FreeBSD/Linux Kernel Cross Reference
sys/arch/mips/include/cpuregs.h

     /*      $NetBSD: cpuregs.h,v 1.65 2003/10/29 23:41:10 simonb Exp $      */
     
     /*
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * Ralph Campbell and Rick Macklem.
      *
     * 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.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     *      @(#)machConst.h 8.1 (Berkeley) 6/10/93
     *
     * machConst.h --
     *
     *      Machine dependent constants.
     *
     *      Copyright (C) 1989 Digital Equipment Corporation.
     *      Permission to use, copy, modify, and distribute this software and
     *      its documentation for any purpose and without fee is hereby granted,
     *      provided that the above copyright notice appears in all copies.
     *      Digital Equipment Corporation makes no representations about the
     *      suitability of this software for any purpose.  It is provided "as is"
     *      without express or implied warranty.
     *
     * from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/machConst.h,
     *      v 9.2 89/10/21 15:55:22 jhh Exp  SPRITE (DECWRL)
     * from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/machAddrs.h,
     *      v 1.2 89/08/15 18:28:21 rab Exp  SPRITE (DECWRL)
     * from: Header: /sprite/src/kernel/vm/ds3100.md/RCS/vmPmaxConst.h,
     *      v 9.1 89/09/18 17:33:00 shirriff Exp  SPRITE (DECWRL)
     */
    
    #ifndef _MIPS_CPUREGS_H_
    #define _MIPS_CPUREGS_H_
    
    #include <sys/cdefs.h>          /* For __CONCAT() */
    
    #if defined(_KERNEL_OPT)
    #include "opt_cputype.h"
    #endif
    
    /*
     * Address space.
     * 32-bit mips CPUS partition their 32-bit address space into four segments:
     *
     * kuseg   0x00000000 - 0x7fffffff  User virtual mem,  mapped
     * kseg0   0x80000000 - 0x9fffffff  Physical memory, cached, unmapped
     * kseg1   0xa0000000 - 0xbfffffff  Physical memory, uncached, unmapped
     * kseg2   0xc0000000 - 0xffffffff  kernel-virtual,  mapped
     *
     * mips1 physical memory is limited to 512Mbytes, which is
     * doubly mapped in kseg0 (cached) and kseg1 (uncached.)
     * Caching of mapped addresses is controlled by bits in the TLB entry.
     */
    
    #define MIPS_KUSEG_START                0x0
    #define MIPS_KSEG0_START                0x80000000
    #define MIPS_KSEG1_START                0xa0000000
    #define MIPS_KSEG2_START                0xc0000000
    #define MIPS_MAX_MEM_ADDR               0xbe000000
    #define MIPS_RESERVED_ADDR              0xbfc80000
    
    #define MIPS_PHYS_MASK                  0x1fffffff
    
    #define MIPS_KSEG0_TO_PHYS(x)   ((unsigned)(x) & MIPS_PHYS_MASK)
    #define MIPS_PHYS_TO_KSEG0(x)   ((unsigned)(x) | MIPS_KSEG0_START)
    #define MIPS_KSEG1_TO_PHYS(x)   ((unsigned)(x) & MIPS_PHYS_MASK)
    #define MIPS_PHYS_TO_KSEG1(x)   ((unsigned)(x) | MIPS_KSEG1_START)
    #define MIPS_KSEG2_TO_PHYS(x)   ((unsigned)(x) & MIPS_PHYS_MASK)
    #define MIPS_PHYS_TO_KSEG2(x)   ((unsigned)(x) | MIPS_KSEG2_START)
    
    /* Map virtual address to index in mips3 r4k virtually-indexed cache */
    #define MIPS3_VA_TO_CINDEX(x) \
                    ((unsigned)(x) & 0xffffff | MIPS_KSEG0_START)
    
    #define MIPS_PHYS_TO_XKPHYS(cca,x) \
           ((0x2ULL << 62) | ((unsigned long long)(cca) << 59) | (x))
   #define MIPS_XKPHYS_TO_PHYS(x)  ((x) & 0x0effffffffffffffULL)
   
   /* CPU dependent mtc0 hazard hook */
   #define COP0_SYNC               /* nothing */
   #define COP0_HAZARD_FPUENABLE   nop; nop; nop; nop;
   
   /*
    * The bits in the cause register.
    *
    * Bits common to r3000 and r4000:
    *
    *      MIPS_CR_BR_DELAY        Exception happened in branch delay slot.
    *      MIPS_CR_COP_ERR         Coprocessor error.
    *      MIPS_CR_IP              Interrupt pending bits defined below.
    *                              (same meaning as in CAUSE register).
    *      MIPS_CR_EXC_CODE        The exception type (see exception codes below).
    *
    * Differences:
    *  r3k has 4 bits of execption type, r4k has 5 bits.
    */
   #define MIPS_CR_BR_DELAY        0x80000000
   #define MIPS_CR_COP_ERR         0x30000000
   #define MIPS1_CR_EXC_CODE       0x0000003C      /* four bits */
   #define MIPS3_CR_EXC_CODE       0x0000007C      /* five bits */
   #define MIPS_CR_IP              0x0000FF00
   #define MIPS_CR_EXC_CODE_SHIFT  2
   
   /*
    * The bits in the status register.  All bits are active when set to 1.
    *
    *      R3000 status register fields:
    *      MIPS_SR_COP_USABILITY   Control the usability of the four coprocessors.
    *      MIPS_SR_TS              TLB shutdown.
    *
    *      MIPS_SR_INT_IE          Master (current) interrupt enable bit.
    *
    * Differences:
    *      r3k has cache control is via frobbing SR register bits, whereas the
    *      r4k cache control is via explicit instructions.
    *      r3k has a 3-entry stack of kernel/user bits, whereas the
    *      r4k has kernel/supervisor/user.
    */
   #define MIPS_SR_COP_USABILITY   0xf0000000
   #define MIPS_SR_COP_0_BIT       0x10000000
   #define MIPS_SR_COP_1_BIT       0x20000000
   
           /* r4k and r3k differences, see below */
   
   #define MIPS_SR_MX              0x01000000      /* MIPS64 */
   #define MIPS_SR_PX              0x00800000      /* MIPS64 */
   #define MIPS_SR_BEV             0x00400000      /* Use boot exception vector */
   #define MIPS_SR_TS              0x00200000
   
           /* r4k and r3k differences, see below */
   
   #define MIPS_SR_INT_IE          0x00000001
   /*#define MIPS_SR_MBZ           0x0f8000c0*/    /* Never used, true for r3k */
   /*#define MIPS_SR_INT_MASK      0x0000ff00*/
   
   
   /*
    * The R2000/R3000-specific status register bit definitions.
    * all bits are active when set to 1.
    *
    *      MIPS_SR_PARITY_ERR      Parity error.
    *      MIPS_SR_CACHE_MISS      Most recent D-cache load resulted in a miss.
    *      MIPS_SR_PARITY_ZERO     Zero replaces outgoing parity bits.
    *      MIPS_SR_SWAP_CACHES     Swap I-cache and D-cache.
    *      MIPS_SR_ISOL_CACHES     Isolate D-cache from main memory.
    *                              Interrupt enable bits defined below.
    *      MIPS_SR_KU_OLD          Old kernel/user mode bit. 1 => user mode.
    *      MIPS_SR_INT_ENA_OLD     Old interrupt enable bit.
    *      MIPS_SR_KU_PREV         Previous kernel/user mode bit. 1 => user mode.
    *      MIPS_SR_INT_ENA_PREV    Previous interrupt enable bit.
    *      MIPS_SR_KU_CUR          Current kernel/user mode bit. 1 => user mode.
    */
   
   #define MIPS1_PARITY_ERR        0x00100000
   #define MIPS1_CACHE_MISS        0x00080000
   #define MIPS1_PARITY_ZERO       0x00040000
   #define MIPS1_SWAP_CACHES       0x00020000
   #define MIPS1_ISOL_CACHES       0x00010000
   
   #define MIPS1_SR_KU_OLD         0x00000020      /* 2nd stacked KU/IE*/
   #define MIPS1_SR_INT_ENA_OLD    0x00000010      /* 2nd stacked KU/IE*/
   #define MIPS1_SR_KU_PREV        0x00000008      /* 1st stacked KU/IE*/
   #define MIPS1_SR_INT_ENA_PREV   0x00000004      /* 1st stacked KU/IE*/
   #define MIPS1_SR_KU_CUR         0x00000002      /* current KU */
   
   /* backwards compatibility */
   #define MIPS_SR_PARITY_ERR      MIPS1_PARITY_ERR
   #define MIPS_SR_CACHE_MISS      MIPS1_CACHE_MISS
   #define MIPS_SR_PARITY_ZERO     MIPS1_PARITY_ZERO
   #define MIPS_SR_SWAP_CACHES     MIPS1_SWAP_CACHES
   #define MIPS_SR_ISOL_CACHES     MIPS1_ISOL_CACHES
   
   #define MIPS_SR_KU_OLD          MIPS1_SR_KU_OLD
   #define MIPS_SR_INT_ENA_OLD     MIPS1_SR_INT_ENA_OLD
   #define MIPS_SR_KU_PREV         MIPS1_SR_KU_PREV
   #define MIPS_SR_KU_CUR          MIPS1_SR_KU_CUR
   #define MIPS_SR_INT_ENA_PREV    MIPS1_SR_INT_ENA_PREV
   
   /*
    * R4000 status register bit definitons,
    * where different from r2000/r3000.
    */
   #define MIPS3_SR_XX             0x80000000
   #define MIPS3_SR_RP             0x08000000
   #define MIPS3_SR_FR             0x04000000
   #define MIPS3_SR_RE             0x02000000
   
   #define MIPS3_SR_DIAG_DL        0x01000000              /* QED 52xx */
   #define MIPS3_SR_DIAG_IL        0x00800000              /* QED 52xx */
   #define MIPS3_SR_SR             0x00100000
   #define MIPS3_SR_EIE            0x00100000              /* TX79/R5900 */
   #define MIPS3_SR_NMI            0x00080000              /* MIPS32/64 */
   #define MIPS3_SR_DIAG_CH        0x00040000
   #define MIPS3_SR_DIAG_CE        0x00020000
   #define MIPS3_SR_DIAG_PE        0x00010000
   #define MIPS3_SR_KX             0x00000080
   #define MIPS3_SR_SX             0x00000040
   #define MIPS3_SR_UX             0x00000020
   #define MIPS3_SR_KSU_MASK       0x00000018
   #define MIPS3_SR_KSU_USER       0x00000010
   #define MIPS3_SR_KSU_SUPER      0x00000008
   #define MIPS3_SR_KSU_KERNEL     0x00000000
   #define MIPS3_SR_ERL            0x00000004
   #define MIPS3_SR_EXL            0x00000002
   
   #ifdef MIPS3_5900
   #undef MIPS_SR_INT_IE
   #define MIPS_SR_INT_IE          0x00010001              /* XXX */
   #endif
   
   #define MIPS_SR_SOFT_RESET      MIPS3_SR_SOFT_RESET
   #define MIPS_SR_DIAG_CH         MIPS3_SR_DIAG_CH
   #define MIPS_SR_DIAG_CE         MIPS3_SR_DIAG_CE
   #define MIPS_SR_DIAG_PE         MIPS3_SR_DIAG_PE
   #define MIPS_SR_KX              MIPS3_SR_KX
   #define MIPS_SR_SX              MIPS3_SR_SX
   #define MIPS_SR_UX              MIPS3_SR_UX
   
   #define MIPS_SR_KSU_MASK        MIPS3_SR_KSU_MASK
   #define MIPS_SR_KSU_USER        MIPS3_SR_KSU_USER
   #define MIPS_SR_KSU_SUPER       MIPS3_SR_KSU_SUPER
   #define MIPS_SR_KSU_KERNEL      MIPS3_SR_KSU_KERNEL
   #define MIPS_SR_ERL             MIPS3_SR_ERL
   #define MIPS_SR_EXL             MIPS3_SR_EXL
   
   
   /*
    * The interrupt masks.
    * If a bit in the mask is 1 then the interrupt is enabled (or pending).
    */
   #define MIPS_INT_MASK           0xff00
   #define MIPS_INT_MASK_5         0x8000
   #define MIPS_INT_MASK_4         0x4000
   #define MIPS_INT_MASK_3         0x2000
   #define MIPS_INT_MASK_2         0x1000
   #define MIPS_INT_MASK_1         0x0800
   #define MIPS_INT_MASK_0         0x0400
   #define MIPS_HARD_INT_MASK      0xfc00
   #define MIPS_SOFT_INT_MASK_1    0x0200
   #define MIPS_SOFT_INT_MASK_0    0x0100
   
   /*
    * mips3 CPUs have on-chip timer at INT_MASK_5.  Each platform can
    * choose to enable this interrupt.
    */
   #if defined(MIPS3_ENABLE_CLOCK_INTR)
   #define MIPS3_INT_MASK                  MIPS_INT_MASK
   #define MIPS3_HARD_INT_MASK             MIPS_HARD_INT_MASK
   #else
   #define MIPS3_INT_MASK                  (MIPS_INT_MASK &  ~MIPS_INT_MASK_5)
   #define MIPS3_HARD_INT_MASK             (MIPS_HARD_INT_MASK & ~MIPS_INT_MASK_5)
   #endif
   
   /*
    * The bits in the context register.
    */
   #define MIPS1_CNTXT_PTE_BASE    0xFFE00000
   #define MIPS1_CNTXT_BAD_VPN     0x001FFFFC
   
   #define MIPS3_CNTXT_PTE_BASE    0xFF800000
   #define MIPS3_CNTXT_BAD_VPN2    0x007FFFF0
   
   /*
    * The bits in the MIPS3 config register.
    *
    *      bit 0..5: R/W, Bit 6..31: R/O
    */
   
   /* kseg0 coherency algorithm - see MIPS3_TLB_ATTR values */
   #define MIPS3_CONFIG_K0_MASK    0x00000007
   
   /*
    * R/W Update on Store Conditional
    *      0: Store Conditional uses coherency algorithm specified by TLB
    *      1: Store Conditional uses cacheable coherent update on write
    */
   #define MIPS3_CONFIG_CU         0x00000008
   
   #define MIPS3_CONFIG_DB         0x00000010      /* Primary D-cache line size */
   #define MIPS3_CONFIG_IB         0x00000020      /* Primary I-cache line size */
   #define MIPS3_CONFIG_CACHE_L1_LSIZE(config, bit) \
           (((config) & (bit)) ? 32 : 16)
   
   #define MIPS3_CONFIG_DC_MASK    0x000001c0      /* Primary D-cache size */
   #define MIPS3_CONFIG_DC_SHIFT   6
   #define MIPS3_CONFIG_IC_MASK    0x00000e00      /* Primary I-cache size */
   #define MIPS3_CONFIG_IC_SHIFT   9
   #define MIPS3_CONFIG_C_DEFBASE  0x1000          /* default base 2^12 */
   #ifdef MIPS3_4100                               /* VR4100 core */
   /* XXXCDC: THIS MIPS3_4100 SPECIAL CASE SHOULD GO AWAY */
   #define MIPS3_CONFIG_CS         0x00001000      /* cache size mode indication*/
   #define MIPS3_CONFIG_CACHE_SIZE(config, mask, dummy, shift) \
           ((((config)&MIPS3_CONFIG_CS)?0x400:0x1000) << (((config) & (mask)) >> (shift)))
   #else
   #define MIPS3_CONFIG_CACHE_SIZE(config, mask, base, shift) \
           ((base) << (((config) & (mask)) >> (shift)))
   #endif
   
   /* External cache enable: Controls L2 for R5000/Rm527x and L3 for Rm7000 */
   #define MIPS3_CONFIG_SE         0x00001000
   
   /* Block ordering: 0: sequential, 1: sub-block */
   #define MIPS3_CONFIG_EB         0x00002000
   
   /* ECC mode - 0: ECC mode, 1: parity mode */
   #define MIPS3_CONFIG_EM         0x00004000
   
   /* BigEndianMem - 0: kernel and memory are little endian, 1: big endian */
   #define MIPS3_CONFIG_BE         0x00008000
   
   /* Dirty Shared coherency state - 0: enabled, 1: disabled */
   #define MIPS3_CONFIG_SM         0x00010000
   
   /* Secondary Cache - 0: present, 1: not present */
   #define MIPS3_CONFIG_SC         0x00020000
   
   /* System Port width - 0: 64-bit, 1: 32-bit (QED RM523x), 2,3: reserved */
   #define MIPS3_CONFIG_EW_MASK    0x000c0000
   #define MIPS3_CONFIG_EW_SHIFT   18
   
   /* Secondary Cache port width - 0: 128-bit data path to S-cache, 1: reserved */
   #define MIPS3_CONFIG_SW         0x00100000
   
   /* Split Secondary Cache Mode - 0: I/D mixed, 1: I/D separated by SCAddr(17) */
   #define MIPS3_CONFIG_SS         0x00200000
   
   /* Secondary Cache line size */
   #define MIPS3_CONFIG_SB_MASK    0x00c00000
   #define MIPS3_CONFIG_SB_SHIFT   22
   #define MIPS3_CONFIG_CACHE_L2_LSIZE(config) \
           (0x10 << (((config) & MIPS3_CONFIG_SB_MASK) >> MIPS3_CONFIG_SB_SHIFT))
   
   /* Write back data rate */
   #define MIPS3_CONFIG_EP_MASK    0x0f000000
   #define MIPS3_CONFIG_EP_SHIFT   24
   
   /* System clock ratio - this value is CPU dependent */
   #define MIPS3_CONFIG_EC_MASK    0x70000000
   #define MIPS3_CONFIG_EC_SHIFT   28
   
   /* Master-Checker Mode - 1: enabled */
   #define MIPS3_CONFIG_CM         0x80000000
   
   /*
    * The bits in the MIPS4 config register.
    */
   
   /* kseg0 coherency algorithm - see MIPS3_TLB_ATTR values */
   #define MIPS4_CONFIG_K0_MASK    MIPS3_CONFIG_K0_MASK
   #define MIPS4_CONFIG_DN_MASK    0x00000018      /* Device number */
   #define MIPS4_CONFIG_CT         0x00000020      /* CohPrcReqTar */
   #define MIPS4_CONFIG_PE         0x00000040      /* PreElmReq */
   #define MIPS4_CONFIG_PM_MASK    0x00000180      /* PreReqMax */
   #define MIPS4_CONFIG_EC_MASK    0x00001e00      /* SysClkDiv */
   #define MIPS4_CONFIG_SB         0x00002000      /* SCBlkSize */
   #define MIPS4_CONFIG_SK         0x00004000      /* SCColEn */
   #define MIPS4_CONFIG_BE         0x00008000      /* MemEnd */
   #define MIPS4_CONFIG_SS_MASK    0x00070000      /* SCSize */
   #define MIPS4_CONFIG_SC_MASK    0x00380000      /* SCClkDiv */
   #define MIPS4_CONFIG_RESERVED   0x03c00000      /* Reserved wired 0 */
   #define MIPS4_CONFIG_DC_MASK    0x1c000000      /* Primary D-Cache size */
   #define MIPS4_CONFIG_IC_MASK    0xe0000000      /* Primary I-Cache size */
   
   #define MIPS4_CONFIG_DC_SHIFT   26
   #define MIPS4_CONFIG_IC_SHIFT   29
   
   #define MIPS4_CONFIG_CACHE_SIZE(config, mask, base, shift)              \
           ((base) << (((config) & (mask)) >> (shift)))
   
   #define MIPS4_CONFIG_CACHE_L2_LSIZE(config)                             \
           (((config) & MIPS4_CONFIG_SB) ? 128 : 64)
   
   /*
    * Location of exception vectors.
    *
    * Common vectors:  reset and UTLB miss.
    */
   #define MIPS_RESET_EXC_VEC      0xBFC00000
   #define MIPS_UTLB_MISS_EXC_VEC  0x80000000
   
   /*
    * MIPS-1 general exception vector (everything else)
    */
   #define MIPS1_GEN_EXC_VEC       0x80000080
   
   /*
    * MIPS-III exception vectors
    */
   #define MIPS3_XTLB_MISS_EXC_VEC 0x80000080
   #define MIPS3_CACHE_ERR_EXC_VEC 0x80000100
   #define MIPS3_GEN_EXC_VEC       0x80000180
   
   /*
    * TX79 (R5900) exception vectors
    */
   #define MIPS_R5900_COUNTER_EXC_VEC              0x80000080
   #define MIPS_R5900_DEBUG_EXC_VEC                0x80000100
   
   /*
    * MIPS32/MIPS64 (and some MIPS3) dedicated interrupt vector.
    */
   #define MIPS3_INTR_EXC_VEC      0x80000200
   
   /*
    * Coprocessor 0 registers:
    *
    *                              v--- width for mips I,III,32,64
    *                                   (3=32bit, 6=64bit, i=impl dep)
    *  0   MIPS_COP_0_TLB_INDEX    3333 TLB Index.
    *  1   MIPS_COP_0_TLB_RANDOM   3333 TLB Random.
    *  2   MIPS_COP_0_TLB_LOW      3... r3k TLB entry low.
    *  2   MIPS_COP_0_TLB_LO0      .636 r4k TLB entry low.
    *  3   MIPS_COP_0_TLB_LO1      .636 r4k TLB entry low, extended.
    *  4   MIPS_COP_0_TLB_CONTEXT  3636 TLB Context.
    *  5   MIPS_COP_0_TLB_PG_MASK  .333 TLB Page Mask register.
    *  6   MIPS_COP_0_TLB_WIRED    .333 Wired TLB number.
    *  8   MIPS_COP_0_BAD_VADDR    3636 Bad virtual address.
    *  9   MIPS_COP_0_COUNT        .333 Count register.
    * 10   MIPS_COP_0_TLB_HI       3636 TLB entry high.
    * 11   MIPS_COP_0_COMPARE      .333 Compare (against Count).
    * 12   MIPS_COP_0_STATUS       3333 Status register.
    * 13   MIPS_COP_0_CAUSE        3333 Exception cause register.
    * 14   MIPS_COP_0_EXC_PC       3636 Exception PC.
    * 15   MIPS_COP_0_PRID         3333 Processor revision identifier.
    * 16   MIPS_COP_0_CONFIG       3333 Configuration register.
    * 16/1 MIPS_COP_0_CONFIG1      ..33 Configuration register 1.
    * 16/2 MIPS_COP_0_CONFIG2      ..33 Configuration register 2.
    * 16/3 MIPS_COP_0_CONFIG3      ..33 Configuration register 3.
    * 17   MIPS_COP_0_LLADDR       .336 Load Linked Address.
    * 18   MIPS_COP_0_WATCH_LO     .336 WatchLo register.
    * 19   MIPS_COP_0_WATCH_HI     .333 WatchHi register.
    * 20   MIPS_COP_0_TLB_XCONTEXT .6.6 TLB XContext register.
    * 23   MIPS_COP_0_DEBUG        .... Debug JTAG register.
    * 24   MIPS_COP_0_DEPC         .... DEPC JTAG register.
    * 25   MIPS_COP_0_PERFCNT      ..36 Performance Counter register.
    * 26   MIPS_COP_0_ECC          .3ii ECC / Error Control register.
    * 27   MIPS_COP_0_CACHE_ERR    .3ii Cache Error register.
    * 28/0 MIPS_COP_0_TAG_LO       .3ii Cache TagLo register (instr).
    * 28/1 MIPS_COP_0_DATA_LO      ..ii Cache DataLo register (instr).
    * 28/2 MIPS_COP_0_TAG_LO       ..ii Cache TagLo register (data).
    * 28/3 MIPS_COP_0_DATA_LO      ..ii Cache DataLo register (data).
    * 29/0 MIPS_COP_0_TAG_HI       .3ii Cache TagHi register (instr).
    * 29/1 MIPS_COP_0_DATA_HI      ..ii Cache DataHi register (instr).
    * 29/2 MIPS_COP_0_TAG_HI       ..ii Cache TagHi register (data).
    * 29/3 MIPS_COP_0_DATA_HI      ..ii Cache DataHi register (data).
    * 30   MIPS_COP_0_ERROR_PC     .636 Error EPC register.
    * 31   MIPS_COP_0_DESAVE       .... DESAVE JTAG register.
    */
   #ifdef _LOCORE
   #define _(n)    __CONCAT($,n)
   #else
   #define _(n)    n
   #endif
   #define MIPS_COP_0_TLB_INDEX    _(0)
   #define MIPS_COP_0_TLB_RANDOM   _(1)
           /* Name and meaning of  TLB bits for $2 differ on r3k and r4k. */
   
   #define MIPS_COP_0_TLB_CONTEXT  _(4)
                                           /* $5 and $6 new with MIPS-III */
   #define MIPS_COP_0_BAD_VADDR    _(8)
   #define MIPS_COP_0_TLB_HI       _(10)
   #define MIPS_COP_0_STATUS       _(12)
   #define MIPS_COP_0_CAUSE        _(13)
   #define MIPS_COP_0_EXC_PC       _(14)
   #define MIPS_COP_0_PRID         _(15)
   
   
   /* MIPS-I */
   #define MIPS_COP_0_TLB_LOW      _(2)
   
   /* MIPS-III */
   #define MIPS_COP_0_TLB_LO0      _(2)
   #define MIPS_COP_0_TLB_LO1      _(3)
   
   #define MIPS_COP_0_TLB_PG_MASK  _(5)
   #define MIPS_COP_0_TLB_WIRED    _(6)
   
   #define MIPS_COP_0_COUNT        _(9)
   #define MIPS_COP_0_COMPARE      _(11)
   
   #define MIPS_COP_0_CONFIG       _(16)
   #define MIPS_COP_0_LLADDR       _(17)
   #define MIPS_COP_0_WATCH_LO     _(18)
   #define MIPS_COP_0_WATCH_HI     _(19)
   #define MIPS_COP_0_TLB_XCONTEXT _(20)
   #define MIPS_COP_0_ECC          _(26)
   #define MIPS_COP_0_CACHE_ERR    _(27)
   #define MIPS_COP_0_TAG_LO       _(28)
   #define MIPS_COP_0_TAG_HI       _(29)
   #define MIPS_COP_0_ERROR_PC     _(30)
   
   /* MIPS32/64 */
   #define MIPS_COP_0_DEBUG        _(23)
   #define MIPS_COP_0_DEPC         _(24)
   #define MIPS_COP_0_PERFCNT      _(25)
   #define MIPS_COP_0_DATA_LO      _(28)
   #define MIPS_COP_0_DATA_HI      _(29)
   #define MIPS_COP_0_DESAVE       _(31)
   
   /*
    * Values for the code field in a break instruction.
    */
   #define MIPS_BREAK_INSTR        0x0000000d
   #define MIPS_BREAK_VAL_MASK     0x03ff0000
   #define MIPS_BREAK_VAL_SHIFT    16
   #define MIPS_BREAK_KDB_VAL      512
   #define MIPS_BREAK_SSTEP_VAL    513
   #define MIPS_BREAK_BRKPT_VAL    514
   #define MIPS_BREAK_SOVER_VAL    515
   #define MIPS_BREAK_KDB          (MIPS_BREAK_INSTR | \
                                   (MIPS_BREAK_KDB_VAL << MIPS_BREAK_VAL_SHIFT))
   #define MIPS_BREAK_SSTEP        (MIPS_BREAK_INSTR | \
                                   (MIPS_BREAK_SSTEP_VAL << MIPS_BREAK_VAL_SHIFT))
   #define MIPS_BREAK_BRKPT        (MIPS_BREAK_INSTR | \
                                   (MIPS_BREAK_BRKPT_VAL << MIPS_BREAK_VAL_SHIFT))
   #define MIPS_BREAK_SOVER        (MIPS_BREAK_INSTR | \
                                   (MIPS_BREAK_SOVER_VAL << MIPS_BREAK_VAL_SHIFT))
   
   /*
    * Mininum and maximum cache sizes.
    */
   #define MIPS_MIN_CACHE_SIZE     (16 * 1024)
   #define MIPS_MAX_CACHE_SIZE     (256 * 1024)
   #define MIPS3_MAX_PCACHE_SIZE   (32 * 1024)     /* max. primary cache size */
   
   /*
    * The floating point version and status registers.
    */
   #define MIPS_FPU_ID     $0
   #define MIPS_FPU_CSR    $31
   
   /*
    * The floating point coprocessor status register bits.
    */
   #define MIPS_FPU_ROUNDING_BITS          0x00000003
   #define MIPS_FPU_ROUND_RN               0x00000000
   #define MIPS_FPU_ROUND_RZ               0x00000001
   #define MIPS_FPU_ROUND_RP               0x00000002
   #define MIPS_FPU_ROUND_RM               0x00000003
   #define MIPS_FPU_STICKY_BITS            0x0000007c
   #define MIPS_FPU_STICKY_INEXACT         0x00000004
   #define MIPS_FPU_STICKY_UNDERFLOW       0x00000008
   #define MIPS_FPU_STICKY_OVERFLOW        0x00000010
   #define MIPS_FPU_STICKY_DIV0            0x00000020
   #define MIPS_FPU_STICKY_INVALID         0x00000040
   #define MIPS_FPU_ENABLE_BITS            0x00000f80
   #define MIPS_FPU_ENABLE_INEXACT         0x00000080
   #define MIPS_FPU_ENABLE_UNDERFLOW       0x00000100
   #define MIPS_FPU_ENABLE_OVERFLOW        0x00000200
   #define MIPS_FPU_ENABLE_DIV0            0x00000400
   #define MIPS_FPU_ENABLE_INVALID         0x00000800
   #define MIPS_FPU_EXCEPTION_BITS         0x0003f000
   #define MIPS_FPU_EXCEPTION_INEXACT      0x00001000
   #define MIPS_FPU_EXCEPTION_UNDERFLOW    0x00002000
   #define MIPS_FPU_EXCEPTION_OVERFLOW     0x00004000
   #define MIPS_FPU_EXCEPTION_DIV0         0x00008000
   #define MIPS_FPU_EXCEPTION_INVALID      0x00010000
   #define MIPS_FPU_EXCEPTION_UNIMPL       0x00020000
   #define MIPS_FPU_COND_BIT               0x00800000
   #define MIPS_FPU_FLUSH_BIT              0x01000000      /* r4k,  MBZ on r3k */
   #define MIPS1_FPC_MBZ_BITS              0xff7c0000
   #define MIPS3_FPC_MBZ_BITS              0xfe7c0000
   
   
   /*
    * Constants to determine if have a floating point instruction.
    */
   #define MIPS_OPCODE_SHIFT       26
   #define MIPS_OPCODE_C1          0x11
   
   
   /*
    * The low part of the TLB entry.
    */
   #define MIPS1_TLB_PFN                   0xfffff000
   #define MIPS1_TLB_NON_CACHEABLE_BIT     0x00000800
   #define MIPS1_TLB_DIRTY_BIT             0x00000400
   #define MIPS1_TLB_VALID_BIT             0x00000200
   #define MIPS1_TLB_GLOBAL_BIT            0x00000100
   
   #define MIPS3_TLB_PFN                   0x3fffffc0
   #define MIPS3_TLB_ATTR_MASK             0x00000038
   #define MIPS3_TLB_ATTR_SHIFT            3
   #define MIPS3_TLB_DIRTY_BIT             0x00000004
   #define MIPS3_TLB_VALID_BIT             0x00000002
   #define MIPS3_TLB_GLOBAL_BIT            0x00000001
   
   #define MIPS1_TLB_PHYS_PAGE_SHIFT       12
   #define MIPS3_TLB_PHYS_PAGE_SHIFT       6
   #define MIPS1_TLB_PF_NUM                MIPS1_TLB_PFN
   #define MIPS3_TLB_PF_NUM                MIPS3_TLB_PFN
   #define MIPS1_TLB_MOD_BIT               MIPS1_TLB_DIRTY_BIT
   #define MIPS3_TLB_MOD_BIT               MIPS3_TLB_DIRTY_BIT
   
   /*
    * MIPS3_TLB_ATTR values - coherency algorithm:
    * 0: cacheable, noncoherent, write-through, no write allocate
    * 1: cacheable, noncoherent, write-through, write allocate
    * 2: uncached
    * 3: cacheable, noncoherent, write-back (noncoherent)
    * 4: cacheable, coherent, write-back, exclusive (exclusive)
    * 5: cacheable, coherent, write-back, exclusive on write (sharable)
    * 6: cacheable, coherent, write-back, update on write (update)
    * 7: uncached, accelerated (gather STORE operations)
    */
   #define MIPS3_TLB_ATTR_WT               0 /* IDT */
   #define MIPS3_TLB_ATTR_WT_WRITEALLOCATE 1 /* IDT */
   #define MIPS3_TLB_ATTR_UNCACHED         2 /* R4000/R4400, IDT */
   #define MIPS3_TLB_ATTR_WB_NONCOHERENT   3 /* R4000/R4400, IDT */
   #define MIPS3_TLB_ATTR_WB_EXCLUSIVE     4 /* R4000/R4400 */
   #define MIPS3_TLB_ATTR_WB_SHARABLE      5 /* R4000/R4400 */
   #define MIPS3_TLB_ATTR_WB_UPDATE        6 /* R4000/R4400 */
   #define MIPS4_TLB_ATTR_UNCACHED_ACCELERATED 7 /* R10000 */
   
   
   /*
    * The high part of the TLB entry.
    */
   #define MIPS1_TLB_VPN                   0xfffff000
   #define MIPS1_TLB_PID                   0x00000fc0
   #define MIPS1_TLB_PID_SHIFT             6
   
   #define MIPS3_TLB_VPN2                  0xffffe000
   #define MIPS3_TLB_ASID                  0x000000ff
   
   #define MIPS1_TLB_VIRT_PAGE_NUM         MIPS1_TLB_VPN
   #define MIPS3_TLB_VIRT_PAGE_NUM         MIPS3_TLB_VPN2
   #define MIPS3_TLB_PID                   MIPS3_TLB_ASID
   #define MIPS_TLB_VIRT_PAGE_SHIFT        12
   
   /*
    * r3000: shift count to put the index in the right spot.
    */
   #define MIPS1_TLB_INDEX_SHIFT           8
   
   /*
    * The first TLB that write random hits.
    */
   #define MIPS1_TLB_FIRST_RAND_ENTRY      8
   #define MIPS3_TLB_WIRED_UPAGES          1
   
   /*
    * The number of process id entries.
    */
   #define MIPS1_TLB_NUM_PIDS              64
   #define MIPS3_TLB_NUM_ASIDS             256
   
   /*
    * Patch codes to hide CPU design differences between MIPS1 and MIPS3.
    */
   
   /* XXX simonb: this is before MIPS3_PLUS is defined (and is ugly!) */
   
   #if !(defined(MIPS3) || defined(MIPS4) || defined(MIPS32) || defined(MIPS64)) \
       && defined(MIPS1)                           /* XXX simonb must be neater! */
   #define MIPS_TLB_PID_SHIFT              MIPS1_TLB_PID_SHIFT
   #define MIPS_TLB_NUM_PIDS               MIPS1_TLB_NUM_PIDS
   #endif
   
   #if (defined(MIPS3) || defined(MIPS4) || defined(MIPS32) || defined(MIPS64)) \
       && !defined(MIPS1)                          /* XXX simonb must be neater! */
   #define MIPS_TLB_PID_SHIFT              0
   #define MIPS_TLB_NUM_PIDS               MIPS3_TLB_NUM_ASIDS
   #endif
   
   
   #if !defined(MIPS_TLB_PID_SHIFT)
   #define MIPS_TLB_PID_SHIFT \
       ((MIPS_HAS_R4K_MMU) ? 0 : MIPS1_TLB_PID_SHIFT)
   
   #define MIPS_TLB_NUM_PIDS \
       ((MIPS_HAS_R4K_MMU) ? MIPS3_TLB_NUM_ASIDS : MIPS1_TLB_NUM_PIDS)
   #endif
   
   /*
    * CPU processor revision IDs for company ID == 0 (non mips32/64 chips)
    */
   #define MIPS_R2000      0x01    /* MIPS R2000                   ISA I   */
   #define MIPS_R3000      0x02    /* MIPS R3000                   ISA I   */
   #define MIPS_R6000      0x03    /* MIPS R6000                   ISA II  */
   #define MIPS_R4000      0x04    /* MIPS R4000/R4400             ISA III */
   #define MIPS_R3LSI      0x05    /* LSI Logic R3000 derivative   ISA I   */
   #define MIPS_R6000A     0x06    /* MIPS R6000A                  ISA II  */
   #define MIPS_R3IDT      0x07    /* IDT R3041 or RC36100         ISA I   */
   #define MIPS_R10000     0x09    /* MIPS R10000                  ISA IV  */
   #define MIPS_R4200      0x0a    /* NEC VR4200                   ISA III */
   #define MIPS_R4300      0x0b    /* NEC VR4300                   ISA III */
   #define MIPS_R4100      0x0c    /* NEC VR4100                   ISA III */
   #define MIPS_R12000     0x0e    /* MIPS R12000                  ISA IV  */
   #define MIPS_R14000     0x0f    /* MIPS R14000                  ISA IV  */
   #define MIPS_R8000      0x10    /* MIPS R8000 Blackbird/TFP     ISA IV  */
   #define MIPS_RC32300    0x18    /* IDT RC32334,332,355          ISA 32  */
   #define MIPS_R4600      0x20    /* QED R4600 Orion              ISA III */
   #define MIPS_R4700      0x21    /* QED R4700 Orion              ISA III */
   #define MIPS_R3SONY     0x21    /* Sony R3000 based             ISA I   */
   #define MIPS_R4650      0x22    /* QED R4650                    ISA III */
   #define MIPS_TX3900     0x22    /* Toshiba TX39 family          ISA I   */
   #define MIPS_R5000      0x23    /* MIPS R5000                   ISA IV  */
   #define MIPS_R3NKK      0x23    /* NKK R3000 based              ISA I   */
   #define MIPS_RC32364    0x26    /* IDT RC32364                  ISA 32  */
   #define MIPS_RM7000     0x27    /* QED RM7000                   ISA IV  */
   #define MIPS_RM5200     0x28    /* QED RM5200s                  ISA IV  */
   #define MIPS_TX4900     0x2d    /* Toshiba TX49 family          ISA III */
   #define MIPS_R5900      0x2e    /* Toshiba R5900 (EECore)       ISA --- */
   #define MIPS_RC64470    0x30    /* IDT RC64474/RC64475          ISA III */
   #define MIPS_TX7900     0x38    /* Toshiba TX79                 ISA III+*/
   #define MIPS_R5400      0x54    /* NEC VR5400                   ISA IV  */
   #define MIPS_R5500      0x55    /* NEC VR5500                   ISA IV  */
   
   /*
    * CPU revision IDs for some prehistoric processors.
    */
   
   /* For MIPS_R3000 */
   #define MIPS_REV_R3000          0x20
   #define MIPS_REV_R3000A         0x30
   
   /* For MIPS_TX3900 */
   #define MIPS_REV_TX3912         0x10
   #define MIPS_REV_TX3922         0x30
   #define MIPS_REV_TX3927         0x40
   
   /* For MIPS_R4000 */
   #define MIPS_REV_R4000_A        0x00
   #define MIPS_REV_R4000_B        0x22
   #define MIPS_REV_R4000_C        0x30
   #define MIPS_REV_R4400_A        0x40
   #define MIPS_REV_R4400_B        0x50
   #define MIPS_REV_R4400_C        0x60
   
   /* For MIPS_TX4900 */
   #define MIPS_REV_TX4927         0x22
   
   /*
    * CPU processor revision IDs for company ID == 1 (MIPS)
    */
   #define MIPS_4Kc        0x80    /* MIPS 4Kc                     ISA 32  */
   #define MIPS_5Kc        0x81    /* MIPS 5Kc                     ISA 64  */
   #define MIPS_20Kc       0x82    /* MIPS 20Kc                    ISA 64  */
   #define MIPS_4Kmp       0x83    /* MIPS 4Km/4Kp                 ISA 32  */
   #define MIPS_4KEc       0x84    /* MIPS 4KEc                    ISA 32  */
   #define MIPS_4KEmp      0x85    /* MIPS 4KEm/4KEp               ISA 32  */
   #define MIPS_4KSc       0x86    /* MIPS 4KSc                    ISA 32  */
   #define MIPS_M4K        0x87    /* MIPS M4K                     ISA 32  Rel 2 */
   #define MIPS_25Kf       0x88    /* MIPS 25Kf                    ISA 64  */
   #define MIPS_5KE        0x89    /* MIPS 5KE                     ISA 64  Rel 2 */
   #define MIPS_4KEc_R2    0x90    /* MIPS 4KEc_R2                 ISA 32  Rel 2 */
   #define MIPS_4KEmp_R2   0x91    /* MIPS 4KEm/4KEp_R2            ISA 32  Rel 2 */
   #define MIPS_4KSd       0x92    /* MIPS 4KSd                    ISA 32  Rel 2 */
   
   /*
    * Alchemy (company ID 3) use the processor ID field to donote the CPU core
    * revision and the company options field do donate the SOC chip type.
    */
   /* CPU processor revision IDs */
   #define MIPS_AU_REV1    0x01    /* Alchemy Au1000 (Rev 1)       ISA 32  */
   #define MIPS_AU_REV2    0x02    /* Alchemy Au1000 (Rev 2)       ISA 32  */
   /* CPU company options IDs */
   #define MIPS_AU1000     0x00
   #define MIPS_AU1500     0x01
   #define MIPS_AU1100     0x02
   
   /*
    * CPU processor revision IDs for company ID == 4 (SiByte)
    */
   #define MIPS_SB1        0x01    /* SiByte SB1                   ISA 64  */
   
   /*
    * CPU processor revision IDs for company ID == 5 (SandCraft)
    */
   #define MIPS_SR7100     0x04    /* SandCraft SR7100             ISA 64  */
   
   /*
    * FPU processor revision ID
    */
   #define MIPS_SOFT       0x00    /* Software emulation           ISA I   */
   #define MIPS_R2360      0x01    /* MIPS R2360 FPC               ISA I   */
   #define MIPS_R2010      0x02    /* MIPS R2010 FPC               ISA I   */
   #define MIPS_R3010      0x03    /* MIPS R3010 FPC               ISA I   */
   #define MIPS_R6010      0x04    /* MIPS R6010 FPC               ISA II  */
   #define MIPS_R4010      0x05    /* MIPS R4010 FPC               ISA II  */
   #define MIPS_R31LSI     0x06    /* LSI Logic derivate           ISA I   */
   #define MIPS_R3TOSH     0x22    /* Toshiba R3000 based FPU      ISA I   */
   
   #ifdef ENABLE_MIPS_TX3900
   #include <mips/r3900regs.h>
   #endif
   #ifdef MIPS3_5900
   #include <mips/r5900regs.h>
   #endif
   #ifdef MIPS64_SB1
   #include <mips/sb1regs.h>
   #endif
   
   #endif /* _MIPS_CPUREGS_H_ */

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