rpi4-osdev/part13-interrupts/include/multicore.h

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extern unsigned long spin_cpu0;
extern unsigned long spin_cpu1;
extern unsigned long spin_cpu2;
extern unsigned long spin_cpu3;
void start_core1(void (*func)(void));
void start_core2(void (*func)(void));
void start_core3(void (*func)(void));
void clear_core1(void);
void clear_core2(void);
void clear_core3(void);