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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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8
src/kernel/scheduler.cpp
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@@ -13,8 +13,8 @@
#include "kutil/assert.h"
scheduler scheduler::s_instance(nullptr);
static const uint32_t quantum = 2000000;
//static const uint32_t quantum = 20000000;
static const uint64_t quantum_micros = 1000000;
//static const uint32_t quantum_micros = 20000000;
const int stack_size = 0x1000;
const uint64_t rflags_noint = 0x002;
@@ -174,7 +174,7 @@ void
scheduler::start()
{
log::info(logs::task, "Starting scheduler.");
m_apic->enable_timer(isr::isrTimer, 128, quantum, false);
m_tick_count = m_apic->enable_timer(isr::isrTimer, quantum_micros, false);
}
void scheduler::prune(uint64_t now)
@@ -274,7 +274,7 @@ scheduler::tick(addr_t rsp0)
// TODO: action based on the task using the whole quantum
rsp0 = schedule(rsp0);
m_apic->reset_timer(quantum);
m_apic->reset_timer(m_tick_count);
return rsp0;
}