/******************************************************************************
 * hypercall.h
 * 
 * Copyright (c) 2002-2006, K A Fraser
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation; or, when distributed
 * separately from the Linux kernel or incorporated into other
 * software packages, subject to the following license:
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this source file (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef __HVMLOADER_HYPERCALL_H__
#define __HVMLOADER_HYPERCALL_H__

#include <stdint.h>
#include <xen/xen.h>
#include "config.h"

#define __STR(...) #__VA_ARGS__
#define STR(...) __STR(__VA_ARGS__)

/*
 * NB. Hypercall address needs to be relative to a linkage symbol for
 * some version of ld to relocate the relative calls properly.
 */
#define hypercall_pa "_start - " STR(HYPERCALL_PHYSICAL_ADDRESS)

#define _hypercall0(type, name)						\
({									\
	long __res;							\
	asm volatile (							\
		"call "hypercall_pa" + " STR(__HYPERVISOR_##name * 32)	\
		: "=a" (__res)						\
		:							\
		: "memory" );						\
	(type)__res;							\
})

#define _hypercall1(type, name, a1)					\
({									\
	long __res, __ign1;						\
	asm volatile (							\
		"call "hypercall_pa" + " STR(__HYPERVISOR_##name * 32)	\
		: "=a" (__res), "=b" (__ign1)				\
		: "1" ((long)(a1))					\
		: "memory" );						\
	(type)__res;							\
})

#define _hypercall2(type, name, a1, a2)					\
({									\
	long __res, __ign1, __ign2;					\
	asm volatile (							\
		"call "hypercall_pa" + " STR(__HYPERVISOR_##name * 32)	\
		: "=a" (__res), "=b" (__ign1), "=c" (__ign2)		\
		: "1" ((long)(a1)), "2" ((long)(a2))			\
		: "memory" );						\
	(type)__res;							\
})

#define _hypercall3(type, name, a1, a2, a3)				\
({									\
	long __res, __ign1, __ign2, __ign3;				\
	asm volatile (							\
		"call "hypercall_pa" + " STR(__HYPERVISOR_##name * 32)	\
		: "=a" (__res), "=b" (__ign1), "=c" (__ign2),		\
		"=d" (__ign3)						\
		: "1" ((long)(a1)), "2" ((long)(a2)),			\
		"3" ((long)(a3))					\
		: "memory" );						\
	(type)__res;							\
})

#define _hypercall4(type, name, a1, a2, a3, a4)				\
({									\
	long __res, __ign1, __ign2, __ign3, __ign4;			\
	asm volatile (							\
		"call "hypercall_pa" + " STR(__HYPERVISOR_##name * 32)	\
		: "=a" (__res), "=b" (__ign1), "=c" (__ign2),		\
		"=d" (__ign3), "=S" (__ign4)				\
		: "1" ((long)(a1)), "2" ((long)(a2)),			\
		"3" ((long)(a3)), "4" ((long)(a4))			\
		: "memory" );						\
	(type)__res;							\
})

#define _hypercall5(type, name, a1, a2, a3, a4, a5)			\
({									\
	long __res, __ign1, __ign2, __ign3, __ign4, __ign5;		\
	asm volatile (							\
		"call "hypercall_pa" + " STR(__HYPERVISOR_##name * 32)	\
		: "=a" (__res), "=b" (__ign1), "=c" (__ign2),		\
		"=d" (__ign3), "=S" (__ign4), "=D" (__ign5)		\
		: "1" ((long)(a1)), "2" ((long)(a2)),			\
		"3" ((long)(a3)), "4" ((long)(a4)),			\
		"5" ((long)(a5))					\
		: "memory" );						\
	(type)__res;							\
})

static inline int
hypercall_sched_op(
	int cmd, void *arg)
{
	return _hypercall2(int, sched_op, cmd, arg);
}

static inline int
hypercall_memory_op(
	unsigned int cmd, void *arg)
{
	return _hypercall2(int, memory_op, cmd, arg);
}

static inline int
hypercall_multicall(
	void *call_list, int nr_calls)
{
	return _hypercall2(int, multicall, call_list, nr_calls);
}

static inline int
hypercall_event_channel_op(
	int cmd, void *arg)
{
	return _hypercall2(int, event_channel_op, cmd, arg);
}

static inline int
hypercall_xen_version(
	int cmd, void *arg)
{
	return _hypercall2(int, xen_version, cmd, arg);
}

static inline int
hypercall_console_io(
	int cmd, int count, char *str)
{
	return _hypercall3(int, console_io, cmd, count, str);
}

static inline int
hypercall_vm_assist(
	unsigned int cmd, unsigned int type)
{
	return _hypercall2(int, vm_assist, cmd, type);
}

static inline int
hypercall_vcpu_op(
	int cmd, int vcpuid, void *extra_args)
{
	return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
}

static inline int
hypercall_hvm_op(
	int cmd, void *arg)
{
	return _hypercall2(int, hvm_op, cmd, arg);
}

#endif /* __HVMLOADER_HYPERCALL_H__ */
