Squash commits for public release

kernel/include/drivers/timer/arm/arm64/timer.h

@@ -0,0 +1,10 @@
+#ifndef _KERNEL_DRIVERS_TIMER_ARM_ARM64_TIMER_H
+#define _KERNEL_DRIVERS_TIMER_ARM_ARM64_TIMER_H
+
+#include <libkern/types.h>
+#include <time/time_manager.h>
+
+void arm64_timer_rearm();
+void arm64_timer_install();
+
+#endif // _KERNEL_DRIVERS_TIMER_ARM_ARM64_TIMER_H

kernel/include/drivers/timer/arm/sp804.h

@@ -0,0 +1,34 @@
+#ifndef _KERNEL_DRIVERS_TIMER_ARM_SP804_H
+#define _KERNEL_DRIVERS_TIMER_ARM_SP804_H
+
+#include <drivers/driver_manager.h>
+#include <libkern/mask.h>
+#include <libkern/types.h>
+#include <time/time_manager.h>
+
+#define SP804_CLK_HZ 1000000
+
+// https://developer.arm.com/documentation/ddi0271/d/programmer-s-model/register-descriptions/control-register--timerxcontrol?lang=en
+enum SP804ControlMasks {
+    MASKDEFINE(SP804_ONE_SHOT, 0, 1),
+    MASKDEFINE(SP804_32_BIT, 1, 1),
+    MASKDEFINE(SP804_PRESCALE, 2, 2),
+    MASKDEFINE(SP804_INTS_ENABLED, 5, 1),
+    MASKDEFINE(SP804_PERIODIC, 6, 1),
+    MASKDEFINE(SP804_ENABLE, 7, 1),
+};
+
+struct sp804_registers {
+    uint32_t load;
+    uint32_t value;
+    uint32_t control;
+    uint32_t intclr;
+    uint32_t ris;
+    uint32_t mis;
+    uint32_t bg_load;
+};
+typedef struct sp804_registers sp804_registers_t;
+
+void sp804_install();
+
+#endif //_KERNEL_DRIVERS_TIMER_ARM_SP804_H

kernel/include/drivers/timer/x86/pit.h

@@ -0,0 +1,11 @@
+#ifndef _KERNEL_DRIVERS_TIMER_X86_PIT_H
+#define _KERNEL_DRIVERS_TIMER_X86_PIT_H
+
+#include <libkern/types.h>
+#include <time/time_manager.h>
+
+#define PIT_BASE_FREQ 1193180
+
+void pit_setup();
+
+#endif /* _KERNEL_DRIVERS_TIMER_X86_PIT_H */