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Get local APIC timer ready to run

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This commit is contained in:
Josh Holtrop 2022-12-07 23:13:51 -05:00
parent 5799f94efe
commit 9b52ae58e8
1 changed files with 17 additions and 3 deletions
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20
src/hulk/apic.d
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@ -9,6 +9,8 @@ import hulk.acpi;
struct apic
{
private enum uint PERIODIC_MODE = 0x2_0000u;
static struct ApicRegister
{
public uint value;
@ -49,10 +51,11 @@ struct apic
ApicRegister divide_configuration;
}
private static __gshared ApicRegisters * apic_registers;
public static void initialize()
{
ApicRegisters * apic_registers =
cast(ApicRegisters *)acpi.apic_address;
apic_registers = cast(ApicRegisters *)acpi.apic_address;
hurl.map(cast(ulong)apic_registers, cast(ulong)apic_registers,
PT_WRITABLE | PT_WRITE_THROUGH | PT_DISABLE_CACHE | PT_NO_EXECUTE);
klog.writefln("LAPIC ID: 0x%08x", apic_registers.lapic_id.value);
@ -60,8 +63,19 @@ struct apic
/* Enable local APIC to receive interrupts and set spurious interrupt
* vector to 0xFF. */
apic_registers.spurious_interrupt_vector.value = 0x1FFu;
apic_registers.lvt_timer.value = 0x70u;
apic_registers.lvt_timer.value = 0x70u | PERIODIC_MODE;
apic_registers.lvt_lint[0].value = 0x71u;
apic_registers.lvt_lint[1].value = 0x72u;
apic_registers.divide_configuration.value = 3u;
}
private static void eoi()
{
apic_registers.eoi.value = 0u;
}
public static void isr()
{
eoi();
}
}