kernel: add standard clock system

arch/x86_64/acpi/apic.cpp

@@ -1,4 +1,5 @@
 #include <socks/printk.h>
+#include <socks/clock.h>
 #include <socks/vm.h>
 #include <socks/cpu.h>
 #include <arch/acpi/io_apic.hpp>
@@ -16,6 +17,7 @@
 #define IA32_APIC_BASE_MSR_ENABLE 0x800
 
 static int apic_enabled = 0;
+static unsigned int bsp_id = (unsigned int)-1;
 
 using namespace arch::acpi;
 
@@ -118,12 +120,26 @@ static void ioapic_init(uintptr_t base, unsigned int int_base)
 	queue_push_back(&io_apics, &apic->io_entry);
 }
 
+static int lapic_clock_irq(void)
+{
+	if (this_cpu() == bsp_id) {
+		clock_advance(1);
+	}
+
+	return 0;
+}
+
+static struct irq_hook lapic_clock_irq_hook = {
+	{},
+	lapic_clock_irq,
+};
+
 void local_apic_config_timer(void)
 {
 	local_apic lapic(lapic_base);
 	lapic.write(local_apic::TIMER_DIV, 0x3);
 	lapic.write(local_apic::TIMER_INITCOUNT, (uint32_t)-1);
-	pit_wait(100);
+	clock_wait(10);
 	lapic.write(local_apic::LVT_TIMER, APIC_LVT_INT_MASKED);
 
 	/* mask IRQ0 to block interrupts from the PIT. */
@@ -132,7 +148,8 @@ void local_apic_config_timer(void)
 
 	uint32_t total_ticks = 0xFFFFFFFF - lapic.read(local_apic::TIMER_CURCOUNT);
 
-	total_ticks /= 100;
+	/* convert to LAPIC ticks per kernel clock tick */
+	total_ticks /= 10;
 
 	lapic.write(local_apic::LVT_TIMER, IRQ0 | APIC_LVT_TIMER_MODE_PERIODIC);
 	lapic.write(local_apic::TIMER_DIV, 0x3);
@@ -189,8 +206,6 @@ static void init_all_ioapic(struct acpi_madt *madt)
 
 kern_status_t apic_init(void)
 {
-	static unsigned int bsp_id = (unsigned int)-1;
-
 	/* the bootstrap processor will be the first one ro call apic_init().
 	   it is responsible for initialising the I/O APICs */
 	if (bsp_id == (unsigned int)-1) {
@@ -214,8 +229,13 @@ kern_status_t apic_init(void)
 	apic_enabled = 1;
 	irq_enable();
 
-	pit_start(1000);
+	pit_start(HZ);
+	return KERN_OK;
+
 	local_apic_config_timer();
+	pit_stop();
+
+	hook_irq(IRQ0, &lapic_clock_irq_hook);
 
 	return KERN_OK;
 }