esp-idf/components/esp_hw_support/compare_set.c

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/*
* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "soc/compare_set.h"
#include "soc/spinlock.h"
#include "soc/soc_caps.h"
#if __XTENSA__ && SOC_SPIRAM_SUPPORTED
static spinlock_t global_extram_lock = SPINLOCK_INITIALIZER;
void compare_and_set_extram(volatile uint32_t *addr, uint32_t compare, uint32_t *set)
{
uint32_t intlevel, old_value;
__asm__ __volatile__ ("rsil %0, " XTSTR(XCHAL_EXCM_LEVEL) "\n"
: "=r"(intlevel));
spinlock_acquire(&global_extram_lock, SPINLOCK_WAIT_FOREVER);
old_value = *addr;
if (old_value == compare) {
*addr = *set;
}
spinlock_release(&global_extram_lock);
__asm__ __volatile__ ("memw \n"
"wsr %0, ps\n"
:: "r"(intlevel));
*set = old_value;
}
#else // __XTENSA__ && SOC_SPIRAM_SUPPORTED
void compare_and_set_extram(volatile uint32_t *addr, uint32_t compare, uint32_t *set)
{
compare_and_set_native(addr, compare, set);
}
#endif // endif