kernel/drivers/crypto/vmx/ghashp8-ppc.pl

   1 #!/usr/bin/env perl
   2 #
   3 # ====================================================================
   4 # Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
   5 # project. The module is, however, dual licensed under OpenSSL and
   6 # CRYPTOGAMS licenses depending on where you obtain it. For further
   7 # details see http://www.openssl.org/~appro/cryptogams/.
   8 # ====================================================================
   9 #
  10 # GHASH for for PowerISA v2.07.
  11 #
  12 # July 2014
  13 #
  14 # Accurate performance measurements are problematic, because it's
  15 # always virtualized setup with possibly throttled processor.
  16 # Relative comparison is therefore more informative. This initial
  17 # version is ~2.1x slower than hardware-assisted AES-128-CTR, ~12x
  18 # faster than "4-bit" integer-only compiler-generated 64-bit code.
  19 # "Initial version" means that there is room for futher improvement.
  20
  21 $flavour=shift;
  22 $output =shift;
  23
  24 if ($flavour =~ /64/) {
  25         $SIZE_T=8;
  26         $LRSAVE=2*$SIZE_T;
  27         $STU="stdu";
  28         $POP="ld";
  29         $PUSH="std";
  30 } elsif ($flavour =~ /32/) {
  31         $SIZE_T=4;
  32         $LRSAVE=$SIZE_T;
  33         $STU="stwu";
  34         $POP="lwz";
  35         $PUSH="stw";
  36 } else { die "nonsense $flavour"; }
  37
  38 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
  39 ( $xlate="${dir}ppc-xlate.pl" and -f $xlate ) or
  40 ( $xlate="${dir}../../perlasm/ppc-xlate.pl" and -f $xlate) or
  41 die "can't locate ppc-xlate.pl";
  42
  43 open STDOUT,"| $^X $xlate $flavour $output" || die "can't call $xlate: $!";
  44
  45 my ($Xip,$Htbl,$inp,$len)=map("r$_",(3..6));    # argument block
  46
  47 my ($Xl,$Xm,$Xh,$IN)=map("v$_",(0..3));
  48 my ($zero,$t0,$t1,$t2,$xC2,$H,$Hh,$Hl,$lemask)=map("v$_",(4..12));
  49 my $vrsave="r12";
  50
  51 $code=<<___;
  52 .machine        "any"
  53
  54 .text
  55
  56 .globl  .gcm_init_p8
  57         lis             r0,0xfff0
  58         li              r8,0x10
  59         mfspr           $vrsave,256
  60         li              r9,0x20
  61         mtspr           256,r0
  62         li              r10,0x30
  63         lvx_u           $H,0,r4                 # load H
  64
  65         vspltisb        $xC2,-16                # 0xf0
  66         vspltisb        $t0,1                   # one
  67         vaddubm         $xC2,$xC2,$xC2          # 0xe0
  68         vxor            $zero,$zero,$zero
  69         vor             $xC2,$xC2,$t0           # 0xe1
  70         vsldoi          $xC2,$xC2,$zero,15      # 0xe1...
  71         vsldoi          $t1,$zero,$t0,1         # ...1
  72         vaddubm         $xC2,$xC2,$xC2          # 0xc2...
  73         vspltisb        $t2,7
  74         vor             $xC2,$xC2,$t1           # 0xc2....01
  75         vspltb          $t1,$H,0                # most significant byte
  76         vsl             $H,$H,$t0               # H<<=1
  77         vsrab           $t1,$t1,$t2             # broadcast carry bit
  78         vand            $t1,$t1,$xC2
  79         vxor            $H,$H,$t1               # twisted H
  80
  81         vsldoi          $H,$H,$H,8              # twist even more ...
  82         vsldoi          $xC2,$zero,$xC2,8       # 0xc2.0
  83         vsldoi          $Hl,$zero,$H,8          # ... and split
  84         vsldoi          $Hh,$H,$zero,8
  85
  86         stvx_u          $xC2,0,r3               # save pre-computed table
  87         stvx_u          $Hl,r8,r3
  88         stvx_u          $H, r9,r3
  89         stvx_u          $Hh,r10,r3
  90
  91         mtspr           256,$vrsave
  92         blr
  93         .long           0
  94         .byte           0,12,0x14,0,0,0,2,0
  95         .long           0
  96 .size   .gcm_init_p8,.-.gcm_init_p8
  97
  98 .globl  .gcm_gmult_p8
  99         lis             r0,0xfff8
 100         li              r8,0x10
 101         mfspr           $vrsave,256
 102         li              r9,0x20
 103         mtspr           256,r0
 104         li              r10,0x30
 105         lvx_u           $IN,0,$Xip              # load Xi
 106
 107         lvx_u           $Hl,r8,$Htbl            # load pre-computed table
 108          le?lvsl        $lemask,r0,r0
 109         lvx_u           $H, r9,$Htbl
 110          le?vspltisb    $t0,0x07
 111         lvx_u           $Hh,r10,$Htbl
 112          le?vxor        $lemask,$lemask,$t0
 113         lvx_u           $xC2,0,$Htbl
 114          le?vperm       $IN,$IN,$IN,$lemask
 115         vxor            $zero,$zero,$zero
 116
 117         vpmsumd         $Xl,$IN,$Hl             # H.lo·Xi.lo
 118         vpmsumd         $Xm,$IN,$H              # H.hi·Xi.lo+H.lo·Xi.hi
 119         vpmsumd         $Xh,$IN,$Hh             # H.hi·Xi.hi
 120
 121         vpmsumd         $t2,$Xl,$xC2            # 1st phase
 122
 123         vsldoi          $t0,$Xm,$zero,8
 124         vsldoi          $t1,$zero,$Xm,8
 125         vxor            $Xl,$Xl,$t0
 126         vxor            $Xh,$Xh,$t1
 127
 128         vsldoi          $Xl,$Xl,$Xl,8
 129         vxor            $Xl,$Xl,$t2
 130
 131         vsldoi          $t1,$Xl,$Xl,8           # 2nd phase
 132         vpmsumd         $Xl,$Xl,$xC2
 133         vxor            $t1,$t1,$Xh
 134         vxor            $Xl,$Xl,$t1
 135
 136         le?vperm        $Xl,$Xl,$Xl,$lemask
 137         stvx_u          $Xl,0,$Xip              # write out Xi
 138
 139         mtspr           256,$vrsave
 140         blr
 141         .long           0
 142         .byte           0,12,0x14,0,0,0,2,0
 143         .long           0
 144 .size   .gcm_gmult_p8,.-.gcm_gmult_p8
 145
 146 .globl  .gcm_ghash_p8
 147         lis             r0,0xfff8
 148         li              r8,0x10
 149         mfspr           $vrsave,256
 150         li              r9,0x20
 151         mtspr           256,r0
 152         li              r10,0x30
 153         lvx_u           $Xl,0,$Xip              # load Xi
 154
 155         lvx_u           $Hl,r8,$Htbl            # load pre-computed table
 156          le?lvsl        $lemask,r0,r0
 157         lvx_u           $H, r9,$Htbl
 158          le?vspltisb    $t0,0x07
 159         lvx_u           $Hh,r10,$Htbl
 160          le?vxor        $lemask,$lemask,$t0
 161         lvx_u           $xC2,0,$Htbl
 162          le?vperm       $Xl,$Xl,$Xl,$lemask
 163         vxor            $zero,$zero,$zero
 164
 165         lvx_u           $IN,0,$inp
 166         addi            $inp,$inp,16
 167         subi            $len,$len,16
 168          le?vperm       $IN,$IN,$IN,$lemask
 169         vxor            $IN,$IN,$Xl
 170         b               Loop
 171
 172 .align  5
 173 Loop:
 174          subic          $len,$len,16
 175         vpmsumd         $Xl,$IN,$Hl             # H.lo·Xi.lo
 176          subfe.         r0,r0,r0                # borrow?-1:0
 177         vpmsumd         $Xm,$IN,$H              # H.hi·Xi.lo+H.lo·Xi.hi
 178          and            r0,r0,$len
 179         vpmsumd         $Xh,$IN,$Hh             # H.hi·Xi.hi
 180          add            $inp,$inp,r0
 181
 182         vpmsumd         $t2,$Xl,$xC2            # 1st phase
 183
 184         vsldoi          $t0,$Xm,$zero,8
 185         vsldoi          $t1,$zero,$Xm,8
 186         vxor            $Xl,$Xl,$t0
 187         vxor            $Xh,$Xh,$t1
 188
 189         vsldoi          $Xl,$Xl,$Xl,8
 190         vxor            $Xl,$Xl,$t2
 191          lvx_u          $IN,0,$inp
 192          addi           $inp,$inp,16
 193
 194         vsldoi          $t1,$Xl,$Xl,8           # 2nd phase
 195         vpmsumd         $Xl,$Xl,$xC2
 196          le?vperm       $IN,$IN,$IN,$lemask
 197         vxor            $t1,$t1,$Xh
 198         vxor            $IN,$IN,$t1
 199         vxor            $IN,$IN,$Xl
 200         beq             Loop                    # did $len-=16 borrow?
 201
 202         vxor            $Xl,$Xl,$t1
 203         le?vperm        $Xl,$Xl,$Xl,$lemask
 204         stvx_u          $Xl,0,$Xip              # write out Xi
 205
 206         mtspr           256,$vrsave
 207         blr
 208         .long           0
 209         .byte           0,12,0x14,0,0,0,4,0
 210         .long           0
 211 .size   .gcm_ghash_p8,.-.gcm_ghash_p8
 212
 213 .asciz  "GHASH for PowerISA 2.07, CRYPTOGAMS by <appro\@openssl.org>"
 214 .align  2
 215 ___
 216
 217 foreach (split("\n",$code)) {
 218         if ($flavour =~ /le$/o) {       # little-endian
 219             s/le\?//o           or
 220             s/be\?/#be#/o;
 221         } else {
 222             s/le\?/#le#/o       or
 223             s/be\?//o;
 224         }
 225         print $_,"\n";
 226 }
 227
 228 close STDOUT; # enforce flush