diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/pmu/fuc/arith.fuc')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/pmu/fuc/arith.fuc | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/fuc/arith.fuc b/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/fuc/arith.fuc new file mode 100644 index 000000000000..214a6d9e088d --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/fuc/arith.fuc @@ -0,0 +1,94 @@ +/* + * Copyright 2014 Martin Peres <martin.peres@free.fr> + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the folloing conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: Martin Peres + */ + +/****************************************************************************** + * arith data segment + *****************************************************************************/ +#ifdef INCLUDE_PROC +#endif + +#ifdef INCLUDE_DATA +#endif + +/****************************************************************************** + * arith code segment + *****************************************************************************/ +#ifdef INCLUDE_CODE + +// does a 32x32 -> 64 multiplication +// +// A * B = A_lo * B_lo +// + ( A_hi * B_lo ) << 16 +// + ( A_lo * B_hi ) << 16 +// + ( A_hi * B_hi ) << 32 +// +// $r15 - current +// $r14 - A +// $r13 - B +// $r12 - mul_lo (return) +// $r11 - mul_hi (return) +// $r0 - zero +mulu32_32_64: + push $r1 // A_hi + push $r2 // B_hi + push $r3 // tmp0 + push $r4 // tmp1 + + shr b32 $r1 $r14 16 + shr b32 $r2 $r13 16 + + clear b32 $r12 + clear b32 $r11 + + // A_lo * B_lo + mulu $r12 $r14 $r13 + + // ( A_hi * B_lo ) << 16 + mulu $r3 $r1 $r13 // tmp0 = A_hi * B_lo + mov b32 $r4 $r3 + and $r3 0xffff // tmp0 = tmp0_lo + shl b32 $r3 16 + shr b32 $r4 16 // tmp1 = tmp0_hi + add b32 $r12 $r3 + adc b32 $r11 $r4 + + // ( A_lo * B_hi ) << 16 + mulu $r3 $r14 $r2 // tmp0 = A_lo * B_hi + mov b32 $r4 $r3 + and $r3 0xffff // tmp0 = tmp0_lo + shl b32 $r3 16 + shr b32 $r4 16 // tmp1 = tmp0_hi + add b32 $r12 $r3 + adc b32 $r11 $r4 + + // ( A_hi * B_hi ) << 32 + mulu $r3 $r1 $r2 // tmp0 = A_hi * B_hi + add b32 $r11 $r3 + + pop $r4 + pop $r3 + pop $r2 + pop $r1 + ret +#endif |