projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 328c17af | 1 | /* Support routine for SME. |
| a945c346 | 2 | Copyright (C) 2023-2024 Free Software Foundation, Inc. |
| 328c17af SN |
3 | |
| 4 | This file is part of GCC. | |
| 5 | ||
| 6 | GCC is free software; you can redistribute it and/or modify it | |
| 7 | under the terms of the GNU General Public License as published | |
| 8 | by the Free Software Foundation; either version 3, or (at your | |
| 9 | option) any later version. | |
| 10 | ||
| 11 | GCC is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
| 13 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
| 14 | License for more details. | |
| 15 | ||
| 16 | Under Section 7 of GPL version 3, you are granted additional | |
| 17 | permissions described in the GCC Runtime Library Exception, version | |
| 18 | 3.1, as published by the Free Software Foundation. | |
| 19 | ||
| 20 | You should have received a copy of the GNU General Public License and | |
| 21 | a copy of the GCC Runtime Library Exception along with this program; | |
| 22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
| 23 | <http://www.gnu.org/licenses/>. */ | |
| 24 | ||
| 25 | #include "aarch64-asm.h" | |
| 26 | ||
| 27 | /* Query SME state. Call ABI: | |
| 28 | - Private ZA, streaming-compatible. | |
| 29 | - x2-x15, x19-x29, sp and fp regs are call preserved. | |
| 30 | - Takes no argument. | |
| 31 | - Returns SME state in x0 and TPIDR2_EL0 in x1. */ | |
| 32 | ||
| 33 | .hidden __aarch64_have_sme | |
| 34 | ||
| 35 | variant_pcs (__arm_sme_state) | |
| 36 | ||
| 37 | ENTRY (__arm_sme_state) | |
| 38 | /* Check if SME is available. */ | |
| 39 | adrp x1, __aarch64_have_sme | |
| 40 | ldrb w1, [x1, :lo12:__aarch64_have_sme] | |
| 41 | cbz w1, L(nosme) | |
| 42 | ||
| 43 | /* Expose the bottom 2 bits of svcr (SM, ZA) in x0 and set the | |
| 44 | top 2 bits indicating that SME and TPIDR2_EL0 are available. */ | |
| 45 | .inst 0xd53b4240 /* mrs x0, svcr */ | |
| 46 | .inst 0xd53bd0a1 /* mrs x1, tpidr2_el0 */ | |
| 47 | and x0, x0, 3 | |
| 48 | orr x0, x0, 0xc000000000000000 | |
| 49 | ret | |
| 50 | ||
| 51 | L(nosme): | |
| 52 | mov x0, 0 | |
| 53 | mov x1, 0 | |
| 54 | ret | |
| 55 | END (__arm_sme_state) |