cpu_insn.h

epson usb2.0 控制芯片 S1R72V05 固件程序。

/*
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 *  conditions (1) ~ (4) below, or the conditions described in Version 2
 *  of of the GNU Public License officially announced by the Free Software
 *  Foundation, consents to the use, reproduction, alteration, and
 *  redistribution (hereafter called utilization) of this software (this
 *  software includes alterations, likewise below) without compensation.
 *
 *  (1) When this software is utilized in the form of source code, the
 *  above copyright declaration, these conditions of utilization, and the
 *  following stipulation of no guarantee shall be included in unchanged
 *  form inside the source code.
 *  (2) When this software is redistributed in a form in which it can be
 *  used in the development of other software, library form, etc., the above
 *  copyright display, these terms of utilization, and the following
 *  stipulation of no guarantee shall be inserted in documentation accompanying
 *  redistribution (user's manual, etc.).
 *  (3) When this software is redistributed in a form in which it cannot be used
 *  in the development of other software, embedded in devices, etc., one of the
 *  following conditions shall be satisfied.
 *		(a) The above copyright display, these terms of utilization, and the
 *		following stipulation of no guarantee shall be inserted in documentation
 *		accompanying redistribution (user's manual, etc.).
 *		(b) The TOPPERS Project shall be notified owing to a method in which the
 *		form of distribution is decided otherwise.
 *		(4) The above copyright holder and the TOPPERS Project shall be exempt
 *		from responsibility for whatever damages occur either directly or indirectly
 *		through the utilization of this software.
 *
 *	This software is something that is provided with no guarantee. The above copyright
 *  holder and the TOPPERS Project make no guarantee whatsoever in regard to this
 *  software, including the possibility of its application. In addition, the above
 *  copyright holder and the TOPPERS Project shall also not bear responsibility for
 *  whatever damages occur either directly or indirectly through the utilization of
 *  this software.
 *
 *  @(#) $Id: cpu_insn.h,v 1.2 2006/07/21 09:50:00 9564907 Exp $
 */

/*
 * Define the in-line function of special instruction of processor(for ARMv4)
 */

#ifndef	_CPU_INSN_H_
#define	_CPU_INSN_H_

#include <armv4.h>

/*
 * Operation function of the control register
 */

/*
 * Read the present value of status register (CPSR)
 */
Inline UW
current_sr(void)
{
    UW	sr;
    Asm("mrs  %0,CPSR" : "=r"(sr));
    return(sr);
}


/*
 * Change the present value of status register (CPSR)
 */
Inline void
set_sr(UW sr)
{
    Asm("msr CPSR, %0" : : "r"(sr) );
}


/*
 * Diable the IRQ interrupt
 */
Inline void
disint(void)
{
    set_sr(current_sr() | CPSR_IRQ_BIT);
}


/*
 * Enable the IRQ interrupt
 */
Inline void
enaint()
{
    set_sr(current_sr() & ~CPSR_IRQ_BIT);
}


#endif /* _CPU_INSN_H_ */