SMSTART
Enables access to Streaming SVE mode and SME architectural state.
SMSTART enters Streaming SVE mode, and enables the SME ZA array storage.
SMSTART SM enters Streaming SVE mode, but does not enable the SME ZA array storage.
SMSTART ZA enables the SME ZA array storage, but does not cause an entry to Streaming SVE mode.
This is an alias of
MSR (immediate).
This means:
-
The encodings in this description are named to match the encodings of
MSR (immediate).
-
The description of
MSR (immediate)
gives the operational pseudocode for this instruction.
System
(FEAT_SME)
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | x | x | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| | | op1 | | CRm | op2 | |
Assembler Symbols
| <option> |
Is an optional mode,
encoded in
CRm<2:1> :
| CRm<2:1> |
<option> |
| 00 |
RESERVED |
| 01 |
SM |
| 10 |
ZA |
| 11 |
[no specifier] |
|
| <pstatefield> |
Is a PSTATE field name. For the MSR instruction, this is
encoded in
op1:op2:CRm :
| op1 |
op2 |
CRm |
<pstatefield> |
Architectural Feature |
| 000 |
00x |
xxxx |
SEE PSTATE |
-
|
| 000 |
010 |
xxxx |
SEE PSTATE |
-
|
| 000 |
011 |
xxxx |
UAO |
FEAT_UAO
|
| 000 |
100 |
xxxx |
PAN |
FEAT_PAN
|
| 000 |
101 |
xxxx |
SPSel |
-
|
| 000 |
11x |
xxxx |
RESERVED |
-
|
| 001 |
000 |
000x |
ALLINT |
FEAT_NMI
|
| 001 |
000 |
001x |
RESERVED |
-
|
| 001 |
000 |
01xx |
RESERVED |
-
|
| 001 |
000 |
1xxx |
RESERVED |
-
|
| 001 |
001 |
xxxx |
RESERVED |
-
|
| 001 |
01x |
xxxx |
RESERVED |
-
|
| 001 |
1xx |
xxxx |
RESERVED |
-
|
| 010 |
xxx |
xxxx |
RESERVED |
-
|
| 011 |
000 |
xxxx |
RESERVED |
-
|
| 011 |
001 |
xxxx |
SSBS |
FEAT_SSBS
|
| 011 |
010 |
xxxx |
DIT |
FEAT_DIT
|
| 011 |
011 |
000x |
RESERVED |
-
|
| 011 |
011 |
001x |
SVCRSM |
FEAT_SME
|
| 011 |
011 |
010x |
SVCRZA |
FEAT_SME
|
| 011 |
011 |
011x |
SVCRSMZA |
FEAT_SME
|
| 011 |
011 |
1xxx |
RESERVED |
-
|
| 011 |
100 |
xxxx |
TCO |
FEAT_MTE
|
| 011 |
101 |
xxxx |
RESERVED |
-
|
| 011 |
110 |
xxxx |
DAIFSet |
-
|
| 011 |
111 |
xxxx |
DAIFClr |
-
|
| 1xx |
xxx |
xxxx |
RESERVED |
-
|
For the SMSTART and SMSTOP aliases, this is encoded in "CRm<2:1>", where 0b01 specifies SVCRSM, 0b10 specifies SVCRZA, and 0b11 specifies SVCRSMZA.
|
Operation
The description of
MSR (immediate)
gives the operational pseudocode for this instruction.
Internal version only: isa v33.11seprel, AdvSIMD v29.05, pseudocode v2021-09_rel, sve v2021-09_rc3d
; Build timestamp: 2021-10-06T11:41
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