A update

drivers/ps2_keyboard.c

@@ -0,0 +1,98 @@
+#include <stdio.h>
+#include <port_io.h>
+
+#include <drivers/ps2_keyboard.h>
+
+
+/*
+PS/2 Controller IO Ports
+
+The PS/2 Controller itself uses 2 IO ports (IO ports 0x60 and 0x64). Like many IO ports, reads and writes may access different internal registers.
+
+Historical note: The PC-XT PPI had used port 0x61 to reset the keyboard interrupt request signal (among other unrelated functions). Port 0x61 has no keyboard related functions on AT and PS/2 compatibles.
+IO Port  Access Type  Purpose
+0x60 	 Read/Write   Data Port
+0x64 	 Read 	     Status Register
+0x64 	 Write 	     Command Register
+*/
+
+#define PS2_DATA_PORT   0x60
+#define PS2_STATUS_PORT 0x64
+
+#define KEYBOARD_IRQ    33
+
+/*extern void register_interrupt_handler(int irq, void (*handler)(void));*/
+
+static const char scancode_map[128] = {
+    0,  27, '1','2','3','4','5','6','7','8','9','0','-','=','\b', /* Backspace */
+    '\t', /* Tab */
+    'q','w','e','r','t','y','u','i','o','p','[',']','\n', /* Enter */
+    0, /* Control */
+    'a','s','d','f','g','h','j','k','l',';','\'','`',
+    0, /* Left shift */
+    '\\','z','x','c','v','b','n','m',',','.','/',
+    0, /* Right shift */
+    '*',
+    0, /* Alt */
+    ' ', /* Spacebar */
+    0, /* Caps lock */
+    /* The rest are function and control keys */
+};
+
+static bool shift_pressed = false;
+
+void keyboard_handler(isr_stack_t* regs)
+{
+  (void)regs; /* Only here to dismiss the "Unused parameter" warnings */
+  printd("PS/2 Keyboard handler fired!\n");
+
+  uint8_t scancode = inb(PS2_DATA_PORT);
+
+  /* Handle shift press/release */
+  if (scancode == 0x2A || scancode == 0x36)
+  {
+    shift_pressed = true;
+    return;
+  }
+  else if (scancode == 0xAA || scancode == 0xB6)
+  {
+    shift_pressed = false;
+    return;
+  }
+
+  if (scancode & 0x80)
+  {
+    /* Key release event, ignore for now */
+  }
+  else
+  {
+    char c = scancode_map[scancode];
+    if (shift_pressed && c >= 'a' && c <= 'z') 
+    {
+      c -= 32; /* Convert to uppercase */
+    }
+
+    if (c)
+    {
+      /* Do something with the keypress (e.g., print or buffer) */
+      printf("Char: %c", c);
+    }
+  }
+  
+  outb(0x20, 0x20); /* Acknowledge PIC */
+}
+
+void test_handler(isr_stack_t* r) {
+    printf("IRQ1 fired!\n");
+}
+
+
+void keyboard_init(void)
+{
+  outb(0x21, inb(0x21) & ~0x02);
+  
+  register_interrupt_handler(KEYBOARD_IRQ, test_handler);
+
+  /* Enable keyboard (controller-specific, often optional if already working) */
+  //outb(0x64, 0xAE);
+}