rpi4-osdev/part10-multicore/multicore.h

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extern unsigned int spin_cpu0;
extern unsigned int spin_cpu1;
extern unsigned int spin_cpu2;
extern unsigned int spin_cpu3;
unsigned long load32(unsigned long address);
void start_core1(void (*func)(void));
void start_core2(void (*func)(void));
void start_core3(void (*func)(void));