/* $OpenBSD: asm_macro.h,v 1.1 2004/04/26 12:34:05 miod 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 /* * Various compiler macros used for speed and efficiency. * Anyone can include. */ /* * Flushes the data pipeline. */ #define flush_pipeline() \ __asm__ __volatile__ (FLUSH_PIPELINE_STRING) /* * 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 /* * Provide access from C code to the assembly instruction ff1 */ static __inline__ unsigned ff1(unsigned val) { __asm__ __volatile__ ("ff1 %0, %0" : "=r" (val) : "0" (val)); return val; } #endif /* __MACHINE_M88K_ASM_MACRO_H__ */