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Annotation of XNU/osfmk/ppc/bsd_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: #include <debug.h>           
        !            23: #include <mach_assert.h>
        !            24: #include <mach/exception_types.h>
        !            25: #include <mach/ppc/vm_param.h> 
        !            26:         
        !            27: #include <assym.s>
        !            28:  
        !            29: #include <ppc/asm.h> 
        !            30: #include <ppc/proc_reg.h>
        !            31: #include <ppc/trap.h>
        !            32: #include <ppc/exception.h>
        !            33:  
        !            34: /*
        !            35:  * void cthread_set_self(cproc_t p)
        !            36:  *
        !            37:  * set's thread state "user_value"
        !            38:  *
        !            39:  * This op is invoked as follows:
        !            40:  *     li r0, CthreadSetSelfNumber     // load the fast-trap number
        !            41:  *     sc                              // invoke fast-trap
        !            42:  *     blr
        !            43:  *
        !            44:  * Entry:      VM switched ON
        !            45:  *             Interrupts  OFF
        !            46:  *              original r1-3 saved in sprg1-3
        !            47:  *              original srr0 and srr1 saved in per_proc_info structure
        !            48:  *              original cr            saved in per_proc_info structure
        !            49:  *              exception type         saved in per_proc_info structure
        !            50:  *              r1 = scratch
        !            51:  *              r2 = virt addr of per_proc_info
        !            52:  *             r3 = exception type (one of EXC_...)
        !            53:  *
        !            54:  */
        !            55:        .text
        !            56:        .align  5
        !            57: ENTRY(CthreadSetSelfNumber, TAG_NO_FRAME_USED)
        !            58:        lwz     r1,     PP_CPU_DATA(r2)
        !            59:        lwz     r1,     CPU_ACTIVE_THREAD(r1)
        !            60:        lwz     r1,     THREAD_TOP_ACT(r1)  
        !            61:        lwz     r1,     ACT_MACT_PCB(r1)
        !            62: 
        !            63:        mfsprg  r3,     3
        !            64:        stw     r3,     CTHREAD_SELF(r1)
        !            65: 
        !            66:        /* Prepare to rfi to the exception exit routine, which is
        !            67:         * in physical address space */
        !            68:        addis   r3,     0,      HIGH_CADDR(EXT(exception_exit))
        !            69:        addi    r3,     r3,     LOW_ADDR(EXT(exception_exit))
        !            70: 
        !            71:        lwz     r3,     0(r3)
        !            72:        mtsrr0  r3
        !            73:        li      r3,     MSR_VM_OFF
        !            74:        mtsrr1  r3
        !            75: 
        !            76:        lwz     r3,     PP_SAVE_SRR1(r2)        /* load the last register... */
        !            77:        lwz     r2,     PP_SAVE_SRR0(r2)        /* For trampoline */
        !            78:        lwz     r1,     PCB_SR0(r1)             /* For trampoline... */
        !            79: 
        !            80:        rfi
        !            81: 
        !            82: 
        !            83: /*
        !            84:  * ur_cthread_t ur_cthread_self(void)
        !            85:  *
        !            86:  * return thread state "user_value"
        !            87:  *
        !            88:  * This op is invoked as follows:
        !            89:  *     li r0, UrCthreadSelfNumber      // load the fast-trap number
        !            90:  *     sc                              // invoke fast-trap
        !            91:  *     blr
        !            92:  *
        !            93:  * Entry:      VM switched ON
        !            94:  *             Interrupts  OFF
        !            95:  *              original r1-3 saved in sprg1-3
        !            96:  *              original srr0 and srr1 saved in per_proc_info structure
        !            97:  *              original cr            saved in per_proc_info structure
        !            98:  *              exception type         saved in per_proc_info structure
        !            99:  *              r1 = scratch
        !           100:  *              r2 = virt addr of per_proc_info
        !           101:  *             r3 = exception type (one of EXC_...)
        !           102:  *
        !           103:  */
        !           104:        .text
        !           105:        .align  5
        !           106: ENTRY(UrCthreadSelfNumber, TAG_NO_FRAME_USED)
        !           107:        lwz     r1,     PP_CPU_DATA(r2)
        !           108:        lwz     r1,     CPU_ACTIVE_THREAD(r1)
        !           109:        lwz     r1,     THREAD_TOP_ACT(r1)  
        !           110:        lwz     r1,     ACT_MACT_PCB(r1)
        !           111: 
        !           112:        lwz     r3,     CTHREAD_SELF(r1)
        !           113:        mtsprg  3,      r3
        !           114: 
        !           115: 
        !           116:        /* Prepare to rfi to the exception exit routine, which is
        !           117:         * in physical address space */
        !           118:        addis   r3,     0,      HIGH_CADDR(EXT(exception_exit))
        !           119:        addi    r3,     r3,     LOW_ADDR(EXT(exception_exit))
        !           120:        lwz     r3,     0(r3)
        !           121:        mtsrr0  r3
        !           122:        li      r3,     MSR_VM_OFF
        !           123:        mtsrr1  r3
        !           124: 
        !           125:        lwz     r3,     PP_SAVE_SRR1(r2)        /* load the last register... */
        !           126:        lwz     r2,     PP_SAVE_SRR0(r2)        /* For trampoline */
        !           127:        lwz     r1,     PCB_SR0(r1)             /* For trampoline... */
        !           128: 
        !           129:        rfi

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