| // Copyright 2025 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include <riscv_vector.h> |
| #include <stdint.h> |
| |
| uint32_t vma __attribute__((section(".data"))) = 0; |
| uint32_t vta __attribute__((section(".data"))) = 0; |
| uint32_t sew __attribute__((section(".data"))) = 0; |
| uint32_t lmul __attribute__((section(".data"))) = 0; |
| uint32_t vl __attribute__((section(".data"))) = 16; |
| uint32_t vtype __attribute__((section(".data"))) = ~0; |
| |
| int main(int argc, char **argv) { |
| uint32_t vtype_to_write = (vma << 7) | (vta << 6) | (sew << 3) | lmul; |
| asm volatile("vsetvl x0, %0, %1": : "r"(vl), "r"(vtype_to_write)); |
| uint32_t vtype_to_read; |
| asm volatile("csrr %0, vtype" : "=r"(vtype_to_read)); |
| vtype = vtype_to_read; |
| return 0; |
| } |
