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APIC timer calibration

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Now the APIC timer is calibrated against the PIT, and the interval for
timer_enable takes a number of microseconds instead of raw ticks and a
divisor.
This commit is contained in:
Justin C. Miller
2018-09-16 18:56:01 -07:00
parent 482b9f50fc
commit 5e6769036c
7 changed files with 126 additions and 47 deletions
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14
src/kernel/apic.h
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@@ -32,10 +32,10 @@ public:
/// Enable interrupts for the LAPIC timer.
/// \arg vector Interrupt vector the timer should use
/// \arg divisor The frequency divisor of the bus Hz (power of 2, <= 128)
/// \arg count The count of ticks before an interrupt
/// \arg interval The timer interval, in microseconds
/// \arg repeat If false, this timer is one-off, otherwise repeating
void enable_timer(isr vector, uint8_t divisor, uint32_t count, bool repeat = true);
/// \returns The count of ticks the timer is set for
uint32_t enable_timer(isr vector, uint64_t interval, bool repeat = true);
/// Reset the timer countdown.
/// \arg count The count of ticks before an interrupt, or 0 to stop the timer
@@ -55,6 +55,14 @@ public:
void enable(); ///< Enable servicing of interrupts
void disable(); ///< Disable (temporarily) servicing of interrupts
/// Calibrate the timer speed against the PIT
void calibrate_timer();
private:
uint32_t enable_timer_internal(isr vector, uint8_t divisor, uint32_t count, bool repeat);
uint32_t m_ticks_per_us;
};