A update

kernel/intro_anim.c

@@ -0,0 +1,72 @@
+#include <string.h>
+#include <tty.h>
+#include <stdio.h>
+#include <port_io.h>
+
+#include <kernel/intro_anim.h>
+
+void delay_us(uint32_t microseconds, uint32_t cpu_mhz) {
+    uint32_t count = cpu_mhz * microseconds;
+    while (count--) {
+        asm volatile ("nop" ::: "memory");
+    }
+}
+
+
+int16_t begin_anim(const char* version)
+{
+  if (strlen(version) < 5)
+  {
+      return -1;
+  }
+
+  const char* e = "Espresso";
+  const char* v = version;
+  const char* n = "Press any key to continue";
+
+  int32_t pos = 0;
+  int32_t v_pos = 0;
+  int16_t b = 0;
+  int32_t sh_pos = VGA_WIDTH / 2;
+  int32_t sv_pos = VGA_HEIGHT / 2;
+
+  while (true)
+  {
+    terminal_clear();
+    
+    for (int32_t i = 0; n[i]; ++i)
+    {
+      terminal_putentryat(n[i], terminal_getcolor(), sh_pos, sv_pos);
+      sh_pos++;
+    }
+
+    for (int32_t i = 0; e[i]; ++i)
+    {
+      terminal_putentryat(e[i], terminal_getcolor(), pos + i, v_pos);
+    }
+
+    if ((v_pos + 1) == VGA_HEIGHT)
+    {
+      v_pos = 0;
+      b = 1;
+    }
+
+    for (int32_t i = 0; v[i]; ++i)
+    {
+      terminal_putentryat(v[i], terminal_getcolor(), pos + i + 3, (b == 0 ? (v_pos + 1) : v_pos));
+    }
+
+    pos += 2;
+    v_pos++;
+    sh_pos = VGA_WIDTH / 2;
+    
+    b = 0;
+
+    delay_us(50000, 5000);
+  }
+
+  terminal_clear();
+
+  return 0;
+}
+