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Annotation of XNU/osfmk/ppc/thread_act.h, 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: 
        !            27: #ifndef        _PPC_THREAD_ACT_H_
        !            28: #define        _PPC_THREAD_ACT_H_
        !            29: 
        !            30: #include <mach_kgdb.h>
        !            31: #include <mach/boolean.h>
        !            32: #include <mach/ppc/vm_types.h>
        !            33: #include <mach/thread_status.h>
        !            34: #include <kern/lock.h>
        !            35: 
        !            36: 
        !            37: /*
        !            38:  * Kernel state structure
        !            39:  *
        !            40:  * This holds the kernel state that is saved and restored across context
        !            41:  * switches. This is kept at the top of the kernel stack.
        !            42:  *
        !            43:  * XXX Some state is saved only because it is not saved on entry to the
        !            44:  * kernel from user mode. This needs to be straightened out.
        !            45:  */
        !            46: 
        !            47: /*
        !            48:  * PPC process control block
        !            49:  *
        !            50:  * In the continuation model, the PCB holds the user context. It is used
        !            51:  * on entry to the kernel from user mode, either by system call or trap,
        !            52:  * to store the necessary user registers and other state.
        !            53:  *
        !            54:  *     Note that this structure overlays a savearea.  Make sure that these
        !            55:  *     guys are updated in concert with that.
        !            56:  */
        !            57: struct pcb
        !            58: {
        !            59:        struct ppc_saved_state ss;
        !            60:        struct ppc_exception_state es;
        !            61:        struct ppc_float_state fs;
        !            62:        unsigned int gas1[6];                           /* Force alignment with savearea */
        !            63:        struct ppc_vector_state vec;
        !            64: 
        !            65: };
        !            66: 
        !            67: typedef struct pcb *pcb_t;
        !            68: 
        !            69: /*
        !            70:  * Maps state flavor to number of words in the state:
        !            71:  */
        !            72: extern unsigned int state_count[];
        !            73: 
        !            74: #define USER_REGS(ThrAct)      (&(ThrAct)->mact.pcb->ss)
        !            75: 
        !            76: #define        user_pc(ThrAct)         ((ThrAct)->mact.pcb->ss.srr0)
        !            77: 
        !            78: #define act_machine_state_ptr(ThrAct)  (thread_state_t)USER_REGS(ThrAct)
        !            79: 
        !            80: typedef struct MachineThrAct {
        !            81:        /*
        !            82:         * pointer to process control block control blocks.  Potentially
        !            83:         * one for each active facility context.  They may point to the
        !            84:         * same saveareas.
        !            85:         */
        !            86:        pcb_t                   pcb;                    /* The "normal" savearea */
        !            87:        pcb_t                   FPU_pcb;                /* The floating point savearea */
        !            88:        pcb_t                   FPU_lvl;                /* The floating point context level */
        !            89:        unsigned int    FPU_cpu;                /* The last processor to enable floating point */
        !            90:        pcb_t                   VMX_pcb;                /* The VMX savearea */
        !            91:        pcb_t                   VMX_lvl;                /* The VMX context level */
        !            92:        unsigned int    VMX_cpu;                /* The last processor to enable vector */
        !            93:        unsigned int    ksp;                    /* points to TOP OF STACK or zero */
        !            94:        unsigned int    bbDescAddr;             /* Points to Blue Box descriptor area in kernel (page aligned) */
        !            95:        unsigned int    bbUserDA;               /* Points to Blue Box descriptor area in user (page aligned) */
        !            96:        unsigned int    bbTableStart;   /* Start of Blue Box trap table start */
        !            97:        unsigned int    bbPendRupt;             /* Number of pending interruptions */
        !            98:        unsigned int    specFlags;              /* Special flags */
        !            99: #define ignoreZeroFault 0x80000000
        !           100: #define floatUsed 0x40000000
        !           101: #define vectorUsed 0x20000000
        !           102: #ifdef MACH_BSD
        !           103:        unsigned long   cthread_self;   /* for use of cthread package */
        !           104: #endif
        !           105: 
        !           106: } MachineThrAct, *MachineThrAct_t;
        !           107: 
        !           108: extern struct ppc_saved_state * find_user_regs(thread_act_t act);
        !           109: extern struct ppc_float_state * find_user_fpu(thread_act_t act);
        !           110: 
        !           111: #endif /* _PPC_THREAD_ACT_H_ */

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