spr.h

/* SPDX-License-Identifier: GPL-2.0+-with-RTEMS-exception */
 
/*
 *  spr.h -- Access to special purpose registers.
 *
 *  Copyright (C) 1998 Gabriel Paubert, paubert@iram.es
 *
 *  Modified to compile in RTEMS development environment
 *  by Eric Valette
 *
 *  Copyright (c) 1998 Eric Valette <eric.valette@free.fr>
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.org/license/LICENSE.
 *
 */
 
 
#ifndef _LIBCPU_SPR_H
#define _LIBCPU_SPR_H
 
#include <rtems/powerpc/registers.h>
 
#define __MFSPR(reg, val) \
    __asm__ __volatile__("mfspr %0,"#reg : "=r" (val))
 
#define __MTSPR(val, reg) \
    __asm__ __volatile__("mtspr "#reg",%0" : : "r" (val))
 
 
#define SPR_RW(reg) \
static inline unsigned long _read_##reg(void) \
{\
    unsigned long val;\
    __MFSPR(reg, val);\
    return val;\
}\
static inline void _write_##reg(unsigned long val)\
{\
    __MTSPR(val,reg);\
    return;\
}
 
#define SPR_RO(reg) \
static inline unsigned long _read_##reg(void) \
{\
    unsigned long val;\
    __MFSPR(reg,val);\
    return val;\
}
 
static inline unsigned long _read_MSR(void)
{
    unsigned long val;
    __asm__ volatile("mfmsr %0" : "=r" (val));
    return val;
}
 
static inline void _write_MSR(unsigned long val)
{
    __asm__ volatile("mtmsr %0" : : "r" (val));
    return;
}
 
static inline unsigned long _read_SR(void * va)
{
    unsigned long val;
    __asm__ volatile (
        ".machine \"push\"\n"
        ".machine \"any\"\n"
        "mfsrin %0,%1\n"
        ".machine \"pop\"" :
        "=r" (val) :
        "r" (va)
    );
    return val;
}
 
static inline void _write_SR(unsigned long val, void * va)
{
    __asm__ volatile (
        ".machine \"push\"\n"
        ".machine \"any\"\n"
        "mtsrin %0,%1\n"
        ".machine \"pop\"" : :
        "r" (val) , "r" (va) :
        "memory"
    );
    return;
}
 
 
#endif