/*
 * Copyright (c) 2007 Michal Kebrt
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup arm32	
 * @{
 */
/** @file
 *  @brief Thread context.
 */

#ifndef KERN_arm32_CONTEXT_H_
#define KERN_arm32_CONTEXT_H_

#include <align.h>
#include <arch/stack.h>

/* Put one item onto the stack to support get_stack_base() and align it up. */
#define SP_DELTA  (0 + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT))

#define context_set(c, _pc, stack, size) \
	do { \
		(c)->pc = (uintptr_t) (_pc); \
		(c)->sp = ((uintptr_t) (stack)) + (size) - SP_DELTA; \
		(c)->fp = 0; \
	} while (0)

#ifndef __ASM__

#include <typedefs.h>

/** Thread context containing registers that must be preserved across function
 * calls.
 */
typedef struct {
	uint32_t cpu_mode;
	uintptr_t sp;
	uintptr_t pc;
	
	uint32_t r4;
	uint32_t r5;
	uint32_t r6;
	uint32_t r7;
	uint32_t r8;
	uint32_t r9;
	uint32_t r10;
	uint32_t fp;	/* r11 */
	
	ipl_t ipl;
} context_t;


#endif /* __ASM__ */

#endif

/** @}
 */