SMP and timer interrupts

kernel/amd64/smp.h

@@ -0,0 +1,32 @@
+#ifndef _KERNEL_AMD64_SMP_H
+#define _KERNEL_AMD64_SMP_H
+
+#include <amd64/gdt.h>
+#include <amd64/tss.h>
+#include <aux/compiler.h>
+#include <libk/std.h>
+
+#define CPUS_MAX 32
+
+struct cpu {
+  uint64_t lapic_ticks;
+  uint32_t id;
+  struct {
+    uint64_t rflags;
+    atomic_int nesting;
+  } irq_ctx;
+  volatile uint8_t kernel_stack[KSTACK_SIZE] ALIGNED (16);
+  volatile uint8_t except_stack[KSTACK_SIZE] ALIGNED (16);
+  volatile uint8_t irq_stack[KSTACK_SIZE] ALIGNED (16);
+  volatile struct gdt_extended gdt ALIGNED (16);
+  volatile struct tss tss;
+};
+
+struct cpu* cpu_make (void);
+struct cpu* cpu_get (uint32_t id);
+void cpu_assign (uint32_t id);
+uint32_t cpu_id (void);
+
+#define thiscpu (cpu_get (cpu_id ()))
+
+#endif // _KERNEL_AMD64_SMP_H