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Annotation of kernel/machdep/ppc/start.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: 
        !            26: #include <machdep/ppc/asm.h>
        !            27: #include <machdep/ppc/proc_reg.h>
        !            28: #include <mach/ppc/vm_param.h>
        !            29: #include <assym.h>
        !            30:        
        !            31: /*
        !            32:  * Interrupt and bootup stack for initial processor
        !            33:  */
        !            34: 
        !            35:        .file   "start.s"
        !            36:        
        !            37:        .data
        !            38:        .align  PPC_PGSHIFT             /* Align on page boundry */
        !            39:        .set    ., .+PPC_PGBYTES        /* Red zone for interrupt stack*/
        !            40:         .globl  EXT(intstack)          /* intstack itself */
        !            41: EXT(intstack):
        !            42:        .set    ., .+INTSTACK_SIZE
        !            43: 
        !            44:        /*
        !            45:         * intstack_top_ss points to the topmost saved
        !            46:         * state structure in the intstack
        !            47:         */
        !            48:        .align  ALIGNMENT
        !            49:         .globl  EXT(intstack_top_ss)
        !            50: EXT(intstack_top_ss):
        !            51:        .long   EXT(intstack)+INTSTACK_SIZE-SS_SIZE
        !            52: 
        !            53: 
        !            54:        /* GDB stack - used by the debugger if present */
        !            55:         .globl  EXT(gdbstack)
        !            56: EXT(gdbstack):
        !            57:        .set    ., .+KERNSTACK_SIZE
        !            58: 
        !            59:        /*
        !            60:         * gdbstack_top_ss points to the topmost saved
        !            61:         * state structure in the gdbstack
        !            62:         */
        !            63:        .align  ALIGNMENT
        !            64:         .globl  EXT(gdbstack_top_ss)
        !            65: EXT(gdbstack_top_ss):
        !            66:        .long   EXT(gdbstack)+KERNSTACK_SIZE-SS_SIZE
        !            67: 
        !            68:         .globl  EXT(gdbstackptr)
        !            69: EXT(gdbstackptr):
        !            70:        .long   EXT(gdbstack)+KERNSTACK_SIZE-SS_SIZE
        !            71:        
        !            72: 
        !            73: /*
        !            74:  * All CPUs start here.
        !            75:  *
        !            76:  * How we got to here (as of today 1997.02.27) in execution:
        !            77:  *
        !            78:  * OpenFirmware loaded the 'SecondaryLoader' from a bootp/tftp server
        !            79:  * on the same subnet as this machine.  The SecondaryLoader brought
        !            80:  * this mach-o (MH_PRELOAD) image into memory and jumped to the
        !            81:  * start address.
        !            82:  *
        !            83:  * We expect that:
        !            84:  *     we are in supervisor mode (of course!)
        !            85:  *     Translations are off
        !            86:  *     ARG0 == pointer to startup parameters
        !            87:  *
        !            88:  * We do the following:
        !            89:  *     Force the MSR to a known state
        !            90:  *     Switch to our stack
        !            91:  *     Call into the C code.
        !            92:  *     
        !            93:  */
        !            94: 
        !            95:        .data
        !            96:        .align  3
        !            97: EXT(FloatInit):
        !            98:        .long   0xC24BC195              /* Initial value */
        !            99:        .long   0x87859393              /* of floating point registers */
        !           100:     .globl  EXT(FloatInit)
        !           101: 
        !           102:        .text
        !           103:        .align 2
        !           104:        
        !           105: ASENTRY(start)
        !           106: 
        !           107: 
        !           108: #ifndef UseOpenFirmware
        !           109:        /* Make sure our MSR is valid */
        !           110:        li      r0,     MSR_VM_OFF
        !           111:        sync
        !           112:        mtmsr   r0
        !           113:        isync
        !           114: #ifdef UNCACHED_DATA_604
        !           115:        lis     r28, 0x4        /* flush 128K */
        !           116:        lis     r0, 0x2
        !           117: .L_loop_flush:
        !           118:        lwzx    r29, 0, r28
        !           119:        subic   r28, r28, 32
        !           120:        cmpw    r0, r28
        !           121:        bge+    .L_loop_flush
        !           122: #endif /* UNCACHED_DATA_604 */
        !           123: 
        !           124: /*     li      r28, 0x84 */    /* turn on branch prediction, turn of serial */
        !           125: /*     li      r28, 0 */
        !           126: 
        !           127:        mfspr   r28,    hid0
        !           128: 
        !           129: #ifdef UNCACHED_DATA_604
        !           130:        rlwinm  r28,    r28,    0,      21+1,   21-1 /* invalidate data cache */
        !           131:        rlwinm  r28,    r28,    0,      17+1,   17-1 /* turn off data cache */
        !           132: #endif /* UNCACHED_DATA_604 */
        !           133: #ifdef UNCACHED_INST_604
        !           134:        rlwinm  r28,    r28,    0,      20+1,   20-1 /* invalidate inst cache */
        !           135:        rlwinm  r28,    r28,    0,      16+1,   16-1 /* turn off inst cache */
        !           136: #endif /* UNCACHED_INST_604 */
        !           137: 
        !           138:        //rlwinm        r28,    r28,    0,      24+1,   24-1 /* turn on serial execution */
        !           139: 
        !           140:        mtspr   hid0,r28
        !           141: 
        !           142: #endif /* UseOpenFirmware */
        !           143: 
        !           144:        li      r0,     MSR_VM_OFF|MASK(MSR_FP)
        !           145:        mtmsr   r0
        !           146:        isync
        !           147: 
        !           148:        lis             r29,hi16(EXT(FloatInit))        /* Get top of floating point init value */
        !           149:        ori             r29,r29,lo16(EXT(FloatInit))    /* Slam bottom */
        !           150:        lfd             f0,0(r29)                       /* Initialize FP0 */
        !           151:        fmr             f1,f0                           /* Ours is not */
        !           152:        fmr             f2,f0                           /* to wonder why, */
        !           153:        fmr             f3,f0                           /* ours is but to */
        !           154:        fmr             f4,f0                           /* do or die! */
        !           155:        fmr             f5,f0
        !           156:        fmr             f6,f0
        !           157:        fmr             f7,f0
        !           158:        fmr             f8,f0
        !           159:        fmr             f9,f0
        !           160:        fmr             f10,f0
        !           161:        fmr             f11,f0
        !           162:        fmr             f12,f0
        !           163:        fmr             f13,f0
        !           164:        fmr             f14,f0
        !           165:        fmr             f15,f0
        !           166:        fmr             f16,f0
        !           167:        fmr             f17,f0
        !           168:        fmr             f18,f0
        !           169:        fmr             f19,f0
        !           170:        fmr             f20,f0
        !           171:        fmr             f21,f0
        !           172:        fmr             f22,f0
        !           173:        fmr             f23,f0
        !           174:        fmr             f24,f0
        !           175:        fmr             f25,f0
        !           176:        fmr             f26,f0
        !           177:        fmr             f27,f0
        !           178:        fmr             f28,f0
        !           179:        fmr             f29,f0
        !           180:        fmr             f30,f0
        !           181:        fmr             f31,f0
        !           182: 
        !           183:        li      r0,     MSR_VM_OFF
        !           184:        mtmsr   r0
        !           185:        isync
        !           186:        
        !           187:        addis   r29,    0,      hi16(EXT(intstack_top_ss))
        !           188:        ori     r29,    r29,    lo16(EXT(intstack_top_ss))
        !           189:        lwz     r29,    0(r29)
        !           190: 
        !           191: #ifdef GPROF
        !           192:        subi    r29, r29, FM_REDZONE    ; we save more state in ppc_init()
        !           193: #endif
        !           194: 
        !           195:        li      r28,    0
        !           196:        stw     r28,    FM_BACKPTR(r29) /* store a null frame backpointer */
        !           197: 
        !           198:        /* move onto new stack */
        !           199:        
        !           200:        mr      r1,     r29
        !           201: 
        !           202:        bl      EXT(ppc_init)
        !           203: 
        !           204:        /* Should never return */
        !           205: 
        !           206:        BREAKPOINT_TRAP

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