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.. _amdgpu_synid_gfx9_hwreg:
hwreg
=====
Bits of a hardware register being accessed.
The bits of this operand have the following meaning:
======= ===================== ============
Bits Description Value Range
======= ===================== ============
5:0 Register *id*. 0..63
10:6 First bit *offset*. 0..31
15:11 *Size* in bits. 1..32
======= ===================== ============
This operand may be specified as one of the following:
* An :ref:`integer_number<amdgpu_synid_integer_number>` or an :ref:`absolute_expression<amdgpu_synid_absolute_expression>`. The value must be in the range from 0 to 0xFFFF.
* An *hwreg* value which is described below.
==================================== ===============================================================================
Hwreg Value Syntax Description
==================================== ===============================================================================
hwreg({0..63}) All bits of a register indicated by the register *id*.
hwreg(<*name*>) All bits of a register indicated by the register *name*.
hwreg({0..63}, {0..31}, {1..32}) Register bits indicated by the register *id*, first bit *offset* and *size*.
hwreg(<*name*>, {0..31}, {1..32}) Register bits indicated by the register *name*, first bit *offset* and *size*.
==================================== ===============================================================================
Numeric values may be specified as positive :ref:`integer numbers<amdgpu_synid_integer_number>`
or :ref:`absolute expressions<amdgpu_synid_absolute_expression>`.
Predefined register *names* include:
============================== ==========================================
Name Description
============================== ==========================================
HW_REG_MODE Shader writable mode bits.
HW_REG_STATUS Shader read-only status.
HW_REG_TRAPSTS Trap status.
HW_REG_HW_ID Id of wave, simd, compute unit, etc.
HW_REG_GPR_ALLOC Per-wave SGPR and VGPR allocation.
HW_REG_LDS_ALLOC Per-wave LDS allocation.
HW_REG_IB_STS Counters of outstanding instructions.
HW_REG_SH_MEM_BASES Memory aperture.
HW_REG_TBA_LO tba_lo register.
HW_REG_TBA_HI tba_hi register.
HW_REG_TMA_LO tma_lo register.
HW_REG_TMA_HI tma_hi register.
============================== ==========================================
Examples:
.. parsed-literal::
reg = 1
offset = 2
size = 4
hwreg_enc = reg | (offset << 6) | ((size - 1) << 11)
s_getreg_b32 s2, 0x1881
s_getreg_b32 s2, hwreg_enc // the same as above
s_getreg_b32 s2, hwreg(1, 2, 4) // the same as above
s_getreg_b32 s2, hwreg(reg, offset, size) // the same as above
s_getreg_b32 s2, hwreg(15)
s_getreg_b32 s2, hwreg(51, 1, 31)
s_getreg_b32 s2, hwreg(HW_REG_LDS_ALLOC, 0, 1)
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