/* 
 * Copyright 2010 Stefan Lankes, Chair for Operating Systems,
 *                               RWTH Aachen University
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * This file is part of MetalSVM.
 *
 */

#ifndef __ARCH_TASKS__
#define __ARCH_TASKS__

#include <metalsvm/stddef.h>
#include <metalsvm/tasks_types.h>

#ifdef __cplusplus
extern "C" {
#endif

int arch_fork(task_t* task);
int create_default_frame(task_t* task, entry_point_t ep, void* arg);
int register_task(task_t* task);
void reschedule(void);

static inline int jump_to_user_code(uint32_t ep, uint32_t stack)
{
	asm volatile ("mov %0, %%ds; mov %0, %%fs; mov %0, %%gs; mov %0, %%es" :: "r"(0x23));
	asm volatile ("push $0x23; push %0; push $0x1B; push %1" :: "r"(stack), "r"(ep));
	asm volatile ("lret");

	return 0;
}

#ifdef __cplusplus
}
#endif

#endif