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src/keyboard.c

@@ -0,0 +1,80 @@
+#include "print.h"
+#include <stdbool.h>
+#include <stdint.h>
+
+#define KEYBOARD_DATA_PORT 0x60
+#define KEYBOARD_STATUS_PORT 0x64
+
+static char scancode_to_ascii[] = { 0,    0,   '1', '2', '3', '4', '5', '6', '7', '8', '9',  '0', '-', '=',  '\b',
+                                    '\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p',  '[', ']', '\n', 0,
+                                    'a',  's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`', 0,   '\\', 'z',
+                                    'x',  'c', 'v', 'b', 'n', 'm', ',', '.', '/', 0,   '*',  0,   ' ' };
+
+static char input_buffer[256];
+static int buffer_index = 0;
+static bool key_available = false;
+
+static uint8_t inb(uint16_t port)
+{
+    uint8_t result;
+    __asm__ volatile("inb %1, %0" : "=a"(result) : "Nd"(port));
+    return result;
+}
+
+void keyboard_handler(void)
+{
+    uint8_t scancode = inb(KEYBOARD_DATA_PORT);
+
+    if (scancode & 0x80)
+    {
+        return;
+    }
+
+    if (scancode < sizeof(scancode_to_ascii))
+    {
+        char ascii = scancode_to_ascii[scancode];
+        if (ascii)
+        {
+            if (ascii == '\b')
+            {
+                if (buffer_index > 0)
+                {
+                    buffer_index--;
+                    print("\b \b");
+                }
+            }
+            else if (ascii == '\n')
+            {
+                input_buffer[buffer_index] = '\0';
+                print("\n");
+                key_available = true;
+            }
+            else if (buffer_index < 255)
+            {
+                input_buffer[buffer_index++] = ascii;
+                char str[2] = { ascii, '\0' };
+                print(str);
+            }
+        }
+    }
+}
+
+char* keyboard_get_line(void)
+{
+    buffer_index = 0;
+    key_available = false;
+
+    while (!key_available)
+    {
+        __asm__ volatile("hlt");
+    }
+
+    return input_buffer;
+}
+
+void keyboard_init(void)
+{
+    __asm__ volatile("sti");
+    print_clr("[success]", FG_GREEN, BG_BLACK);
+    print(" keyboard initialized\n");
+}