1 files changed, 78 insertions, 0 deletions
diff --git a/src/loader/gui.c b/src/loader/gui.c
new file mode 100644
index 0000000..6ae35e6
--- /dev/null
+++ b/src/loader/gui.c
@@ -0,0 +1,78 @@
+// MIT License, Copyright (c) 2021 Marvin Borner
+// GUI - selection interface
+
+#include <cfg.h>
+#include <cpu.h>
+#include <def.h>
+#include <gui.h>
+#include <int.h>
+#include <log.h>
+#include <pnc.h>
+
+struct {
+	struct cfg_entry *cfg;
+} gui_entries[16] = { 0 };
+
+static u8 gui_entry_add(struct cfg_entry *entry)
+{
+	static u8 index = 0;
+	assert(index + 1 < (u8)sizeof(gui_entries));
+
+	gui_entries[index].cfg = entry;
+
+	index++;
+	return 0;
+}
+
+static u8 gui_entry_exists(u8 entry)
+{
+	return !!gui_entries[entry].cfg;
+}
+
+static void gui_entry_select(u8 entry)
+{
+	if (gui_entry_exists(entry))
+		cfg_exec(gui_entries[entry].cfg);
+	else
+		log("Invalid selection\n");
+}
+
+static void gui_entries_draw(void)
+{
+	for (u8 i = 0; gui_entry_exists(i); i++)
+		vga_log("> '%s' (%s)\n", gui_entries[i].cfg->name, gui_entries[i].cfg->path);
+}
+
+// Using PS2 magic
+static void gui_keyboard_handler(void)
+{
+	static u8 row = 0;
+
+	while (!(inb(0x64) & 1)) // Wait for data (bit 0 gets set)
+		;
+	u8 data = inb(0x60);
+
+	// Reset previous selection
+	vga_put_at('>', 0, row + 2, 0x07);
+
+	if (data == 0x24 && gui_entry_exists(row + 1)) // j/down key
+		row++;
+	else if (data == 0x25 && row > 0) // k/up key
+		row--;
+	else if (data == (0x1c | 0x80)) // enter key release (| 0x80)
+		gui_entry_select(row);
+
+	// Draw selection
+	vga_put_at('#', 0, row + 2, 0x03);
+}
+
+void gui_draw(void)
+{
+	vga_clear();
+	vga_log("SegelBoot by Marvin Borner\n\n");
+
+	cfg_foreach(&gui_entry_add);
+	gui_entries_draw();
+
+	int_event_handler_add(1, &gui_keyboard_handler);
+}