remove explicit framebuffer in kernel. reduce locking in syscalls

2 files changed, 30 insertions, 0 deletions

diff --git a/arch/x86_64/debug/debug.c b/arch/x86_64/debug/debug.c
new file mode 100644
index 0000000..5b2c918
--- /dev/null
+++ b/arch/x86_64/debug/debug.c
@@ -0,0 +1,10 @@
+#include "debug/debug.h"
+#include "arch/x86_64/hal/serial_com.h"
+
+void _debug_init_arch(void)
+{
+    #ifdef DEBUG_SERIAL
+    _debug_has_output = true;
+    serial_com_init();
+    #endif
+}
diff --git a/arch/x86_64/debug/printf.c b/arch/x86_64/debug/printf.c
new file mode 100644
index 0000000..13737b9
--- /dev/null
+++ b/arch/x86_64/debug/printf.c
@@ -0,0 +1,20 @@
+#include "lib/printf.h"
+#include "../hal/serial_com.h"
+#include "api/error.h"
+#include "debug/debug.h"
+
+int
+kvprintf(const char *fmt, va_list ap)
+{
+    if(!_debug_has_output) return -EBADCALL;
+
+    char buffer[256] = { 0 };
+    int r = vsnprintf(buffer, 256, fmt, ap);
+    int wlen = (r > 256 ? 256 : r);
+
+#ifdef DEBUG_SERIAL
+    serial_com_write(SERIAL_COM1, buffer, wlen);
+#endif
+
+    return r;
+}