Initial commit

kernel/drivers/keyboard.c

@@ -0,0 +1,70 @@
+//
+// Created by rick on 23-03-20.
+//
+#include "keyboard.h"
+
+#include <kprint.h>
+#include <drivers/ports.h>
+#include <cpu/isr.h>
+#include <libc/libc.h>
+
+char scancodes_ascii[] = {
+        0, 0,
+        '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 0,
+        0, 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', 0,
+        0, 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`',
+        0, '\\', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', 0,
+        '*',
+        0, ' ',
+        0,
+        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // F1-F10
+        0, 0,
+        '7', '8', '9', '-',
+        '4', '5', '6', '+',
+        '1', '2', '3',
+        '0', 0,
+        0, // sysrq
+        0, 0, // weird
+        0, 0, // F11 F12
+        // weid
+};
+
+char *MSG_KEY = "Clicked on key 'x'\n";
+
+void print_scancode(unsigned char scancode);
+
+static void keyboard_callback(registers_t regs) {
+    unsigned char status = port_byte_in(PORT_PS2_STATUS);
+    // check if data available
+    if ((status & 0b00000001) == 0) {
+        return;
+    }
+    unsigned char scancode = port_byte_in(0x60);
+    print_scancode(scancode);
+}
+
+void init_keyboard() {
+    register_interrupt_handler(IRQ1, keyboard_callback);
+}
+
+void print_scancode(unsigned char scancode) {
+    char msg[256];
+    char release = 0;
+    if (scancode > 0x80) {
+        // release
+        release = 1;
+        scancode -= 0x80;
+    }
+    char code = scancodes_ascii[scancode];
+    if (code == 0) {
+        // special
+    } else {
+        if (release && code > 0x60 && code < 0x7B) {
+            code -= 0x20; // to lowercase
+        }
+
+        memcpy(msg, MSG_KEY, strlen(MSG_KEY));
+        msg[strlen(msg) - 3] = code;
+        kprint(msg);
+    }
+}