add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/arch/x86/include/asm/time.h
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@@ -7,6 +7,7 @@
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 extern void hpet_time_init(void);
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 extern void time_init(void);
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+extern bool pit_timer_init(void);
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 extern struct clock_event_device *global_clock_event;
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