/*
 * Copyright (C) 1999-2017 Paolo Mantegazza <mantegazza@aero.polimi.it>
 * extensions for user space modules are jointly copyrighted (2000) with:
 *		Pierre Cloutier <pcloutier@poseidoncontrols.com>,
 *		Steve Papacharalambous <stevep@zentropix.com>.
 *
 * 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 of the License, or (at your option) any later version.
 *
 * This library 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.
 */

#ifndef _RTAI_ASM_X86_64_LXRT_H
#define _RTAI_ASM_X86_64_LXRT_H

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#ifdef __KERNEL__

#define RT_REG_ORIG_AX           orig_ax
#define RT_REG_SP                sp
#define RT_REG_SS                ss
#define RT_REG_FLAGS             flags
#define RT_REG_IP                ip
#define RT_REG_CS                cs
#define RT_REG_BP                bp
#define RT_REG_BX                bx
#define RT_REG_CX                cx

#define RTAI_SYSCALL_CODE     di
#define RTAI_SYSCALL_ARGS     si
#define RTAI_SYSCALL_RETPNT   dx

#define LINUX_SYSCALL_NR      RT_REG_ORIG_AX
#define LINUX_SYSCALL_REG1    di
#define LINUX_SYSCALL_REG2    si
#define LINUX_SYSCALL_REG3    dx
#define LINUX_SYSCALL_REG4    r10
#define LINUX_SYSCALL_REG5    r8
#define LINUX_SYSCALL_REG6    r9
#define LINUX_SYSCALL_RETREG  ax
#define LINUX_SYSCALL_FLAGS   RT_REG_FLAGS

#ifdef CONFIG_RTAI_USE_STACK_ARGS // WHY THIS DOES NOT WORK ANYWAY-MORE???

/*
 *  From Linux lib/usercopy.c.
 */

#define __do_strncpy_from_user(dst, src, count, res)			   \
do {									   \
	long __d0, __d1, __d2;						   \
	__asm__ __volatile__(						   \
		"	testq %1,%1\n"					   \
		"	jz 2f\n"					   \
		"0:	lodsb\n"					   \
		"	stosb\n"					   \
		"	testb %%al,%%al\n"				   \
		"	jz 1f\n"					   \
		"	decq %1\n"					   \
		"	jnz 0b\n"					   \
		"1:	subq %1,%0\n"					   \
		"2:\n"							   \
		".section .fixup,\"ax\"\n"				   \
		"3:	movq %5,%0\n"					   \
		"	jmp 2b\n"					   \
		".previous\n"						   \
		".section __ex_table,\"a\"\n"				   \
		"	.align 8\n"					   \
		"	.quad 0b,3b\n"					   \
		".previous"						   \
		: "=&r"(res), "=&c"(count), "=&a" (__d0), "=&S" (__d1),	   \
		  "=&D" (__d2)						   \
		: "i"(-EFAULT), "0"(count), "1"(count), "3"(src), "4"(dst) \
		: "memory");						   \
} while (0)

#endif

#endif /* __KERNEL__ */

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* !_RTAI_ASM_X86_64_LXRT_H */