/*
 * \brief  CPU state
 * \author Norman Feske
 * \author Stefan Kalkowski
 * \author Martin Stein
 * \date   2011-05-06
 */

/*
 * Copyright (C) 2011-2012 Genode Labs GmbH
 *
 * This file is part of the Genode OS framework, which is distributed
 * under the terms of the GNU General Public License version 2.
 */

#ifndef _INCLUDE__ARM__CPU__CPU_STATE_H_
#define _INCLUDE__ARM__CPU__CPU_STATE_H_

/* Genode includes */
#include <base/stdint.h>

namespace Genode {

	/**
	 * Basic CPU state
	 */
	struct Cpu_state
	{
		/**
		 * Native exception types
		 */
		enum Cpu_exception {
			RESET                  = 1,
			UNDEFINED_INSTRUCTION  = 2,
			SUPERVISOR_CALL        = 3,
			PREFETCH_ABORT         = 4,
			DATA_ABORT             = 5,
			INTERRUPT_REQUEST      = 6,
			FAST_INTERRUPT_REQUEST = 7,
		};

		/**
		 * Registers
		 */
		addr_t r0, r1, r2, r3, r4, r5, r6,
		       r7, r8, r9, r10, r11, r12; /* general purpose register 0..12 */
		addr_t sp;                        /* stack pointer */
		addr_t lr;                        /* link register */
		addr_t ip;                        /* instruction pointer */
		addr_t cpsr;                      /* current program status register */
		addr_t cpu_exception;             /* last hardware exception */
	};

	/**
	 * Extend CPU state by banked registers
	 */
	struct Cpu_state_modes : Cpu_state
	{
		/**
		 * Common banked registers for exception modes
		 */
		struct Mode_state {

			enum Mode {
				UND,   /* Undefined      */
				SVC,   /* Supervisor     */
				ABORT, /* Abort          */
				IRQ,   /* Interrupt      */
				FIQ,   /* Fast Interrupt */
				MAX
			};

			addr_t spsr; /* saved program status register */
			addr_t sp;   /* banked stack pointer */
			addr_t lr;   /* banked link register */
		};

		Mode_state mode[Mode_state::MAX]; /* exception mode registers   */
		addr_t     fiq_r[5];              /* fast-interrupt mode r8-r12 */
	};
}

#endif /* _INCLUDE__ARM__CPU__CPU_STATE_H_ */