Add functions "pic_enable" and "pic_disable"

arch/hwint.c

@@ -52,4 +52,6 @@ void hwint_register_handler(unsigned int int_no, hwint_handler_t handler)
     }
 
     handlers[int_no] = handler;
+
+    pic_enable(int_no);
 }

arch/pic.c

@@ -10,6 +10,7 @@
 #define SLAVE_DATA    0xA1
 
 #define IRQS_COUNT 8
+#define IRQS_TOTAL 16
 
 static unsigned char master_irq_start = 0;
 static unsigned char slave_irq_start  = 8;
@@ -30,6 +31,45 @@ void pic_disable_all()
     outportb(SLAVE_DATA,  0xFF);
 }
 
+void pic_enable(const unsigned char line)
+{
+    if (line >= IRQS_TOTAL) {
+        logger_warn_from("pic", "Invalid line %u.", line);
+        return;
+    }
+
+    logger_info_from("pic", "Enable line %u.", line);
+
+    if (line < IRQS_COUNT) {
+        const unsigned char mask = inportb(MASTER_DATA);
+        outportb(MASTER_DATA, mask & ~(1 << line));
+    }
+    else {
+        const unsigned char mask = inportb(SLAVE_DATA);
+        outportb(SLAVE_DATA, mask & ~(1 << (line - IRQS_COUNT)));
+    }
+}
+
+void pic_disable(const unsigned char line)
+{
+    if (line >= IRQS_TOTAL) {
+        logger_warn_from("pic", "Invalid line %u.", line);
+        return;
+    }
+
+    logger_info_from("pic", "Disable line %u.", line);
+
+    if (line < IRQS_COUNT) {
+        const unsigned char mask = inportb(MASTER_DATA);
+        outportb(MASTER_DATA, mask | (1 << line));
+    }
+    else {
+        const unsigned char mask = inportb(SLAVE_DATA);
+        outportb(SLAVE_DATA, mask | (1 << (line - IRQS_COUNT)));
+    }
+}
+
+
 void pic_remap(const unsigned char new_master_irq_start, const unsigned char new_slave_irq_start)
 {
     logger_info_from("pic", "Remap the IRQ table.");

arch/pic.h

@@ -6,6 +6,9 @@ void pic_remap(unsigned char master_irq_start, unsigned char slave_irq_start);
 void pic_enable_all();
 void pic_disable_all();
 
+void pic_enable(unsigned char line);
+void pic_disable(unsigned char line);
+
 unsigned char pic_end_of_interrupt(unsigned char irq);
 
 #endif

arch/protected.c

@@ -54,7 +54,7 @@ void idt_flush(const struct IdtPointer *pointer);
 void protected_initialize(const struct KernelMQ_Info *const kinfo)
 {
     pic_remap(32, 40);
-    pic_enable_all();
+    pic_disable_all();
 
     logger_info_from("protected", "Setup GDT.");