feat: initial locking etc.

kernel/libk/syscall.c

@@ -30,3 +30,7 @@ void syscall_yield_job() {
 void syscall_yield_irq(uint16_t irq) {
     syscall2(SYSCALL_YIELD_IRQ, irq );
 }
+
+void syscall_job_suspend() {
+    syscall1(SYSCALL_SUSPEND);
+}

kernel/libk/syscall.h

@@ -10,6 +10,7 @@
 #define SYSCALL_START_SCHEDULER 0x01
 #define SYSCALL_YIELD_JOB       0x02
 #define SYSCALL_YIELD_IRQ       0x03
+#define SYSCALL_SUSPEND         0x04
 
 void noreturn syscall_start_scheduler();
 
@@ -17,4 +18,6 @@ void syscall_yield_job();
 
 void syscall_yield_irq(uint16_t irq);
 
+void syscall_job_suspend();
+
 #endif //NEW_KERNEL_SYSCALL_H