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Annotation of XNU/osfmk/ppc/db_asm.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: /*
        !            23:  * @OSF_COPYRIGHT@
        !            24:  */
        !            25: 
        !            26: #include <debug.h>
        !            27: #include <ppc/asm.h>
        !            28: #include <ppc/proc_reg.h>
        !            29: #include <mach/ppc/vm_param.h>
        !            30: #include <assym.s>
        !            31: 
        !            32: /* void
        !            33:  * db_phys_copy(src, dst, bytecount)
        !            34:  *      vm_offset_t     src;
        !            35:  *      vm_offset_t     dst;
        !            36:  *      int             bytecount
        !            37:  *
        !            38:  * This routine will copy bytecount bytes from physical address src to physical
        !            39:  * address dst. 
        !            40:  */
        !            41: ENTRY(db_phys_copy, TAG_NO_FRAME_USED)
        !            42: 
        !            43:        /* Switch off data translations */
        !            44:        mfmsr   r6
        !            45:        rlwinm  r7,     r6,     0,      MSR_DR_BIT+1,   MSR_DR_BIT-1
        !            46:        mtmsr   r7
        !            47:        isync                   /* Ensure data translations are off */
        !            48: 
        !            49:        subi    r3,     r3,     4
        !            50:        subi    r4,     r4,     4
        !            51: 
        !            52:        cmpwi   r5,     3
        !            53:        ble-    .L_db_phys_copy_bytes
        !            54: .L_db_phys_copy_loop:
        !            55:        lwz     r0,     4(r3)
        !            56:        addi    r3,     r3,     4
        !            57:        subi    r5,     r5,     4
        !            58:        stw     r0,     4(r4)
        !            59:        addi    r4,     r4,     4
        !            60:        cmpwi   r5,     3
        !            61:        bgt+    .L_db_phys_copy_loop
        !            62: 
        !            63:        /* If no leftover bytes, we're done now */
        !            64:        cmpwi   r5,     0
        !            65:        beq+    .L_db_phys_copy_done
        !            66:        
        !            67: .L_db_phys_copy_bytes:
        !            68:        addi    r3,     r3,     3
        !            69:        addi    r4,     r4,     3
        !            70: .L_db_phys_copy_byte_loop:     
        !            71:        lbz     r0,     1(r3)
        !            72:        addi    r3,     r3,     1
        !            73:        subi    r5,     r5,     1
        !            74:        stb     r0,     1(r4)
        !            75:        addi    r4,     r4,     1
        !            76:        cmpwi   r5,     0
        !            77:        bne+    .L_db_phys_copy_loop
        !            78: 
        !            79: .L_db_phys_copy_done:
        !            80:        mtmsr   r6              /* Restore original translations */
        !            81:        isync                   /* Ensure data translations are off */
        !            82: 
        !            83:        blr
        !            84: 
        !            85: /* void
        !            86:  * db_phys_cmp(src_a, src_b, bytecount)
        !            87:  *      vm_offset_t     src_a;
        !            88:  *      vm_offset_t     src_b;
        !            89:  *      int             bytecount
        !            90:  *
        !            91:  * This routine will compare bytecount bytes from physical address src_a and physical
        !            92:  * address src_b. 
        !            93:  */
        !            94: 
        !            95:        /* Switch off data translations */
        !            96:        mfmsr   r6
        !            97:        rlwinm  r7,     r6,     0,      MSR_DR_BIT+1,   MSR_DR_BIT-1
        !            98:        mtmsr   r7
        !            99:        isync                   /* Ensure data translations are off */
        !           100: 
        !           101:        subi    r3,     r3,     4
        !           102:        subi    r4,     r4,     4
        !           103: 
        !           104:        cmpwi   r5,     3
        !           105:        ble-    .L_db_phys_cmp_bytes
        !           106: .L_db_phys_cmp_loop:
        !           107:        lwz     r0,     4(r3)
        !           108:        lwz     r7,     4(r4)
        !           109:        addi    r3,     r3,     4
        !           110:        addi    r4,     r4,     4
        !           111:        subi    r5,     r5,     4
        !           112:        cmpw    r0,     r7
        !           113:        bne     .L_db_phys_cmp_false
        !           114:        cmpwi   r5,     3
        !           115:        bgt+    .L_db_phys_cmp_loop
        !           116: 
        !           117:        /* If no leftover bytes, we're done now */
        !           118:        cmpwi   r5,     0
        !           119:        beq+    .L_db_phys_cmp_true
        !           120:        
        !           121: .L_db_phys_cmp_bytes:
        !           122:        addi    r3,     r3,     3
        !           123:        addi    r4,     r4,     3
        !           124: .L_db_phys_cmp_byte_loop:      
        !           125:        lbz     r0,     1(r3)
        !           126:        lbz     r7,     1(r4)
        !           127:        addi    r3,     r3,     1
        !           128:        addi    r4,     r4,     1
        !           129:        subi    r5,     r5,     1
        !           130:        cmpw    r0,     r7
        !           131:        bne     .L_db_phys_cmp_false
        !           132:        cmpwi   r5,     0
        !           133:        bne+    .L_db_phys_cmp_loop
        !           134: 
        !           135: .L_db_phys_cmp_true:
        !           136:        li      r3,     1
        !           137:        b       .L_db_phys_cmp_done
        !           138: 
        !           139: .L_db_phys_cmp_false:
        !           140:        li      r3,     0
        !           141: 
        !           142: .L_db_phys_cmp_done:
        !           143:        mtmsr   r6              /* Restore original translations */
        !           144:        isync                   /* Ensure data translations are off */
        !           145: 
        !           146:        blr
        !           147: 

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