch/5413/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Move cop2 save/restore to switch_to()Jayachandran C2013-06-131-0/+19
| | | | | | | | | | | | | | | Move the common code for saving and restoring platform specific COP2 registers to switch_to(). This will make supporting new platforms (like Netlogic XLP) easier. The platform specific COP2 definitions are to be specified in asm/processor.h and in asm/cop2.h. Signed-off-by: Jayachandran C <jchandra@broadcom.com> Cc: linux-mips@linux-mips.org Cc: ddaney.cavm@gmail.com Patchwork: https://patchwork.linux-mips.org/patch/5411/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Don't place cu2 notifiers in __cpuinitdataDavid Daney2010-10-041-1/+1
| | | | | | | | | | The notifiers may be called at any time, so the notifier_block cannot be in init memory. Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/1592/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Provide more elevant interface cu2_notifier for CP2 extensions.Ralf Baechle2010-08-051-0/+12
| | | | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: David Daney <ddaney@caviumnetworks.com> Patchwork: https://patchwork.linux-mips.org/patch/1504/
* MIPS: Modularize COP2 handlingRalf Baechle2009-12-171-0/+23
Away with the daemons of ifdef; get ready for future COP2 users. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/708/
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