1 files changed, 94 insertions, 0 deletions
diff --git a/cpu/amd/geode_lx/gplvsa_ii/vsm_lib/virtual.asm b/cpu/amd/geode_lx/gplvsa_ii/vsm_lib/virtual.asm
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index 0000000..56d3585
--- /dev/null
+++ b/cpu/amd/geode_lx/gplvsa_ii/vsm_lib/virtual.asm
@@ -0,0 +1,94 @@
+; 
+; Copyright (c) 2006-2008 Advanced Micro Devices,Inc. ("AMD").
+; 
+; This library is free software; you can redistribute it and/or modify
+; it under the terms of the GNU Lesser General Public License as
+; published by the Free Software Foundation; either version 2.1 of the
+; License, or (at your option) any later version.
+; 
+; This code is distributed in the hope that it will be useful,
+; but WITHOUT ANY WARRANTY; without even the implied warranty of
+; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+; Lesser General Public License for more details.
+; 
+; You should have received a copy of the GNU Lesser General
+; Public License along with this library; if not, write to the
+; Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+; Boston, MA 02111-1307 USA 
+; 
+;*   Function:                                                         *
+;*     This file contains the virtual register library functions.
+
+include sysmgr.inc
+include vsa2.inc
+
+.model tiny,c
+.586p
+.CODE
+
+
+
+
+externdef sys_system_call:proc
+
+
+
+
+;***********************************************************************
+; IMPLEMENTATION NOTE:
+;
+; Using a system call for virtual register access by a VSM has
+; advantages over performing I/O:
+;
+; 1) There is no dependency on VIRTUAL_BASE. It can be changed
+;    without requiring recompilation of the VSM.
+;
+; 2) Better performance.  There is only one SMI for a system call
+;    versus two for I/O (index & data).
+;
+; 3) It solves the problem of atomic accesses to index/data pairs.      
+;
+;***********************************************************************
+
+
+;***********************************************************************
+; void sys_set_virtual_register(USHORT Index, USHORT Data)
+;***********************************************************************
+
+sys_set_virtual_register proc pascal \
+	VR_Index:WORD, \
+	VR_Data: WORD
+
+	mov	bx, VR_Index
+	mov	cx, VR_Data
+	mov	ax, SYS_CODE_SET_VIRTUAL
+	call	sys_system_call
+
+	ret
+
+sys_set_virtual_register endp
+
+
+
+
+;***********************************************************************
+; USHORT sys_get_virtual_register(USHORT Index)
+;***********************************************************************
+sys_get_virtual_register proc pascal  \
+	VR_Index:word
+
+	mov	bx, VR_Index
+	mov	ax, SYS_CODE_GET_VIRTUAL
+	call	sys_system_call
+
+	ret
+
+sys_get_virtual_register endp
+
+
+
+
+
+
+	END 
+