Add keyboard driver

1 files changed, 21 insertions, 3 deletions

diff --git a/src/idt.cc b/src/idt.cc
index fefe53e..68ae260 100644
--- a/src/idt.cc
+++ b/src/idt.cc
@@ -4,7 +4,23 @@
 #include "ports.h"
 
 static_assert(sizeof(IDT::Pointer) == 6);
-static_assert(sizeof(IDT::Entry) == 8);  // size of IDT::Entry in protected mode is 64 bits
+
+static InterruptHandler* handlers[256] = {nullptr};
+
+bool IDT::install(uint8_t irq, InterruptHandler* h) {
+  if (h != nullptr && handlers[irq] == nullptr) {
+    handlers[irq] = h;
+    return true;
+  }
+  return false;
+}
+bool IDT::uninstall(uint8_t irq, InterruptHandler* h) {
+  if (handlers[irq] == h) {
+    handlers[irq] = nullptr;
+    return true;
+  }
+  return false;
+}
 
 /* reinitialize the PIC controllers, giving them specified vector offsets
    rather than 8h and 70h, as configured by default */
@@ -22,7 +38,10 @@ static_assert(sizeof(IDT::Entry) == 8);  // size of IDT::Entry in protected mode
 #define ICW4_SFNM 0x10       /* Special fully nested (not) */
 
 extern "C" uint32_t handle_interrupt(uint8_t irq, uint32_t esp) {
-  printk("interrupt ", uhex{irq}, '\n');
+  if (handlers[irq] != nullptr) {
+    handlers[irq]->trigger();
+  }
+
   pic1_t pic1;
   pic1.write(0x20);
   if (irq > 7) {
@@ -91,7 +110,6 @@ IDT::IDT(const uint16_t selector) {
 
   Pointer ptr{.limit = sizeof(table), .base = reinterpret_cast<uint32_t>(table)};
   asm volatile("lidt %0" : : "m"(ptr));
-  asm volatile("sti");
 
   printk("IDT installed at ", uhex{ptr.base}, '\n');
 }