mirror of https://github.com/ARMmbed/mbed-os.git
64 lines
2.8 KiB
C++
64 lines
2.8 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2017 ARM Limited
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "rtos/Kernel.h"
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#include "mbed.h"
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namespace rtos {
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uint64_t Kernel::get_ms_count() {
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// CMSIS-RTOS 2.1.0 and 2.1.1 differ in the time type. We assume
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// our header at least matches the implementation, so we don't try looking
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// at the run-time version report. (There's no compile-time version report)
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// 2.1.0 uint64_t osKernelGetTickCount(void), not documented as callable from ISR (but RTX does allow)
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// 2.1.1 uint32_t osKernelGetTickCount(void), callable from ISR
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// 2.1.x who knows? We assume could go back to uint64_t
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if (sizeof osKernelGetTickCount() == sizeof(uint64_t)) {
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return osKernelGetTickCount();
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} else /* assume 32-bit */ {
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// Based on suggestion in CMSIS-RTOS 2.1.1 docs, but with reentrancy
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// protection for the tick memory. We use critical section rather than a
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// mutex, as hopefully this method can be callable from interrupt later -
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// only thing currently preventing it is that pre CMSIS RTOS 2.1.1, it's
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// not defined as safe.
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// We assume this is called multiple times per 32-bit wrap period (49 days).
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static uint32_t tick_h, tick_l;
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core_util_critical_section_enter();
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// The 2.1.1 API says this is legal from an ISR - we assume this means
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// it's also legal with interrupts disabled. RTX implementation kind
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// of conflates the two.
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uint32_t tick32 = osKernelGetTickCount();
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if (tick32 < tick_l) {
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tick_h++;
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}
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tick_l = tick32;
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uint64_t ret = ((uint64_t) tick_h << 32) | tick_l;
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core_util_critical_section_exit();
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return ret;
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}
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}
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}
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