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Annotation of kernel/machdep/ppc/misc_asm.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*     HISTORY
        !            26:  *
        !            27:  *  1998/02/25  Umesh Vaishampayan  ([email protected])
        !            28:  *     Moved kdp_flush_icache() to cache.s
        !            29:  *
        !            30:  *     1997/10/14      Umesh Vaishampayan      ([email protected])
        !            31:  *             Added disable_ee() and restore_ee() for the use of mcount.
        !            32:  *
        !            33:  *     1997/05/16      Rene Vega -- Cleanup sync/isync usage.
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Copyright 1996 1995 by Open Software Foundation, Inc. 1997 1996 1995 1994 1993 1992 1991  
        !            38:  *              All Rights Reserved 
        !            39:  *  
        !            40:  * Permission to use, copy, modify, and distribute this software and 
        !            41:  * its documentation for any purpose and without fee is hereby granted, 
        !            42:  * provided that the above copyright notice appears in all copies and 
        !            43:  * that both the copyright notice and this permission notice appear in 
        !            44:  * supporting documentation. 
        !            45:  *  
        !            46:  * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 
        !            47:  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
        !            48:  * FOR A PARTICULAR PURPOSE. 
        !            49:  *  
        !            50:  * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 
        !            51:  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 
        !            52:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 
        !            53:  * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 
        !            54:  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 
        !            55:  */
        !            56: /*
        !            57:  * MKLINUX-1.0DR2
        !            58:  */
        !            59: 
        !            60: #include <assym.h>
        !            61: #include <machdep/ppc/asm.h>
        !            62: #include <machdep/ppc/proc_reg.h>
        !            63: #include <mach/ppc/vm_param.h>
        !            64: #include <machdep/ppc/powermac.h>
        !            65: 
        !            66: /* Disable external interrupts and return the previous value of msr */
        !            67: /* These routines are used by mcount() */
        !            68: ENTRY(disable_ee, TAG_NO_FRAME_USED)
        !            69:        mfmsr   r3
        !            70:        rlwinm  r0, r3, 0,  MSR_EE_BIT+1,   MSR_EE_BIT-1
        !            71:        mtmsr   r0
        !            72:        blr
        !            73: 
        !            74: /* /Restore the msr to the value passed in the first parameter */
        !            75: ENTRY(restore_ee, TAG_NO_FRAME_USED)
        !            76:        mtmsr   r3
        !            77:        blr
        !            78: 
        !            79: /* Mask and unmask interrupts at the processor level */        
        !            80: ENTRY(interrupt_disable, TAG_NO_FRAME_USED)
        !            81:        mfmsr   r0
        !            82:        rlwinm  r0,     r0,     0,      MSR_EE_BIT+1,   MSR_EE_BIT-1
        !            83:        mtmsr   r0
        !            84:        blr
        !            85: 
        !            86: ENTRY(interrupt_enable, TAG_NO_FRAME_USED)
        !            87:        mfmsr   r0
        !            88:        ori     r0,     r0,     MASK(MSR_EE)
        !            89:        mtmsr   r0
        !            90:        blr
        !            91: 
        !            92:        
        !            93: /*
        !            94: **     get_timebase()
        !            95: **
        !            96: **     Entry   - R3 contains pointer to 64 bit structure.
        !            97: **
        !            98: **     Exit    - 64 bit structure filled in.
        !            99: **
        !           100: */
        !           101: ENTRY(get_timebase, TAG_NO_FRAME_USED)
        !           102: loop:
        !           103:        mftbu   r4
        !           104:        mftb    r5
        !           105:        mftbu   r6
        !           106:        cmpw    r6, r4
        !           107:        bne     loop
        !           108: 
        !           109:        stw     r4, 0(r3)
        !           110:        stw     r5, 4(r3)
        !           111: 
        !           112:        blr
        !           113: 
        !           114: 
        !           115: /*
        !           116:  * Boolean     test_and_set (UInt32 theBit, UInt8 *theAddress)
        !           117:  *{
        !           118:  *     UInt32          theValue;
        !           119:  *     UInt32          theMask;
        !           120:  *     
        !           121:  *     theAddress += theBit / 8;
        !           122:  *     theBit %= 8;
        !           123:  *     
        !           124:  *     theBit += (theAddress % 4) * 8;
        !           125:  *     theAddress &= ~(0x00000003);            // long-align the address
        !           126:  *     
        !           127:  *     theMask = 1 << (31 - theBit);
        !           128:  *     
        !           129:  *     while (true) {
        !           130:  *             theValue = __lwarx(theAddress);
        !           131:  *             if ((theValue & theMask) != 0)
        !           132:  *                     return true;
        !           133:  *             
        !           134:  *             if (__stwcx(theValue | theMask, theAddress))
        !           135:  *                     return false;
        !           136:  *     }
        !           137:  *}
        !           138:  */
        !           139: ENTRY(test_and_set, TAG_NO_FRAME_USED)
        !           140:        
        !           141:        rlwinm  r7, r3, (32 - 3), 3,31          // r7 = theBit / 8
        !           142:        rlwinm  r3, r3, 0, 29,31                // theBit %= 8
        !           143:        add     r4, r4, r7                      // theAddress += theBit / 8
        !           144:        rlwinm  r7, r4, 3, 27,28                // r7 = (theAddress % 4) * 8
        !           145:        add     r3, r3, r7                      // theBit += (theAddress %4)*8
        !           146:        rlwinm  r4, r4, 0, 0,29                 // long-align the address
        !           147:        li      r7, 1
        !           148:        nor     r3, r3, r3                      // theBit = 31 - theBit
        !           149:        rlwnm   r7, r7, r3, 0,31                // theMask = 1 << (31 - theBit)
        !           150:        
        !           151:        li      r3, 1                           // assume it is already set
        !           152:        
        !           153: Ltasl:
        !           154:        sync
        !           155:        lwarx   r5, 0, r4
        !           156:        and.    r8, r5, r7                      // was the masked bit set?
        !           157:        bnelr                                   // it was already set, return
        !           158: 
        !           159:        or      r5, r5, r7                      // set the bit
        !           160:        sync
        !           161:        stwcx.  r5, 0, r4
        !           162:        bne-    Ltasl
        !           163:        isync
        !           164:        li      r3, 0
        !           165:        
        !           166:        blr
        !           167: 

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