Basic debugger support over serial

sys/SConscript

@@ -11,6 +11,7 @@ src_amd64 = [
     "amd64/multiboot.S",
     "amd64/mbentry.c",
     # AMD64
+    "amd64/debug.c",
     "amd64/trap.c",
     "amd64/trapentry.S",
     "amd64/machine.c",

sys/amd64/debug.c

@@ -3,7 +3,7 @@
 
 #include <kassert.h>
 #include <kconfig.h>
-//#include <kdebug.h>
+#include <kdebug.h>
 #include <mp.h>
 
 #include "trap.h"

sys/dev/console.c

@@ -29,9 +29,31 @@ Console_LateInit()
     Serial_LateInit();
 }
 
-void
-Console_Getc(char ch)
+char
+Console_Getc()
 {
+    return Serial_Getc();
+}
+
+void
+Console_Gets(char *str, size_t n)
+{
+    int i;
+
+    for (i = 0; i < (n - 1); i++)
+    {
+	char ch = Console_Getc();
+	if (ch == '\r')
+	{
+	    Console_Putc('\n');
+	    str[i] = '\0';
+	    return;
+	}
+	Console_Putc(ch);
+	str[i] = ch;
+    }
+
+    str[i+1] = '\0';
 }
 
 void

sys/dev/console.h

@@ -3,6 +3,8 @@
 #define __CONSOLE_H__
 
 void Console_Init();
+char Console_Getc();
+void Console_Gets(char *str, size_t n);
 void Console_Putc(char ch);
 void Console_Puts(const char *str);
 

sys/include/kdebug.h

@@ -0,0 +1,13 @@
+
+#ifndef __KDEBUG_H__
+#define __KDEBUG_H__
+
+// Platform Functions
+void Debug_Registers(int argc, const char *argv[]);
+
+// Generic Functions
+void Debug_Dump(int argc, const char *argv[]);
+void Debug_Prompt();
+
+#endif /* __KDEBUG_H__ */
+

sys/kern/debug.c

@@ -18,6 +18,9 @@
 #include <stdint.h>
 
 #include <kassert.h>
+#include <kdebug.h>
+
+#include "../dev/console.h"
 
 void
 Debug_PrintHex(const char *data, size_t length, off_t off, size_t limit)
@@ -75,16 +78,23 @@ Debug_Dump(int argc, const char *argv[])
 {
 }
 
+#define DEBUG_MAX_LINE		128
+
 void
 Debug_Prompt()
 {
+    char buf[DEBUG_MAX_LINE];
     kprintf("Entered Debugger!\n");
 
+    while (1) {
 	kprintf("> ");
+
 	// read input
+	Console_Gets(&buf, DEBUG_MAX_LINE);
 
 	// parse input
 
 	// execute command
+    }
 }