| 1 | /* |
| 2 | * Simple Virtual Timer Test |
| 3 | * |
| 4 | * Copyright (c) 2020 Linaro Ltd |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 7 | */ |
| 8 | |
| 9 | #include <stdint.h> |
| 10 | #include <minilib.h> |
| 11 | |
| 12 | /* grabbed from Linux */ |
| 13 | #define __stringify_1(x...) #x |
| 14 | #define __stringify(x...) __stringify_1(x) |
| 15 | |
| 16 | #define read_sysreg(r) ({ \ |
| 17 | uint64_t __val; \ |
| 18 | asm volatile("mrs %0, " __stringify(r) : "=r" (__val)); \ |
| 19 | __val; \ |
| 20 | }) |
| 21 | |
| 22 | #define write_sysreg(r, v) do { \ |
| 23 | uint64_t __val = (uint64_t)(v); \ |
| 24 | asm volatile("msr " __stringify(r) ", %x0" \ |
| 25 | : : "rZ" (__val)); \ |
| 26 | } while (0) |
| 27 | |
| 28 | int main(void) |
| 29 | { |
| 30 | int i; |
| 31 | |
| 32 | ml_printf("VTimer Test\n"); |
| 33 | |
| 34 | write_sysreg(cntvoff_el2, 1); |
| 35 | write_sysreg(cntv_cval_el0, -1); |
| 36 | write_sysreg(cntv_ctl_el0, 1); |
| 37 | |
| 38 | ml_printf("cntvoff_el2=%lx\n", read_sysreg(cntvoff_el2)); |
| 39 | ml_printf("cntv_cval_el0=%lx\n", read_sysreg(cntv_cval_el0)); |
| 40 | ml_printf("cntv_ctl_el0=%lx\n", read_sysreg(cntv_ctl_el0)); |
| 41 | |
| 42 | /* Now read cval a few times */ |
| 43 | for (i = 0; i < 10; i++) { |
| 44 | ml_printf("%d: cntv_cval_el0=%lx\n", i, read_sysreg(cntv_cval_el0)); |
| 45 | } |
| 46 | |
| 47 | return 0; |
| 48 | } |