kernel: add c++ support

arch/x86_64/include/socks/machine/cpu.h

@@ -4,6 +4,10 @@
 #include <arch/gdt.h>
 #include <arch/irq.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define ml_cpu_block_get_id(p) ((p)->c_cpu_id)
 
 typedef struct ml_cpu_block {
@@ -28,4 +32,8 @@ extern int ml_cpu_block_use(ml_cpu_block *p);
 extern void ml_halt_cpu(void);
 extern ml_cpu_block *ml_this_cpu(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/socks/machine/hwlock.h

@@ -3,6 +3,10 @@
 
 #define ML_HWLOCK_INIT (0)
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef int ml_hwlock_t;
 
 extern void ml_hwlock_lock(ml_hwlock_t *lck);
@@ -11,4 +15,8 @@ extern void ml_hwlock_unlock(ml_hwlock_t *lck);
 extern void ml_hwlock_lock_irqsave(ml_hwlock_t *lck, unsigned long *flags);
 extern void ml_hwlock_unlock_irqrestore(ml_hwlock_t *lck, unsigned long flags);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

arch/x86_64/include/socks/machine/init.h

@@ -3,6 +3,10 @@
 
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define __X2(x) #x
 #define __X(x) __X2(x)
 
@@ -12,4 +16,8 @@
 
 extern int ml_init(uintptr_t arg);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif