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 #define BIFROST_FMA_ROUND_16(mode, swiz) (BIFROST_FMA_EXT | 0x1800 | (swiz) | ((mode) << 6))
 105 #define BIFROST_FMA_ROUND_32(mode) (BIFROST_FMA_EXT | 0x1805 | ((mode) << 6))
 106
 107 struct bifrost_fma_inst {
 108         unsigned src0 : 3;
 109         unsigned op   : 20;
 110 } __attribute__((packed));
 111
 112 struct bifrost_fma_2src {
 113         unsigned src0 : 3;
 114         unsigned src1 : 3;
 115         unsigned op   : 17;
 116 } __attribute__((packed));
 117
 118 #define BIFROST_FMA_OP_SEL8 (0x71)
 119
 120 struct bifrost_fma_sel8 {
 121         unsigned src0 : 3;
 122         unsigned src1 : 3;
 123         unsigned src2 : 3;
 124         unsigned src3 : 3;
 125         unsigned swizzle : 4;
 126         unsigned op   : 7;
 127 } __attribute__((packed));
 128
 129 #define BIFROST_FMA_OP_MSCALE (0x50 >> 3)
 130
 131 struct bifrost_fma_mscale {
 132         unsigned src0 : 3;
 133         unsigned src1 : 3;
 134         unsigned src2 : 3;
 135         unsigned src3 : 3;
 136
 137         /* If mscale_mode is set - an MSCALE specific mode. If it is not set, a
 138          * regular outmod */
 139         unsigned mode : 2;
 140         unsigned mscale_mode : 1;
 141
 142         unsigned src0_abs : 1;
 143         unsigned src1_neg : 1;
 144         unsigned src2_neg : 1;
 145         unsigned op   : 5;
 146 } __attribute__((packed));
 147
 148 #define BIFROST_ADD_OP_BLEND (0x1952c)
 149 #define BIFROST_ADD_OP_FRCP_FAST_F32 (0x0cc00)
 150 #define BIFROST_ADD_OP_FRCP_FAST_F16_X (0x0ce10)
 151 #define BIFROST_ADD_OP_FRCP_FAST_F16_Y (0x0ce30)
 152 #define BIFROST_ADD_OP_FRSQ_FAST_F32 (0x0cc20)
 153 #define BIFROST_ADD_OP_FRSQ_FAST_F16_X (0x0ce50)
 154 #define BIFROST_ADD_OP_FRSQ_FAST_F16_Y (0x0ce70)
 155 #define BIFROST_ADD_OP_LOG2_HELP  (0x0cc68)
 156 #define BIFROST_ADD_OP_FEXP2_FAST (0x0cd58)
 157
 158 struct bifrost_add_inst {
 159         unsigned src0 : 3;
 160         unsigned op   : 17;
 161 } __attribute__((packed));
 162
 163 #define BIFROST_ADD_OP_LD_UBO_1 (0x0c1a0 >> 3)
 164 #define BIFROST_ADD_OP_LD_UBO_2 (0x0c1e0 >> 3)
 165 #define BIFROST_ADD_OP_LD_UBO_3 (0x0caa0 >> 3)
 166 #define BIFROST_ADD_OP_LD_UBO_4 (0x0c220 >> 3)
 167 #define BIFROST_ADD_SEL_16(swiz) ((0xea60 >> 3) | (swiz))
 168
 169 struct bifrost_add_2src {
 170         unsigned src0 : 3;
 171         unsigned src1 : 3;
 172         unsigned op   : 14;
 173 } __attribute__((packed));
 174
 175 #define BIFROST_ADD_OP_FMAX32 (0x00)
 176 #define BIFROST_ADD_OP_FMIN32 (0x01)
 177 #define BIFROST_ADD_OP_FADD32 (0x02)
 178
 179 #define BIFROST_ADD_OP_FADD16 (0x0A)
 180
 181 struct bifrost_add_faddmin {
 182         unsigned src0 : 3;
 183         unsigned src1 : 3;
 184         unsigned src1_abs : 1;
 185         unsigned src0_neg : 1;
 186         unsigned src1_neg : 1;
 187         unsigned select : 2; /* swizzle_0 for fp16 */
 188         unsigned outmod : 2; /* swizzle_1 for fp16 */
 189         unsigned mode : 2;
 190         unsigned src0_abs : 1;
 191         unsigned op   : 4;
 192 } __attribute__((packed));
 193
 194 #define BIFROST_ADD_OP_FMAX16 (0x10)
 195 #define BIFROST_ADD_OP_FMIN16 (0x12)
 196
 197 struct bifrost_add_fmin16 {
 198         unsigned src0 : 3;
 199         unsigned src1 : 3;
 200         /* abs2 inferred as with FMA */
 201         unsigned abs1 : 1;
 202         unsigned src0_neg : 1;
 203         unsigned src1_neg : 1;
 204         unsigned src0_swizzle : 2;
 205         unsigned src1_swizzle : 2;
 206         unsigned mode : 2;
 207         unsigned op : 5;
 208 } __attribute__((packed));
 209
 210 #define BIFROST_ADD_OP_ST_VAR (0x19300 >> 8)
 211
 212 struct bifrost_st_vary {
 213         unsigned src0 : 3;
 214         unsigned src1 : 3;
 215         unsigned src2 : 3;
 216         unsigned channels : 2;
 217         unsigned op   : 9;
 218 } __attribute__((packed));
 219
 220 #define BIFROST_ADD_OP_ATEST (0xc8f)
 221
 222 struct bifrost_add_atest {
 223         /* gl_SampleMask (R60) */
 224         unsigned src0 : 3;
 225
 226         /* Alpha value */
 227         unsigned src1 : 3;
 228
 229         /* If half, X/Y select. If !half, always set */
 230         unsigned component : 1;
 231         unsigned half : 1;
 232
 233         unsigned op   : 12;
 234 } __attribute__((packed));
 235
 236 enum bifrost_outmod {
 237         BIFROST_NONE = 0x0,
 238         BIFROST_POS = 0x1,
 239         BIFROST_SAT_SIGNED = 0x2,
 240         BIFROST_SAT = 0x3,
 241 };
 242
 243 enum bifrost_roundmode {
 244         BIFROST_RTE = 0x0, /* round to even */
 245         BIFROST_RTP = 0x1, /* round to positive */
 246         BIFROST_RTN = 0x2, /* round to negative */
 247         BIFROST_RTZ = 0x3 /* round to zero */
 248 };
 249
 250 /* NONE: Same as fmax() and fmin() -- return the other
 251  * number if any number is NaN.  Also always return +0 if
 252  * one argument is +0 and the other is -0.
 253  *
 254  * NAN_WINS: Instead of never returning a NaN, always return
 255  * one. The "greater"/"lesser" NaN is always returned, first
 256  * by checking the sign and then the mantissa bits.
 257  *
 258  * SRC1_WINS: For max, implement src0 > src1 ? src0 : src1.
 259  * For min, implement src0 < src1 ? src0 : src1.  This
 260  * includes handling NaN's and signedness of 0 differently
 261  * from above, since +0 and -0 compare equal and comparisons
 262  * always return false for NaN's. As a result, this mode is
 263  * *not* commutative.
 264  *
 265  * SRC0_WINS: For max, implement src0 < src1 ? src1 : src0
 266  * For min, implement src0 > src1 ? src1 : src0
 267  */
 268
 269
 270 enum bifrost_minmax_mode {
 271         BIFROST_MINMAX_NONE = 0x0,
 272         BIFROST_NAN_WINS    = 0x1,
 273         BIFROST_SRC1_WINS   = 0x2,
 274         BIFROST_SRC0_WINS   = 0x3,
 275 };
 276
 277 #define BIFROST_FMA_OP_FADD32 (0x58 >> 2)
 278 #define BIFROST_FMA_OP_FMAX32 (0x40 >> 2)
 279 #define BIFROST_FMA_OP_FMIN32 (0x44 >> 2)
 280
 281 struct bifrost_fma_add {
 282         unsigned src0 : 3;
 283         unsigned src1 : 3;
 284         unsigned src1_abs : 1;
 285         unsigned src0_neg : 1;
 286         unsigned src1_neg : 1;
 287         unsigned unk : 3;
 288         unsigned src0_abs : 1;
 289         enum bifrost_roundmode roundmode : 2;
 290         enum bifrost_outmod outmod : 2;
 291         unsigned op : 6;
 292 } __attribute__((packed));
 293
 294 #define BIFROST_FMA_OP_FMAX16 (0xC0 >> 2)
 295 #define BIFROST_FMA_OP_FMIN16 (0xCC >> 2)
 296 #define BIFROST_FMA_OP_FADD16 (0xD8 >> 2)
 297
 298 struct bifrost_fma_add_minmax16 {
 299         unsigned src0 : 3;
 300         unsigned src1 : 3;
 301         /* abs2 inferred as (src1 < src0) */
 302         unsigned abs1 : 1;
 303         unsigned src0_neg : 1;
 304         unsigned src1_neg : 1;
 305         unsigned src0_swizzle : 2;
 306         unsigned src1_swizzle : 2;
 307         unsigned mode : 2;
 308         enum bifrost_outmod outmod : 2;
 309         /* roundmode for add, min/max mode for min/max */
 310         unsigned op : 6;
 311 } __attribute__((packed));
 312
 313 #define BIFROST_FMA_OP_FMA (0x00)
 314
 315 struct bifrost_fma_fma {
 316         unsigned src0 : 3;
 317         unsigned src1 : 3;
 318         unsigned src2 : 3;
 319         unsigned src_expand : 3;
 320         unsigned src0_abs : 1;
 321         enum bifrost_roundmode roundmode : 2;
 322         enum bifrost_outmod outmod : 2;
 323         unsigned src0_neg : 1; /* 14 */
 324         unsigned src2_neg : 1;
 325         unsigned src1_abs : 1;
 326         unsigned src2_abs : 1; /* 17 */
 327         unsigned op : 2;
 328 } __attribute__((packed));
 329
 330 #define BIFROST_FMA_OP_FMA16 (0x2)
 331
 332 struct bifrost_fma_fma16 {
 333         unsigned src0 : 3;
 334         unsigned src1 : 3;
 335         unsigned src2 : 3;
 336         unsigned swizzle_0 : 2;
 337         unsigned swizzle_1 : 2;
 338         enum bifrost_roundmode roundmode : 2;
 339         enum bifrost_outmod outmod : 2;
 340         unsigned src0_neg : 1;
 341         unsigned src2_neg : 1;
 342         unsigned swizzle_2 : 2;
 343         unsigned op : 2;
 344 } __attribute__((packed));
 345
 346 enum bifrost_csel_cond {
 347         BIFROST_FEQ_F = 0x0,
 348         BIFROST_FGT_F = 0x1,
 349         BIFROST_FGE_F = 0x2,
 350         BIFROST_IEQ_F = 0x3,
 351         BIFROST_IGT_I = 0x4,
 352         BIFROST_IGE_I = 0x5,
 353         BIFROST_UGT_I = 0x6,
 354         BIFROST_UGE_I = 0x7
 355 };
 356
 357 #define BIFROST_FMA_OP_CSEL4     (0x5c)
 358 #define BIFROST_FMA_OP_CSEL4_V16 (0xdc)
 359
 360 struct bifrost_csel4 {
 361         unsigned src0 : 3;
 362         unsigned src1 : 3;
 363         unsigned src2 : 3;
 364         unsigned src3 : 3;
 365         enum bifrost_csel_cond cond : 3;
 366         unsigned op   : 8;
 367 } __attribute__((packed));
 368
 369 #define BIFROST_FMA_OP_RSHIFT_NAND     (0x60000 >> 12)
 370 #define BIFROST_FMA_OP_RSHIFT_AND      (0x61000 >> 12)
 371 #define BIFROST_FMA_OP_LSHIFT_NAND     (0x62000 >> 12)
 372 #define BIFROST_FMA_OP_LSHIFT_AND      (0x63000 >> 12)
 373 #define BIFROST_FMA_OP_RSHIFT_XOR      (0x64000 >> 12)
 374 #define BIFROST_FMA_OP_LSHIFT_ADD_32   (0x65200 >> 6)
 375 #define BIFROST_FMA_OP_LSHIFT_SUB_32   (0x65600 >> 6)
 376 #define BIFROST_FMA_OP_LSHIFT_RSUB_32  (0x65a00 >> 6)
 377 #define BIFROST_FMA_OP_RSHIFT_ADD_32   (0x65e00 >> 6)
 378 #define BIFROST_FMA_OP_RSHIFT_SUB_32   (0x66200 >> 6)
 379 #define BIFROST_FMA_OP_RSHIFT_RSUB_32  (0x66600 >> 6)
 380
 381 struct bifrost_shift_fma {
 382         unsigned src0 : 3;
 383         unsigned src1 : 3;
 384         unsigned src2 : 3;
 385         unsigned half : 3;
 386         unsigned unk  : 1; /* always set? */
 387         unsigned invert_1 : 1; /* Inverts sources to combining op */
 388         /* For XOR, switches RSHIFT to LSHIFT since only one invert needed */
 389         unsigned invert_2 : 1;
 390         unsigned op : 8;
 391 } __attribute__((packed));
 392
 393 struct bifrost_shift_add {
 394         unsigned src0 : 3;
 395         unsigned src1 : 3;
 396         unsigned src2 : 3;
 397         unsigned zero : 2;
 398
 399         unsigned invert_1 : 1;
 400         unsigned invert_2 : 1;
 401
 402         unsigned op : 7;
 403 } __attribute__((packed));
 404
 405 enum bifrost_fcmp_cond {
 406         BIFROST_OEQ = 0,
 407         BIFROST_OGT = 1,
 408         BIFROST_OGE = 2,
 409         BIFROST_UNE = 3,
 410         BIFROST_OLT = 4,
 411         BIFROST_OLE = 5,
 412 };
 413
 414 #define BIFROST_FMA_OP_FCMP_GL (0x48000 >> 13)
 415 #define BIFROST_FMA_OP_FCMP_D3D (0x4c000 >> 13)
 416
 417 struct bifrost_fma_fcmp {
 418         unsigned src0 : 3;
 419         unsigned src1 : 3;
 420         unsigned src1_abs : 1;
 421         unsigned unk1 : 1;
 422         unsigned src1_neg : 1;
 423         unsigned src_expand : 3;
 424         unsigned src0_abs : 1;
 425         enum bifrost_fcmp_cond cond : 3;
 426         unsigned op   : 7;
 427 } __attribute__((packed));
 428
 429 struct bifrost_add_fcmp {
 430         unsigned src0 : 3;
 431         unsigned src1 : 3;
 432         enum bifrost_fcmp_cond cond : 3;
 433         unsigned src_expand : 2;
 434         unsigned src0_abs : 1;
 435         unsigned src1_abs : 1;
 436         unsigned src1_neg : 1;
 437         unsigned op   : 6;
 438 } __attribute__((packed));
 439
 440 #define BIFROST_FMA_OP_FCMP_GL_16 (0xc8000 >> 13)
 441 #define BIFROST_FMA_OP_FCMP_D3D_16 (0xcc000 >> 13)
 442
 443 struct bifrost_fma_fcmp16 {
 444         unsigned src0 : 3;
 445         unsigned src1 : 3;
 446
 447         /* abs2 inferred */
 448         unsigned abs1 : 1;
 449         unsigned unk : 2;
 450
 451         unsigned src0_swizzle : 2;
 452         unsigned src1_swizzle : 2;
 453
 454         enum bifrost_fcmp_cond cond : 3;
 455         unsigned op   : 7;
 456 } __attribute__((packed));
 457
 458 struct bifrost_add_fcmp16 {
 459         unsigned src0 : 3;
 460         unsigned src1 : 3;
 461         enum bifrost_fcmp_cond cond : 3;
 462
 463         unsigned src0_swizzle : 2;
 464         unsigned src1_swizzle : 2;
 465
 466         /* No abs mods */
 467         unsigned src0_neg : 1;
 468
 469         unsigned op   : 6;
 470 } __attribute__((packed));
 471
 472 enum bifrost_icmp_cond {
 473         BIFROST_ICMP_IGT = 0,
 474         BIFROST_ICMP_IGE = 1,
 475         BIFROST_ICMP_UGT = 2,
 476         BIFROST_ICMP_UGE = 3,
 477         BIFROST_ICMP_EQ  = 4,
 478         BIFROST_ICMP_NEQ  = 5,
 479 };
 480
 481 struct bifrost_fma_icmp32 {
 482         unsigned src0 : 3;
 483         unsigned src1 : 3;
 484         enum bifrost_icmp_cond cond : 3;
 485         unsigned unk1 : 1; /* set */
 486         unsigned d3d : 1;
 487         unsigned op : 12;
 488 } __attribute__((packed));
 489
 490 struct bifrost_fma_icmp16 {
 491         unsigned src0 : 3;
 492         unsigned src1 : 3;
 493         unsigned unk : 5; /* 11010 */
 494         enum bifrost_icmp_cond cond : 3;
 495         unsigned op : 9;
 496 } __attribute__((packed));
 497
 498 struct bifrost_add_icmp {
 499         unsigned src0 : 3;
 500         unsigned src1 : 3;
 501         enum bifrost_icmp_cond cond : 3;
 502         unsigned sz : 1; /* 1 for 32, 0 for 8 */
 503         unsigned d3d : 1;
 504         unsigned op : 9;
 505 } __attribute__((packed));
 506
 507 /* Two sources for vectorization */
 508 #define BIFROST_FMA_FLOAT32_TO_16 (0xdd000 >> 3)
 509 #define BIFROST_ADD_FLOAT32_TO_16 (0x0EC00 >> 3)
 510
 511 enum bifrost_convert_mode {
 512         BIFROST_CONV_UNK0 = 0,
 513         BIFROST_CONV_F32_TO_I32 = 1,
 514         BIFROST_CONV_F16_TO_I16 = 2,
 515         BIFROST_CONV_I32_TO_F32 = 3,
 516         BIFROST_CONV_I16_TO_X32 = 4,
 517         BIFROST_CONV_F16_TO_F32 = 5,
 518         BIFROST_CONV_I16_TO_F16 = 6,
 519         BIFROST_CONV_UNK7 = 7
 520 };
 521
 522 /* i16 to x32 */
 523 #define BIFROST_CONVERT_4(is_unsigned, component, to_float) \
 524         ((is_unsigned & 1) | ((component & 1) << 1) | ((to_float & 1) << 2) | \
 525          ((0x3) << 3) | ((4) << 5) | 0x100)
 526
 527 /* f16 to f32 */
 528 #define BIFROST_CONVERT_5(component) \
 529         ((component & 1) | ((1) << 1) | ((5) << 5) | 0x100)
 530
 531 /* Other conversions */
 532 #define BIFROST_CONVERT(is_unsigned, roundmode, swizzle, mode) \
 533         ((is_unsigned & 1) | ((roundmode & 3) << 1) | ((swizzle & 3) << 3) | ((mode & 7) << 5))
 534
 535 #define BIFROST_FMA_CONVERT (0xe0000)
 536 #define BIFROST_ADD_CONVERT (0x07800)
 537
 538 enum bifrost_ldst_type {
 539         BIFROST_LDST_F16 = 0,
 540         BIFROST_LDST_F32 = 1,
 541         BIFROST_LDST_I32 = 2,
 542         BIFROST_LDST_U32 = 3
 543 };
 544
 545 #define BIFROST_ADD_OP_LD_VAR_ADDR (0x18000 >> 10)
 546
 547 struct bifrost_ld_var_addr {
 548         unsigned src0 : 3;
 549         unsigned src1 : 3;
 550         unsigned location : 5;
 551         enum bifrost_ldst_type type : 2;
 552         unsigned op : 7;
 553 } __attribute__((packed));
 554
 555 #define BIFROST_ADD_OP_LD_ATTR (0x08000 >> 12)
 556
 557 struct bifrost_ld_attr {
 558         unsigned src0 : 3;
 559         unsigned src1 : 3;
 560         unsigned location : 5;
 561         unsigned channels : 2; /* MALI_POSITIVE */
 562         enum bifrost_ldst_type type : 2;
 563         unsigned op : 5;
 564 } __attribute__((packed));
 565
 566 enum bifrost_interp_mode {
 567         BIFROST_INTERP_PER_FRAG = 0x0,
 568         BIFROST_INTERP_CENTROID = 0x1,
 569         BIFROST_INTERP_DEFAULT  = 0x2,
 570         BIFROST_INTERP_EXPLICIT = 0x3
 571 };
 572
 573 #define BIFROST_ADD_OP_LD_VAR_16 (0x1a << 1)
 574 #define BIFROST_ADD_OP_LD_VAR_32 (0x0a << 1)
 575
 576 struct bifrost_ld_var {
 577         unsigned src0 : 3;
 578
 579         /* If top two bits set, indirect with src in bottom three */
 580         unsigned addr : 5;
 581
 582         unsigned channels : 2; /* MALI_POSITIVE */
 583         enum bifrost_interp_mode interp_mode : 2;
 584         unsigned reuse : 1;
 585         unsigned flat : 1;
 586         unsigned op : 6;
 587 } __attribute__((packed));
 588
 589 struct bifrost_tex_ctrl {
 590         unsigned sampler_index : 4; // also used to signal indirects
 591         unsigned tex_index : 7;
 592         bool no_merge_index : 1; // whether to merge (direct) sampler & texture indices
 593         bool filter : 1; // use the usual filtering pipeline (0 for texelFetch & textureGather)
 594         unsigned unk0 : 2;
 595         bool texel_offset : 1; // *Offset()
 596         bool is_shadow : 1;
 597         bool is_array : 1;
 598         unsigned tex_type : 2; // 2D, 3D, Cube, Buffer
 599         bool compute_lod : 1; // 0 for *Lod()
 600         bool not_supply_lod : 1; // 0 for *Lod() or when a bias is applied
 601         bool calc_gradients : 1; // 0 for *Grad()
 602         unsigned unk1 : 1;
 603         unsigned result_type : 4; // integer, unsigned, float TODO: why is this 4 bits?
 604         unsigned unk2 : 4;
 605 } __attribute__((packed));
 606
 607 struct bifrost_dual_tex_ctrl {
 608         unsigned sampler_index0 : 2;
 609         unsigned unk0 : 2;
 610         unsigned tex_index0 : 2;
 611         unsigned sampler_index1 : 2;
 612         unsigned tex_index1 : 2;
 613         unsigned unk1 : 22;
 614 } __attribute__((packed));
 615
 616 #define BIFROST_ADD_OP_TEX_COMPACT_F32 (0x0b000 >> 10)
 617 #define BIFROST_ADD_OP_TEX_COMPACT_F16 (0x1b000 >> 10)
 618
 619 struct bifrost_tex_compact {
 620         unsigned src0 : 3;
 621         unsigned src1 : 3;
 622         unsigned tex_index : 3;
 623         unsigned unknown : 1;
 624         unsigned sampler_index : 3;
 625         unsigned op   : 7;
 626 } __attribute__((packed));
 627
 628 enum branch_bit_size {
 629         BR_SIZE_32 = 0,
 630         BR_SIZE_16XX = 1,
 631         BR_SIZE_16YY = 2,
 632         // For the above combinations of bitsize and location, an extra bit is
 633         // encoded via comparing the sources. The only possible source of ambiguity
 634         // would be if the sources were the same, but then the branch condition
 635         // would be always true or always false anyways, so we can ignore it. But
 636         // this no longer works when comparing the y component to the x component,
 637         // since it's valid to compare the y component of a source against its own
 638         // x component. Instead, the extra bit is encoded via an extra bitsize.
 639         BR_SIZE_16YX0 = 3,
 640         BR_SIZE_16YX1 = 4,
 641         BR_SIZE_32_AND_16X = 5,
 642         BR_SIZE_32_AND_16Y = 6,
 643         // Used for comparisons with zero and always-true, see below. I think this
 644         // only works for integer comparisons.
 645         BR_SIZE_ZERO = 7,
 646 };
 647
 648 enum bifrost_reg_write_unit {
 649         REG_WRITE_NONE = 0, // don't write
 650         REG_WRITE_TWO, // write using reg2
 651         REG_WRITE_THREE, // write using reg3
 652 };
 653
 654 struct bifrost_regs {
 655         unsigned uniform_const : 8;
 656         unsigned reg2 : 6;
 657         unsigned reg3 : 6;
 658         unsigned reg0 : 5;
 659         unsigned reg1 : 6;
 660         unsigned ctrl : 4;
 661 } __attribute__((packed));
 662
 663 enum bifrost_branch_cond {
 664         BR_COND_LT = 0,
 665         BR_COND_LE = 1,
 666         BR_COND_GE = 2,
 667         BR_COND_GT = 3,
 668         // Equal vs. not-equal determined by src0/src1 comparison
 669         BR_COND_EQ = 4,
 670         // floating-point comparisons
 671         // Becomes UNE when you flip the arguments
 672         BR_COND_OEQ = 5,
 673         // TODO what happens when you flip the arguments?
 674         BR_COND_OGT = 6,
 675         BR_COND_OLT = 7,
 676 };
 677
 678 enum bifrost_branch_code {
 679         BR_ALWAYS = 63,
 680 };
 681
 682 struct bifrost_branch {
 683         unsigned src0 : 3;
 684
 685         /* For BR_SIZE_ZERO, upper two bits become ctrl */
 686         unsigned src1 : 3;
 687
 688         /* Offset source -- always uniform/const but
 689          * theoretically could support indirect jumps? */
 690         unsigned src2 : 3;
 691
 692         enum bifrost_branch_cond cond : 3;
 693         enum branch_bit_size size : 3;
 694
 695         unsigned op : 5;
 696 };
 697
 698 /* Clause packing */
 699
 700 #define BIFROST_FMA_NOP (0x701960 | BIFROST_SRC_STAGE)
 701 #define BIFROST_ADD_NOP (0x3D960 | BIFROST_SRC_STAGE)
 702
 703 struct bifrost_fmt1 {
 704         unsigned ins_0 : 3;
 705         unsigned tag : 5;
 706         uint64_t ins_1 : 64;
 707         unsigned ins_2 : 11;
 708         uint64_t header : 45;
 709 } __attribute__((packed));
 710
 711 #define BIFROST_FMT1_INSTRUCTIONS    0b00101
 712 #define BIFROST_FMT1_FINAL           0b01001
 713 #define BIFROST_FMT1_CONSTANTS       0b00001
 714
 715 #define BIFROST_FMTC_CONSTANTS       0b0011
 716 #define BIFROST_FMTC_FINAL           0b0111
 717
 718 struct bifrost_fmt_constant {
 719         unsigned pos : 4;
 720         unsigned tag : 4;
 721         uint64_t imm_1 : 60;
 722         uint64_t imm_2 : 60;
 723 } __attribute__((packed));
 724
 725 enum bifrost_reg_control {
 726         BIFROST_WRITE_FMA_P2         = 1,
 727         BIFROST_WRITE_FMA_P2_READ_P3 = 2,
 728         BIFROST_FIRST_WRITE_FMA_P2_READ_P3 = 3,
 729         BIFROST_READ_P3              = 4,
 730         BIFROST_WRITE_ADD_P2         = 5,
 731         BIFROST_WRITE_ADD_P2_READ_P3 = 6,
 732         BIFROST_WRITE_ADD_P2_FMA_P3  = 7,
 733
 734         BIFROST_FIRST_NONE           = 8,
 735         BIFROST_FIRST_WRITE_FMA_P2   = 9,
 736         /* INSTR_INVALID_ENC */
 737         BIFROST_REG_NONE             = 11,
 738         BIFROST_FIRST_READ_P3        = 12,
 739         BIFROST_FIRST_WRITE_ADD_P2   = 13,
 740         BIFROST_FIRST_WRITE_ADD_P2_READ_P3 = 14,
 741         BIFROST_FIRST_WRITE_ADD_P2_FMA_P3  = 15
 742 };
 743
 744 #endif