feat/kernel: Broadcast PIT to all CPUs

kernel/src/arch/smp.c

@@ -10,12 +10,21 @@
 #include <mm/heap.h>
 #include <arch/io.h>
 #include <sys/apic/lapic.h>
+#include <sys/apic/ioapic.h>
 #include <sys/acpi/madt.h>
 #include <arch/paging.h>
 #include <util/align.h>
 #include <mm/pmm.h>
 #include <arch/gdt.h>
 #include <arch/idt.h>
+#include <dev/pit.h>
+#include <sys/acpi.h>
+
+void tick(struct register_ctx *)
+{
+    log_early("tick on CPU %d", get_cpu_local()->cpu_index);
+    lapic_eoi();
+}
 
 #define MSR_GS_BASE 0xC0000101
 
@@ -91,6 +100,13 @@ void smp_init(void)
     log_early("%u CPUs detected", cpu_count);
 
     lapic_enable();
+
+    /* Setup IOAPIC */
+    ioapic_init();
+
+    /* Setup timer */
+    pit_init(tick);
+
     tss_init(kstack_top);
 
     for (uint32_t i = 0; i < cpu_count; i++)

kernel/src/dev/pit.c

@@ -29,6 +29,5 @@ void pit_init(idt_intr_handler handler)
     outb(0x40, (divisor >> 8) & 0xFF);
 
     idt_register_handler(PIT_VECTOR, pit_handler);
-    ioapic_map(0, PIT_VECTOR, 0, get_cpu_local()->lapic_id);
+    ioapic_map(0, PIT_VECTOR, 0, 0xFF); /* Broadcast to ALL CPUs */
-    ioapic_unmask(0);
 }

kernel/src/emk.c

@@ -68,11 +68,6 @@ struct limine_mp_response *mp_response = NULL;
 struct flanterm_context *ft_ctx = NULL;
 #endif // FLANTERM_SUPPORT
 
-void tick(struct register_ctx *)
-{
-    log_early("tick on CPU %d", get_cpu_local()->cpu_index);
-}
-
 void emk_entry(void)
 {
     __asm__ volatile("movq %%rsp, %0" : "=r"(kstack_top));
@@ -207,16 +202,11 @@ void emk_entry(void)
     lapic_init();
     smp_init();
 
-    /* Setup IOAPIC */
-    ioapic_init();
-
-    /* Setup timer */
-    pit_init(tick);
-
     /* Finished */
     log_early("%s", LOG_SEPARATOR);
     log_early("Finished initializing EMK v1.0, took ? seconds"); /* Still not running in usermode, so keep using log_early */
 
+    ioapic_unmask(0); // start the timer
     __asm__ volatile("sti");
     hlt();
 }

kernel/src/user/sched.h

@@ -0,0 +1,5 @@
+/* EMK 1.0 Copyright (c) 2025 Piraterna */
+#ifndef SCHED_H
+#define SCHED_H
+
+#endif // SCHED_H