On 16.04.2013 19:20, Tim Chen wrote: > This is the x86_64 CRC T10 DIF transform accelerated with the PCLMULQDQ > instructions. Details discussing the implementation can be found in the > paper: > > "Fast CRC Computation for Generic Polynomials Using PCLMULQDQ Instruction" > URL: http://download.intel.com/design/intarch/papers/323102.pdf
URL does not work. > > Signed-off-by: Tim Chen <tim.c.c...@linux.intel.com> > Tested-by: Keith Busch <keith.bu...@intel.com> > --- > arch/x86/crypto/crct10dif-pcl-asm_64.S | 659 > +++++++++++++++++++++++++++++++++ > 1 file changed, 659 insertions(+) > create mode 100644 arch/x86/crypto/crct10dif-pcl-asm_64.S <snip> > + > + # Allocate Stack Space > + mov %rsp, %rcx > + sub $16*10, %rsp > + and $~(0x20 - 1), %rsp > + > + # push the xmm registers into the stack to maintain > + movdqa %xmm10, 16*2(%rsp) > + movdqa %xmm11, 16*3(%rsp) > + movdqa %xmm8 , 16*4(%rsp) > + movdqa %xmm12, 16*5(%rsp) > + movdqa %xmm13, 16*6(%rsp) > + movdqa %xmm6, 16*7(%rsp) > + movdqa %xmm7, 16*8(%rsp) > + movdqa %xmm9, 16*9(%rsp) You don't need to store (and restore) these, as 'crc_t10dif_pcl' is called between kernel_fpu_begin/_end. > + > + > + # check if smaller than 256 > + cmp $256, arg3 > + <snip> > +_cleanup: > + # scale the result back to 16 bits > + shr $16, %eax > + movdqa 16*2(%rsp), %xmm10 > + movdqa 16*3(%rsp), %xmm11 > + movdqa 16*4(%rsp), %xmm8 > + movdqa 16*5(%rsp), %xmm12 > + movdqa 16*6(%rsp), %xmm13 > + movdqa 16*7(%rsp), %xmm6 > + movdqa 16*8(%rsp), %xmm7 > + movdqa 16*9(%rsp), %xmm9 Registers are overwritten by kernel_fpu_end. > + mov %rcx, %rsp > + ret > +ENDPROC(crc_t10dif_pcl) > + You should move ENDPROC at end of the full function. > +######################################################################## > + > +.align 16 > +_less_than_128: > + > + # check if there is enough buffer to be able to fold 16B at a time > + cmp $32, arg3 <snip> > + movdqa (%rsp), %xmm7 > + pshufb %xmm11, %xmm7 > + pxor %xmm0 , %xmm7 # xor the initial crc value > + > + psrldq $7, %xmm7 > + > + jmp _barrett Move ENDPROC here. -Jussi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
