1 /* 2 * Copyright (c) 2024 Raspberry Pi (Trading) Ltd. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 #include "hardware/sync/spin_lock.h" 7 spin_locks_reset(void)8void spin_locks_reset(void) { 9 for (uint i = 0; i < NUM_SPIN_LOCKS; i++) { 10 spin_unlock_unsafe(spin_lock_instance(i)); 11 } 12 } 13 spin_lock_init(uint lock_num)14spin_lock_t *spin_lock_init(uint lock_num) { 15 assert(lock_num < NUM_SPIN_LOCKS); 16 spin_lock_t *lock = spin_lock_instance(lock_num); 17 spin_unlock_unsafe(lock); 18 return lock; 19 } 20 21 #if PICO_USE_SW_SPIN_LOCKS 22 spin_lock_t _sw_spin_locks[NUM_SPIN_LOCKS]; 23 24 #if __ARM_ARCH_8M_MAIN__ && !PICO_SW_SPIN_LOCKS_NO_EXTEXCLALL 25 #include "pico/runtime_init.h" 26 #include "hardware/structs/m33.h" 27 spinlock_set_extexclall(void)28static void spinlock_set_extexclall(void) { 29 // Force use of global exclusive monitor for all exclusive load/stores: 30 // makes multicore exclusives work without adding MPU regions. For 31 // something more exotic, like having multicore exclusives in internal 32 // SRAM and also single-core exclusives in external PSRAM (not covered by 33 // the global monitor on RP2350) you must clear this and add your own 34 // Shareable regions. 35 // 36 // Setting PICO_SW_SPIN_LOCKS_NO_EXTEXCLALL == 1 will disable this code 37 m33_hw->actlr |= M33_ACTLR_EXTEXCLALL_BITS; 38 } 39 40 // PICO_RUNTIME_INIT_SPIN_LOCKS_RESET is fine as resetting them does not require EXTEXCLALL 41 PICO_RUNTIME_INIT_FUNC_PER_CORE(spinlock_set_extexclall, PICO_RUNTIME_INIT_SPIN_LOCKS_RESET); 42 #endif 43 #endif 44 45
