LibBareMetal: Add support for kernel log stream

Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/dc01a71fac2
Pull-request: https://github.com/SerenityOS/serenity/pull/1322

Libraries/LibBareMetal/Output/kprintf.cpp

@@ -96,7 +96,7 @@ static void serial_putch(char ch)
         was_cr = false;
 }
 
-static void console_putch(char*&, char ch)
+static void console_out(char ch)
 {
     if (serial_debug)
         serial_putch(ch);
@@ -110,6 +110,11 @@ static void console_putch(char*&, char ch)
     }
 }
 
+static void console_putch(char*&, char ch)
+{
+    console_out(ch);
+}
+
 int kprintf(const char* fmt, ...)
 {
     color_on();
@@ -155,6 +160,13 @@ extern "C" int dbgputstr(const char* characters, int length)
     return 0;
 }
 
+extern "C" int kernelputstr(const char* characters, int length)
+{
+    for (int i = 0; i < length; ++i)
+        console_out(characters[i]);
+    return 0;
+}
+
 extern "C" int dbgprintf(const char* fmt, ...)
 {
     color_on();

Libraries/LibBareMetal/Output/kstdio.h

@@ -31,6 +31,7 @@
 extern "C" {
 int dbgprintf(const char* fmt, ...);
 int dbgputstr(const char*, int);
+int kernelputstr(const char*, int);
 int kprintf(const char* fmt, ...);
 int sprintf(char* buf, const char* fmt, ...);
 void set_serial_debug(bool on_or_off);