src/panfrost/bifrost/bifrost.h

   1 /*
   2  * Copyright (C) 2019 Connor Abbott <cwabbott0@gmail.com>
   3  * Copyright (C) 2019 Lyude Paul <thatslyude@gmail.com>
   4  * Copyright (C) 2019 Ryan Houdek <Sonicadvance1@gmail.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  */
  25
  26 #ifndef __bifrost_h__
  27 #define __bifrost_h__
  28
  29 #include <stdint.h>
  30 #include <stdbool.h>
  31
  32 enum bifrost_clause_type {
  33         BIFROST_CLAUSE_NONE       = 0,
  34         BIFROST_CLAUSE_LOAD_VARY  = 1,
  35         BIFROST_CLAUSE_UBO        = 2,
  36         BIFROST_CLAUSE_TEX        = 3,
  37         BIFROST_CLAUSE_SSBO_LOAD  = 5,
  38         BIFROST_CLAUSE_SSBO_STORE = 6,
  39         BIFROST_CLAUSE_BLEND      = 9,
  40         BIFROST_CLAUSE_ATEST      = 13,
  41         BIFROST_CLAUSE_64BIT      = 15
  42 };
  43
  44 struct bifrost_header {
  45         unsigned unk0 : 7;
  46         // If true, convert any infinite result of any floating-point operation to
  47         // the biggest representable number.
  48         unsigned suppress_inf: 1;
  49         // Convert any NaN results to 0.
  50         unsigned suppress_nan : 1;
  51         unsigned unk1 : 2;
  52         // true if the execution mask of the next clause is the same as the mask of
  53         // the current clause.
  54         unsigned back_to_back : 1;
  55         unsigned no_end_of_shader: 1;
  56         unsigned unk2 : 2;
  57         // Set to true for fragment shaders, to implement this bit of spec text
  58         // from section 7.1.5 of the GLSL ES spec:
  59         //
  60         // "Stores to image and buffer variables performed by helper invocations
  61         // have no effect on the underlying image or buffer memory."
  62         //
  63         // Helper invocations are threads (invocations) corresponding to pixels in
  64         // a quad that aren't actually part of the triangle, but are included to
  65         // make derivatives work correctly. They're usually turned on, but they
  66         // need to be masked off for GLSL-level stores. This bit seems to be the
  67         // only bit that's actually different between fragment shaders and other
  68         // shaders, so this is probably what it's doing.
  69         unsigned elide_writes : 1;
  70         // If backToBack is off:
  71         // - true for conditional branches and fallthrough
  72         // - false for unconditional branches
  73         // The blob seems to always set it to true if back-to-back is on.
  74         unsigned branch_cond : 1;
  75         // This bit is set when the next clause writes to the data register of some
  76         // previous clause.
  77         unsigned datareg_writebarrier: 1;
  78         unsigned datareg : 6;
  79         unsigned scoreboard_deps: 8;
  80         unsigned scoreboard_index: 3;
  81         enum bifrost_clause_type clause_type: 4;
  82         unsigned unk3 : 1; // part of clauseType?
  83         enum bifrost_clause_type next_clause_type: 4;
  84         unsigned unk4 : 1; // part of nextClauseType?
  85 } __attribute__((packed));
  86
  87 enum bifrost_packed_src {
  88         BIFROST_SRC_PORT0    = 0,
  89         BIFROST_SRC_PORT1    = 1,
  90         BIFROST_SRC_PORT3    = 2,
  91         BIFROST_SRC_STAGE    = 3,
  92         BIFROST_SRC_CONST_LO = 4,
  93         BIFROST_SRC_CONST_HI = 5,
  94         BIFROST_SRC_PASS_FMA = 6,
  95         BIFROST_SRC_PASS_ADD = 7,
  96 };
  97
  98 #define BIFROST_FMA_EXT (0xe0000)
  99 #define BIFROST_FMA_OP_MOV BIFROST_FMA_EXT | (0x32d)
 100 #define BIFROST_FMA_OP_FREXPE_LOG BIFROST_FMA_EXT | 0x3c5
 101 #define BIFROST_FMA_OP_ADD_FREXPM ((BIFROST_FMA_EXT | 0x1e80) >> 3)
 102 #define BIFROST_FMA_SEL_16(swiz) (((BIFROST_FMA_EXT | 0x1e00) >> 3) | (swiz))
 103
 104 struct bifrost_fma_inst {
 105         unsigned src0 : 3;
 106         unsigned op   : 20;
 107 } __attribute__((packed));
 108
 109 struct bifrost_fma_2src {
 110         unsigned src0 : 3;
 111         unsigned src1 : 3;
 112         unsigned op   : 17;
 113 } __attribute__((packed));
 114
 115 #define BIFROST_FMA_OP_MSCALE (0x50 >> 3)
 116
 117 struct bifrost_fma_mscale {
 118         unsigned src0 : 3;
 119         unsigned src1 : 3;
 120         unsigned src2 : 3;
 121         unsigned src3 : 3;
 122
 123         /* If mscale_mode is set - an MSCALE specific mode. If it is not set, a
 124          * regular outmod */
 125         unsigned mode : 2;
 126         unsigned mscale_mode : 1;
 127
 128         unsigned src0_abs : 1;
 129         unsigned src1_neg : 1;
 130         unsigned src2_neg : 1;
 131         unsigned op   : 5;
 132 } __attribute__((packed));
 133
 134 #define BIFROST_ADD_OP_BLEND (0x1952c)
 135 #define BIFROST_ADD_OP_FRCP_FAST_F32 (0x0cc00)
 136 #define BIFROST_ADD_OP_FRCP_FAST_F16_X (0x0ce10)
 137 #define BIFROST_ADD_OP_FRCP_FAST_F16_Y (0x0ce30)
 138 #define BIFROST_ADD_OP_FRSQ_FAST_F32 (0x0cc20)
 139 #define BIFROST_ADD_OP_FRSQ_FAST_F16_X (0x0ce50)
 140 #define BIFROST_ADD_OP_FRSQ_FAST_F16_Y (0x0ce70)
 141 #define BIFROST_ADD_OP_LOG2_HELP  (0x0cc68)
 142 #define BIFROST_ADD_OP_FEXP2_FAST (0x0cd58)
 143
 144 struct bifrost_add_inst {
 145         unsigned src0 : 3;
 146         unsigned op   : 17;
 147 } __attribute__((packed));
 148
 149 #define BIFROST_ADD_OP_LD_UBO_1 (0x0c1a0 >> 3)
 150 #define BIFROST_ADD_OP_LD_UBO_2 (0x0c1e0 >> 3)
 151 #define BIFROST_ADD_OP_LD_UBO_3 (0x0caa0 >> 3)
 152 #define BIFROST_ADD_OP_LD_UBO_4 (0x0c220 >> 3)
 153 #define BIFROST_ADD_SEL_16(swiz) ((0xea60 >> 3) | (swiz))
 154
 155 struct bifrost_add_2src {
 156         unsigned src0 : 3;
 157         unsigned src1 : 3;
 158         unsigned op   : 14;
 159 } __attribute__((packed));
 160
 161 #define BIFROST_ADD_OP_FMAX32 (0x00)
 162 #define BIFROST_ADD_OP_FMIN32 (0x01)
 163 #define BIFROST_ADD_OP_FADD32 (0x02)
 164
 165 #define BIFROST_ADD_OP_FADD16 (0x0A)
 166
 167 struct bifrost_add_faddmin {
 168         unsigned src0 : 3;
 169         unsigned src1 : 3;
 170         unsigned src1_abs : 1;
 171         unsigned src0_neg : 1;
 172         unsigned src1_neg : 1;
 173         unsigned select : 2; /* swizzle_0 for fp16 */
 174         unsigned outmod : 2; /* swizzle_1 for fp16 */
 175         unsigned mode : 2;
 176         unsigned src0_abs : 1;
 177         unsigned op   : 4;
 178 } __attribute__((packed));
 179
 180 #define BIFROST_ADD_OP_FMAX16 (0x10)
 181 #define BIFROST_ADD_OP_FMIN16 (0x12)
 182
 183 struct bifrost_add_fmin16 {
 184         unsigned src0 : 3;
 185         unsigned src1 : 3;
 186         /* abs2 inferred as with FMA */
 187         unsigned abs1 : 1;
 188         unsigned src0_neg : 1;
 189         unsigned src1_neg : 1;
 190         unsigned src0_swizzle : 2;
 191         unsigned src1_swizzle : 2;
 192         unsigned mode : 2;
 193         unsigned op : 5;
 194 } __attribute__((packed));
 195
 196 #define BIFROST_ADD_OP_ST_VAR (0x19300 >> 8)
 197
 198 struct bifrost_st_vary {
 199         unsigned src0 : 3;
 200         unsigned src1 : 3;
 201         unsigned src2 : 3;
 202         unsigned channels : 2;
 203         unsigned op   : 9;
 204 } __attribute__((packed));
 205
 206 #define BIFROST_ADD_OP_ATEST (0xc8f)
 207
 208 struct bifrost_add_atest {
 209         /* gl_SampleMask (R60) */
 210         unsigned src0 : 3;
 211
 212         /* Alpha value */
 213         unsigned src1 : 3;
 214
 215         /* If half, X/Y select. If !half, always set */
 216         unsigned component : 1;
 217         unsigned half : 1;
 218
 219         unsigned op   : 12;
 220 } __attribute__((packed));
 221
 222 enum bifrost_outmod {
 223         BIFROST_NONE = 0x0,
 224         BIFROST_POS = 0x1,
 225         BIFROST_SAT_SIGNED = 0x2,
 226         BIFROST_SAT = 0x3,
 227 };
 228
 229 enum bifrost_roundmode {
 230         BIFROST_RTE = 0x0, /* round to even */
 231         BIFROST_RTP = 0x1, /* round to positive */
 232         BIFROST_RTN = 0x2, /* round to negative */
 233         BIFROST_RTZ = 0x3 /* round to zero */
 234 };
 235
 236 /* NONE: Same as fmax() and fmin() -- return the other
 237  * number if any number is NaN.  Also always return +0 if
 238  * one argument is +0 and the other is -0.
 239  *
 240  * NAN_WINS: Instead of never returning a NaN, always return
 241  * one. The "greater"/"lesser" NaN is always returned, first
 242  * by checking the sign and then the mantissa bits.
 243  *
 244  * SRC1_WINS: For max, implement src0 > src1 ? src0 : src1.
 245  * For min, implement src0 < src1 ? src0 : src1.  This
 246  * includes handling NaN's and signedness of 0 differently
 247  * from above, since +0 and -0 compare equal and comparisons
 248  * always return false for NaN's. As a result, this mode is
 249  * *not* commutative.
 250  *
 251  * SRC0_WINS: For max, implement src0 < src1 ? src1 : src0
 252  * For min, implement src0 > src1 ? src1 : src0
 253  */
 254
 255
 256 enum bifrost_minmax_mode {
 257         BIFROST_MINMAX_NONE = 0x0,
 258         BIFROST_NAN_WINS    = 0x1,
 259         BIFROST_SRC1_WINS   = 0x2,
 260         BIFROST_SRC0_WINS   = 0x3,
 261 };
 262
 263 #define BIFROST_FMA_OP_FADD32 (0x58 >> 2)
 264 #define BIFROST_FMA_OP_FMAX32 (0x40 >> 2)
 265 #define BIFROST_FMA_OP_FMIN32 (0x44 >> 2)
 266
 267 struct bifrost_fma_add {
 268         unsigned src0 : 3;
 269         unsigned src1 : 3;
 270         unsigned src1_abs : 1;
 271         unsigned src0_neg : 1;
 272         unsigned src1_neg : 1;
 273         unsigned unk : 3;
 274         unsigned src0_abs : 1;
 275         enum bifrost_roundmode roundmode : 2;
 276         enum bifrost_outmod outmod : 2;
 277         unsigned op : 6;
 278 } __attribute__((packed));
 279
 280 #define BIFROST_FMA_OP_FMAX16 (0xC0 >> 2)
 281 #define BIFROST_FMA_OP_FMIN16 (0xCC >> 2)
 282 #define BIFROST_FMA_OP_FADD16 (0xD8 >> 2)
 283
 284 struct bifrost_fma_add_minmax16 {
 285         unsigned src0 : 3;
 286         unsigned src1 : 3;
 287         /* abs2 inferred as (src1 < src0) */
 288         unsigned abs1 : 1;
 289         unsigned src0_neg : 1;
 290         unsigned src1_neg : 1;
 291         unsigned src0_swizzle : 2;
 292         unsigned src1_swizzle : 2;
 293         unsigned mode : 2;
 294         enum bifrost_outmod outmod : 2;
 295         /* roundmode for add, min/max mode for min/max */
 296         unsigned op : 6;
 297 } __attribute__((packed));
 298
 299 #define BIFROST_FMA_OP_FMA (0x00)
 300
 301 struct bifrost_fma_fma {
 302         unsigned src0 : 3;
 303         unsigned src1 : 3;
 304         unsigned src2 : 3;
 305         unsigned src_expand : 3;
 306         unsigned src0_abs : 1;
 307         enum bifrost_roundmode roundmode : 2;
 308         enum bifrost_outmod outmod : 2;
 309         unsigned src0_neg : 1; /* 14 */
 310         unsigned src2_neg : 1;
 311         unsigned src1_abs : 1;
 312         unsigned src2_abs : 1; /* 17 */
 313         unsigned op : 2;
 314 } __attribute__((packed));
 315
 316 #define BIFROST_FMA_OP_FMA16 (0x2)
 317
 318 struct bifrost_fma_fma16 {
 319         unsigned src0 : 3;
 320         unsigned src1 : 3;
 321         unsigned src2 : 3;
 322         unsigned swizzle_0 : 2;
 323         unsigned swizzle_1 : 2;
 324         enum bifrost_roundmode roundmode : 2;
 325         enum bifrost_outmod outmod : 2;
 326         unsigned src0_neg : 1;
 327         unsigned src2_neg : 1;
 328         unsigned swizzle_2 : 2;
 329         unsigned op : 2;
 330 } __attribute__((packed));
 331
 332 enum bifrost_csel_cond {
 333         BIFROST_FEQ_F = 0x0,
 334         BIFROST_FGT_F = 0x1,
 335         BIFROST_FGE_F = 0x2,
 336         BIFROST_IEQ_F = 0x3,
 337         BIFROST_IGT_I = 0x4,
 338         BIFROST_IGE_I = 0x5,
 339         BIFROST_UGT_I = 0x6,
 340         BIFROST_UGE_I = 0x7
 341 };
 342
 343 #define BIFROST_FMA_OP_CSEL4     (0x5c)
 344 #define BIFROST_FMA_OP_CSEL4_V16 (0xdc)
 345
 346 struct bifrost_csel4 {
 347         unsigned src0 : 3;
 348         unsigned src1 : 3;
 349         unsigned src2 : 3;
 350         unsigned src3 : 3;
 351         enum bifrost_csel_cond cond : 3;
 352         unsigned op   : 8;
 353 } __attribute__((packed));
 354
 355 struct bifrost_shift_fma {
 356         unsigned src0 : 3;
 357         unsigned src1 : 3;
 358         unsigned src2 : 3;
 359         unsigned half : 3; /* 000 for i32, 100 for i8, 111 for v2i16 */
 360         unsigned unk  : 1; /* always set? */
 361         unsigned invert_1 : 1; /* Inverts sources to combining op */
 362         /* For XOR, switches RSHIFT to LSHIFT since only one invert needed */
 363         unsigned invert_2 : 1;
 364         unsigned op : 8;
 365 } __attribute__((packed));
 366
 367 struct bifrost_shift_add {
 368         unsigned src0 : 3;
 369         unsigned src1 : 3;
 370         unsigned src2 : 3;
 371         unsigned zero : 2;
 372
 373         unsigned invert_1 : 1;
 374         unsigned invert_2 : 1;
 375
 376         unsigned op : 7;
 377 } __attribute__((packed));
 378
 379 /* Two sources for vectorization */
 380 #define BIFROST_FMA_FLOAT32_TO_16 (0xdd000 >> 3)
 381 #define BIFROST_ADD_FLOAT32_TO_16 (0x0EC00 >> 3)
 382
 383 enum bifrost_convert_mode {
 384         BIFROST_CONV_UNK0 = 0,
 385         BIFROST_CONV_F32_TO_I32 = 1,
 386         BIFROST_CONV_F16_TO_I16 = 2,
 387         BIFROST_CONV_I32_TO_F32 = 3,
 388         BIFROST_CONV_I16_TO_X32 = 4,
 389         BIFROST_CONV_F16_TO_F32 = 5,
 390         BIFROST_CONV_I16_TO_F16 = 6,
 391         BIFROST_CONV_UNK7 = 7
 392 };
 393
 394 /* i16 to x32 */
 395 #define BIFROST_CONVERT_4(is_unsigned, component, to_float) \
 396         ((is_unsigned & 1) | ((component & 1) << 1) | ((to_float & 1) << 2) | \
 397          ((0x3) << 3) | ((4) << 5) | 0x100)
 398
 399 /* f16 to f32 */
 400 #define BIFROST_CONVERT_5(component) \
 401         ((component & 1) | ((1) << 1) | ((5) << 5) | 0x100)
 402
 403 /* Other conversions */
 404 #define BIFROST_CONVERT(is_unsigned, roundmode, swizzle, mode) \
 405         ((is_unsigned & 1) | ((roundmode & 3) << 1) | ((swizzle & 3) << 3) | ((mode & 7) << 5))
 406
 407 #define BIFROST_FMA_CONVERT (0xe0000)
 408 #define BIFROST_ADD_CONVERT (0x07800)
 409
 410 enum bifrost_ldst_type {
 411         BIFROST_LDST_F16 = 0,
 412         BIFROST_LDST_F32 = 1,
 413         BIFROST_LDST_I32 = 2,
 414         BIFROST_LDST_U32 = 3
 415 };
 416
 417 #define BIFROST_ADD_OP_LD_VAR_ADDR (0x18000 >> 10)
 418
 419 struct bifrost_ld_var_addr {
 420         unsigned src0 : 3;
 421         unsigned src1 : 3;
 422         unsigned location : 5;
 423         enum bifrost_ldst_type type : 2;
 424         unsigned op : 7;
 425 } __attribute__((packed));
 426
 427 #define BIFROST_ADD_OP_LD_ATTR (0x08000 >> 12)
 428
 429 struct bifrost_ld_attr {
 430         unsigned src0 : 3;
 431         unsigned src1 : 3;
 432         unsigned location : 5;
 433         unsigned channels : 2; /* MALI_POSITIVE */
 434         enum bifrost_ldst_type type : 2;
 435         unsigned op : 5;
 436 } __attribute__((packed));
 437
 438 enum bifrost_interp_mode {
 439         BIFROST_INTERP_PER_FRAG = 0x0,
 440         BIFROST_INTERP_CENTROID = 0x1,
 441         BIFROST_INTERP_DEFAULT  = 0x2,
 442         BIFROST_INTERP_EXPLICIT = 0x3
 443 };
 444
 445 #define BIFROST_ADD_OP_LD_VAR_16 (0x1a << 1)
 446 #define BIFROST_ADD_OP_LD_VAR_32 (0x0a << 1)
 447
 448 struct bifrost_ld_var {
 449         unsigned src0 : 3;
 450
 451         /* If top two bits set, indirect with src in bottom three */
 452         unsigned addr : 5;
 453
 454         unsigned channels : 2; /* MALI_POSITIVE */
 455         enum bifrost_interp_mode interp_mode : 2;
 456         unsigned reuse : 1;
 457         unsigned flat : 1;
 458         unsigned op : 6;
 459 } __attribute__((packed));
 460
 461 struct bifrost_tex_ctrl {
 462         unsigned sampler_index : 4; // also used to signal indirects
 463         unsigned tex_index : 7;
 464         bool no_merge_index : 1; // whether to merge (direct) sampler & texture indices
 465         bool filter : 1; // use the usual filtering pipeline (0 for texelFetch & textureGather)
 466         unsigned unk0 : 2;
 467         bool texel_offset : 1; // *Offset()
 468         bool is_shadow : 1;
 469         bool is_array : 1;
 470         unsigned tex_type : 2; // 2D, 3D, Cube, Buffer
 471         bool compute_lod : 1; // 0 for *Lod()
 472         bool not_supply_lod : 1; // 0 for *Lod() or when a bias is applied
 473         bool calc_gradients : 1; // 0 for *Grad()
 474         unsigned unk1 : 1;
 475         unsigned result_type : 4; // integer, unsigned, float TODO: why is this 4 bits?
 476         unsigned unk2 : 4;
 477 } __attribute__((packed));
 478
 479 struct bifrost_dual_tex_ctrl {
 480         unsigned sampler_index0 : 2;
 481         unsigned unk0 : 2;
 482         unsigned tex_index0 : 2;
 483         unsigned sampler_index1 : 2;
 484         unsigned tex_index1 : 2;
 485         unsigned unk1 : 22;
 486 } __attribute__((packed));
 487
 488 #define BIFROST_ADD_OP_TEX_COMPACT_F32 (0x0b000 >> 10)
 489 #define BIFROST_ADD_OP_TEX_COMPACT_F16 (0x1b000 >> 10)
 490
 491 struct bifrost_tex_compact {
 492         unsigned src0 : 3;
 493         unsigned src1 : 3;
 494         unsigned tex_index : 3;
 495         unsigned unknown : 1;
 496         unsigned sampler_index : 3;
 497         unsigned op   : 7;
 498 } __attribute__((packed));
 499
 500 enum branch_bit_size {
 501         BR_SIZE_32 = 0,
 502         BR_SIZE_16XX = 1,
 503         BR_SIZE_16YY = 2,
 504         // For the above combinations of bitsize and location, an extra bit is
 505         // encoded via comparing the sources. The only possible source of ambiguity
 506         // would be if the sources were the same, but then the branch condition
 507         // would be always true or always false anyways, so we can ignore it. But
 508         // this no longer works when comparing the y component to the x component,
 509         // since it's valid to compare the y component of a source against its own
 510         // x component. Instead, the extra bit is encoded via an extra bitsize.
 511         BR_SIZE_16YX0 = 3,
 512         BR_SIZE_16YX1 = 4,
 513         BR_SIZE_32_AND_16X = 5,
 514         BR_SIZE_32_AND_16Y = 6,
 515         // Used for comparisons with zero and always-true, see below. I think this
 516         // only works for integer comparisons.
 517         BR_SIZE_ZERO = 7,
 518 };
 519
 520 enum bifrost_reg_write_unit {
 521         REG_WRITE_NONE = 0, // don't write
 522         REG_WRITE_TWO, // write using reg2
 523         REG_WRITE_THREE, // write using reg3
 524 };
 525
 526 struct bifrost_regs {
 527         unsigned uniform_const : 8;
 528         unsigned reg2 : 6;
 529         unsigned reg3 : 6;
 530         unsigned reg0 : 5;
 531         unsigned reg1 : 6;
 532         unsigned ctrl : 4;
 533 } __attribute__((packed));
 534
 535 enum bifrost_branch_cond {
 536         BR_COND_LT = 0,
 537         BR_COND_LE = 1,
 538         BR_COND_GE = 2,
 539         BR_COND_GT = 3,
 540         // Equal vs. not-equal determined by src0/src1 comparison
 541         BR_COND_EQ = 4,
 542         // floating-point comparisons
 543         // Becomes UNE when you flip the arguments
 544         BR_COND_OEQ = 5,
 545         // TODO what happens when you flip the arguments?
 546         BR_COND_OGT = 6,
 547         BR_COND_OLT = 7,
 548 };
 549
 550 enum bifrost_branch_code {
 551         BR_ALWAYS = 63,
 552 };
 553
 554 struct bifrost_branch {
 555         unsigned src0 : 3;
 556
 557         /* For BR_SIZE_ZERO, upper two bits become ctrl */
 558         unsigned src1 : 3;
 559
 560         /* Offset source -- always uniform/const but
 561          * theoretically could support indirect jumps? */
 562         unsigned src2 : 3;
 563
 564         enum bifrost_branch_cond cond : 3;
 565         enum branch_bit_size size : 3;
 566
 567         unsigned op : 5;
 568 };
 569
 570 /* Clause packing */
 571
 572 #define BIFROST_FMA_NOP (0x701960 | BIFROST_SRC_STAGE)
 573 #define BIFROST_ADD_NOP (0x3D960 | BIFROST_SRC_STAGE)
 574
 575 struct bifrost_fmt1 {
 576         unsigned ins_0 : 3;
 577         unsigned tag : 5;
 578         uint64_t ins_1 : 64;
 579         unsigned ins_2 : 11;
 580         uint64_t header : 45;
 581 } __attribute__((packed));
 582
 583 #define BIFROST_FMT1_INSTRUCTIONS    0b00101
 584 #define BIFROST_FMT1_FINAL           0b01001
 585 #define BIFROST_FMT1_CONSTANTS       0b00001
 586
 587 #define BIFROST_FMTC_CONSTANTS       0b0011
 588 #define BIFROST_FMTC_FINAL           0b0111
 589
 590 struct bifrost_fmt_constant {
 591         unsigned pos : 4;
 592         unsigned tag : 4;
 593         uint64_t imm_1 : 60;
 594         uint64_t imm_2 : 60;
 595 } __attribute__((packed));
 596
 597 enum bifrost_reg_control {
 598         BIFROST_WRITE_FMA_P2         = 1,
 599         BIFROST_WRITE_FMA_P2_READ_P3 = 2,
 600         BIFROST_FIRST_WRITE_FMA_P2_READ_P3 = 3,
 601         BIFROST_READ_P3              = 4,
 602         BIFROST_WRITE_ADD_P2         = 5,
 603         BIFROST_WRITE_ADD_P2_READ_P3 = 6,
 604         BIFROST_WRITE_ADD_P2_FMA_P3  = 7,
 605
 606         BIFROST_FIRST_NONE           = 8,
 607         BIFROST_FIRST_WRITE_FMA_P2   = 9,
 608         /* INSTR_INVALID_ENC */
 609         BIFROST_REG_NONE             = 11,
 610         BIFROST_FIRST_READ_P3        = 12,
 611         BIFROST_FIRST_WRITE_ADD_P2   = 13,
 612         BIFROST_FIRST_WRITE_ADD_P2_READ_P3 = 14,
 613         BIFROST_FIRST_WRITE_ADD_P2_FMA_P3  = 15
 614 };
 615
 616 #endif