kernel: Add RSOD(red screen of death)

This is not useful since 99% of the time I will have access to the
serial output. But it does look cool.

1 files changed, 37 insertions, 0 deletions

diff --git a/kernel/log.c b/kernel/log.c
index 47f6d6f..11ac783 100644
--- a/kernel/log.c
+++ b/kernel/log.c
@@ -1,13 +1,50 @@
 #include "log.h"
 #include <cpu/arch_inst.h>
+#include <drivers/serial.h>
+#include <drivers/vbe.h>
+#include <fonts.h>
 #include <sched/scheduler.h>
 #include <stdarg.h>
 
+int log_to_screen = 0;
+
+extern u8 *framebuffer;
+extern u32 framebuffer_width;
+extern u32 framebuffer_height;
+
+void log_enable_screen(void) {
+  log_to_screen = 1;
+  u32 *p = (u32 *)framebuffer;
+  for (u32 i = 0; i < framebuffer_width * framebuffer_height; i++, p++) {
+    *p = 0xFF0000;
+  }
+}
+
 struct stackframe {
   struct stackframe *ebp;
   u32 eip;
 };
 
+u32 x = 0;
+u32 y = 0;
+
+void log_char(const char c) {
+  write_serial(c);
+  if (log_to_screen) {
+    if ('\n' == c) {
+      x = 0;
+      y += 8;
+      return;
+    }
+    if (x > 1000) {
+      y += 8;
+      x = 0;
+    }
+    vbe_drawfont(x, y, c);
+    x += 8;
+  }
+}
+
 void dump_backtrace(u32 max_frames) {
   struct stackframe *stk = (void *)get_current_sbp();
   kprintf("Stack trace:\n");