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Annotation of XNU/osfmk/kdp/ml/ppc/kdp_misc.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: #include <debug.h>
        !            23: #include <ppc/asm.h>
        !            24: #include <ppc/proc_reg.h>
        !            25: #include <mach/ppc/vm_param.h>
        !            26: #include <assym.s>
        !            27: 
        !            28: .set kLog2CacheLineSize, 5
        !            29: .set kCacheLineSize, 32
        !            30:  
        !            31: ENTRY(kdp_flush_cache, TAG_NO_FRAME_USED)
        !            32:        cmpi    cr0,0,r4,0                      /* is this zero length? */
        !            33:        add     r4,r3,r4                        /* calculate last byte + 1 */
        !            34:        subi    r4,r4,1                         /* calculate last byte */
        !            35: 
        !            36:        srwi    r5,r3,kLog2CacheLineSize        /* calc first cache line index */
        !            37:        srwi    r4,r4,kLog2CacheLineSize        /* calc last cache line index */
        !            38:        beq     cr0, LdataToCodeDone            /* done if zero length */
        !            39: 
        !            40:        subf    r4,r5,r4                        /* calc diff (# lines minus 1) */
        !            41:        addi    r4,r4,1                         /* # of cache lines to flush */
        !            42:        slwi    r5,r5,kLog2CacheLineSize        /* calc addr of first cache line */
        !            43: 
        !            44:        /* flush the data cache lines */
        !            45:        mr      r3,r5                           /* starting address for loop */
        !            46:        mtctr   r4                                      /* loop count */
        !            47: LdataToCodeFlushLoop:
        !            48:        dcbf    0, r3                                           /* flush the data cache line */
        !            49:        addi    r3,r3,kCacheLineSize            /* advance to next cache line */
        !            50:        bdnz    LdataToCodeFlushLoop            /* loop until count is zero */
        !            51:        sync                                                            /* wait until RAM is valid */
        !            52: 
        !            53:        /* invalidate the code cache lines */
        !            54:        mr      r3,r5                                           /* starting address for loop */
        !            55:        mtctr   r4                                                      /* loop count */
        !            56: LdataToCodeInvalidateLoop:
        !            57:        icbi    0, r3                                           /* invalidate code cache line */
        !            58:        addi    r3,r3,kCacheLineSize            /* advance to next cache line */
        !            59:        bdnz    LdataToCodeInvalidateLoop       /* loop until count is zero */
        !            60:        sync                                                            /* wait until last icbi completes */
        !            61:        isync                                                           /* discard prefetched instructions */
        !            62: LdataToCodeDone:
        !            63:        blr                                                                     /* return nothing */
        !            64: 
        !            65: ENTRY(kdp_sync_cache, TAG_NO_FRAME_USED)
        !            66:        sync                                    /* data sync */
        !            67:        isync                                   /* inst sync */
        !            68:        blr                                             /* return nothing */
        !            69: 
        !            70: ENTRY(kdp_xlate_off, TAG_NO_FRAME_USED)
        !            71:        mfmsr   r3
        !            72:        rlwinm  r4, r3, 0, MSR_DR_BIT+1, MSR_IR_BIT-1
        !            73:        mtmsr   r4
        !            74:        isync
        !            75:        blr
        !            76: 
        !            77: ENTRY(kdp_xlate_restore, TAG_NO_FRAME_USED)
        !            78:        mtmsr   r3
        !            79:        isync
        !            80:        blr
        !            81: 

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