diff options
Diffstat (limited to 'arch/powerpc/crypto')
| -rw-r--r-- | arch/powerpc/crypto/crc32-vpmsum_core.S | 31 | ||||
| -rw-r--r-- | arch/powerpc/crypto/crc32c-vpmsum_asm.S | 1 |
2 files changed, 31 insertions, 1 deletions
diff --git a/arch/powerpc/crypto/crc32-vpmsum_core.S b/arch/powerpc/crypto/crc32-vpmsum_core.S index 7c6be6a5c977..aadb59c96a27 100644 --- a/arch/powerpc/crypto/crc32-vpmsum_core.S +++ b/arch/powerpc/crypto/crc32-vpmsum_core.S @@ -35,7 +35,9 @@ .text -#if defined(__BIG_ENDIAN__) +#if defined(__BIG_ENDIAN__) && defined(REFLECT) +#define BYTESWAP_DATA +#elif defined(__LITTLE_ENDIAN__) && !defined(REFLECT) #define BYTESWAP_DATA #else #undef BYTESWAP_DATA @@ -108,7 +110,11 @@ FUNC_START(CRC_FUNCTION_NAME) /* Get the initial value into v8 */ vxor v8,v8,v8 MTVRD(v8, R3) +#ifdef REFLECT vsldoi v8,zeroes,v8,8 /* shift into bottom 32 bits */ +#else + vsldoi v8,v8,zeroes,4 /* shift into top 32 bits */ +#endif #ifdef BYTESWAP_DATA addis r3,r2,.byteswap_constant@toc@ha @@ -354,6 +360,7 @@ FUNC_START(CRC_FUNCTION_NAME) vxor v6,v6,v14 vxor v7,v7,v15 +#ifdef REFLECT /* * vpmsumd produces a 96 bit result in the least significant bits * of the register. Since we are bit reflected we have to shift it @@ -368,6 +375,7 @@ FUNC_START(CRC_FUNCTION_NAME) vsldoi v5,v5,zeroes,4 vsldoi v6,v6,zeroes,4 vsldoi v7,v7,zeroes,4 +#endif /* xor with last 1024 bits */ lvx v8,0,r4 @@ -511,13 +519,33 @@ FUNC_START(CRC_FUNCTION_NAME) vsldoi v1,v0,v0,8 vxor v0,v0,v1 /* xor two 64 bit results together */ +#ifdef REFLECT /* shift left one bit */ vspltisb v1,1 vsl v0,v0,v1 +#endif vand v0,v0,mask_64bit +#ifndef REFLECT + /* + * Now for the Barrett reduction algorithm. The idea is to calculate q, + * the multiple of our polynomial that we need to subtract. By + * doing the computation 2x bits higher (ie 64 bits) and shifting the + * result back down 2x bits, we round down to the nearest multiple. + */ + VPMSUMD(v1,v0,const1) /* ma */ + vsldoi v1,zeroes,v1,8 /* q = floor(ma/(2^64)) */ + VPMSUMD(v1,v1,const2) /* qn */ + vxor v0,v0,v1 /* a - qn, subtraction is xor in GF(2) */ /* + * Get the result into r3. We need to shift it left 8 bytes: + * V0 [ 0 1 2 X ] + * V0 [ 0 X 2 3 ] + */ + vsldoi v0,v0,zeroes,8 /* shift result into top 64 bits */ +#else + /* * The reflected version of Barrett reduction. Instead of bit * reflecting our data (which is expensive to do), we bit reflect our * constants and our algorithm, which means the intermediate data in @@ -537,6 +565,7 @@ FUNC_START(CRC_FUNCTION_NAME) * V0 [ 0 X 2 3 ] */ vsldoi v0,v0,zeroes,4 /* shift result into top 64 bits of */ +#endif /* Get it into r3 */ MFVRD(R3, v0) diff --git a/arch/powerpc/crypto/crc32c-vpmsum_asm.S b/arch/powerpc/crypto/crc32c-vpmsum_asm.S index c0d080caefc1..d2bea48051a0 100644 --- a/arch/powerpc/crypto/crc32c-vpmsum_asm.S +++ b/arch/powerpc/crypto/crc32c-vpmsum_asm.S @@ -842,4 +842,5 @@ .octa 0x00000000000000000000000105ec76f1 #define CRC_FUNCTION_NAME __crc32c_vpmsum +#define REFLECT #include "crc32-vpmsum_core.S" |