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/* $OpenBSD: asm_macro.h,v 1.19 2001/12/22 17:43:14 smurph Exp $ */
/*
* Mach Operating System
* Copyright (c) 1993-1991 Carnegie Mellon University
* Copyright (c) 1991 OMRON Corporation
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON AND OMRON ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON AND OMRON DISCLAIM ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#ifndef __MACHINE_M88K_ASM_MACRO_H__
#define __MACHINE_M88K_ASM_MACRO_H__
#include <machine/asm.h>
/*
* Various compiler macros used for speed and efficiency.
* Anyone can include.
*/
/*
* Flushes the data pipeline.
*/
static __inline__ void flush_pipeline(void)
{
__asm__ __volatile__ (FLUSH_PIPELINE_STRING);
}
#define db_flush_pipeline flush_pipeline
/*
* PSR_TYPE is the type of the Process Status Register.
*/
typedef unsigned long m88k_psr_type;
/*
* disable_interrupts_return_psr()
*
* The INTERRUPT_DISABLE bit is set in the PSR and the *PREVIOUS*
* PSR is returned. Intended to be used with set_psr() [below] as in:
*
* {
* m88k_psr_type psr;
* .
* .
* psr = disable_interrupts_return_psr();
* .
* SHORT [time-wise] CRITICAL SECTION HERE
* .
* set_psr(psr);
* .
* .
*/
static __inline__ m88k_psr_type disable_interrupts_return_psr(void)
{
m88k_psr_type temp, oldpsr;
__asm__ __volatile__ ("ldcr %0, cr1" : "=r" (oldpsr));
__asm__ __volatile__ ("set %1, %0, 1<1>" : "=r" (oldpsr), "=r" (temp));
__asm__ __volatile__ ("stcr %0, cr1" : "=r" (temp));
__asm__ __volatile__ (FLUSH_PIPELINE_STRING);
return oldpsr;
}
#define disable_interrupt() (void)disable_interrupts_return_psr()
/*
* Sets the PSR. See comments above.
*/
static __inline__ void set_psr(m88k_psr_type psr)
{
__asm__ __volatile__ ("stcr %0, cr1" :: "r" (psr));
__asm__ __volatile__ (FLUSH_PIPELINE_STRING);
}
/*
* Gets the PSR. See comments above.
*/
static __inline__ m88k_psr_type get_psr(void)
{
m88k_psr_type psr;
__asm__ __volatile__ ("ldcr %0, cr1" : "=r" (psr));
return psr;
}
/*
* Enables interrupts.
*/
static __inline__ m88k_psr_type enable_interrupts_return_psr(void)
{
m88k_psr_type temp, oldpsr; /* need a temporary register */
__asm__ __volatile__ ("ldcr %0, cr1" : "=r" (oldpsr));
__asm__ __volatile__ ("clr %1, %0, 1<1>" : "=r" (oldpsr), "=r" (temp));
__asm__ __volatile__ ("stcr %0, cr1" : "=r" (temp));
__asm__ __volatile__ (FLUSH_PIPELINE_STRING);
return oldpsr;
}
#define enable_interrupt() (void)enable_interrupts_return_psr()
#define db_enable_interrupt enable_interrupt
#define db_disable_interrupt disable_interrupt
/*
* Gets the current stack pointer.
*/
static __inline__ unsigned long stack_pointer(void)
{
register unsigned long sp;
__asm__ __volatile__ ("or %0,r0,r31" : "=r" (sp));
return sp;
}
/*
* Provide access from C code to the assembly instruction ff1
*/
static __inline__ unsigned ff1(register unsigned val)
{
__asm__ __volatile__ ("ff1 %0, %0" : "=r" (val) : "0" (val));
return val;
}
#endif /* __MACHINE_M88K_ASM_MACRO_H__ */
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