Add serial loggingHEADtrunkdev

1 files changed, 44 insertions, 0 deletions

diff --git a/kernel/amd64/io/com1.cxx b/kernel/amd64/io/com1.cxx
new file mode 100644
index 0000000..fc67b65
--- /dev/null
+++ b/kernel/amd64/io/com1.cxx
@@ -0,0 +1,44 @@
+#include <amd64/io/com1.h>
+#include <amd64/io/ports.h>
+#include <utils.h>
+
+#define COM1 0x3f8
+
+int is_transmit_empty ()
+{
+    return hos::io::inb(COM1 + 5) & 0x20;
+}
+
+namespace hos::io
+{
+    com_logger::com_logger (enum log_level level)
+        : logger (level)
+    {
+        outb(COM1 + 1, 0x00);
+        outb(COM1 + 3, 0x80);
+        outb(COM1 + 0, 0x03);
+        outb(COM1 + 1, 0x00);
+        outb(COM1 + 3, 0x03);
+        outb(COM1 + 2, 0xc7);
+        outb(COM1 + 4, 0x0b);
+        outb(COM1 + 4, 0x1e);
+        outb(COM1 + 0, 0xae);
+
+        if (inb(COM1 + 0) != 0xae)
+        {
+            return;
+        }
+
+        outb(COM1 + 4, 0x0f);
+    }
+
+    void com_logger::flush ()
+    {
+        std::size_t len = strlen(this->buffer);
+        for (std::size_t i = 0; i < len; i++)
+        {
+            while (is_transmit_empty() == 0);
+            outb(COM1 + 0, this->buffer[i]);
+        }
+    }
+}