mips.h

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/* SPDX-License-Identifier: BSD-2-Clause */
 
/*
 *  COPYRIGHT (c) 1989-2001.
 *  On-Line Applications Research Corporation (OAR).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef _RTEMS_SCORE_MIPS_H
#define _RTEMS_SCORE_MIPS_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#ifndef ASM
#include <rtems/mips/idtcpu.h>
#endif
 
/*
 *  SR bits that enable/disable interrupts
 *
 *  NOTE: XXX what about SR_ERL?
 */
 
#if (__mips == 3) || (__mips == 32)
#ifdef ASM
#define SR_INTERRUPT_ENABLE_BITS 0x01
#else
#define SR_INTERRUPT_ENABLE_BITS SR_IE
#endif
 
#elif __mips == 1
#define SR_INTERRUPT_ENABLE_BITS SR_IEC
 
#else
#error "mips interrupt enable bits: unknown architecture level!"
#endif
 
/*
 *  This file contains the information required to build
 *  RTEMS for a particular member of the "no cpu"
 *  family when executing in protected mode.  It does
 *  this by setting variables to indicate which implementation
 *  dependent features are present in a particular member
 *  of the family.
 */
 
#if defined(__mips_soft_float)
#define MIPS_HAS_FPU 0
#else
#define MIPS_HAS_FPU 1
#endif
 
 
#if (__mips == 1)
#define CPU_MODEL_NAME  "ISA Level 1 or 2"
#elif (__mips == 3) || (__mips == 32)
#if defined(__mips64)
#define CPU_MODEL_NAME  "ISA Level 4"
#else
#define CPU_MODEL_NAME  "ISA Level 3"
#endif
#else
#error "Unknown MIPS ISA level"
#endif
 
/*
 *  Define the name of the CPU family.
 */
 
#define CPU_NAME "MIPS"
 
/*
 *  RTEMS Vector numbers for exception conditions.  This is a direct
 *  map to the causes.
 */
 
#define MIPS_EXCEPTION_BASE 0
 
#define MIPS_EXCEPTION_INT              MIPS_EXCEPTION_BASE+0
#define MIPS_EXCEPTION_MOD              MIPS_EXCEPTION_BASE+1
#define MIPS_EXCEPTION_TLBL             MIPS_EXCEPTION_BASE+2
#define MIPS_EXCEPTION_TLBS             MIPS_EXCEPTION_BASE+3
#define MIPS_EXCEPTION_ADEL             MIPS_EXCEPTION_BASE+4
#define MIPS_EXCEPTION_ADES             MIPS_EXCEPTION_BASE+5
#define MIPS_EXCEPTION_IBE              MIPS_EXCEPTION_BASE+6
#define MIPS_EXCEPTION_DBE              MIPS_EXCEPTION_BASE+7
#define MIPS_EXCEPTION_SYSCALL          MIPS_EXCEPTION_BASE+8
#define MIPS_EXCEPTION_BREAK            MIPS_EXCEPTION_BASE+9
#define MIPS_EXCEPTION_RI               MIPS_EXCEPTION_BASE+10
#define MIPS_EXCEPTION_CPU              MIPS_EXCEPTION_BASE+11
#define MIPS_EXCEPTION_OVERFLOW         MIPS_EXCEPTION_BASE+12
#define MIPS_EXCEPTION_TRAP             MIPS_EXCEPTION_BASE+13
#define MIPS_EXCEPTION_VCEI             MIPS_EXCEPTION_BASE+14
/* FPE only on mips2 and higher */
#define MIPS_EXCEPTION_FPE              MIPS_EXCEPTION_BASE+15
#define MIPS_EXCEPTION_C2E              MIPS_EXCEPTION_BASE+16
/* 17-22 reserved */
#define MIPS_EXCEPTION_WATCH            MIPS_EXCEPTION_BASE+23
/* 24-30 reserved */
#define MIPS_EXCEPTION_VCED             MIPS_EXCEPTION_BASE+31
 
#define MIPS_INTERRUPT_BASE             MIPS_EXCEPTION_BASE+32
 
/*
 *  Some macros to access registers
 */
 
#define mips_get_sr( _x ) \
  do { \
    __asm__ volatile( "mfc0 %0, $12; nop" : "=r" (_x) : ); \
  } while (0)
 
#define mips_set_sr( _x ) \
  do { \
    unsigned int __x = (_x); \
    __asm__ volatile( "mtc0 %0, $12; nop" : : "r" (__x) ); \
  } while (0)
 
 
/*
 *  Access the Cause register
 */
 
#define mips_get_cause( _x ) \
  do { \
    __asm__ volatile( "mfc0 %0, $13; nop" : "=r" (_x) : ); \
  } while (0)
 
 
#define mips_set_cause( _x ) \
  do { \
    unsigned int __x = (_x); \
    __asm__ volatile( "mtc0 %0, $13; nop" : : "r" (__x) ); \
  } while (0)
 
 
 
 
/*
 *  Access the Debug Cache Invalidate Control register
 */
 
#define mips_get_dcic( _x ) \
  do { \
    __asm__ volatile( "mfc0 %0, $7; nop" : "=r" (_x) : ); \
  } while (0)
 
 
#define mips_set_dcic( _x ) \
  do { \
    unsigned int __x = (_x); \
    __asm__ volatile( "mtc0 %0, $7; nop" : : "r" (__x) ); \
  } while (0)
 
 
 
 
/*
 *  Access the Breakpoint Program Counter & Mask registers
 *  (_x for BPC, _y for mask)
 */
 
#define mips_get_bpcrm( _x, _y ) \
  do { \
    __asm__ volatile( "mfc0 %0, $3; nop" : "=r" (_x) : ); \
    __asm__ volatile( "mfc0 %0, $11; nop" : "=r" (_y) : ); \
  } while (0)
 
 
#define mips_set_bpcrm( _x, _y ) \
  do { \
    unsigned int __x = (_x); \
    unsigned int __y = (_y); \
    __asm__ volatile( "mtc0 %0, $11; nop" : : "r" (__y) ); \
    __asm__ volatile( "mtc0 %0, $3; nop" : : "r" (__x) ); \
  } while (0)
 
 
 
 
 
 
/*
 *  Access the Breakpoint Data Address & Mask registers
 *  (_x for BDA, _y for mask)
 */
 
#define mips_get_bdarm( _x, _y ) \
  do { \
    __asm__ volatile( "mfc0 %0, $5; nop" : "=r" (_x) : ); \
    __asm__ volatile( "mfc0 %0, $9; nop" : "=r" (_y) : ); \
  } while (0)
 
 
#define mips_set_bdarm( _x, _y ) \
  do { \
    unsigned int __x = (_x); \
    unsigned int __y = (_y); \
    __asm__ volatile( "mtc0 %0, $9; nop" : : "r" (__y) ); \
    __asm__ volatile( "mtc0 %0, $5; nop" : : "r" (__x) ); \
  } while (0)
 
 
 
 
 
 
 
/*
 *  Access FCR31
 */
 
#if ( MIPS_HAS_FPU == 1 )
 
#define mips_get_fcr31( _x ) \
  do { \
    __asm__ volatile( "cfc1 %0, $31; nop" : "=r" (_x) : ); \
  } while(0)
 
 
#define mips_set_fcr31( _x ) \
  do { \
    unsigned int __x = (_x); \
    __asm__ volatile( "ctc1 %0, $31; nop" : : "r" (__x) ); \
  } while(0)
 
#else
 
#define mips_get_fcr31( _x )
#define mips_set_fcr31( _x )
 
#endif
 
/*
 *  Manipulate interrupt mask
 *
 *  mips_unmask_interrupt( _mask)
 *    enables interrupts - mask is positioned so it only needs to be or'ed
 *    into the status reg. This also does some other things !!!! Caution
 *    should be used if invoking this while in the middle of a debugging
 *    session where the client may have nested interrupts.
 *
 *  mips_mask_interrupt( _mask )
 *    disable the interrupt - mask is the complement of the bits to be
 *    cleared - i.e. to clear ext int 5 the mask would be - 0xffff7fff
 *
 *
 *  NOTE: mips_mask_interrupt() used to be disable_int().
 *        mips_unmask_interrupt() used to be enable_int().
 *
 */
 
#define mips_enable_in_interrupt_mask( _mask ) \
  do { \
    unsigned int _sr; \
    mips_get_sr( _sr ); \
    _sr |= (_mask); \
    mips_set_sr( _sr ); \
  } while (0)
 
#define mips_disable_in_interrupt_mask( _mask ) \
  do { \
    unsigned int _sr; \
    mips_get_sr( _sr ); \
    _sr &= ~(_mask); \
    mips_set_sr( _sr ); \
  } while (0)
 
#ifdef __cplusplus
}
#endif
 
#endif /* _RTEMS_SCORE_MIPS_H */
/* end of include file */