Update VGA cursor position on printk

1 files changed, 43 insertions, 0 deletions

diff --git a/src/ports.h b/src/ports.h
new file mode 100644
index 0000000..0371bcc
--- /dev/null
+++ b/src/ports.h
@@ -0,0 +1,43 @@
+#pragma once
+
+template <typename T>
+concept port_data_t = (is_same<T, uint8_t>::value || is_same<T, uint16_t>::value || is_same<T, uint32_t>::value);
+
+template <uint16_t port_num, port_data_t T>
+class Port {
+public:
+  [[nodiscard]] T read() {
+    T result;
+
+    switch (sizeof(T)) {
+      case 1:
+        asm volatile("inb %1, %0" : "=a"(result) : "Nd"(port_num));
+        break;
+      case 2:
+        asm volatile("inw %1, %0" : "=a"(result) : "Nd"(port_num));
+        break;
+      case 4:
+        asm volatile("inl %1, %0" : "=a"(result) : "Nd"(port_num));
+        break;
+    }
+
+    return result;
+  }
+
+  void write(T data) {
+    switch (sizeof(T)) {
+      case 1:
+        asm volatile("outb %0, %1" : : "a"(data), "Nd"(port_num));
+        break;
+      case 2:
+        asm volatile("outw %0, %1" : : "a"(data), "Nd"(port_num));
+        break;
+      case 4:
+        asm volatile("outl %0, %1" : : "a"(data), "Nd"(port_num));
+        break;
+    }
+  }
+};
+
+typedef Port<0x3d4, uint8_t> vga_horizontal_total;
+typedef Port<0x3d5, uint8_t> vga_horizontal_display_enable_end;