amd_kernel_code_t.h

/*
 * Copyright 2015,2016 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, and/or sell copies of the Software, and to permit persons to whom
 * the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#ifndef AMDKERNELCODET_H
#define AMDKERNELCODET_H

//---------------------------------------------------------------------------//
// AMD Kernel Code, and its dependencies                                     //
//---------------------------------------------------------------------------//

// Sets val bits for specified mask in specified dst packed instance.
#define AMD_HSA_BITS_SET(dst, mask, val)                                                           \
   dst &= (~(1 << mask##_SHIFT) & ~mask);                                                          \
   dst |= (((val) << mask##_SHIFT) & mask)

// Gets bits for specified mask from specified src packed instance.
#define AMD_HSA_BITS_GET(src, mask) ((src & mask) >> mask##_SHIFT)

/* Every amd_*_code_t has the following properties, which are composed of
 * a number of bit fields. Every bit field has a mask (AMD_CODE_PROPERTY_*),
 * bit width (AMD_CODE_PROPERTY_*_WIDTH, and bit shift amount
 * (AMD_CODE_PROPERTY_*_SHIFT) for convenient access. Unused bits must be 0.
 *
 * (Note that bit fields cannot be used as their layout is
 * implementation defined in the C standard and so cannot be used to
 * specify an ABI)
 */
enum amd_code_property_mask_t
{

   /* Enable the setup of the SGPR user data registers
    * (AMD_CODE_PROPERTY_ENABLE_SGPR_*), see documentation of amd_kernel_code_t
    * for initial register state.
    *
    * The total number of SGPRuser data registers requested must not
    * exceed 16. Any requests beyond 16 will be ignored.
    *
    * Used to set COMPUTE_PGM_RSRC2.USER_SGPR (set to total count of
    * SGPR user data registers enabled up to 16).
    */

   AMD_CODE_PROPERTY_ENABLE_SGPR_PRIVATE_SEGMENT_BUFFER_SHIFT = 0,
   AMD_CODE_PROPERTY_ENABLE_SGPR_PRIVATE_SEGMENT_BUFFER_WIDTH = 1,
   AMD_CODE_PROPERTY_ENABLE_SGPR_PRIVATE_SEGMENT_BUFFER =
      ((1 << AMD_CODE_PROPERTY_ENABLE_SGPR_PRIVATE_SEGMENT_BUFFER_WIDTH) - 1)
      << AMD_CODE_PROPERTY_ENABLE_SGPR_PRIVATE_SEGMENT_BUFFER_SHIFT,

   AMD_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_PTR_SHIFT = 1,
   AMD_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_PTR_WIDTH = 1,
   AMD_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_PTR =
      ((1 << AMD_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_PTR_WIDTH) - 1)
      << AMD_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_PTR_SHIFT,

   AMD_CODE_PROPERTY_ENABLE_SGPR_QUEUE_PTR_SHIFT = 2,
   AMD_CODE_PROPERTY_ENABLE_SGPR_QUEUE_PTR_WIDTH = 1,
   AMD_CODE_PROPERTY_ENABLE_SGPR_QUEUE_PTR =
      ((1 << AMD_CODE_PROPERTY_ENABLE_SGPR_QUEUE_PTR_WIDTH) - 1)
      << AMD_CODE_PROPERTY_ENABLE_SGPR_QUEUE_PTR_SHIFT,

   AMD_CODE_PROPERTY_ENABLE_SGPR_KERNARG_SEGMENT_PTR_SHIFT = 3,
   AMD_CODE_PROPERTY_ENABLE_SGPR_KERNARG_SEGMENT_PTR_WIDTH = 1,
   AMD_CODE_PROPERTY_ENABLE_SGPR_KERNARG_SEGMENT_PTR =
      ((1 << AMD_CODE_PROPERTY_ENABLE_SGPR_KERNARG_SEGMENT_PTR_WIDTH) - 1)
      << AMD_CODE_PROPERTY_ENABLE_SGPR_KERNARG_SEGMENT_PTR_SHIFT,

   AMD_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_ID_SHIFT = 4,
   AMD_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_ID_WIDTH = 1,
   AMD_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_ID =
      ((1 << AMD_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_ID_WIDTH) - 1)
      << AMD_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_ID_SHIFT,

   AMD_CODE_PROPERTY_ENABLE_SGPR_FLAT_SCRATCH_INIT_SHIFT = 5,
   AMD_CODE_PROPERTY_ENABLE_SGPR_FLAT_SCRATCH_INIT_WIDTH = 1,
   AMD_CODE_PROPERTY_ENABLE_SGPR_FLAT_SCRATCH_INIT =
      ((1 << AMD_CODE_PROPERTY_ENABLE_SGPR_FLAT_SCRATCH_INIT_WIDTH) - 1)
      << AMD_CODE_PROPERTY_ENABLE_SGPR_FLAT_SCRATCH_INIT_SHIFT,

   AMD_CODE_PROPERTY_ENABLE_SGPR_PRIVATE_SEGMENT_SIZE_SHIFT = 6,
   AMD_CODE_PROPERTY_ENABLE_SGPR_PRIVATE_SEGMENT_SIZE_WIDTH = 1,
   AMD_CODE_PROPERTY_ENABLE_SGPR_PRIVATE_SEGMENT_SIZE =
      ((1 << AMD_CODE_PROPERTY_ENABLE_SGPR_PRIVATE_SEGMENT_SIZE_WIDTH) - 1)
      << AMD_CODE_PROPERTY_ENABLE_SGPR_PRIVATE_SEGMENT_SIZE_SHIFT,

   AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_X_SHIFT = 7,
   AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_X_WIDTH = 1,
   AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_X =
      ((1 << AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_X_WIDTH) - 1)
      << AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_X_SHIFT,

   AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_Y_SHIFT = 8,
   AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_Y_WIDTH = 1,
   AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_Y =
      ((1 << AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_Y_WIDTH) - 1)
      << AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_Y_SHIFT,

   AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_Z_SHIFT = 9,
   AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_Z_WIDTH = 1,
   AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_Z =
      ((1 << AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_Z_WIDTH) - 1)
      << AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_Z_SHIFT,

   AMD_CODE_PROPERTY_RESERVED1_SHIFT = 10,
   AMD_CODE_PROPERTY_RESERVED1_WIDTH = 6,
   AMD_CODE_PROPERTY_RESERVED1 = ((1 << AMD_CODE_PROPERTY_RESERVED1_WIDTH) - 1)
                                 << AMD_CODE_PROPERTY_RESERVED1_SHIFT,

   /* Control wave ID base counter for GDS ordered-append. Used to set
    * COMPUTE_DISPATCH_INITIATOR.ORDERED_APPEND_ENBL. (Not sure if
    * ORDERED_APPEND_MODE also needs to be settable)
    */
   AMD_CODE_PROPERTY_ENABLE_ORDERED_APPEND_GDS_SHIFT = 16,
   AMD_CODE_PROPERTY_ENABLE_ORDERED_APPEND_GDS_WIDTH = 1,
   AMD_CODE_PROPERTY_ENABLE_ORDERED_APPEND_GDS =
      ((1 << AMD_CODE_PROPERTY_ENABLE_ORDERED_APPEND_GDS_WIDTH) - 1)
      << AMD_CODE_PROPERTY_ENABLE_ORDERED_APPEND_GDS_SHIFT,

   /* The interleave (swizzle) element size in bytes required by the
    * code for private memory. This must be 2, 4, 8 or 16. This value
    * is provided to the finalizer when it is invoked and is recorded
    * here. The hardware will interleave the memory requests of each
    * lane of a wavefront by this element size to ensure each
    * work-item gets a distinct memory memory location. Therefore, the
    * finalizer ensures that all load and store operations done to
    * private memory do not exceed this size. For example, if the
    * element size is 4 (32-bits or dword) and a 64-bit value must be
    * loaded, the finalizer will generate two 32-bit loads. This
    * ensures that the interleaving will get the work-item
    * specific dword for both halves of the 64-bit value. If it just
    * did a 64-bit load then it would get one dword which belonged to
    * its own work-item, but the second dword would belong to the
    * adjacent lane work-item since the interleaving is in dwords.
    *
    * The value used must match the value that the runtime configures
    * the GPU flat scratch (SH_STATIC_MEM_CONFIG.ELEMENT_SIZE). This
    * is generally DWORD.
    *
    * USE VALUES FROM THE AMD_ELEMENT_BYTE_SIZE_T ENUM.
    */
   AMD_CODE_PROPERTY_PRIVATE_ELEMENT_SIZE_SHIFT = 17,
   AMD_CODE_PROPERTY_PRIVATE_ELEMENT_SIZE_WIDTH = 2,
   AMD_CODE_PROPERTY_PRIVATE_ELEMENT_SIZE =
      ((1 << AMD_CODE_PROPERTY_PRIVATE_ELEMENT_SIZE_WIDTH) - 1)
      << AMD_CODE_PROPERTY_PRIVATE_ELEMENT_SIZE_SHIFT,

   /* Are global memory addresses 64 bits. Must match
    * amd_kernel_code_t.hsail_machine_model ==
    * HSA_MACHINE_LARGE. Must also match
    * SH_MEM_CONFIG.PTR32 (GFX6 (SI)/GFX7 (CI)),
    * SH_MEM_CONFIG.ADDRESS_MODE (GFX8 (VI)+).
    */
   AMD_CODE_PROPERTY_IS_PTR64_SHIFT = 19,
   AMD_CODE_PROPERTY_IS_PTR64_WIDTH = 1,
   AMD_CODE_PROPERTY_IS_PTR64 = ((1 << AMD_CODE_PROPERTY_IS_PTR64_WIDTH) - 1)
                                << AMD_CODE_PROPERTY_IS_PTR64_SHIFT,

   /* Indicate if the generated ISA is using a dynamically sized call
    * stack. This can happen if calls are implemented using a call
    * stack and recursion, alloca or calls to indirect functions are
    * present. In these cases the Finalizer cannot compute the total
    * private segment size at compile time. In this case the
    * workitem_private_segment_byte_size only specifies the statically
    * know private segment size, and additional space must be added
    * for the call stack.
    */
   AMD_CODE_PROPERTY_IS_DYNAMIC_CALLSTACK_SHIFT = 20,
   AMD_CODE_PROPERTY_IS_DYNAMIC_CALLSTACK_WIDTH = 1,
   AMD_CODE_PROPERTY_IS_DYNAMIC_CALLSTACK =
      ((1 << AMD_CODE_PROPERTY_IS_DYNAMIC_CALLSTACK_WIDTH) - 1)
      << AMD_CODE_PROPERTY_IS_DYNAMIC_CALLSTACK_SHIFT,

   /* Indicate if code generated has support for debugging. */
   AMD_CODE_PROPERTY_IS_DEBUG_SUPPORTED_SHIFT = 21,
   AMD_CODE_PROPERTY_IS_DEBUG_SUPPORTED_WIDTH = 1,
   AMD_CODE_PROPERTY_IS_DEBUG_SUPPORTED = ((1 << AMD_CODE_PROPERTY_IS_DEBUG_SUPPORTED_WIDTH) - 1)
                                          << AMD_CODE_PROPERTY_IS_DEBUG_SUPPORTED_SHIFT,

   AMD_CODE_PROPERTY_IS_XNACK_SUPPORTED_SHIFT = 22,
   AMD_CODE_PROPERTY_IS_XNACK_SUPPORTED_WIDTH = 1,
   AMD_CODE_PROPERTY_IS_XNACK_SUPPORTED = ((1 << AMD_CODE_PROPERTY_IS_XNACK_SUPPORTED_WIDTH) - 1)
                                          << AMD_CODE_PROPERTY_IS_XNACK_SUPPORTED_SHIFT,

   AMD_CODE_PROPERTY_RESERVED2_SHIFT = 23,
   AMD_CODE_PROPERTY_RESERVED2_WIDTH = 9,
   AMD_CODE_PROPERTY_RESERVED2 = ((1 << AMD_CODE_PROPERTY_RESERVED2_WIDTH) - 1)
                                 << AMD_CODE_PROPERTY_RESERVED2_SHIFT
};

/* AMD Kernel Code Object (amd_kernel_code_t). GPU CP uses the AMD Kernel
 * Code Object to set up the hardware to execute the kernel dispatch.
 *
 * Initial Kernel Register State.
 *
 * Initial kernel register state will be set up by CP/SPI prior to the start
 * of execution of every wavefront. This is limited by the constraints of the
 * current hardware.
 *
 * The order of the SGPR registers is defined, but the Finalizer can specify
 * which ones are actually setup in the amd_kernel_code_t object using the
 * enable_sgpr_* bit fields. The register numbers used for enabled registers
 * are dense starting at SGPR0: the first enabled register is SGPR0, the next
 * enabled register is SGPR1 etc.; disabled registers do not have an SGPR
 * number.
 *
 * The initial SGPRs comprise up to 16 User SRGPs that are set up by CP and
 * apply to all waves of the grid. It is possible to specify more than 16 User
 * SGPRs using the enable_sgpr_* bit fields, in which case only the first 16
 * are actually initialized. These are then immediately followed by the System
 * SGPRs that are set up by ADC/SPI and can have different values for each wave
 * of the grid dispatch.
 *
 * SGPR register initial state is defined as follows:
 *
 * Private Segment Buffer (enable_sgpr_private_segment_buffer):
 *   Number of User SGPR registers: 4. V# that can be used, together with
 *   Scratch Wave Offset as an offset, to access the Private/Spill/Arg
 *   segments using a segment address. It must be set as follows:
 *     - Base address: of the scratch memory area used by the dispatch. It
 *       does not include the scratch wave offset. It will be the per process
 *       SH_HIDDEN_PRIVATE_BASE_VMID plus any offset from this dispatch (for
 *       example there may be a per pipe offset, or per AQL Queue offset).
 *     - Stride + data_format: Element Size * Index Stride (???)
 *     - Cache swizzle: ???
 *     - Swizzle enable: SH_STATIC_MEM_CONFIG.SWIZZLE_ENABLE (must be 1 for
 *       scratch)
 *     - Num records: Flat Scratch Work Item Size / Element Size (???)
 *     - Dst_sel_*: ???
 *     - Num_format: ???
 *     - Element_size: SH_STATIC_MEM_CONFIG.ELEMENT_SIZE (will be DWORD, must
 *       agree with amd_kernel_code_t.privateElementSize)
 *     - Index_stride: SH_STATIC_MEM_CONFIG.INDEX_STRIDE (will be 64 as must
 *       be number of wavefront lanes for scratch, must agree with
 *       amd_kernel_code_t.wavefrontSize)
 *     - Add tid enable: 1
 *     - ATC: from SH_MEM_CONFIG.PRIVATE_ATC,
 *     - Hash_enable: ???
 *     - Heap: ???
 *     - Mtype: from SH_STATIC_MEM_CONFIG.PRIVATE_MTYPE
 *     - Type: 0 (a buffer) (???)
 *
 * Dispatch Ptr (enable_sgpr_dispatch_ptr):
 *   Number of User SGPR registers: 2. 64 bit address of AQL dispatch packet
 *   for kernel actually executing.
 *
 * Queue Ptr (enable_sgpr_queue_ptr):
 *   Number of User SGPR registers: 2. 64 bit address of AmdQueue object for
 *   AQL queue on which the dispatch packet was queued.
 *
 * Kernarg Segment Ptr (enable_sgpr_kernarg_segment_ptr):
 *   Number of User SGPR registers: 2. 64 bit address of Kernarg segment. This
 *   is directly copied from the kernargPtr in the dispatch packet. Having CP
 *   load it once avoids loading it at the beginning of every wavefront.
 *
 * Dispatch Id (enable_sgpr_dispatch_id):
 *   Number of User SGPR registers: 2. 64 bit Dispatch ID of the dispatch
 *   packet being executed.
 *
 * Flat Scratch Init (enable_sgpr_flat_scratch_init):
 *   Number of User SGPR registers: 2. This is 2 SGPRs.
 *
 *   For CI/VI:
 *     The first SGPR is a 32 bit byte offset from SH_MEM_HIDDEN_PRIVATE_BASE
 *     to base of memory for scratch for this dispatch. This is the same offset
 *     used in computing the Scratch Segment Buffer base address. The value of
 *     Scratch Wave Offset must be added by the kernel code and moved to
 *     SGPRn-4 for use as the FLAT SCRATCH BASE in flat memory instructions.
 *
 *     The second SGPR is 32 bit byte size of a single work-item's scratch
 *     memory usage. This is directly loaded from the dispatch packet Private
 *     Segment Byte Size and rounded up to a multiple of DWORD.
 *
 *     \todo [Does CP need to round this to >4 byte alignment?]
 *
 *     The kernel code must move to SGPRn-3 for use as the FLAT SCRATCH SIZE in
 *     flat memory instructions. Having CP load it once avoids loading it at
 *     the beginning of every wavefront.
 *
 * Private Segment Size (enable_sgpr_private_segment_size):
 *   Number of User SGPR registers: 1. The 32 bit byte size of a single
 *   work-item's scratch memory allocation. This is the value from the dispatch
 *   packet. Private Segment Byte Size rounded up by CP to a multiple of DWORD.
 *
 *   \todo [Does CP need to round this to >4 byte alignment?]
 *
 *   Having CP load it once avoids loading it at the beginning of every
 *   wavefront.
 *
 *   \todo [This will not be used for CI/VI since it is the same value as
 *   the second SGPR of Flat Scratch Init.
 *
 * Grid Work-Group Count X (enable_sgpr_grid_workgroup_count_x):
 *   Number of User SGPR registers: 1. 32 bit count of the number of
 *   work-groups in the X dimension for the grid being executed. Computed from
 *   the fields in the HsaDispatchPacket as
 *   ((gridSize.x+workgroupSize.x-1)/workgroupSize.x).
 *
 * Grid Work-Group Count Y (enable_sgpr_grid_workgroup_count_y):
 *   Number of User SGPR registers: 1. 32 bit count of the number of
 *   work-groups in the Y dimension for the grid being executed. Computed from
 *   the fields in the HsaDispatchPacket as
 *   ((gridSize.y+workgroupSize.y-1)/workgroupSize.y).
 *
 *   Only initialized if <16 previous SGPRs initialized.
 *
 * Grid Work-Group Count Z (enable_sgpr_grid_workgroup_count_z):
 *   Number of User SGPR registers: 1. 32 bit count of the number of
 *   work-groups in the Z dimension for the grid being executed. Computed
 *   from the fields in the HsaDispatchPacket as
 *   ((gridSize.z+workgroupSize.z-1)/workgroupSize.z).
 *
 *   Only initialized if <16 previous SGPRs initialized.
 *
 * Work-Group Id X (enable_sgpr_workgroup_id_x):
 *   Number of System SGPR registers: 1. 32 bit work group id in X dimension
 *   of grid for wavefront. Always present.
 *
 * Work-Group Id Y (enable_sgpr_workgroup_id_y):
 *   Number of System SGPR registers: 1. 32 bit work group id in Y dimension
 *   of grid for wavefront.
 *
 * Work-Group Id Z (enable_sgpr_workgroup_id_z):
 *   Number of System SGPR registers: 1. 32 bit work group id in Z dimension
 *   of grid for wavefront. If present then Work-group Id Y will also be
 *   present
 *
 * Work-Group Info (enable_sgpr_workgroup_info):
 *   Number of System SGPR registers: 1. {first_wave, 14'b0000,
 *   ordered_append_term[10:0], threadgroup_size_in_waves[5:0]}
 *
 * Private Segment Wave Byte Offset
 * (enable_sgpr_private_segment_wave_byte_offset):
 *   Number of System SGPR registers: 1. 32 bit byte offset from base of
 *   dispatch scratch base. Must be used as an offset with Private/Spill/Arg
 *   segment address when using Scratch Segment Buffer. It must be added to
 *   Flat Scratch Offset if setting up FLAT SCRATCH for flat addressing.
 *
 *
 * The order of the VGPR registers is defined, but the Finalizer can specify
 * which ones are actually setup in the amd_kernel_code_t object using the
 * enableVgpr*  bit fields. The register numbers used for enabled registers
 * are dense starting at VGPR0: the first enabled register is VGPR0, the next
 * enabled register is VGPR1 etc.; disabled registers do not have an VGPR
 * number.
 *
 * VGPR register initial state is defined as follows:
 *
 * Work-Item Id X (always initialized):
 *   Number of registers: 1. 32 bit work item id in X dimension of work-group
 *   for wavefront lane.
 *
 * Work-Item Id X (enable_vgpr_workitem_id > 0):
 *   Number of registers: 1. 32 bit work item id in Y dimension of work-group
 *   for wavefront lane.
 *
 * Work-Item Id X (enable_vgpr_workitem_id > 0):
 *   Number of registers: 1. 32 bit work item id in Z dimension of work-group
 *   for wavefront lane.
 *
 *
 * The setting of registers is being done by existing GPU hardware as follows:
 *   1) SGPRs before the Work-Group Ids are set by CP using the 16 User Data
 *      registers.
 *   2) Work-group Id registers X, Y, Z are set by SPI which supports any
 *      combination including none.
 *   3) Scratch Wave Offset is also set by SPI which is why its value cannot
 *      be added into the value Flat Scratch Offset which would avoid the
 *      Finalizer generated prolog having to do the add.
 *   4) The VGPRs are set by SPI which only supports specifying either (X),
 *      (X, Y) or (X, Y, Z).
 *
 * Flat Scratch Dispatch Offset and Flat Scratch Size are adjacent SGRRs so
 * they can be moved as a 64 bit value to the hardware required SGPRn-3 and
 * SGPRn-4 respectively using the Finalizer ?FLAT_SCRATCH? Register.
 *
 * The global segment can be accessed either using flat operations or buffer
 * operations. If buffer operations are used then the Global Buffer used to
 * access HSAIL Global/Readonly/Kernarg (which are combine) segments using a
 * segment address is not passed into the kernel code by CP since its base
 * address is always 0. Instead the Finalizer generates prolog code to
 * initialize 4 SGPRs with a V# that has the following properties, and then
 * uses that in the buffer instructions:
 *   - base address of 0
 *   - no swizzle
 *   - ATC=1
 *   - MTYPE set to support memory coherence specified in
 *     amd_kernel_code_t.globalMemoryCoherence
 *
 * When the Global Buffer is used to access the Kernarg segment, must add the
 * dispatch packet kernArgPtr to a kernarg segment address before using this V#.
 * Alternatively scalar loads can be used if the kernarg offset is uniform, as
 * the kernarg segment is constant for the duration of the kernel execution.
 */

typedef struct amd_kernel_code_s {
   uint32_t amd_kernel_code_version_major;
   uint32_t amd_kernel_code_version_minor;
   uint16_t amd_machine_kind;
   uint16_t amd_machine_version_major;
   uint16_t amd_machine_version_minor;
   uint16_t amd_machine_version_stepping;

   /* Byte offset (possibly negative) from start of amd_kernel_code_t
    * object to kernel's entry point instruction. The actual code for
    * the kernel is required to be 256 byte aligned to match hardware
    * requirements (SQ cache line is 16). The code must be position
    * independent code (PIC) for AMD devices to give runtime the
    * option of copying code to discrete GPU memory or APU L2
    * cache. The Finalizer should endeavour to allocate all kernel
    * machine code in contiguous memory pages so that a device
    * pre-fetcher will tend to only pre-fetch Kernel Code objects,
    * improving cache performance.
    */
   int64_t kernel_code_entry_byte_offset;

   /* Range of bytes to consider prefetching expressed as an offset
    * and size. The offset is from the start (possibly negative) of
    * amd_kernel_code_t object. Set both to 0 if no prefetch
    * information is available.
    */
   int64_t kernel_code_prefetch_byte_offset;
   uint64_t kernel_code_prefetch_byte_size;

   /* Number of bytes of scratch backing memory required for full
    * occupancy of target chip. This takes into account the number of
    * bytes of scratch per work-item, the wavefront size, the maximum
    * number of wavefronts per CU, and the number of CUs. This is an
    * upper limit on scratch. If the grid being dispatched is small it
    * may only need less than this. If the kernel uses no scratch, or
    * the Finalizer has not computed this value, it must be 0.
    */
   uint64_t max_scratch_backing_memory_byte_size;

   /* Shader program settings for CS. Contains COMPUTE_PGM_RSRC1 and
    * COMPUTE_PGM_RSRC2 registers.
    */
   uint64_t compute_pgm_resource_registers;

   /* Code properties. See amd_code_property_mask_t for a full list of
    * properties.
    */
   uint32_t code_properties;

   /* The amount of memory required for the combined private, spill
    * and arg segments for a work-item in bytes. If
    * is_dynamic_callstack is 1 then additional space must be added to
    * this value for the call stack.
    */
   uint32_t workitem_private_segment_byte_size;

   /* The amount of group segment memory required by a work-group in
    * bytes. This does not include any dynamically allocated group
    * segment memory that may be added when the kernel is
    * dispatched.
    */
   uint32_t workgroup_group_segment_byte_size;

   /* Number of byte of GDS required by kernel dispatch. Must be 0 if
    * not using GDS.
    */
   uint32_t gds_segment_byte_size;

   /* The size in bytes of the kernarg segment that holds the values
    * of the arguments to the kernel. This could be used by CP to
    * prefetch the kernarg segment pointed to by the dispatch packet.
    */
   uint64_t kernarg_segment_byte_size;

   /* Number of fbarrier's used in the kernel and all functions it
    * calls. If the implementation uses group memory to allocate the
    * fbarriers then that amount must already be included in the
    * workgroup_group_segment_byte_size total.
    */
   uint32_t workgroup_fbarrier_count;

   /* Number of scalar registers used by a wavefront. This includes
    * the special SGPRs for VCC, Flat Scratch Base, Flat Scratch Size
    * and XNACK (for GFX8 (VI)). It does not include the 16 SGPR added if a
    * trap handler is enabled. Used to set COMPUTE_PGM_RSRC1.SGPRS.
    */
   uint16_t wavefront_sgpr_count;

   /* Number of vector registers used by each work-item. Used to set
    * COMPUTE_PGM_RSRC1.VGPRS.
    */
   uint16_t workitem_vgpr_count;

   /* If reserved_vgpr_count is 0 then must be 0. Otherwise, this is the
    * first fixed VGPR number reserved.
    */
   uint16_t reserved_vgpr_first;

   /* The number of consecutive VGPRs reserved by the client. If
    * is_debug_supported then this count includes VGPRs reserved
    * for debugger use.
    */
   uint16_t reserved_vgpr_count;

   /* If reserved_sgpr_count is 0 then must be 0. Otherwise, this is the
    * first fixed SGPR number reserved.
    */
   uint16_t reserved_sgpr_first;

   /* The number of consecutive SGPRs reserved by the client. If
    * is_debug_supported then this count includes SGPRs reserved
    * for debugger use.
    */
   uint16_t reserved_sgpr_count;

   /* If is_debug_supported is 0 then must be 0. Otherwise, this is the
    * fixed SGPR number used to hold the wave scratch offset for the
    * entire kernel execution, or uint16_t(-1) if the register is not
    * used or not known.
    */
   uint16_t debug_wavefront_private_segment_offset_sgpr;

   /* If is_debug_supported is 0 then must be 0. Otherwise, this is the
    * fixed SGPR number of the first of 4 SGPRs used to hold the
    * scratch V# used for the entire kernel execution, or uint16_t(-1)
    * if the registers are not used or not known.
    */
   uint16_t debug_private_segment_buffer_sgpr;

   /* The maximum byte alignment of variables used by the kernel in
    * the specified memory segment. Expressed as a power of two. Must
    * be at least HSA_POWERTWO_16.
    */
   uint8_t kernarg_segment_alignment;
   uint8_t group_segment_alignment;
   uint8_t private_segment_alignment;

   /* Wavefront size expressed as a power of two. Must be a power of 2
    * in range 1..64 inclusive. Used to support runtime query that
    * obtains wavefront size, which may be used by application to
    * allocated dynamic group memory and set the dispatch work-group
    * size.
    */
   uint8_t wavefront_size;

   int32_t call_convention;
   uint8_t reserved3[12];
   uint64_t runtime_loader_kernel_symbol;
   uint64_t control_directives[16];
} amd_kernel_code_t;

#endif // AMDKERNELCODET_H