db_asm.s

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    1 /*
    2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
    3  *
    4  * @APPLE_LICENSE_HEADER_START@
    5  * 
    6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
    7  * 
    8  * This file contains Original Code and/or Modifications of Original Code
    9  * as defined in and that are subject to the Apple Public Source License
   10  * Version 2.0 (the 'License'). You may not use this file except in
   11  * compliance with the License. Please obtain a copy of the License at
   12  * http://www.opensource.apple.com/apsl/ and read it before using this
   13  * file.
   14  * 
   15  * The Original Code and all software distributed under the License are
   16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
   20  * Please see the License for the specific language governing rights and
   21  * limitations under the License.
   22  * 
   23  * @APPLE_LICENSE_HEADER_END@
   24  */
   25 /*
   26  * @OSF_COPYRIGHT@
   27  */
   28 
   29 #include <debug.h>
   30 #include <ppc/asm.h>
   31 #include <ppc/proc_reg.h>
   32 #include <mach/ppc/vm_param.h>
   33 #include <assym.s>
   34 
   35 
   36 /* void
   37  * db_phys_cmp(src_a, src_b, bytecount)
   38  *      vm_offset_t     src_a;
   39  *      vm_offset_t     src_b;
   40  *      int             bytecount
   41  *
   42  * This routine will compare bytecount bytes from physical address src_a and physical
   43  * address src_b. 
   44  */
   45 
   46 #warning THIS IS BROKEN FOR 64-BIT
   47 
   48         /* Switch off data translations */
   49         lis             r7,hi16(MASK(MSR_VEC))
   50         ori             r7,r7,lo16(MASK(MSR_FP))
   51         mfmsr   r6
   52         andc    r6,r6,r7                        ; Force FP and vec off
   53         ori             r7,r7,lo16(MASK(MSR_DR))        ; Set the DR bit
   54         andc    r7,r6,r7                        ; Force DR off
   55         mtmsr   r7
   56         isync                   /* Ensure data translations are off */
   57 
   58         subi    r3,     r3,     4
   59         subi    r4,     r4,     4
   60 
   61         cmpwi   r5,     3
   62         ble-    .L_db_phys_cmp_bytes
   63 .L_db_phys_cmp_loop:
   64         lwz     r0,     4(r3)
   65         lwz     r7,     4(r4)
   66         addi    r3,     r3,     4
   67         addi    r4,     r4,     4
   68         subi    r5,     r5,     4
   69         cmpw    r0,     r7
   70         bne     .L_db_phys_cmp_false
   71         cmpwi   r5,     3
   72         bgt+    .L_db_phys_cmp_loop
   73 
   74         /* If no leftover bytes, we're done now */
   75         cmpwi   r5,     0
   76         beq+    .L_db_phys_cmp_true
   77         
   78 .L_db_phys_cmp_bytes:
   79         addi    r3,     r3,     3
   80         addi    r4,     r4,     3
   81 .L_db_phys_cmp_byte_loop:       
   82         lbz     r0,     1(r3)
   83         lbz     r7,     1(r4)
   84         addi    r3,     r3,     1
   85         addi    r4,     r4,     1
   86         subi    r5,     r5,     1
   87         cmpw    r0,     r7
   88         bne     .L_db_phys_cmp_false
   89         cmpwi   r5,     0
   90         bne+    .L_db_phys_cmp_loop
   91 
   92 .L_db_phys_cmp_true:
   93         li      r3,     1
   94         b       .L_db_phys_cmp_done
   95 
   96 .L_db_phys_cmp_false:
   97         li      r3,     0
   98 
   99 .L_db_phys_cmp_done:
  100         mtmsr   r6              /* Restore original translations */
  101         isync                   /* Ensure data translations are off */
  102 
  103         blr
  104

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FreeBSD/Linux Kernel Cross Reference sys/osfmk/ppc/db_asm.s

FreeBSD/Linux Kernel Cross Reference
sys/osfmk/ppc/db_asm.s