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Annotation of kernel/machdep/ppc/pcb.c, 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: /*     HISTORY
        !            26: 
        !            27:        1997/05/16      Rene Vega -- cleanup sync/isync usage.
        !            28: */
        !            29: 
        !            30: #import <machdep/ppc/exception.h>
        !            31: #import <mach/mach_types.h>
        !            32: #import <kern/mach_param.h>
        !            33: #import <kern/thread.h>
        !            34: #import <kern/kernel_stack.h>
        !            35: #import <machdep/ppc/thread.h>
        !            36: #import <bsd/ppc/psl.h>
        !            37: #import <sys/time.h>
        !            38: #import <bsd/ppc/vmparam.h>
        !            39: #import <kernserv/ppc/spl.h>
        !            40: #import <sys/param.h>
        !            41: #import <sys/proc.h>
        !            42: #import <kern/parallel.h>
        !            43: #include <machdep/ppc/proc_reg.h>
        !            44: #include <ppc/trap.h>
        !            45: #ifdef KDEBUG
        !            46: #include <kern/kdebug.h>
        !            47: #include <mach_counters.h>
        !            48: #include <kern/counters.h>
        !            49: #import <machdep/ppc/frame.h>
        !            50: #endif
        !            51: #import <machdep/ppc/asm.h>
        !            52: #import <assym.h>
        !            53: 
        !            54: pcb_t active_pcbs[NCPUS];      /* PCB belonging to the active thread */
        !            55: 
        !            56: #if DEBUG
        !            57: int    fpu_trap_count = 0;
        !            58: int    fpu_switch_count = 0;
        !            59: #endif
        !            60: 
        !            61: extern struct per_proc_info per_proc_info[];
        !            62: 
        !            63: #define current_pcb() active_pcbs[cpu_number()]
        !            64: 
        !            65: zone_t          pcb_zone;
        !            66: 
        !            67: /*
        !            68:  * Initialize pcb allocation zone.
        !            69:  */
        !            70: void
        !            71: pcb_module_init(void)
        !            72: {
        !            73:        int i;
        !            74:     pcb_zone = zinit(
        !            75:                     sizeof (struct pcb),
        !            76:                     THREAD_MAX * sizeof (struct pcb),
        !            77:                     THREAD_CHUNK * sizeof (struct pcb),
        !            78:                     FALSE, "pcb");
        !            79: 
        !            80:        for (i=0; i < NCPUS; i++) {
        !            81:                active_pcbs[i] = 0;
        !            82:        }
        !            83: }
        !            84: 
        !            85: /*
        !            86:  * Allocated and initialize a pcb for a new thread.
        !            87:  */
        !            88: void pcb_init(thread_t  thread)
        !            89: {
        !            90:         struct pcb      *pcb = (void *)zalloc(pcb_zone);
        !            91:        pmap_t pmap = thread->task->map->pmap;
        !            92: 
        !            93: 
        !            94:         thread->pcb = pcb;
        !            95: 
        !            96:        /* all fields default to zero */
        !            97:         bzero((caddr_t)pcb, sizeof (struct pcb));
        !            98: 
        !            99:        /*
        !           100:         * User threads will pull their context from the pcb when first
        !           101:         * returning to user mode, so fill in all the necessary values.
        !           102:         * Kernel threads are initialized from the save state structure 
        !           103:         * at the base of the kernel stack (see stack_attach()).
        !           104:         */
        !           105: 
        !           106:        pcb->ss.srr1 = MSR_EXPORT_MASK_SET;
        !           107: 
        !           108:        pcb->sr0     = SEG_REG_PROT | (pmap->space<<4);
        !           109:        pcb->ss.sr_copyin    = SEG_REG_PROT | SR_COPYIN + (pmap->space<<4);
        !           110: }
        !           111: 
        !           112: /*
        !           113:  * Release machine dependent resources on
        !           114:  * thread termination.
        !           115:  */
        !           116: pcb_terminate(
        !           117:     thread_t    thread
        !           118: )
        !           119: {
        !           120:        struct pcb      *pcb = thread->pcb;
        !           121: 
        !           122: 
        !           123:        if (per_proc_info[cpu_number()].fpu_pcb == pcb)
        !           124:        {
        !           125:                per_proc_info[cpu_number()].fpu_pcb = (pcb_t)0;
        !           126:        }
        !           127: 
        !           128:         thread->pcb = 0;
        !           129:         zfree(pcb_zone, pcb);
        !           130: }
        !           131: 
        !           132: #define KF_SIZE                (FM_SIZE+ARG_SIZE+FM_REDZONE)
        !           133: 
        !           134: /*
        !           135:  * stack_attach: Attach a kernel stack to a thread.
        !           136:  */
        !           137: void stack_attach(thread, stack, continuation)
        !           138:         register thread_t       thread;
        !           139:         vm_offset_t             stack;
        !           140:         void                    (*continuation)();
        !           141: {
        !           142:        struct ppc_kernel_state *kss;
        !           143:         struct pcb      *pcb = thread->pcb;
        !           144: 
        !           145: #ifdef KDEBUG
        !           146:        if (continuation) {
        !           147:                KERNEL_DEBUG(MACHDBG_CODE(DBG_MACH_SCHED,MACH_STACK_ATTACH),
        !           148:                        thread, thread->priority,
        !           149:                        thread->sched_pri, continuation, 
        !           150:                        0);
        !           151:        }
        !           152: #endif
        !           153:        thread->kernel_stack = stack;
        !           154:        kss = STACK_IKS(stack);
        !           155: 
        !           156:        /*
        !           157:         * Build a kernel state area + arg frame on the stack for the initial
        !           158:         * switch into the thread. We also store a zero into the kernel
        !           159:         * stack pointer so the trap code knows there is already a frame
        !           160:         * on the kernel stack.
        !           161:         */
        !           162: 
        !           163:        kss->lr = (unsigned int) continuation;
        !           164:        kss->r1 = (vm_offset_t) ((int)kss - KF_SIZE);
        !           165: 
        !           166:        *((int*)kss->r1) = 0;       /* Zero the frame backpointer */
        !           167: 
        !           168:         pcb->ksp = 0;
        !           169: }
        !           170: 
        !           171: vm_offset_t
        !           172: stack_detach(
        !           173:     thread_t            thread
        !           174: )
        !           175: {
        !           176:     vm_offset_t         stack;
        !           177: 
        !           178:     stack = thread->kernel_stack;
        !           179:     thread->kernel_stack = 0;
        !           180: 
        !           181:     return (stack);
        !           182: }
        !           183: 
        !           184: /*
        !           185:  * stack_handoff: Move the current threads kernel stack to the new thread.
        !           186:  */
        !           187: void
        !           188: stack_handoff(
        !           189:     thread_t           old,
        !           190:     thread_t           new
        !           191: )
        !           192: {
        !           193:     vm_offset_t                stack = stack_detach(old);
        !           194: 
        !           195:    KERNEL_DEBUG(MACHDBG_CODE(DBG_MACH_SCHED,MACH_STACK_HANDOFF),
        !           196:        old, new, 
        !           197:        old->priority, old->sched_pri, 
        !           198:        new->sched_pri);
        !           199: 
        !           200:     stack_attach(new, stack, 0);
        !           201: 
        !           202:     /*
        !           203:      * Change software state.
        !           204:      */
        !           205:     if (new->task != old->task) {
        !           206:        int             mycpu = cpu_number();
        !           207: 
        !           208:        PMAP_DEACTIVATE(vm_map_pmap(old->task->map), old, mycpu);
        !           209:        PMAP_ACTIVATE(vm_map_pmap(new->task->map), new, mycpu);
        !           210:        pmap_switch(new->task->map->pmap);
        !           211:     }
        !           212: 
        !           213:     // current_thread() = new; // can't use this because it may be inlined!
        !           214:     cpu_data[cpu_number()].active_thread = new;
        !           215:     current_pcb() = new->pcb;
        !           216:     cpu_data[cpu_number()].flags = new->pcb->flags;
        !           217: 
        !           218: #if NCPUS > 1
        !           219:        /* There is no free lunch!
        !           220:         * save the floating point state for the old thread
        !           221:         * if the fpu has been used since the last context switch
        !           222:         */
        !           223:        fp_state_save(old);
        !           224:        
        !           225: #endif /* NCPUS > 1 */
        !           226: 
        !           227:        new->pcb->ksp = 0;
        !           228: 
        !           229: }
        !           230: 
        !           231: void
        !           232: call_continuation(
        !           233:     void            (*continuation)(void)
        !           234: )
        !           235: {
        !           236:        struct ppc_kernel_state *kss;
        !           237:     extern Call_continuation();
        !           238:        int tkss;
        !           239: 
        !           240: 
        !           241:        KERNEL_DEBUG(MACHDBG_CODE(DBG_MACH_SCHED,MACH_CALL_CONT),
        !           242:                        current_thread(), current_thread()->priority, 
        !           243:                        current_thread()->sched_pri, continuation, 
        !           244:                        0);
        !           245: 
        !           246:        kss = STACK_IKS(current_thread()->kernel_stack);
        !           247: 
        !           248:        *((int*)((int)kss - KF_SIZE)) = 0;       /* Zero the frame backpointer */
        !           249:        tkss = (int)kss - KF_SIZE;
        !           250: 
        !           251:     Call_continuation(continuation, tkss);
        !           252: }
        !           253: 
        !           254: 
        !           255: /*
        !           256:  * switch_context: Switch from one thread to another.
        !           257:  */
        !           258: thread_t
        !           259: switch_context(
        !           260:     thread_t           old,
        !           261:     void               (*continuation)(void),
        !           262:     thread_t           new
        !           263: )
        !           264: {
        !           265:     thread_t ret_thread;
        !           266:     extern thread_t Switch_context();
        !           267: #ifdef KDEBUG
        !           268:     struct linkage_area *frame_ptr;
        !           269:     uint i;
        !           270:     uint lr[4];
        !           271: #endif
        !           272: 
        !           273:     if (new->task != old->task) {
        !           274:        int             mycpu = cpu_number();
        !           275: 
        !           276:        PMAP_DEACTIVATE(vm_map_pmap(old->task->map), old, mycpu);
        !           277:        PMAP_ACTIVATE(vm_map_pmap(new->task->map), new, mycpu);
        !           278: 
        !           279:        pmap_switch(new->task->map->pmap);
        !           280:     }
        !           281:        
        !           282:     // current_thread() = new; // can't use this because it may be inlined!
        !           283:     cpu_data[cpu_number()].active_thread = new;
        !           284:     //current_stack() = new->kernel_stack; // assembly does this
        !           285:     current_pcb()= new->pcb;
        !           286:     cpu_data[cpu_number()].flags = new->pcb->flags;
        !           287: 
        !           288: #if NCPUS > 1
        !           289:        /* There is no free lunch!
        !           290:         * Save the floating point state for the old thread
        !           291:         * if the fpu has been used since the last context switch.
        !           292:         * Otherwise we need to broadcast an interrupt to the
        !           293:         * old fpu to get the state.
        !           294:         */
        !           295:        fp_state_save(old);
        !           296: 
        !           297: #else
        !           298:        //disable_fpu();
        !           299: #endif 
        !           300: 
        !           301: #ifdef KDEBUG
        !           302:        KERNEL_DEBUG(MACHDBG_CODE(DBG_MACH_SCHED,MACH_SCHED) | DBG_FUNC_END,
        !           303:                        old, new, 
        !           304:                        old->priority, old->sched_pri, 
        !           305:                        new->sched_pri);
        !           306: 
        !           307:        frame_ptr = STACK_IKS(new->kernel_stack)->r1;
        !           308:        lr[0] = lr[1] = lr[2] = lr[3] = 0;
        !           309:        lr[0] = STACK_IKS(new->kernel_stack)->lr;
        !           310:        for (i=1;i<4;i++) {
        !           311:          if (frame_ptr == NULL) break;
        !           312:          lr[i] = frame_ptr->saved_lr;
        !           313:          frame_ptr = frame_ptr->saved_sp;
        !           314:        }
        !           315:        KERNEL_DEBUG(MACHDBG_CODE(DBG_MACH_SCHED,MACH_SCHED) | DBG_FUNC_START,
        !           316:                        new, lr[0], lr[1], lr[2], lr[3]); 
        !           317: 
        !           318:        lr[0] = lr[1] = lr[2] = lr[3] = 0;
        !           319:        for (i=0;i<4;i++) {
        !           320:          if (frame_ptr == NULL) break;
        !           321:          lr[i] = frame_ptr->saved_lr;
        !           322:          frame_ptr = frame_ptr->saved_sp;
        !           323:        }
        !           324:        if (lr[0]) {
        !           325:                KERNEL_DEBUG(MACHDBG_CODE(DBG_MACH_SCHED,MACH_SCHED),
        !           326:                        0, lr[0], lr[1], lr[2], lr[3]);
        !           327:        };
        !           328: #endif
        !           329:        ret_thread = Switch_context(old, continuation, new);
        !           330: 
        !           331:        return(ret_thread);
        !           332: }
        !           333: 
        !           334: void
        !           335: start_initial_context(
        !           336:     thread_t            thread
        !           337: )
        !           338: {
        !           339:     struct pcb          *pcb = thread->pcb;
        !           340: 
        !           341:     /*
        !           342:      * Change software state.
        !           343:      */
        !           344: 
        !           345:    PMAP_ACTIVATE(vm_map_pmap(thread->task->map), thread, 0);
        !           346: 
        !           347: // current_thread() = thread; // can't use this because it may be inlined!
        !           348:    cpu_data[cpu_number()].active_thread = thread;
        !           349:    current_stack() = thread->kernel_stack;
        !           350:    current_pcb() = thread->pcb;
        !           351:    cpu_data[cpu_number()].flags = thread->pcb->flags;
        !           352: 
        !           353:     /*
        !           354:      * Change hardware state
        !           355:      */
        !           356:     load_context(thread);
        !           357:     /*NOTREACHED*/
        !           358: }
        !           359: 
        !           360: /*
        !           361:  * Duplicate parent state in child
        !           362:  * for U**X fork.
        !           363:  */
        !           364: thread_dup(
        !           365:     thread_t           parent,
        !           366:     thread_t           child
        !           367: )
        !           368: {
        !           369:        struct ppc_saved_state  *parent_state, *child_state;
        !           370:        struct ppc_float_state  *parent_float_state, *child_float_state;
        !           371:        struct ppc_exception_state      *parent_exception_state,
        !           372:                                        *child_exception_state;
        !           373: 
        !           374:        /* Save the FPU state */
        !           375:        if (per_proc_info[cpu_number()].fpu_pcb == parent->pcb) {
        !           376:                fp_state_save(parent);
        !           377:        }
        !           378: 
        !           379:        parent_state = &parent->pcb->ss;
        !           380:        child_state = &child->pcb->ss;
        !           381: 
        !           382:        /* rely on compiler structure assignment */
        !           383:        *child_state = *parent_state;
        !           384: 
        !           385:        parent_float_state = &parent->pcb->fs;
        !           386:        child_float_state = &child->pcb->fs;
        !           387: 
        !           388:        /* rely on compiler structure assignment */
        !           389:        *child_float_state = *parent_float_state;
        !           390: #if 0
        !           391:        parent_exception_state = &parent->pcb->es;
        !           392:        child_exception_state = &child->pcb->es;
        !           393: 
        !           394:        /* rely on compiler structure assignment */
        !           395:        *child_exception_state = *parent_exception_state;
        !           396: #endif
        !           397:        child_state->r3 = child->task->proc->p_pid;
        !           398:        child_state->r4 = 1;
        !           399: 
        !           400:        child_state->sr_copyin = child->pcb->sr0 + SR_COPYIN;
        !           401: }
        !           402: 
        !           403: /*
        !           404:  * Set thread integer state
        !           405:  */
        !           406: kern_return_t
        !           407: set_thread_state(
        !           408:     thread_t                   thread,
        !           409:     thread_state_t             tstate,
        !           410:     unsigned int               count
        !           411: )
        !           412: {
        !           413:        struct ppc_saved_state  *saved_state;
        !           414:        struct ppc_thread_state *state;
        !           415:     
        !           416:        if (count < PPC_THREAD_STATE_COUNT)
        !           417:                return (KERN_INVALID_ARGUMENT);
        !           418:        
        !           419:        if (thread->task->kernel_privilege) {
        !           420:                /*
        !           421:                * State for kernel threads
        !           422:                * can only be set before thread
        !           423:                * is first started.
        !           424:                *
        !           425:                * XXX This hack is due to the
        !           426:                * fact that the &^%$#@! kernel loader
        !           427:                * uses the thread_set_state() call to
        !           428:                * start a thread in kernel mode.
        !           429:                */
        !           430:                if (thread->swap_func != thread_bootstrap_return)
        !           431:                        return (KERN_INVALID_ARGUMENT);
        !           432:        }
        !           433: 
        !           434:        state = (struct ppc_thread_state *)tstate;
        !           435:        saved_state = &thread->pcb->ss;
        !           436: 
        !           437:        /*
        !           438:        * structure assignment - depends on 
        !           439:        * ppc_thread_state being a prefix of ppc_saved_state !
        !           440:        */
        !           441: 
        !           442:        *((struct ppc_thread_state *)saved_state) = *state;
        !           443: 
        !           444:        saved_state->sr_copyin = thread->pcb->sr0 + SR_COPYIN;
        !           445: 
        !           446:        saved_state->srr1 |= MSR_EXPORT_MASK_SET;
        !           447: 
        !           448:        if (thread->task->kernel_privilege) {
        !           449:                saved_state->srr1 &= ~ MASK(MSR_PR);
        !           450:                thread_start(thread, state->srr0);
        !           451:        }
        !           452: 
        !           453:        return (KERN_SUCCESS);
        !           454: }
        !           455: 
        !           456: /*
        !           457:  * Set thread floating point state
        !           458:  */
        !           459: kern_return_t
        !           460: set_thread_fpstate(
        !           461:     thread_t                   thread,
        !           462:     thread_state_t             tstate,
        !           463:     unsigned int               count
        !           464: )
        !           465: {
        !           466:        struct ppc_float_state  *state;
        !           467:     
        !           468:        if (count < PPC_FLOAT_STATE_COUNT)
        !           469:                return (KERN_INVALID_ARGUMENT);
        !           470: 
        !           471:        fpu_save();
        !           472:        fpu_disable();
        !           473: 
        !           474:        state = (struct ppc_float_state *)tstate;
        !           475: 
        !           476:        /* structure assignment */
        !           477:        thread->pcb->fs = *state;
        !           478:     
        !           479:        return (KERN_SUCCESS);
        !           480: }
        !           481: 
        !           482: /*
        !           483:  * Set thread exception point state
        !           484:  */
        !           485: kern_return_t
        !           486: set_thread_exstate(
        !           487:     thread_t                   thread,
        !           488:     thread_state_t             tstate,
        !           489:     unsigned int               count
        !           490: )
        !           491: {
        !           492:        struct ppc_exception_state      *state;
        !           493:     
        !           494:        if (count < PPC_EXCEPTION_STATE_COUNT)
        !           495:                return (KERN_INVALID_ARGUMENT);
        !           496: 
        !           497:        state = (struct ppc_exception_state *)tstate;
        !           498: 
        !           499:        /* structure assignment */
        !           500:        thread->pcb->es = *state;
        !           501:     
        !           502:        return (KERN_SUCCESS);
        !           503: }
        !           504: 
        !           505: /*
        !           506:  * Set externally visible thread
        !           507:  * state.
        !           508:  */
        !           509: kern_return_t
        !           510: thread_setstatus(
        !           511:     thread_t                   thread,
        !           512:     int                                flavor,
        !           513:     thread_state_t             tstate,
        !           514:     unsigned int               count
        !           515: )
        !           516: {
        !           517:     switch (flavor) {
        !           518: 
        !           519:     case PPC_THREAD_STATE:
        !           520:        return (set_thread_state(thread, tstate, count));
        !           521:     
        !           522:     case PPC_FLOAT_STATE:
        !           523:        return (set_thread_fpstate(thread, tstate, count));
        !           524: 
        !           525:     case PPC_EXCEPTION_STATE:
        !           526:        return (set_thread_exstate(thread, tstate, count));
        !           527: 
        !           528:     default:
        !           529:        return (KERN_INVALID_ARGUMENT);
        !           530:     }
        !           531: }
        !           532: 
        !           533: /*
        !           534:  * Get thread state flavor list
        !           535:  */
        !           536: kern_return_t
        !           537: get_thread_state_flavor_list(
        !           538:     thread_state_t             tstate,
        !           539:     unsigned int               *count
        !           540: )
        !           541: {
        !           542:        struct thread_state_flavor *state;
        !           543: 
        !           544:        if (*count < PPC_THREAD_STATE_FLAVOR_LIST_COUNT)
        !           545:                return (KERN_INVALID_ARGUMENT);
        !           546:        
        !           547:        state = (struct thread_state_flavor *)tstate;
        !           548: 
        !           549:        state->flavor = PPC_THREAD_STATE;
        !           550:        state->count = PPC_THREAD_STATE_COUNT;
        !           551:     
        !           552:        (++state)->flavor = PPC_FLOAT_STATE;
        !           553:        state->count = PPC_FLOAT_STATE_COUNT;
        !           554:     
        !           555:        (++state)->flavor = PPC_EXCEPTION_STATE;
        !           556:        state->count = PPC_EXCEPTION_STATE_COUNT;
        !           557:     
        !           558:        *count = PPC_THREAD_STATE_FLAVOR_LIST_COUNT;
        !           559:     
        !           560:        return (KERN_SUCCESS);
        !           561: }
        !           562: 
        !           563: /*
        !           564:  * Get thread integer state
        !           565:  */
        !           566: kern_return_t
        !           567: get_thread_state(
        !           568:     thread_t                   thread,
        !           569:     thread_state_t             tstate,
        !           570:     unsigned int               *count
        !           571: )
        !           572: {
        !           573:        struct ppc_thread_state *saved_state;
        !           574:        struct ppc_thread_state *state;
        !           575:     
        !           576:        if (*count < PPC_THREAD_STATE_COUNT)
        !           577:                return (KERN_INVALID_ARGUMENT);
        !           578:        
        !           579:        state = (struct ppc_thread_state *)tstate;
        !           580:        saved_state = (struct ppc_thread_state *) &thread->pcb->ss;
        !           581: 
        !           582:        /*
        !           583:         * structure assignment - depends on 
        !           584:         * ppc_thread_state being a prefix of ppc_saved_state !
        !           585:         */
        !           586:        *state = *((struct ppc_thread_state *)saved_state);
        !           587: 
        !           588:        *count = PPC_THREAD_STATE_COUNT;
        !           589:     
        !           590:        return (KERN_SUCCESS);
        !           591: }
        !           592: 
        !           593: /*
        !           594:  * Get thread floating point state
        !           595:  */
        !           596: kern_return_t
        !           597: get_thread_fpstate(
        !           598:     thread_t                   thread,
        !           599:     thread_state_t             tstate,
        !           600:     unsigned int               *count
        !           601: )
        !           602: {
        !           603:        struct ppc_float_state  *state;
        !           604:     
        !           605:        if (*count < PPC_FLOAT_STATE_COUNT)
        !           606:                return (KERN_INVALID_ARGUMENT);
        !           607: 
        !           608:        fpu_save();
        !           609:        fpu_disable();
        !           610: 
        !           611:        state = (struct ppc_float_state *)tstate;
        !           612: 
        !           613:        /* structure assignment */
        !           614:        *state = thread->pcb->fs;
        !           615: 
        !           616:        *count = PPC_FLOAT_STATE_COUNT;
        !           617:     
        !           618:        return (KERN_SUCCESS);
        !           619: }
        !           620: 
        !           621: /*
        !           622:  * Get thread exception point state
        !           623:  */
        !           624: kern_return_t
        !           625: get_thread_exstate(
        !           626:     thread_t                   thread,
        !           627:     thread_state_t             tstate,
        !           628:     unsigned int               *count
        !           629: )
        !           630: {
        !           631:        struct ppc_exception_state      *state;
        !           632:     
        !           633:        if (*count < PPC_EXCEPTION_STATE_COUNT)
        !           634:                return (KERN_INVALID_ARGUMENT);
        !           635: 
        !           636:        state = (struct ppc_exception_state *)tstate;
        !           637: 
        !           638:        /* structure assignment */
        !           639:        *state = thread->pcb->es;
        !           640: 
        !           641:        *count = PPC_EXCEPTION_STATE_COUNT;
        !           642:     
        !           643:        return (KERN_SUCCESS);
        !           644: }
        !           645: 
        !           646: /*
        !           647:  * Return externally visible
        !           648:  * thread status.
        !           649:  */
        !           650: kern_return_t
        !           651: thread_getstatus(
        !           652:     thread_t                   thread,
        !           653:     int                                flavor,
        !           654:     thread_state_t             tstate,
        !           655:     unsigned int               *count
        !           656: )
        !           657: {
        !           658:     switch (flavor) {
        !           659: 
        !           660:        case THREAD_STATE_FLAVOR_LIST:
        !           661:                return (get_thread_state_flavor_list(tstate, count));
        !           662: 
        !           663:        case PPC_THREAD_STATE:
        !           664:                return (get_thread_state(thread, tstate, count));
        !           665:        
        !           666:        case PPC_FLOAT_STATE:
        !           667:                return (get_thread_fpstate(thread, tstate, count));
        !           668:        
        !           669:        case PPC_EXCEPTION_STATE:
        !           670:                return (get_thread_exstate(thread, tstate, count));
        !           671:        
        !           672:        default:
        !           673:                return (KERN_INVALID_ARGUMENT);
        !           674:     }
        !           675: }
        !           676: 
        !           677: /*
        !           678:  * thread_userstack:
        !           679:  *
        !           680:  * Return the user stack pointer from the machine 
        !           681:  * dependent thread state info.
        !           682:  */
        !           683: kern_return_t
        !           684: thread_userstack(
        !           685:     thread_t           thread,
        !           686:     int                        flavor,
        !           687:     thread_state_t     tstate,
        !           688:     unsigned int       count,
        !           689:     vm_offset_t                *user_stack
        !           690: )
        !           691: {
        !           692:        struct ppc_thread_state *state;
        !           693: 
        !           694:        /*
        !           695:         * Set a default.
        !           696:         */
        !           697:        if (*user_stack == 0)
        !           698:                *user_stack = USRSTACK;
        !           699:                
        !           700:        switch (flavor) {
        !           701:        case PPC_THREAD_STATE:
        !           702:                if (count < PPC_THREAD_STATE_COUNT)
        !           703:                        return (KERN_INVALID_ARGUMENT);
        !           704: 
        !           705:                state = (struct ppc_thread_state *) tstate;
        !           706: 
        !           707:                /*
        !           708:                 * If a valid user stack is specified, use it.
        !           709:                 */
        !           710:                *user_stack = state->r1 ? state->r1: USRSTACK;
        !           711:                break;
        !           712:        default :
        !           713:                return (KERN_INVALID_ARGUMENT);
        !           714:        }
        !           715: 
        !           716:        return (KERN_SUCCESS);
        !           717: }
        !           718: 
        !           719: kern_return_t
        !           720: thread_entrypoint(
        !           721:     thread_t           thread,
        !           722:     int                        flavor,
        !           723:     thread_state_t     tstate,
        !           724:     unsigned int       count,
        !           725:     vm_offset_t                *entry_point
        !           726: )
        !           727: {
        !           728:     struct ppc_thread_state    *state;
        !           729: 
        !           730:     /*
        !           731:      * Set a default.
        !           732:      */
        !           733:     if (*entry_point == 0)
        !           734:        *entry_point = VM_MIN_ADDRESS;
        !           735:                
        !           736:     switch (flavor) {
        !           737: 
        !           738:     case PPC_THREAD_STATE:
        !           739:        if (count < PPC_THREAD_STATE_COUNT)
        !           740:            return (KERN_INVALID_ARGUMENT);
        !           741: 
        !           742:        state = (struct ppc_thread_state *) tstate;
        !           743: 
        !           744:        /*
        !           745:         * If a valid entry point is specified, use it.
        !           746:         */
        !           747:        *entry_point = state->srr0 ? state->srr0: VM_MIN_ADDRESS;
        !           748:        break;
        !           749:     default:
        !           750:        return (KERN_INVALID_ARGUMENT);
        !           751:     }
        !           752: 
        !           753:     return (KERN_SUCCESS);
        !           754: }
        !           755: 
        !           756: 
        !           757: void __volatile__
        !           758: thread_syscall_return(
        !           759:        kern_return_t   retval)
        !           760: {
        !           761:        thread_t        thread = current_thread();
        !           762:        struct ppc_saved_state *ssp = &thread->pcb->ss;
        !           763: 
        !           764:        ssp->r3 = retval;
        !           765: 
        !           766:        thread_exception_return();
        !           767:        /* NOTREACHED */
        !           768: }
        !           769: 
        !           770: void
        !           771: thread_set_syscall_return(
        !           772:        thread_t        thread,
        !           773:        kern_return_t   retval)
        !           774: {
        !           775:        struct ppc_saved_state *ssp = &thread->pcb->ss;
        !           776: 
        !           777:        ssp->r3 = retval;
        !           778: }
        !           779: 
        !           780: void
        !           781: pmap_switch(pmap_t map)
        !           782: {
        !           783:        unsigned int i;
        !           784: 
        !           785:        if (map->space == PPC_SID_KERNEL)
        !           786:                return;
        !           787: 
        !           788:        /* sr value has Ks=1, Ku=1, and vsid composed of space+seg num */
        !           789:        i = SEG_REG_PROT | (map->space << 4);
        !           790: 
        !           791:        isync();                /* context sync before */
        !           792: /*     mtsr(0x0, i + 0x0); SR0 is part of the kernel address space */
        !           793: /*     mtsr(0x1, i + 0x1); SR1 is part of the kernel address space */
        !           794: /*     mtsr(0x2, i + 0x2); SR2 is part of the kernel address space */
        !           795: /*     mtsr(0x3, i + 0x3); SR3 is part of the kernel address space */
        !           796:        mtsr(0x4, i + 0x4);
        !           797:        mtsr(0x5, i + 0x5);
        !           798:        mtsr(0x6, i + 0x6);
        !           799:        mtsr(0x7, i + 0x7);
        !           800:        mtsr(0x8, i + 0x8);
        !           801:        mtsr(0x9, i + 0x9);
        !           802:        mtsr(0xa, i + 0xa);
        !           803:        mtsr(0xb, i + 0xb);
        !           804:        mtsr(0xc, i + 0xc);
        !           805:        mtsr(0xd, i + 0xd);
        !           806:        mtsr(0xe, i + 0xe);
        !           807:        mtsr(0xf, i + 0xf);
        !           808:        isync();                /* context sync after */
        !           809: }
        !           810: 
        !           811: /*
        !           812:  * task_map_io_ports() is required by the driverkit routines.
        !           813:  */
        !           814: kern_return_t
        !           815: task_map_io_ports(
        !           816:     task_t             task,
        !           817:     unsigned int       port,
        !           818:     unsigned int       length,
        !           819:     boolean_t          unmap
        !           820: )
        !           821: {
        !           822:        return (KERN_SUCCESS);
        !           823: }
        !           824: 
        !           825: 
        !           826: #if MACH_ASSERT
        !           827: void
        !           828: dump_pcb(pcb_t pcb)
        !           829: {
        !           830:        printf("pcb @ %8.8x:\n", pcb);
        !           831:        printf("ksp       = 0x%08x\n\n",pcb->ksp);
        !           832: #if DEBUG
        !           833:        regDump(&pcb->ss);
        !           834: #endif /* DEBUG */
        !           835: }
        !           836: 
        !           837: void
        !           838: dump_thread(thread_t th)
        !           839: {
        !           840:        printf(" thread @ 0x%x:\n", th);
        !           841: }
        !           842: #endif

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