src/panfrost/midgard/midgard.h

   1 /* Author(s):
   2  *   Connor Abbott
   3  *   Alyssa Rosenzweig
   4  *
   5  * Copyright (c) 2013 Connor Abbott (connor@abbott.cx)
   6  * Copyright (c) 2018 Alyssa Rosenzweig (alyssa@rosenzweig.io)
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  */
  26
  27 #ifndef __midgard_h__
  28 #define __midgard_h__
  29
  30 #include <stdint.h>
  31 #include <stdbool.h>
  32
  33 #define MIDGARD_DBG_MSGS                0x0001
  34 #define MIDGARD_DBG_SHADERS             0x0002
  35 #define MIDGARD_DBG_SHADERDB            0x0004
  36
  37 extern int midgard_debug;
  38
  39 typedef enum {
  40         midgard_word_type_alu,
  41         midgard_word_type_load_store,
  42         midgard_word_type_texture,
  43         midgard_word_type_unknown
  44 } midgard_word_type;
  45
  46 typedef enum {
  47         midgard_alu_vmul,
  48         midgard_alu_sadd,
  49         midgard_alu_smul,
  50         midgard_alu_vadd,
  51         midgard_alu_lut
  52 } midgard_alu;
  53
  54 enum {
  55         TAG_INVALID = 0x0,
  56         TAG_BREAK = 0x1,
  57         TAG_TEXTURE_4_VTX = 0x2,
  58         TAG_TEXTURE_4 = 0x3,
  59         TAG_TEXTURE_4_BARRIER = 0x4,
  60         TAG_LOAD_STORE_4 = 0x5,
  61         TAG_UNKNOWN_1 = 0x6,
  62         TAG_UNKNOWN_2 = 0x7,
  63         TAG_ALU_4 = 0x8,
  64         TAG_ALU_8 = 0x9,
  65         TAG_ALU_12 = 0xA,
  66         TAG_ALU_16 = 0xB,
  67         TAG_ALU_4_WRITEOUT = 0xC,
  68         TAG_ALU_8_WRITEOUT = 0xD,
  69         TAG_ALU_12_WRITEOUT = 0xE,
  70         TAG_ALU_16_WRITEOUT = 0xF
  71 };
  72
  73 /*
  74  * ALU words
  75  */
  76
  77 typedef enum {
  78         midgard_alu_op_fadd       = 0x10,
  79         midgard_alu_op_fmul       = 0x14,
  80
  81         midgard_alu_op_fmin       = 0x28,
  82         midgard_alu_op_fmax       = 0x2C,
  83
  84         midgard_alu_op_fmov       = 0x30, /* fmov_rte */
  85         midgard_alu_op_fmov_rtz   = 0x31,
  86         midgard_alu_op_fmov_rtn   = 0x32,
  87         midgard_alu_op_fmov_rtp   = 0x33,
  88         midgard_alu_op_froundeven = 0x34,
  89         midgard_alu_op_ftrunc     = 0x35,
  90         midgard_alu_op_ffloor     = 0x36,
  91         midgard_alu_op_fceil      = 0x37,
  92         midgard_alu_op_ffma       = 0x38,
  93         midgard_alu_op_fdot3      = 0x3C,
  94         midgard_alu_op_fdot3r     = 0x3D,
  95         midgard_alu_op_fdot4      = 0x3E,
  96         midgard_alu_op_freduce    = 0x3F,
  97
  98         midgard_alu_op_iadd       = 0x40,
  99         midgard_alu_op_ishladd    = 0x41, /* a + (b<<1) */
 100         midgard_alu_op_isub       = 0x46,
 101         midgard_alu_op_iaddsat    = 0x48,
 102         midgard_alu_op_uaddsat    = 0x49,
 103         midgard_alu_op_isubsat    = 0x4E,
 104         midgard_alu_op_usubsat    = 0x4F,
 105
 106         midgard_alu_op_imul       = 0x58,
 107
 108         midgard_alu_op_imin       = 0x60,
 109         midgard_alu_op_umin       = 0x61,
 110         midgard_alu_op_imax       = 0x62,
 111         midgard_alu_op_umax       = 0x63,
 112         midgard_alu_op_ihadd      = 0x64,
 113         midgard_alu_op_uhadd      = 0x65,
 114         midgard_alu_op_irhadd     = 0x66,
 115         midgard_alu_op_urhadd     = 0x67,
 116         midgard_alu_op_iasr       = 0x68,
 117         midgard_alu_op_ilsr       = 0x69,
 118         midgard_alu_op_ishl       = 0x6E,
 119
 120         midgard_alu_op_iand       = 0x70,
 121         midgard_alu_op_ior        = 0x71,
 122         midgard_alu_op_inand      = 0x72, /* ~(a & b), for inot let a = b */
 123         midgard_alu_op_inor       = 0x73, /* ~(a | b) */
 124         midgard_alu_op_iandnot    = 0x74, /* (a & ~b), used for not/b2f */
 125         midgard_alu_op_iornot     = 0x75, /* (a | ~b) */
 126         midgard_alu_op_ixor       = 0x76,
 127         midgard_alu_op_inxor      = 0x77, /* ~(a & b) */
 128         midgard_alu_op_iclz       = 0x78, /* Number of zeroes on left */
 129         midgard_alu_op_ibitcount8 = 0x7A, /* Counts bits in 8-bit increments */
 130         midgard_alu_op_imov       = 0x7B,
 131         midgard_alu_op_iabsdiff   = 0x7C,
 132         midgard_alu_op_uabsdiff   = 0x7D,
 133         midgard_alu_op_ichoose    = 0x7E, /* vector, component number - dupe for shuffle() */
 134
 135         midgard_alu_op_feq        = 0x80,
 136         midgard_alu_op_fne        = 0x81,
 137         midgard_alu_op_flt        = 0x82,
 138         midgard_alu_op_fle        = 0x83,
 139         midgard_alu_op_fball_eq   = 0x88,
 140         midgard_alu_op_fball_neq  = 0x89,
 141         midgard_alu_op_fball_lt   = 0x8A, /* all(lessThan(.., ..)) */
 142         midgard_alu_op_fball_lte  = 0x8B, /* all(lessThanEqual(.., ..)) */
 143
 144         midgard_alu_op_fbany_eq   = 0x90,
 145         midgard_alu_op_fbany_neq  = 0x91,
 146         midgard_alu_op_fbany_lt   = 0x92, /* any(lessThan(.., ..)) */
 147         midgard_alu_op_fbany_lte  = 0x93, /* any(lessThanEqual(.., ..)) */
 148
 149         midgard_alu_op_f2i_rte    = 0x98,
 150         midgard_alu_op_f2i_rtz    = 0x99,
 151         midgard_alu_op_f2i_rtn    = 0x9A,
 152         midgard_alu_op_f2i_rtp    = 0x9B,
 153         midgard_alu_op_f2u_rte    = 0x9C,
 154         midgard_alu_op_f2u_rtz    = 0x9D,
 155         midgard_alu_op_f2u_rtn    = 0x9E,
 156         midgard_alu_op_f2u_rtp    = 0x9F,
 157
 158         midgard_alu_op_ieq        = 0xA0,
 159         midgard_alu_op_ine        = 0xA1,
 160         midgard_alu_op_ult        = 0xA2,
 161         midgard_alu_op_ule        = 0xA3,
 162         midgard_alu_op_ilt        = 0xA4,
 163         midgard_alu_op_ile        = 0xA5,
 164         midgard_alu_op_iball_eq   = 0xA8,
 165         midgard_alu_op_iball_neq  = 0xA9,
 166         midgard_alu_op_uball_lt   = 0xAA,
 167         midgard_alu_op_uball_lte  = 0xAB,
 168         midgard_alu_op_iball_lt   = 0xAC,
 169         midgard_alu_op_iball_lte  = 0xAD,
 170
 171         midgard_alu_op_ibany_eq   = 0xB0,
 172         midgard_alu_op_ibany_neq  = 0xB1,
 173         midgard_alu_op_ubany_lt   = 0xB2,
 174         midgard_alu_op_ubany_lte  = 0xB3,
 175         midgard_alu_op_ibany_lt   = 0xB4, /* any(lessThan(.., ..)) */
 176         midgard_alu_op_ibany_lte  = 0xB5, /* any(lessThanEqual(.., ..)) */
 177         midgard_alu_op_i2f_rte    = 0xB8,
 178         midgard_alu_op_i2f_rtz    = 0xB9,
 179         midgard_alu_op_i2f_rtn    = 0xBA,
 180         midgard_alu_op_i2f_rtp    = 0xBB,
 181         midgard_alu_op_u2f_rte    = 0xBC,
 182         midgard_alu_op_u2f_rtz    = 0xBD,
 183         midgard_alu_op_u2f_rtn    = 0xBE,
 184         midgard_alu_op_u2f_rtp    = 0xBF,
 185
 186         midgard_alu_op_icsel_v    = 0xC0, /* condition code r31 */
 187         midgard_alu_op_icsel      = 0xC1, /* condition code r31.w */
 188         midgard_alu_op_fcsel_v    = 0xC4,
 189         midgard_alu_op_fcsel      = 0xC5,
 190         midgard_alu_op_fround     = 0xC6,
 191
 192         midgard_alu_op_fatan_pt2  = 0xE8,
 193         midgard_alu_op_fpow_pt1   = 0xEC,
 194         midgard_alu_op_fpown_pt1  = 0xED,
 195         midgard_alu_op_fpowr_pt1  = 0xEE,
 196
 197         midgard_alu_op_frcp       = 0xF0,
 198         midgard_alu_op_frsqrt     = 0xF2,
 199         midgard_alu_op_fsqrt      = 0xF3,
 200         midgard_alu_op_fexp2      = 0xF4,
 201         midgard_alu_op_flog2      = 0xF5,
 202         midgard_alu_op_fsin       = 0xF6,
 203         midgard_alu_op_fcos       = 0xF7,
 204         midgard_alu_op_fatan2_pt1 = 0xF9,
 205 } midgard_alu_op;
 206
 207 typedef enum {
 208         midgard_outmod_none = 0,
 209         midgard_outmod_pos  = 1, /* max(x, 0.0) */
 210         midgard_outmod_sat_signed  = 2, /* clamp(x, -1.0, 1.0) */
 211         midgard_outmod_sat  = 3 /* clamp(x, 0.0, 1.0) */
 212 } midgard_outmod_float;
 213
 214 typedef enum {
 215         midgard_outmod_int_saturate = 0,
 216         midgard_outmod_uint_saturate = 1,
 217         midgard_outmod_int_wrap = 2,
 218         midgard_outmod_int_high = 3, /* Overflowed portion */
 219 } midgard_outmod_int;
 220
 221 typedef enum {
 222         midgard_reg_mode_8 = 0,
 223         midgard_reg_mode_16 = 1,
 224         midgard_reg_mode_32 = 2,
 225         midgard_reg_mode_64 = 3
 226 } midgard_reg_mode;
 227
 228 typedef enum {
 229         midgard_dest_override_lower = 0,
 230         midgard_dest_override_upper = 1,
 231         midgard_dest_override_none = 2
 232 } midgard_dest_override;
 233
 234 typedef enum {
 235         midgard_int_sign_extend = 0,
 236         midgard_int_zero_extend = 1,
 237         midgard_int_normal = 2,
 238         midgard_int_shift = 3
 239 } midgard_int_mod;
 240
 241 #define MIDGARD_FLOAT_MOD_ABS (1 << 0)
 242 #define MIDGARD_FLOAT_MOD_NEG (1 << 1)
 243
 244 typedef struct
 245 __attribute__((__packed__))
 246 {
 247         /* Either midgard_int_mod or from midgard_float_mod_*, depending on the
 248          * type of op */
 249         unsigned mod : 2;
 250
 251         /* replicate lower half if dest = half, or low/high half selection if
 252          * dest = full
 253          */
 254         bool rep_low     : 1;
 255         bool rep_high    : 1; /* unused if dest = full */
 256         bool half        : 1; /* only matters if dest = full */
 257         unsigned swizzle : 8;
 258 }
 259 midgard_vector_alu_src;
 260
 261 typedef struct
 262 __attribute__((__packed__))
 263 {
 264         midgard_alu_op op               :  8;
 265         midgard_reg_mode reg_mode   :  2;
 266         unsigned src1 : 13;
 267         unsigned src2 : 13;
 268         midgard_dest_override dest_override : 2;
 269         unsigned outmod               : 2;
 270         unsigned mask                           : 8;
 271 }
 272 midgard_vector_alu;
 273
 274 typedef struct
 275 __attribute__((__packed__))
 276 {
 277         unsigned mod       : 2;
 278         bool full          : 1; /* 0 = half, 1 = full */
 279         unsigned component : 3;
 280 }
 281 midgard_scalar_alu_src;
 282
 283 typedef struct
 284 __attribute__((__packed__))
 285 {
 286         midgard_alu_op op         :  8;
 287         unsigned src1             :  6;
 288         unsigned src2             : 11;
 289         unsigned unknown          :  1;
 290         unsigned outmod :  2;
 291         bool output_full          :  1;
 292         unsigned output_component :  3;
 293 }
 294 midgard_scalar_alu;
 295
 296 typedef struct
 297 __attribute__((__packed__))
 298 {
 299         unsigned src1_reg : 5;
 300         unsigned src2_reg : 5;
 301         unsigned out_reg  : 5;
 302         bool src2_imm     : 1;
 303 }
 304 midgard_reg_info;
 305
 306 /* In addition to conditional branches and jumps (unconditional branches),
 307  * Midgard implements a bit of fixed function functionality used in fragment
 308  * shaders via specially crafted branches. These have special branch opcodes,
 309  * which perform a fixed-function operation and/or use the results of a
 310  * fixed-function operation as the branch condition.  */
 311
 312 typedef enum {
 313         /* Regular branches */
 314         midgard_jmp_writeout_op_branch_uncond = 1,
 315         midgard_jmp_writeout_op_branch_cond = 2,
 316
 317         /* In a fragment shader, execute a discard_if instruction, with the
 318          * corresponding condition code. Terminates the shader, so generally
 319          * set the branch target to out of the shader */
 320         midgard_jmp_writeout_op_discard = 4,
 321
 322         /* Branch if the tilebuffer is not yet ready. At the beginning of a
 323          * fragment shader that reads from the tile buffer, for instance via
 324          * ARM_shader_framebuffer_fetch or EXT_pixel_local_storage, this branch
 325          * operation should be used as a loop. An instruction like
 326          * "br.tilebuffer.always -1" does the trick, corresponding to
 327          * "while(!is_tilebuffer_ready) */
 328         midgard_jmp_writeout_op_tilebuffer_pending = 6,
 329
 330         /* In a fragment shader, try to write out the value pushed to r0 to the
 331          * tilebuffer, subject to unknown state in r1.z and r1.w. If this
 332          * succeeds, the shader terminates. If it fails, it branches to the
 333          * specified branch target. Generally, this should be used in a loop to
 334          * itself, acting as "do { write(r0); } while(!write_successful);" */
 335         midgard_jmp_writeout_op_writeout = 7,
 336 } midgard_jmp_writeout_op;
 337
 338 typedef enum {
 339         midgard_condition_write0 = 0,
 340
 341         /* These condition codes denote a conditional branch on FALSE and on
 342          * TRUE respectively */
 343         midgard_condition_false = 1,
 344         midgard_condition_true = 2,
 345
 346         /* This condition code always branches. For a pure branch, the
 347          * unconditional branch coding should be used instead, but for
 348          * fixed-function branch opcodes, this is still useful */
 349         midgard_condition_always = 3,
 350 } midgard_condition;
 351
 352 typedef struct
 353 __attribute__((__packed__))
 354 {
 355         midgard_jmp_writeout_op op : 3; /* == branch_uncond */
 356         unsigned dest_tag : 4; /* tag of branch destination */
 357         unsigned unknown : 2;
 358         int offset : 7;
 359 }
 360 midgard_branch_uncond;
 361
 362 typedef struct
 363 __attribute__((__packed__))
 364 {
 365         midgard_jmp_writeout_op op : 3; /* == branch_cond */
 366         unsigned dest_tag : 4; /* tag of branch destination */
 367         int offset : 7;
 368         midgard_condition cond : 2;
 369 }
 370 midgard_branch_cond;
 371
 372 typedef struct
 373 __attribute__((__packed__))
 374 {
 375         midgard_jmp_writeout_op op : 3; /* == branch_cond */
 376         unsigned dest_tag : 4; /* tag of branch destination */
 377         unsigned unknown : 2;
 378         signed offset : 23;
 379
 380         /* Extended branches permit inputting up to 4 conditions loaded into
 381          * r31 (two in r31.w and two in r31.x). In the most general case, we
 382          * specify a function f(A, B, C, D) mapping 4 1-bit conditions to a
 383          * single 1-bit branch criteria. Note that the domain of f has 2^(2^4)
 384          * elements, each mapping to 1-bit of output, so we can trivially
 385          * construct a Godel numbering of f as a (2^4)=16-bit integer. This
 386          * 16-bit integer serves as a lookup table to compute f, subject to
 387          * some swaps for ordering.
 388          *
 389          * Interesting, the standard 2-bit condition codes are also a LUT with
 390          * the same format (2^1-bit), but it's usually easier to use enums. */
 391
 392         unsigned cond : 16;
 393 }
 394 midgard_branch_extended;
 395
 396 typedef struct
 397 __attribute__((__packed__))
 398 {
 399         midgard_jmp_writeout_op op : 3; /* == writeout */
 400         unsigned unknown : 13;
 401 }
 402 midgard_writeout;
 403
 404 /*
 405  * Load/store words
 406  */
 407
 408 typedef enum {
 409         midgard_op_ld_st_noop   = 0x03,
 410
 411         /* Unpack a colour from a native format to fp16 */
 412         midgard_op_unpack_colour = 0x05,
 413
 414         /* Packs a colour from fp16 to a native format */
 415         midgard_op_pack_colour   = 0x09,
 416
 417         /* Likewise packs from fp32 */
 418         midgard_op_pack_colour_32 = 0x0A,
 419
 420         /* Unclear why this is on the L/S unit, but moves fp32 cube map
 421          * coordinates in r27 to its cube map texture coordinate destination
 422          * (e.g r29). */
 423
 424         midgard_op_ld_cubemap_coords = 0x0E,
 425
 426         /* Loads a global/local/group ID, depending on arguments */
 427         midgard_op_ld_compute_id = 0x10,
 428
 429         /* The L/S unit can do perspective division a clock faster than the ALU
 430          * if you're lucky. Put the vec4 in r27, and call with 0x24 as the
 431          * unknown state; the output will be <x/w, y/w, z/w, 1>. Replace w with
 432          * z for the z version */
 433         midgard_op_ldst_perspective_division_z = 0x12,
 434         midgard_op_ldst_perspective_division_w = 0x13,
 435
 436         /* val in r27.y, address embedded, outputs result to argument. Invert val for sub. Let val = +-1 for inc/dec. */
 437         midgard_op_atomic_add = 0x40,
 438         midgard_op_atomic_add64 = 0x41,
 439
 440         midgard_op_atomic_and = 0x44,
 441         midgard_op_atomic_and64 = 0x45,
 442         midgard_op_atomic_or = 0x48,
 443         midgard_op_atomic_or64 = 0x49,
 444         midgard_op_atomic_xor = 0x4C,
 445         midgard_op_atomic_xor64 = 0x4D,
 446
 447         midgard_op_atomic_imin = 0x50,
 448         midgard_op_atomic_imin64 = 0x51,
 449         midgard_op_atomic_umin = 0x54,
 450         midgard_op_atomic_umin64 = 0x55,
 451         midgard_op_atomic_imax = 0x58,
 452         midgard_op_atomic_imax64 = 0x59,
 453         midgard_op_atomic_umax = 0x5C,
 454         midgard_op_atomic_umax64 = 0x5D,
 455
 456         midgard_op_atomic_xchg = 0x60,
 457         midgard_op_atomic_xchg64 = 0x61,
 458
 459         midgard_op_atomic_cmpxchg = 0x64,
 460         midgard_op_atomic_cmpxchg64 = 0x65,
 461
 462         /* Used for compute shader's __global arguments, __local variables (or
 463          * for register spilling) */
 464
 465         midgard_op_ld_uchar = 0x80, /* zero extends */
 466         midgard_op_ld_char = 0x81, /* sign extends */
 467         midgard_op_ld_ushort = 0x84, /* zero extends */
 468         midgard_op_ld_short = 0x85, /* sign extends */
 469         midgard_op_ld_char4 = 0x88, /* short2, int, float */
 470         midgard_op_ld_short4 = 0x8C, /* int2, float2, long */
 471         midgard_op_ld_int4 = 0x90, /* float4, long2 */
 472
 473         midgard_op_ld_attr_32 = 0x94,
 474         midgard_op_ld_attr_16 = 0x95,
 475         midgard_op_ld_attr_32u = 0x96,
 476         midgard_op_ld_attr_32i = 0x97,
 477         midgard_op_ld_vary_32 = 0x98,
 478         midgard_op_ld_vary_16 = 0x99,
 479         midgard_op_ld_vary_32u = 0x9A,
 480         midgard_op_ld_vary_32i = 0x9B,
 481
 482         /* Old version of midgard_op_ld_color_buffer_as_fp16, for T720 */
 483         midgard_op_ld_color_buffer_as_fp32_old = 0x9C,
 484         midgard_op_ld_color_buffer_as_fp16_old = 0x9D,
 485         midgard_op_ld_color_buffer_32u_old = 0x9E,
 486
 487         /* The distinction between these ops is the alignment requirement /
 488          * accompanying shift. Thus, the offset to ld_ubo_int4 is in 16-byte
 489          * units and can load 128-bit. The offset to ld_ubo_short4 is in 8-byte
 490          * units; ld_ubo_char4 in 4-byte units. ld_ubo_char/ld_ubo_char2 are
 491          * purely theoretical (never seen in the wild) since int8/int16/fp16
 492          * UBOs don't really exist. The ops are still listed to maintain
 493          * symmetry with generic I/O ops. */
 494
 495         midgard_op_ld_ubo_char   = 0xA0, /* theoretical */
 496         midgard_op_ld_ubo_char2  = 0xA4, /* theoretical */
 497         midgard_op_ld_ubo_char4  = 0xA8,
 498         midgard_op_ld_ubo_short4 = 0xAC,
 499         midgard_op_ld_ubo_int4   = 0xB0,
 500
 501         /* New-style blending ops. Works on T760/T860 */
 502         midgard_op_ld_color_buffer_as_fp32 = 0xB8,
 503         midgard_op_ld_color_buffer_as_fp16 = 0xB9,
 504         midgard_op_ld_color_buffer_32u = 0xBA,
 505
 506         midgard_op_st_char = 0xC0,
 507         midgard_op_st_char2 = 0xC4, /* short */
 508         midgard_op_st_char4 = 0xC8, /* short2, int, float */
 509         midgard_op_st_short4 = 0xCC, /* int2, float2, long */
 510         midgard_op_st_int4 = 0xD0, /* float4, long2 */
 511
 512         midgard_op_st_vary_32 = 0xD4,
 513         midgard_op_st_vary_16 = 0xD5,
 514         midgard_op_st_vary_32u = 0xD6,
 515         midgard_op_st_vary_32i = 0xD7,
 516
 517         /* Value to st in r27, location r26.w as short2 */
 518         midgard_op_st_image_f = 0xD8,
 519         midgard_op_st_image_ui = 0xDA,
 520         midgard_op_st_image_i = 0xDB,
 521 } midgard_load_store_op;
 522
 523 typedef enum {
 524         midgard_interp_sample = 0,
 525         midgard_interp_centroid = 1,
 526         midgard_interp_default = 2
 527 } midgard_interpolation;
 528
 529 typedef enum {
 530         midgard_varying_mod_none = 0,
 531
 532         /* Other values unknown */
 533
 534         /* Take the would-be result and divide all components by its z/w
 535          * (perspective division baked in with the load)  */
 536         midgard_varying_mod_perspective_z = 2,
 537         midgard_varying_mod_perspective_w = 3,
 538 } midgard_varying_modifier;
 539
 540 typedef struct
 541 __attribute__((__packed__))
 542 {
 543         unsigned zero0 : 1; /* Always zero */
 544
 545         midgard_varying_modifier modifier : 2;
 546
 547         unsigned zero1: 1; /* Always zero */
 548
 549         /* Varying qualifiers, zero if not a varying */
 550         unsigned flat    : 1;
 551         unsigned is_varying : 1; /* Always one for varying, but maybe something else? */
 552         midgard_interpolation interpolation : 2;
 553
 554         unsigned zero2 : 2; /* Always zero */
 555 }
 556 midgard_varying_parameter;
 557
 558 /* 8-bit register/etc selector for load/store ops */
 559 typedef struct
 560 __attribute__((__packed__))
 561 {
 562         /* Indexes into the register */
 563         unsigned component : 2;
 564
 565         /* Register select between r26/r27 */
 566         unsigned select : 1;
 567
 568         unsigned unknown : 2;
 569
 570         /* Like any good Arm instruction set, load/store arguments can be
 571          * implicitly left-shifted... but only the second argument. Zero for no
 572          * shifting, up to <<7 possible though. This is useful for indexing.
 573          *
 574          * For the first argument, it's unknown what these bits mean */
 575         unsigned shift : 3;
 576 }
 577 midgard_ldst_register_select;
 578
 579 typedef struct
 580 __attribute__((__packed__))
 581 {
 582         midgard_load_store_op op : 8;
 583         unsigned reg     : 5;
 584         unsigned mask    : 4;
 585         unsigned swizzle : 8;
 586
 587         /* Load/store ops can take two additional registers as arguments, but
 588          * these are limited to load/store registers with only a few supported
 589          * mask/swizzle combinations. The tradeoff is these are much more
 590          * compact, requiring 8-bits each rather than 17-bits for a full
 591          * reg/mask/swizzle. Usually (?) encoded as
 592          * midgard_ldst_register_select. */
 593         unsigned arg_1   : 8;
 594         unsigned arg_2   : 8;
 595
 596         unsigned varying_parameters : 10;
 597
 598         unsigned address : 9;
 599 }
 600 midgard_load_store_word;
 601
 602 typedef struct
 603 __attribute__((__packed__))
 604 {
 605         unsigned type      : 4;
 606         unsigned next_type : 4;
 607         uint64_t word1     : 60;
 608         uint64_t word2     : 60;
 609 }
 610 midgard_load_store;
 611
 612 /* 8-bit register selector used in texture ops to select a bias/LOD/gradient
 613  * register, shoved into the `bias` field */
 614
 615 typedef struct
 616 __attribute__((__packed__))
 617 {
 618         /* 32-bit register, clear for half-register */
 619         unsigned full : 1;
 620
 621         /* Register select between r28/r29 */
 622         unsigned select : 1;
 623
 624         /* For a half-register, selects the upper half */
 625         unsigned upper : 1;
 626
 627         /* Indexes into the register */
 628         unsigned component : 2;
 629
 630         /* Padding to make this 8-bit */
 631         unsigned zero : 3;
 632 }
 633 midgard_tex_register_select;
 634
 635 /* Texture pipeline results are in r28-r29 */
 636 #define REG_TEX_BASE 28
 637
 638 enum mali_texture_op {
 639         TEXTURE_OP_NORMAL = 1,  /* texture */
 640         TEXTURE_OP_LOD = 2,     /* textureLod */
 641         TEXTURE_OP_TEXEL_FETCH = 4,
 642         TEXTURE_OP_BARRIER = 11,
 643         TEXTURE_OP_DERIVATIVE = 13
 644 };
 645
 646 enum mali_sampler_type {
 647         MALI_SAMPLER_UNK        = 0x0,
 648         MALI_SAMPLER_FLOAT      = 0x1, /* sampler */
 649         MALI_SAMPLER_UNSIGNED   = 0x2, /* usampler */
 650         MALI_SAMPLER_SIGNED     = 0x3, /* isampler */
 651 };
 652
 653 /* Texture modes */
 654 enum mali_texture_mode {
 655         TEXTURE_NORMAL = 1,
 656         TEXTURE_SHADOW = 5,
 657         TEXTURE_GATHER_SHADOW = 6,
 658         TEXTURE_GATHER_X = 8,
 659         TEXTURE_GATHER_Y = 9,
 660         TEXTURE_GATHER_Z = 10,
 661         TEXTURE_GATHER_W = 11,
 662 };
 663
 664 enum mali_derivative_mode {
 665         TEXTURE_DFDX = 0,
 666         TEXTURE_DFDY = 1,
 667 };
 668
 669 typedef struct
 670 __attribute__((__packed__))
 671 {
 672         unsigned type      : 4;
 673         unsigned next_type : 4;
 674
 675         enum mali_texture_op op  : 4;
 676         unsigned mode : 4;
 677
 678         /* A little obscure, but last is set for the last texture operation in
 679          * a shader. cont appears to just be last's opposite (?). Yeah, I know,
 680          * kind of funky.. BiOpen thinks it could do with memory hinting, or
 681          * tile locking? */
 682
 683         unsigned cont  : 1;
 684         unsigned last  : 1;
 685
 686         unsigned format : 2;
 687
 688         /* Are sampler_handle/texture_handler respectively set by registers? If
 689          * true, the lower 8-bits of the respective field is a register word.
 690          * If false, they are an immediate */
 691
 692         unsigned sampler_register : 1;
 693         unsigned texture_register : 1;
 694
 695         /* Is a register used to specify the
 696          * LOD/bias/offset? If set, use the `bias` field as
 697          * a register index. If clear, use the `bias` field
 698          * as an immediate. */
 699         unsigned lod_register : 1;
 700
 701         /* Is a register used to specify an offset? If set, use the
 702          * offset_reg_* fields to encode this, duplicated for each of the
 703          * components. If clear, there is implcitly always an immediate offst
 704          * specificed in offset_imm_* */
 705         unsigned offset_register : 1;
 706
 707         unsigned in_reg_full  : 1;
 708         unsigned in_reg_select : 1;
 709         unsigned in_reg_upper  : 1;
 710         unsigned in_reg_swizzle : 8;
 711
 712         unsigned unknown8  : 2;
 713
 714         unsigned out_full  : 1;
 715
 716         enum mali_sampler_type sampler_type : 2;
 717
 718         unsigned out_reg_select : 1;
 719         unsigned out_upper : 1;
 720
 721         unsigned mask : 4;
 722
 723         /* Intriguingly, textures can take an outmod just like alu ops. Int
 724          * outmods are not supported as far as I can tell, so this is only
 725          * meaningful for float samplers */
 726         midgard_outmod_float outmod  : 2;
 727
 728         unsigned swizzle  : 8;
 729
 730          /* These indicate how many bundles after this texture op may be
 731           * executed in parallel with this op. We may execute only ALU and
 732          * ld/st in parallel (not other textures), and obviously there cannot
 733          * be any dependency (the blob appears to forbid even accessing other
 734          * channels of a given texture register). */
 735
 736         unsigned out_of_order   : 2;
 737         unsigned unknown4  : 10;
 738
 739         /* In immediate mode, each offset field is an immediate range [0, 7].
 740          *
 741          * In register mode, offset_x becomes a register (full, select, upper)
 742          * triplet followed by a vec3 swizzle is splattered across
 743          * offset_y/offset_z in a genuinely bizarre way.
 744          *
 745          * For texel fetches in immediate mode, the range is the full [-8, 7],
 746          * but for normal texturing the top bit must be zero and a register
 747          * used instead. It's not clear where this limitation is from.
 748          *
 749          * union {
 750          *      struct {
 751          *              signed offset_x  : 4;
 752          *              signed offset_y  : 4;
 753          *              signed offset_z  : 4;
 754          *      } immediate;
 755          *      struct {
 756          *              bool full        : 1;
 757          *              bool select      : 1;
 758          *              bool upper       : 1;
 759          *              unsigned swizzle : 8;
 760          *              unsigned zero    : 1;
 761          *      } register;
 762          * }
 763          */
 764
 765         unsigned offset : 12;
 766
 767         /* In immediate bias mode, for a normal texture op, this is
 768          * texture bias, computed as int(2^8 * frac(biasf)), with
 769          * bias_int = floor(bias). For a textureLod, it's that, but
 770          * s/bias/lod. For a texel fetch, this is the LOD as-is.
 771          *
 772          * In register mode, this is a midgard_tex_register_select
 773          * structure and bias_int is zero */
 774
 775         unsigned bias : 8;
 776         signed bias_int  : 8;
 777
 778         /* If sampler/texture_register is set, the bottom 8-bits are
 779          * midgard_tex_register_select and the top 8-bits are zero. If they are
 780          * clear, they are immediate texture indices */
 781
 782         unsigned sampler_handle : 16;
 783         unsigned texture_handle : 16;
 784 }
 785 midgard_texture_word;
 786
 787 /* Technically barriers are texture instructions but it's less work to add them
 788  * as an explicitly zeroed special case, since most fields are forced to go to
 789  * zero */
 790
 791 typedef struct
 792 __attribute__((__packed__))
 793 {
 794         unsigned type      : 4;
 795         unsigned next_type : 4;
 796
 797         /* op = TEXTURE_OP_BARRIER */
 798         unsigned op  : 6;
 799         unsigned zero1    : 2;
 800
 801         /* Since helper invocations don't make any sense, these are forced to one */
 802         unsigned cont  : 1;
 803         unsigned last  : 1;
 804         unsigned zero2 : 14;
 805
 806         unsigned zero3 : 24;
 807         unsigned out_of_order : 4;
 808         unsigned zero4 : 4;
 809
 810         uint64_t zero5;
 811 } midgard_texture_barrier_word;
 812
 813 typedef union midgard_constants {
 814         double f64[2];
 815         uint64_t u64[2];
 816         int64_t i64[2];
 817         float f32[4];
 818         uint32_t u32[4];
 819         int32_t i32[4];
 820         uint16_t f16[8];
 821         uint16_t u16[8];
 822         int16_t i16[8];
 823         uint8_t u8[16];
 824         int8_t i8[16];
 825 }
 826 midgard_constants;
 827
 828 enum midgard_roundmode {
 829         MIDGARD_RTE = 0x0, /* round to even */
 830         MIDGARD_RTZ = 0x1, /* round to zero */
 831         MIDGARD_RTN = 0x2, /* round to negative */
 832         MIDGARD_RTP = 0x3, /* round to positive */
 833 };
 834
 835 #endif