rmode: add real mode related files ...

... and move _long_to_real() with a long_to_real() wrapper there

Signed-off-by: Pawel Wieczorkiewicz <[email protected]>

arch/x86/real_mode_func.c

@@ -0,0 +1,36 @@
+/*
+ * Copyright © 2020 Amazon.com, Inc. or its affiliates.
+ * All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <console.h>
+#include <ktf.h>
+#include <lib.h>
+
+extern void _long_to_real(void);
+
+/* FIXME: add real mode calling functionality */
+void long_to_real(void) {
+    dprintk("%s: Before call\n", __func__);
+    _long_to_real();
+    dprintk("%s: After call\n", __func__);
+}

common/kernel.c

@@ -34,8 +34,6 @@
 #include <perfmon/pfmlib.h>
 #endif
 
-extern void _long_to_real(void);
-
 extern int usermode_call_asm(user_func_t fn, void *fn_arg, unsigned long ret2kern_sp,
                              unsigned long user_stack);
 
@@ -61,14 +59,10 @@ void __naked kernel_main(void) {
     display_memory_map();
     display_multiboot_mmap();
 
-    if (opt_debug) {
-        _long_to_real();
-        printk("\n After long_to_real\n");
-    }
-
 #ifdef KTF_PMU
     pfm_initialize();
 #endif
+
     test_main();
 
     printk("All tasks done.\n");

include/arch/x86/real_mode.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright © 2020 Amazon.com, Inc. or its affiliates.
+ * All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef KTF_REAL_MODE_H
+#define KTF_REAL_MODE_H
+
+#ifndef __ASSEMBLY__
+
+extern void long_to_real(void);
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* KTF_REAL_MODE_H */

tests/test.c

@@ -24,6 +24,7 @@
  */
 #include <console.h>
 #include <ktf.h>
+#include <real_mode.h>
 #include <sched.h>
 
 #ifdef KTF_UNIT_TEST
@@ -136,6 +137,9 @@ static int ktf_unit_tests(void) {
     cpu_freq_expect("Prototyp Amazing Foo One @ 1GHz", 1000000000);
     cpu_freq_expect("Prototyp Amazing Foo Two @ 1.00GHz", 1000000000);
 
+    printk("Long mode to real mode transition:\n");
+    long_to_real();
+
     return 0;
 }
 #else