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
 103 struct bifrost_fma_inst {
 104         unsigned src0 : 3;
 105         unsigned op   : 20;
 106 } __attribute__((packed));
 107
 108 struct bifrost_fma_2src {
 109         unsigned src0 : 3;
 110         unsigned src1 : 3;
 111         unsigned op   : 17;
 112 } __attribute__((packed));
 113
 114 #define BIFROST_FMA_OP_MSCALE (0x50 >> 3)
 115
 116 struct bifrost_fma_mscale {
 117         unsigned src0 : 3;
 118         unsigned src1 : 3;
 119         unsigned src2 : 3;
 120         unsigned src3 : 3;
 121
 122         /* If mscale_mode is set - an MSCALE specific mode. If it is not set, a
 123          * regular outmod */
 124         unsigned mode : 2;
 125         unsigned mscale_mode : 1;
 126
 127         unsigned src0_abs : 1;
 128         unsigned src1_neg : 1;
 129         unsigned src2_neg : 1;
 130         unsigned op   : 5;
 131 } __attribute__((packed));
 132
 133 #define BIFROST_ADD_OP_BLEND (0x1952c)
 134 #define BIFROST_ADD_OP_FRCP_FAST_F32 (0x0cc00)
 135 #define BIFROST_ADD_OP_FRCP_FAST_F16_X (0x0ce10)
 136 #define BIFROST_ADD_OP_FRCP_FAST_F16_Y (0x0ce30)
 137 #define BIFROST_ADD_OP_FRSQ_FAST_F32 (0x0cc20)
 138 #define BIFROST_ADD_OP_FRSQ_FAST_F16_X (0x0ce50)
 139 #define BIFROST_ADD_OP_FRSQ_FAST_F16_Y (0x0ce70)
 140 #define BIFROST_ADD_OP_LOG2_HELP  (0x0cc68)
 141 #define BIFROST_ADD_OP_FEXP2_FAST (0x0cd58)
 142
 143 struct bifrost_add_inst {
 144         unsigned src0 : 3;
 145         unsigned op   : 17;
 146 } __attribute__((packed));
 147
 148 #define BIFROST_ADD_OP_LD_UBO_1 (0x0c1a0 >> 3)
 149 #define BIFROST_ADD_OP_LD_UBO_2 (0x0c1e0 >> 3)
 150 #define BIFROST_ADD_OP_LD_UBO_3 (0x0caa0 >> 3)
 151 #define BIFROST_ADD_OP_LD_UBO_4 (0x0c220 >> 3)
 152
 153 struct bifrost_add_2src {
 154         unsigned src0 : 3;
 155         unsigned src1 : 3;
 156         unsigned op   : 14;
 157 } __attribute__((packed));
 158
 159 #define BIFROST_ADD_OP_FMAX32 (0x00)
 160 #define BIFROST_ADD_OP_FMIN32 (0x01)
 161 #define BIFROST_ADD_OP_FADD32 (0x02)
 162
 163 #define BIFROST_ADD_OP_FADD16 (0x0A)
 164
 165 struct bifrost_add_faddmin {
 166         unsigned src0 : 3;
 167         unsigned src1 : 3;
 168         unsigned src1_abs : 1;
 169         unsigned src0_neg : 1;
 170         unsigned src1_neg : 1;
 171         unsigned select : 2; /* swizzle_0 for fp16 */
 172         unsigned outmod : 2; /* swizzle_1 for fp16 */
 173         unsigned mode : 2;
 174         unsigned src0_abs : 1;
 175         unsigned op   : 4;
 176 } __attribute__((packed));
 177
 178 #define BIFROST_ADD_OP_FMAX16 (0x10)
 179 #define BIFROST_ADD_OP_FMIN16 (0x12)
 180
 181 struct bifrost_add_fmin16 {
 182         unsigned src0 : 3;
 183         unsigned src1 : 3;
 184         /* abs2 inferred as with FMA */
 185         unsigned abs1 : 1;
 186         unsigned src0_neg : 1;
 187         unsigned src1_neg : 1;
 188         unsigned src0_swizzle : 2;
 189         unsigned src1_swizzle : 2;
 190         unsigned mode : 2;
 191         unsigned op : 5;
 192 } __attribute__((packed));
 193
 194 #define BIFROST_ADD_OP_ST_VAR (0x19300 >> 8)
 195
 196 struct bifrost_st_vary {
 197         unsigned src0 : 3;
 198         unsigned src1 : 3;
 199         unsigned src2 : 3;
 200         unsigned channels : 2;
 201         unsigned op   : 9;
 202 } __attribute__((packed));
 203
 204 #define BIFROST_ADD_OP_ATEST (0xc8f)
 205
 206 struct bifrost_add_atest {
 207         /* gl_SampleMask (R60) */
 208         unsigned src0 : 3;
 209
 210         /* Alpha value */
 211         unsigned src1 : 3;
 212
 213         /* If half, X/Y select. If !half, always set */
 214         unsigned component : 1;
 215         unsigned half : 1;
 216
 217         unsigned op   : 12;
 218 } __attribute__((packed));
 219
 220 enum bifrost_outmod {
 221         BIFROST_NONE = 0x0,
 222         BIFROST_POS = 0x1,
 223         BIFROST_SAT_SIGNED = 0x2,
 224         BIFROST_SAT = 0x3,
 225 };
 226
 227 enum bifrost_roundmode {
 228         BIFROST_RTE = 0x0, /* round to even */
 229         BIFROST_RTP = 0x1, /* round to positive */
 230         BIFROST_RTN = 0x2, /* round to negative */
 231         BIFROST_RTZ = 0x3 /* round to zero */
 232 };
 233
 234 /* NONE: Same as fmax() and fmin() -- return the other
 235  * number if any number is NaN.  Also always return +0 if
 236  * one argument is +0 and the other is -0.
 237  *
 238  * NAN_WINS: Instead of never returning a NaN, always return
 239  * one. The "greater"/"lesser" NaN is always returned, first
 240  * by checking the sign and then the mantissa bits.
 241  *
 242  * SRC1_WINS: For max, implement src0 > src1 ? src0 : src1.
 243  * For min, implement src0 < src1 ? src0 : src1.  This
 244  * includes handling NaN's and signedness of 0 differently
 245  * from above, since +0 and -0 compare equal and comparisons
 246  * always return false for NaN's. As a result, this mode is
 247  * *not* commutative.
 248  *
 249  * SRC0_WINS: For max, implement src0 < src1 ? src1 : src0
 250  * For min, implement src0 > src1 ? src1 : src0
 251  */
 252
 253
 254 enum bifrost_minmax_mode {
 255         BIFROST_MINMAX_NONE = 0x0,
 256         BIFROST_NAN_WINS    = 0x1,
 257         BIFROST_SRC1_WINS   = 0x2,
 258         BIFROST_SRC0_WINS   = 0x3,
 259 };
 260
 261 #define BIFROST_FMA_OP_FADD32 (0x58 >> 2)
 262 #define BIFROST_FMA_OP_FMAX32 (0x40 >> 2)
 263 #define BIFROST_FMA_OP_FMIN32 (0x44 >> 2)
 264
 265 struct bifrost_fma_add {
 266         unsigned src0 : 3;
 267         unsigned src1 : 3;
 268         unsigned src1_abs : 1;
 269         unsigned src0_neg : 1;
 270         unsigned src1_neg : 1;
 271         unsigned unk : 3;
 272         unsigned src0_abs : 1;
 273         enum bifrost_roundmode roundmode : 2;
 274         enum bifrost_outmod outmod : 2;
 275         unsigned op : 6;
 276 } __attribute__((packed));
 277
 278 #define BIFROST_FMA_OP_FMAX16 (0xC0 >> 2)
 279 #define BIFROST_FMA_OP_FMIN16 (0xCC >> 2)
 280 #define BIFROST_FMA_OP_FADD16 (0xD8 >> 2)
 281
 282 struct bifrost_fma_add_minmax16 {
 283         unsigned src0 : 3;
 284         unsigned src1 : 3;
 285         /* abs2 inferred as (src1 < src0) */
 286         unsigned abs1 : 1;
 287         unsigned src0_neg : 1;
 288         unsigned src1_neg : 1;
 289         unsigned src0_swizzle : 2;
 290         unsigned src1_swizzle : 2;
 291         unsigned mode : 2;
 292         enum bifrost_outmod outmod : 2;
 293         /* roundmode for add, min/max mode for min/max */
 294         unsigned op : 6;
 295 } __attribute__((packed));
 296
 297 #define BIFROST_FMA_OP_FMA (0x00)
 298
 299 struct bifrost_fma_fma {
 300         unsigned src0 : 3;
 301         unsigned src1 : 3;
 302         unsigned src2 : 3;
 303         unsigned src_expand : 3;
 304         unsigned src0_abs : 1;
 305         enum bifrost_roundmode roundmode : 2;
 306         enum bifrost_outmod outmod : 2;
 307         unsigned src0_neg : 1; /* 14 */
 308         unsigned src2_neg : 1;
 309         unsigned src1_abs : 1;
 310         unsigned src2_abs : 1; /* 17 */
 311         unsigned op : 2;
 312 } __attribute__((packed));
 313
 314 #define BIFROST_FMA_OP_FMA16 (0x2)
 315
 316 struct bifrost_fma_fma16 {
 317         unsigned src0 : 3;
 318         unsigned src1 : 3;
 319         unsigned src2 : 3;
 320         unsigned swizzle_0 : 2;
 321         unsigned swizzle_1 : 2;
 322         enum bifrost_roundmode roundmode : 2;
 323         enum bifrost_outmod outmod : 2;
 324         unsigned src0_neg : 1;
 325         unsigned src2_neg : 1;
 326         unsigned swizzle_2 : 2;
 327         unsigned op : 2;
 328 } __attribute__((packed));
 329
 330 enum bifrost_csel_cond {
 331         BIFROST_FEQ_F = 0x0,
 332         BIFROST_FGT_F = 0x1,
 333         BIFROST_FGE_F = 0x2,
 334         BIFROST_IEQ_F = 0x3,
 335         BIFROST_IGT_I = 0x4,
 336         BIFROST_IGE_I = 0x5,
 337         BIFROST_UGT_I = 0x6,
 338         BIFROST_UGE_I = 0x7
 339 };
 340
 341 #define BIFROST_FMA_OP_CSEL4     (0x5c)
 342 #define BIFROST_FMA_OP_CSEL4_V16 (0xdc)
 343
 344 struct bifrost_csel4 {
 345         unsigned src0 : 3;
 346         unsigned src1 : 3;
 347         unsigned src2 : 3;
 348         unsigned src3 : 3;
 349         enum bifrost_csel_cond cond : 3;
 350         unsigned op   : 8;
 351 } __attribute__((packed));
 352
 353 struct bifrost_shift_fma {
 354         unsigned src0 : 3;
 355         unsigned src1 : 3;
 356         unsigned src2 : 3;
 357         unsigned half : 3; /* 000 for i32, 100 for i8, 111 for v2i16 */
 358         unsigned unk  : 1; /* always set? */
 359         unsigned invert_1 : 1; /* Inverts sources to combining op */
 360         /* For XOR, switches RSHIFT to LSHIFT since only one invert needed */
 361         unsigned invert_2 : 1;
 362         unsigned op : 8;
 363 } __attribute__((packed));
 364
 365 struct bifrost_shift_add {
 366         unsigned src0 : 3;
 367         unsigned src1 : 3;
 368         unsigned src2 : 3;
 369         unsigned zero : 2;
 370
 371         unsigned invert_1 : 1;
 372         unsigned invert_2 : 1;
 373
 374         unsigned op : 7;
 375 } __attribute__((packed));
 376
 377 /* Two sources for vectorization */
 378 #define BIFROST_FMA_FLOAT32_TO_16 (0xdd000 >> 3)
 379 #define BIFROST_ADD_FLOAT32_TO_16 (0x0EC00 >> 3)
 380
 381 enum bifrost_convert_mode {
 382         BIFROST_CONV_UNK0 = 0,
 383         BIFROST_CONV_F32_TO_I32 = 1,
 384         BIFROST_CONV_F16_TO_I16 = 2,
 385         BIFROST_CONV_I32_TO_F32 = 3,
 386         BIFROST_CONV_I16_TO_X32 = 4,
 387         BIFROST_CONV_F16_TO_F32 = 5,
 388         BIFROST_CONV_I16_TO_F16 = 6,
 389         BIFROST_CONV_UNK7 = 7
 390 };
 391
 392 /* i16 to x32 */
 393 #define BIFROST_CONVERT_4(is_unsigned, component, to_float) \
 394         ((is_unsigned & 1) | ((component & 1) << 1) | ((to_float & 1) << 2) | \
 395          ((0x3) << 3) | ((4) << 5) | 0x100)
 396
 397 /* f16 to f32 */
 398 #define BIFROST_CONVERT_5(component) \
 399         ((component & 1) | ((1) << 1) | ((5) << 5) | 0x100)
 400
 401 /* Other conversions */
 402 #define BIFROST_CONVERT(is_unsigned, roundmode, swizzle, mode) \
 403         ((is_unsigned & 1) | ((roundmode & 3) << 1) | ((swizzle & 3) << 3) | ((mode & 7) << 5))
 404
 405 #define BIFROST_FMA_CONVERT (0xe0000)
 406 #define BIFROST_ADD_CONVERT (0x07800)
 407
 408 enum bifrost_ldst_type {
 409         BIFROST_LDST_F16 = 0,
 410         BIFROST_LDST_F32 = 1,
 411         BIFROST_LDST_I32 = 2,
 412         BIFROST_LDST_U32 = 3
 413 };
 414
 415 #define BIFROST_ADD_OP_LD_VAR_ADDR (0x18000 >> 10)
 416
 417 struct bifrost_ld_var_addr {
 418         unsigned src0 : 3;
 419         unsigned src1 : 3;
 420         unsigned location : 5;
 421         enum bifrost_ldst_type type : 2;
 422         unsigned op : 7;
 423 } __attribute__((packed));
 424
 425 #define BIFROST_ADD_OP_LD_ATTR (0x08000 >> 12)
 426
 427 struct bifrost_ld_attr {
 428         unsigned src0 : 3;
 429         unsigned src1 : 3;
 430         unsigned location : 5;
 431         unsigned channels : 2; /* MALI_POSITIVE */
 432         enum bifrost_ldst_type type : 2;
 433         unsigned op : 5;
 434 } __attribute__((packed));
 435
 436 enum bifrost_interp_mode {
 437         BIFROST_INTERP_PER_FRAG = 0x0,
 438         BIFROST_INTERP_CENTROID = 0x1,
 439         BIFROST_INTERP_DEFAULT  = 0x2,
 440         BIFROST_INTERP_EXPLICIT = 0x3
 441 };
 442
 443 #define BIFROST_ADD_OP_LD_VAR_16 (0x1a << 1)
 444 #define BIFROST_ADD_OP_LD_VAR_32 (0x0a << 1)
 445
 446 struct bifrost_ld_var {
 447         unsigned src0 : 3;
 448
 449         /* If top two bits set, indirect with src in bottom three */
 450         unsigned addr : 5;
 451
 452         unsigned channels : 2; /* MALI_POSITIVE */
 453         enum bifrost_interp_mode interp_mode : 2;
 454         unsigned reuse : 1;
 455         unsigned flat : 1;
 456         unsigned op : 6;
 457 } __attribute__((packed));
 458
 459 struct bifrost_tex_ctrl {
 460         unsigned sampler_index : 4; // also used to signal indirects
 461         unsigned tex_index : 7;
 462         bool no_merge_index : 1; // whether to merge (direct) sampler & texture indices
 463         bool filter : 1; // use the usual filtering pipeline (0 for texelFetch & textureGather)
 464         unsigned unk0 : 2;
 465         bool texel_offset : 1; // *Offset()
 466         bool is_shadow : 1;
 467         bool is_array : 1;
 468         unsigned tex_type : 2; // 2D, 3D, Cube, Buffer
 469         bool compute_lod : 1; // 0 for *Lod()
 470         bool not_supply_lod : 1; // 0 for *Lod() or when a bias is applied
 471         bool calc_gradients : 1; // 0 for *Grad()
 472         unsigned unk1 : 1;
 473         unsigned result_type : 4; // integer, unsigned, float TODO: why is this 4 bits?
 474         unsigned unk2 : 4;
 475 } __attribute__((packed));
 476
 477 struct bifrost_dual_tex_ctrl {
 478         unsigned sampler_index0 : 2;
 479         unsigned unk0 : 2;
 480         unsigned tex_index0 : 2;
 481         unsigned sampler_index1 : 2;
 482         unsigned tex_index1 : 2;
 483         unsigned unk1 : 22;
 484 } __attribute__((packed));
 485
 486 #define BIFROST_ADD_OP_TEX_COMPACT_F32 (0x0b000 >> 10)
 487 #define BIFROST_ADD_OP_TEX_COMPACT_F16 (0x1b000 >> 10)
 488
 489 struct bifrost_tex_compact {
 490         unsigned src0 : 3;
 491         unsigned src1 : 3;
 492         unsigned tex_index : 3;
 493         unsigned unknown : 1;
 494         unsigned sampler_index : 3;
 495         unsigned op   : 7;
 496 } __attribute__((packed));
 497
 498 enum branch_bit_size {
 499         BR_SIZE_32 = 0,
 500         BR_SIZE_16XX = 1,
 501         BR_SIZE_16YY = 2,
 502         // For the above combinations of bitsize and location, an extra bit is
 503         // encoded via comparing the sources. The only possible source of ambiguity
 504         // would be if the sources were the same, but then the branch condition
 505         // would be always true or always false anyways, so we can ignore it. But
 506         // this no longer works when comparing the y component to the x component,
 507         // since it's valid to compare the y component of a source against its own
 508         // x component. Instead, the extra bit is encoded via an extra bitsize.
 509         BR_SIZE_16YX0 = 3,
 510         BR_SIZE_16YX1 = 4,
 511         BR_SIZE_32_AND_16X = 5,
 512         BR_SIZE_32_AND_16Y = 6,
 513         // Used for comparisons with zero and always-true, see below. I think this
 514         // only works for integer comparisons.
 515         BR_SIZE_ZERO = 7,
 516 };
 517
 518 enum bifrost_reg_write_unit {
 519         REG_WRITE_NONE = 0, // don't write
 520         REG_WRITE_TWO, // write using reg2
 521         REG_WRITE_THREE, // write using reg3
 522 };
 523
 524 struct bifrost_regs {
 525         unsigned uniform_const : 8;
 526         unsigned reg2 : 6;
 527         unsigned reg3 : 6;
 528         unsigned reg0 : 5;
 529         unsigned reg1 : 6;
 530         unsigned ctrl : 4;
 531 } __attribute__((packed));
 532
 533 enum bifrost_branch_cond {
 534         BR_COND_LT = 0,
 535         BR_COND_LE = 1,
 536         BR_COND_GE = 2,
 537         BR_COND_GT = 3,
 538         // Equal vs. not-equal determined by src0/src1 comparison
 539         BR_COND_EQ = 4,
 540         // floating-point comparisons
 541         // Becomes UNE when you flip the arguments
 542         BR_COND_OEQ = 5,
 543         // TODO what happens when you flip the arguments?
 544         BR_COND_OGT = 6,
 545         BR_COND_OLT = 7,
 546 };
 547
 548 enum bifrost_branch_code {
 549         BR_ALWAYS = 63,
 550 };
 551
 552 struct bifrost_branch {
 553         unsigned src0 : 3;
 554
 555         /* For BR_SIZE_ZERO, upper two bits become ctrl */
 556         unsigned src1 : 3;
 557
 558         /* Offset source -- always uniform/const but
 559          * theoretically could support indirect jumps? */
 560         unsigned src2 : 3;
 561
 562         enum bifrost_branch_cond cond : 3;
 563         enum branch_bit_size size : 3;
 564
 565         unsigned op : 5;
 566 };
 567
 568 /* Clause packing */
 569
 570 #define BIFROST_FMA_NOP (0x701960 | BIFROST_SRC_STAGE)
 571 #define BIFROST_ADD_NOP (0x3D960 | BIFROST_SRC_STAGE)
 572
 573 struct bifrost_fmt1 {
 574         unsigned ins_0 : 3;
 575         unsigned tag : 5;
 576         uint64_t ins_1 : 64;
 577         unsigned ins_2 : 11;
 578         uint64_t header : 45;
 579 } __attribute__((packed));
 580
 581 #define BIFROST_FMT1_INSTRUCTIONS    0b00101
 582 #define BIFROST_FMT1_FINAL           0b01001
 583 #define BIFROST_FMT1_CONSTANTS       0b00001
 584
 585 #define BIFROST_FMTC_CONSTANTS       0b0011
 586 #define BIFROST_FMTC_FINAL           0b0111
 587
 588 struct bifrost_fmt_constant {
 589         unsigned pos : 4;
 590         unsigned tag : 4;
 591         uint64_t imm_1 : 60;
 592         uint64_t imm_2 : 60;
 593 } __attribute__((packed));
 594
 595 enum bifrost_reg_control {
 596         BIFROST_WRITE_FMA_P2         = 1,
 597         BIFROST_WRITE_FMA_P2_READ_P3 = 2,
 598         BIFROST_FIRST_WRITE_FMA_P2_READ_P3 = 3,
 599         BIFROST_READ_P3              = 4,
 600         BIFROST_WRITE_ADD_P2         = 5,
 601         BIFROST_WRITE_ADD_P2_READ_P3 = 6,
 602         BIFROST_WRITE_ADD_P2_FMA_P3  = 7,
 603
 604         BIFROST_FIRST_NONE           = 8,
 605         BIFROST_FIRST_WRITE_FMA_P2   = 9,
 606         /* INSTR_INVALID_ENC */
 607         BIFROST_REG_NONE             = 11,
 608         BIFROST_FIRST_READ_P3        = 12,
 609         BIFROST_FIRST_WRITE_ADD_P2   = 13,
 610         BIFROST_FIRST_WRITE_ADD_P2_READ_P3 = 14,
 611         BIFROST_FIRST_WRITE_ADD_P2_FMA_P3  = 15
 612 };
 613
 614 #endif