none/tests/arm64/dc_cvax.c

   1 #include <assert.h>
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5
   6 int main(void)
   7 {
   8    char buf[64] __attribute__((aligned(64)));
   9    unsigned long check_dc_zva;
  10    unsigned long check_dc_cvap;
  11    memset(buf, 0xAA, 64);
  12    asm volatile("mrs %0, dczid_el0" : "=r" (check_dc_zva));
  13    asm volatile("dc cvac, %0" :: "r" (buf));
  14    asm volatile("dc cvau, %0" :: "r" (buf));
  15    asm volatile("mrs %0, id_aa64isar1_el1" : "=r" (check_dc_cvap));
  16    if (check_dc_cvap & 0x3) {
  17       asm volatile("add x8, sp, #0x40\n"
  18                    ".inst 0xd50b7c28\n");
  19    }
  20    if (check_dc_cvap & 0x2) {
  21       asm volatile("add x8, sp, #0x40\n"
  22                    ".inst 0xd50b7c28");
  23    }
  24    asm volatile("dc civac, %0" :: "r" (buf));
  25    if (!(check_dc_zva & 0x10)) {
  26       size_t buf_size = (1U << ((check_dc_zva & 0xf) + 2));
  27       //printf("lg 2 word count %lu byte count %zu\n", check_dc_zva & 0xfUL, buf_size);
  28       char* var_buf;
  29       if (posix_memalign((void**)&var_buf, buf_size, buf_size) == 0) {
  30          asm volatile("dc zva, %0" :: "r" (var_buf));
  31          assert(var_buf[0] == 0);
  32          assert(var_buf[buf_size - 1] == 0);
  33          free(var_buf);
  34       } else {
  35          perror("posix_memalign failed:");
  36          exit(1);
  37       }
  38    }
  39 }