mirror of https://github.com/ARMmbed/mbed-os.git
66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
|
/* mbed Microcontroller Library
|
||
|
|
* Copyright (c) 2017 ARM Limited
|
||
|
|
*
|
||
|
|
* 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 "cmsis.h"
|
||
|
|
#include "hal/critical_section_api.h"
|
||
|
|
#include "platform/mbed_assert.h"
|
||
|
|
#include "platform/mbed_toolchain.h"
|
||
|
|
|
||
|
|
#include <stdbool.h>
|
||
|
|
|
||
|
|
static volatile bool critical_interrupts_enabled = false;
|
||
|
|
|
||
|
|
static bool are_interrupts_enabled(void)
|
||
|
|
{
|
||
|
|
#if defined(__CORTEX_A9)
|
||
|
|
return ((__get_CPSR() & 0x80) == 0);
|
||
|
|
#else
|
||
|
|
return ((__get_PRIMASK() & 0x1) == 0);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
MBED_WEAK void hal_critical_section_enter(void)
|
||
|
|
{
|
||
|
|
critical_interrupts_enabled = are_interrupts_enabled();
|
||
|
|
|
||
|
|
#ifndef FEATURE_UVISOR
|
||
|
|
// If we are in a nested critical section and interrupts are still enabled
|
||
|
|
// something has gone wrong.
|
||
|
|
MBED_ASSERT(!are_interrupts_enabled());
|
||
|
|
#else
|
||
|
|
#warning "core_util_critical_section_enter needs fixing to work from unprivileged code"
|
||
|
|
#endif /* FEATURE_UVISOR */
|
||
|
|
|
||
|
|
__disable_irq();
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
MBED_WEAK void hal_critical_section_exit()
|
||
|
|
{
|
||
|
|
// FIXME
|
||
|
|
#ifndef FEATURE_UVISOR
|
||
|
|
// Interrupts must be disabled on invoking an exit from a critical section
|
||
|
|
MBED_ASSERT(!are_interrupts_enabled());
|
||
|
|
#else
|
||
|
|
#warning "core_util_critical_section_exit needs fixing to work from unprivileged code"
|
||
|
|
#endif /* FEATURE_UVISOR */
|
||
|
|
|
||
|
|
// Restore the IRQs to their state prior to entering the critical section
|
||
|
|
if (critical_interrupts_enabled == true) {
|
||
|
|
__enable_irq();
|
||
|
|
}
|
||
|
|
}
|