[SMP] SMP synchronization and scheduling

kernel/include/cpu.h

@@ -20,6 +20,7 @@
 #include <gdt.h>
 #include <process.h>
 #include <thread.h>
+#include <scheduler.h>
 
 typedef struct cpu_t
 {
@@ -51,6 +52,7 @@ void ap_init(cpu_t *cpu);
 
 void trampoline();
 void trampoline_GDT();
+
 #endif
 
 

kernel/include/debug.h

@@ -1,9 +1,10 @@
 #pragma once
 #include <string.h>
 #include <int.h>
+#include <sync.h>
 
 #ifndef NDEBUG
-  #define debug(...) debug_printf(__VA_ARGS__)
+  #define debug(...) ({spin_lock(&debug_lock);debug_printf(__VA_ARGS__);spin_unlock(&debug_lock);})
 #else
   #define debug(...) ((void)0)
 #endif
@@ -12,6 +13,8 @@
 #define debug_warning(...) do{debug("[WARNING] ");debug(__VA_ARGS__);}while(0)
 #define debug_error(...) do{debug("[ERROR] ");debug(__VA_ARGS__);}while(0)
 
+extern lock_t debug_lock;
+
 void debug_init();
 void debug_putch(char c);
 void debug_putsn(char *s, size_t n);

kernel/include/process.h

@@ -4,12 +4,14 @@ typedef struct process_st process_t;
 #include <thread.h>
 #include <mem.h>
 #include <cpu.h>
+#include <sync.h>
 
 typedef struct process_st
 {
   uint64_t pid;
   uint64_t state;
   uint64_t status;
+  lock_t lock;
   struct process_st *parent;
   page_table *P4;
   LIST(struct process_st, children);

kernel/include/sync.h

@@ -0,0 +1,6 @@
+#pragma once
+
+typedef uint64_t lock_t;
+
+void spin_lock(lock_t *lock);
+void spin_unlock(lock_t *lock);