* [PATCH v2 07/30] Add powerpc-specific parity functions
[not found] <57031D9D.801@gmail.com>
@ 2016-04-06 9:03 ` zengzhaoxiu
0 siblings, 0 replies; only message in thread
From: zengzhaoxiu @ 2016-04-06 9:03 UTC (permalink / raw)
To: benh, paulus, mpe, anton, oss, christophe.leroy, duwe
Cc: linuxppc-dev, linux-kernel, Zhaoxiu Zeng
From: Zhaoxiu Zeng <zhaoxiu.zeng@gmail.com>
Use runtime patching for ppc64, lifted from hweight_64
Signed-off-by: Zhaoxiu Zeng <zhaoxiu.zeng@gmail.com>
---
arch/powerpc/include/asm/bitops.h | 11 ++++
arch/powerpc/lib/Makefile | 2 +-
arch/powerpc/lib/parity_64.S | 107 ++++++++++++++++++++++++++++++++++++++
arch/powerpc/lib/ppc_ksyms.c | 5 ++
4 files changed, 124 insertions(+), 1 deletion(-)
create mode 100644 arch/powerpc/lib/parity_64.S
diff --git a/arch/powerpc/include/asm/bitops.h b/arch/powerpc/include/asm/bitops.h
index 59abc62..cb92783 100644
--- a/arch/powerpc/include/asm/bitops.h
+++ b/arch/powerpc/include/asm/bitops.h
@@ -269,8 +269,19 @@ unsigned int __arch_hweight16(unsigned int w);
unsigned int __arch_hweight32(unsigned int w);
unsigned long __arch_hweight64(__u64 w);
#include <asm-generic/bitops/const_hweight.h>
+static inline unsigned int __arch_parity4(unsigned int w)
+{
+ w &= 0xf;
+ return (0x6996 >> w) & 1;
+}
+unsigned int __arch_parity8(unsigned int w);
+unsigned int __arch_parity16(unsigned int w);
+unsigned int __arch_parity32(unsigned int w);
+unsigned int __arch_parity64(__u64 w);
+#include <asm-generic/bitops/const_parity.h>
#else
#include <asm-generic/bitops/hweight.h>
+#include <asm-generic/bitops/parity.h>
#endif
#include <asm-generic/bitops/find.h>
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index ba21be1..cae2e7f 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -16,7 +16,7 @@ obj-$(CONFIG_PPC32) += div64.o copy_32.o
obj64-y += copypage_64.o copyuser_64.o usercopy_64.o mem_64.o hweight_64.o \
copyuser_power7.o string_64.o copypage_power7.o memcpy_power7.o \
- memcpy_64.o memcmp_64.o
+ memcpy_64.o memcmp_64.o parity_64.o
obj64-$(CONFIG_SMP) += locks.o
obj64-$(CONFIG_ALTIVEC) += vmx-helper.o
diff --git a/arch/powerpc/lib/parity_64.S b/arch/powerpc/lib/parity_64.S
new file mode 100644
index 0000000..f8a2771
--- /dev/null
+++ b/arch/powerpc/lib/parity_64.S
@@ -0,0 +1,107 @@
+#include <asm/processor.h>
+#include <asm/ppc_asm.h>
+
+/* Note: This code relies on -mminimal-toc */
+
+_GLOBAL(__arch_parity8)
+BEGIN_FTR_SECTION
+ srdi r4,r3,4
+ xor r3,r3,r4
+ clrldi r3,r3,64-4
+ li r4,0x6996
+ srd r3,r4,r3
+ clrldi r3,r3,64-1
+ blr
+FTR_SECTION_ELSE
+ PPC_POPCNTB(R3,R3)
+ clrldi r3,r3,64-1
+ blr
+ALT_FTR_SECTION_END_IFCLR(CPU_FTR_POPCNTB)
+
+_GLOBAL(__arch_parity16)
+BEGIN_FTR_SECTION
+ srdi r4,r3,8
+ xor r3,r3,r4
+ srdi r4,r3,4
+ xor r3,r3,r4
+ clrldi r3,r3,64-4
+ li r4,0x6996
+ srd r3,r4,r3
+ clrldi r3,r3,64-1
+ blr
+FTR_SECTION_ELSE
+ BEGIN_FTR_SECTION_NESTED(50)
+ PPC_POPCNTB(R3,R3)
+ srdi r4,r3,8
+ add r3,r4,r3
+ clrldi r3,r3,64-1
+ blr
+ FTR_SECTION_ELSE_NESTED(50)
+ clrlwi r3,r3,16
+ PPC_POPCNTW(R3,R3)
+ clrldi r3,r3,64-1
+ blr
+ ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_POPCNTD, 50)
+ALT_FTR_SECTION_END_IFCLR(CPU_FTR_POPCNTB)
+
+_GLOBAL(__arch_parity32)
+BEGIN_FTR_SECTION
+ srdi r4,r3,16
+ xor r3,r3,r4
+ srdi r4,r3,8
+ xor r3,r3,r4
+ srdi r4,r3,4
+ xor r3,r3,r4
+ clrldi r3,r3,64-4
+ li r4,0x6996
+ srd r3,r4,r3
+ clrldi r3,r3,64-1
+ blr
+FTR_SECTION_ELSE
+ BEGIN_FTR_SECTION_NESTED(51)
+ PPC_POPCNTB(R3,R3)
+ srdi r4,r3,16
+ add r3,r4,r3
+ srdi r4,r3,8
+ add r3,r4,r3
+ clrldi r3,r3,64-1
+ blr
+ FTR_SECTION_ELSE_NESTED(51)
+ PPC_POPCNTW(R3,R3)
+ clrldi r3,r3,64-1
+ blr
+ ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_POPCNTD, 51)
+ALT_FTR_SECTION_END_IFCLR(CPU_FTR_POPCNTB)
+
+_GLOBAL(__arch_parity64)
+BEGIN_FTR_SECTION
+ srdi r4,r3,32
+ xor r3,r3,r4
+ srdi r4,r3,16
+ xor r3,r3,r4
+ srdi r4,r3,8
+ xor r3,r3,r4
+ srdi r4,r3,4
+ xor r3,r3,r4
+ clrldi r3,r3,64-4
+ li r4,0x6996
+ srd r3,r4,r3
+ clrldi r3,r3,64-1
+ blr
+FTR_SECTION_ELSE
+ BEGIN_FTR_SECTION_NESTED(52)
+ PPC_POPCNTB(R3,R3)
+ srdi r4,r3,32
+ add r3,r4,r3
+ srdi r4,r3,16
+ add r3,r4,r3
+ srdi r4,r3,8
+ add r3,r4,r3
+ clrldi r3,r3,64-1
+ blr
+ FTR_SECTION_ELSE_NESTED(52)
+ PPC_POPCNTD(R3,R3)
+ clrldi r3,r3,64-1
+ blr
+ ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_POPCNTD, 52)
+ALT_FTR_SECTION_END_IFCLR(CPU_FTR_POPCNTB)
diff --git a/arch/powerpc/lib/ppc_ksyms.c b/arch/powerpc/lib/ppc_ksyms.c
index c422812..1ccfc29 100644
--- a/arch/powerpc/lib/ppc_ksyms.c
+++ b/arch/powerpc/lib/ppc_ksyms.c
@@ -30,4 +30,9 @@ EXPORT_SYMBOL(__arch_hweight8);
EXPORT_SYMBOL(__arch_hweight16);
EXPORT_SYMBOL(__arch_hweight32);
EXPORT_SYMBOL(__arch_hweight64);
+
+EXPORT_SYMBOL(__arch_parity8);
+EXPORT_SYMBOL(__arch_parity16);
+EXPORT_SYMBOL(__arch_parity32);
+EXPORT_SYMBOL(__arch_parity64);
#endif
--
2.5.0
^ permalink raw reply related [flat|nested] only message in thread