Add x86_64 task switching (to be updated to new-style scheduler).

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@450 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/kern/switch_x86_64.s b/kern/switch_x86_64.s
new file mode 100755 (executable)
index 0000000..60a31e2
--- /dev/null
+++ b/kern/switch_x86_64.s
@@ -0,0 +1,70 @@
+/*!
+ * \file
+ * <!--
+ * Copyright 2004 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 1999,2000,2001 Bernardo Innocenti <bernie@develer.com>
+ * This file is part of DevLib - See devlib/README for information.
+ * -->
+ *
+ * \brief i386 context switch
+ *
+ * \version $Id$
+ *
+ * \author Bernardo Innocenti <bernie@develer.com>
+ */
+
+/*
+ * $Log$
+ * Revision 1.1  2005/11/27 03:06:15  bernie
+ * Add x86_64 task switching (to be updated to new-style scheduler).
+ *
+ * Revision 1.1  2005/11/14 21:06:38  bernie
+ * Add x86_64 support.
+ *
+ * Revision 1.2  2004/06/06 16:14:12  bernie
+ * Add DevLib license information.
+ *
+ * Revision 1.1  2004/05/23 17:27:00  bernie
+ * Import kern/ subdirectory.
+ *
+ */
+
+!!!!!! THIS FILE HAS NOT BEEN REVISED FOR THE NEW SCHEDULER API !!!!!!
+
+/* I know it's ugly... */
+#.intel_syntax
+
+/* void AsmSwitchContext(void * new_sp, void ** save_sp) */
+.globl AsmSwitchContext
+AsmSwitchContext:
+       pushq   %rax
+       pushq   %rbx
+       pushq   %rcx
+       pushq   %rdx
+       pushq   %rsi
+       pushq   %rdi
+       pushq   %rbp
+       movq    %rsp,(%rsi)             /* *save_sp = rsp */
+       movq    %rdi,%rsp               /* rsp = new_sp */
+       popq    %rbp
+       popq    %rdi
+       popq    %rsi
+       popq    %rdx
+       popq    %rcx
+       popq    %rbx
+       popq    %rax
+       ret
+
+/* void AsmReplaceContext(void * new_sp, void ** dummy) */
+.globl AsmReplaceContext
+AsmReplaceContext:
+       movq    %rdi,%rsp                /* rsp = new_sp */
+       popq    %rbp
+       popq    %rdi
+       popq    %rsi
+       popq    %rdx
+       popq    %rcx
+       popq    %rbx
+       popq    %rax
+       ret
+