| /* boot_time.c - Boot Time measurement task */ |
| |
| /* |
| * Copyright (c) 2013-2015 Wind River Systems, Inc. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /** |
| * @file |
| * @brief Measure boot time for nanokernel project |
| * |
| * Measuring the boot time for the nanokernel project includes |
| * 1. From reset to kernel's __start |
| * 2. From __start to main() |
| * 3. From __start to task |
| */ |
| |
| #include <zephyr.h> |
| #include <tc_util.h> |
| |
| /* externs */ |
| extern uint64_t __start_tsc; /* timestamp when kernel begins executing */ |
| extern uint64_t __main_tsc; /* timestamp when main() begins executing */ |
| |
| void bootTimeTask(void) |
| { |
| uint64_t task_tsc; /* timestamp at beginning of first task */ |
| uint64_t _start_us; /* being of __start timestamp in us */ |
| uint64_t main_us; /* begin of main timestamp in us */ |
| uint64_t task_us; /* begin of task timestamp in us */ |
| uint64_t s_main_tsc; /* __start->main timestamp */ |
| uint64_t s_task_tsc; /*__start->task timestamp */ |
| |
| task_tsc = _tsc_read(); |
| |
| _start_us = __start_tsc / CONFIG_CPU_CLOCK_FREQ_MHZ; |
| s_main_tsc = __main_tsc-__start_tsc; |
| main_us = s_main_tsc / CONFIG_CPU_CLOCK_FREQ_MHZ; |
| s_task_tsc = task_tsc-__start_tsc; |
| task_us = s_task_tsc / CONFIG_CPU_CLOCK_FREQ_MHZ; |
| |
| /* Indicate start for sanity test suite */ |
| TC_START("Boot Time Measurement"); |
| |
| /* Only print lower 32bit of time result */ |
| TC_PRINT("NanoKernel Boot Result: Clock Frequency: %d MHz\n", |
| CONFIG_CPU_CLOCK_FREQ_MHZ); |
| TC_PRINT("__start : %d cycles, %d us\n", |
| (uint32_t)(__start_tsc & 0xFFFFFFFFULL), |
| (uint32_t) (_start_us & 0xFFFFFFFFULL)); |
| TC_PRINT("_start->main(): %d cycles, %d us\n", |
| (uint32_t)(s_main_tsc & 0xFFFFFFFFULL), |
| (uint32_t) (main_us & 0xFFFFFFFFULL)); |
| TC_PRINT("_start->task : %d cycles, %d us\n", |
| (uint32_t)(s_task_tsc & 0xFFFFFFFFULL), |
| (uint32_t) (task_us & 0xFFFFFFFFULL)); |
| |
| TC_PRINT("Boot Time Measurement finished\n"); |
| |
| /* for sanity regression test utility. */ |
| TC_END_RESULT(TC_PASS); |
| TC_END_REPORT(TC_PASS); |
| |
| } |
| |
| char __stack fiberStack[512]; |
| |
| /** |
| * |
| * @brief Nanokernel entry point |
| * |
| * @return N/A |
| */ |
| |
| void main(void) |
| { |
| /* record timestamp for nanokernel's main() function */ |
| __main_tsc = _tsc_read(); |
| |
| /* create bootTime fibers */ |
| task_fiber_start(fiberStack, 512, (nano_fiber_entry_t) bootTimeTask, |
| 0, 0, 6, 0); |
| } |