Build cleanup and implemented support for qemu debug logging

sys/SConscript

@@ -19,14 +19,16 @@ src_amd64 = [
     "amd64/lapic.c",
     "amd64/ioapic.c",
     "dev/x86/vgacons.c",
-    "dev/ahci.c",
+    "dev/x86/debugcons.c",
-    "dev/pci.c",
 ]
 
 src_common = [
     "kern/libc.c",
     "kern/palloc.c",
     "kern/printf.c",
+    "dev/ahci.c",
+    "dev/console.c",
+    "dev/pci.c",
 ]
 
 if (env["ARCH"] == "amd64"):

sys/dev/console.c

@@ -0,0 +1,28 @@
+
+#include <stdint.h>
+
+#include "console.h"
+#include "x86/vgacons.h"
+#include "x86/debugcons.h"
+
+void
+Console_Init()
+{
+    VGA_Init();
+    DebugConsole_Init();
+}
+
+void
+Console_Putc(char ch)
+{
+    VGA_Putc(ch);
+    DebugConsole_Putc(ch);
+}
+
+void
+Console_Puts(const char *str)
+{
+    VGA_Puts(str);
+    DebugConsole_Puts(str);
+}
+

sys/dev/console.h

@@ -2,13 +2,9 @@
 #ifndef __CONSOLE_H__
 #define __CONSOLE_H__
 
-#include "x86/vgacons.h"
+void Console_Init();
-
+void Console_Putc(char ch);
-// Placeholder until a proper console driver is made
+void Console_Puts(const char *str);
-
-#define Console_Init    VGA_Init
-#define Console_Putc    VGA_Putc
-#define Console_Puts    VGA_Puts
 
 #endif /* __CONSOLE_H__ */
 

sys/dev/x86/debugcons.c

@@ -0,0 +1,28 @@
+
+/*
+ * Debug Console for QEmu compatible port 0xe9
+ */
+
+#include <stdint.h>
+
+#include <cdefs.h>
+
+#include "../../amd64/amd64.h"
+#include "../../amd64/amd64op.h"
+
+void DebugConsole_Init()
+{
+}
+
+void DebugConsole_Putc(short c)
+{
+    outb(0xe9, (uint8_t)c);
+}
+
+void DebugConsole_Puts(const char *str)
+{
+    const char *p = str;
+    while (*p != '\0')
+        DebugConsole_Putc(*p++);
+}
+

sys/dev/x86/debugcons.h

@@ -0,0 +1,9 @@
+#ifndef __DEBUGCONS_H__
+#define __DEBUGCONS_H__
+
+void DebugConsole_Init(void);
+void DebugConsole_Putc(char ch);
+void DebugConsole_Puts(const char *str);
+
+#endif /* __DEBUGCONS_H__ */
+