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Annotation of XNU/osfmk/ppc/misc.c, 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: #include <debug.h>
        !            26: #include <mach_debug.h>
        !            27: 
        !            28: #include <mach/ppc/thread_status.h>
        !            29: #include <mach/vm_types.h>
        !            30: #include <kern/thread.h>
        !            31: #include <kern/misc_protos.h>
        !            32: #include <ppc/proc_reg.h>
        !            33: #include <ppc/pmap.h>
        !            34: #include <ppc/misc_protos.h>
        !            35: #include <ppc/exception.h>
        !            36: 
        !            37: /*
        !            38:  * copyin/out_multiple - the assembler copyin/out functions jump to C for
        !            39:  * help when the copyin lies over a segment boundary. The C breaks
        !            40:  * down the copy into two sub-copies and re-calls the assembler with
        !            41:  * these sub-copies. Very rare occurrance. Warning: These functions are
        !            42:  * called whilst active_thread->thread_recover is still set.
        !            43:  */
        !            44: 
        !            45: extern boolean_t copyin_multiple(const char *src,
        !            46:                                 char *dst,
        !            47:                                 vm_size_t count);
        !            48: 
        !            49: boolean_t copyin_multiple(const char *src,
        !            50:                          char *dst,
        !            51:                          vm_size_t count)
        !            52: {
        !            53:        const char *midpoint;
        !            54:        vm_size_t first_count;
        !            55:        boolean_t first_result;
        !            56: 
        !            57:        /* Assert that we've been called because of a segment boundary,
        !            58:         * this function is more expensive than the assembler, and should
        !            59:         * only be called in this difficult case.
        !            60:         */
        !            61:        assert(((vm_offset_t)src & 0xF0000000) !=
        !            62:               ((vm_offset_t)(src + count -1) & 0xF0000000));
        !            63: 
        !            64:        /* TODO NMGS define sensible constants for segments, and apply
        !            65:         * to C and assembler (assembler is much harder)
        !            66:         */
        !            67:        midpoint = (const char*) ((vm_offset_t)(src + count) & 0xF0000000);
        !            68:        first_count = (midpoint - src);
        !            69: 
        !            70:        first_result = copyin(src, dst, first_count);
        !            71:        
        !            72:        /* If there was an error, stop now and return error */
        !            73:        if (first_result != 0)
        !            74:                return first_result;
        !            75: 
        !            76:        /* otherwise finish the job and return result */
        !            77:        return copyin(midpoint, dst + first_count, count-first_count);
        !            78: }
        !            79: 
        !            80: extern int copyout_multiple(const char *src, char *dst, vm_size_t count);
        !            81: 
        !            82: int copyout_multiple(const char *src, char *dst, vm_size_t count)
        !            83: {
        !            84:        char *midpoint;
        !            85:        vm_size_t first_count;
        !            86:        boolean_t first_result;
        !            87: 
        !            88:        /* Assert that we've been called because of a segment boundary,
        !            89:         * this function is more expensive than the assembler, and should
        !            90:         * only be called in this difficult case. For copyout, the
        !            91:         * segment boundary is on the dst
        !            92:         */
        !            93:        assert(((vm_offset_t)dst & 0xF0000000) !=
        !            94:               ((vm_offset_t)(dst + count - 1) & 0xF0000000));
        !            95: 
        !            96:        /* TODO NMGS define sensible constants for segments, and apply
        !            97:         * to C and assembler (assembler is much harder)
        !            98:         */
        !            99:        midpoint = (char *) ((vm_offset_t)(dst + count) & 0xF0000000);
        !           100:        first_count = (midpoint - dst);
        !           101: 
        !           102:        first_result = copyout(src, dst, first_count);
        !           103:        
        !           104:        /* If there was an error, stop now and return error */
        !           105:        if (first_result != 0)
        !           106:                return first_result;
        !           107: 
        !           108:        /* otherwise finish the job and return result */
        !           109: 
        !           110:        return copyout(src + first_count, midpoint, count-first_count);
        !           111: }
        !           112: 
        !           113: int bcmp(
        !           114:        const char      *a,
        !           115:        const char      *b,
        !           116:        vm_size_t       len)
        !           117: {
        !           118:        if (len == 0)
        !           119:                return 0;
        !           120: 
        !           121:        do
        !           122:                if (*a++ != *b++)
        !           123:                        break;
        !           124:        while (--len);  
        !           125: 
        !           126:        return len;
        !           127: } 
        !           128: 
        !           129: #if DEBUG
        !           130: void regDump(struct ppc_saved_state *state)
        !           131: {
        !           132:        int i;
        !           133: 
        !           134:        for (i=0; i<32; i++) {
        !           135:                if ((i % 8) == 0)
        !           136:                        kprintf("\n%4d :",i);
        !           137:                        kprintf(" %08x",*(&state->r0+i));
        !           138:        }
        !           139: 
        !           140:        kprintf("\n");
        !           141:        kprintf("cr        = 0x%08x\t\t",state->cr);
        !           142:        kprintf("xer       = 0x%08x\n",state->xer); 
        !           143:        kprintf("lr        = 0x%08x\t\t",state->lr); 
        !           144:        kprintf("ctr       = 0x%08x\n",state->ctr); 
        !           145:        kprintf("srr0(iar) = 0x%08x\t\t",state->srr0); 
        !           146:        kprintf("srr1(msr) = 0x%08B\n",state->srr1,
        !           147:                    "\x10\x11""EE\x12PR\x13""FP\x14ME\x15""FE0\x16SE\x18"
        !           148:                    "FE1\x19""AL\x1a""EP\x1bIT\x1c""DT");
        !           149:        kprintf("mq        = 0x%08x\t\t",state->mq);
        !           150:        kprintf("sr_copyin = 0x%08x\n",state->sr_copyin);
        !           151:        kprintf("\n");
        !           152: 
        !           153:        /* Be nice - for user tasks, generate some stack trace */
        !           154:        if (state->srr1 & MASK(MSR_PR)) {
        !           155:                char *addr = (char*)state->r1;
        !           156:                unsigned int buf[2];
        !           157:                for (i = 0; i < 8; i++) {
        !           158:                        if (addr == (char*)NULL)
        !           159:                                break;
        !           160:                        if (!copyin(addr,(char*)buf, 2 * sizeof(int))) {
        !           161:                                printf("0x%08x : %08x\n",buf[0],buf[1]);
        !           162:                                addr = (char*)buf[0];
        !           163:                        } else {
        !           164:                                break;
        !           165:                        }
        !           166:                }
        !           167:        }
        !           168: }
        !           169: #endif /* DEBUG */
        !           170: 
        !           171: #ifdef 0
        !           172: /*
        !           173:  * invalidate_cache_for_io
        !           174:  *
        !           175:  * Takes cache of those requests which may require to flush the
        !           176:  * data cache first before invalidation.
        !           177:  */
        !           178: 
        !           179: 
        !           180: void
        !           181: invalidate_cache_for_io(vm_offset_t area, unsigned count, boolean_t phys)
        !           182: {
        !           183:        vm_offset_t aligned_start, aligned_end, end;
        !           184: 
        !           185:        /* For unaligned reads we need to flush any
        !           186:         * unaligned cache lines. We invalidate the
        !           187:         * rest as this is faster
        !           188:         */
        !           189: 
        !           190:        aligned_start = area & ~(CACHE_LINE_SIZE-1);
        !           191:        if (aligned_start != area)
        !           192:                flush_dcache(aligned_start, CACHE_LINE_SIZE, phys);
        !           193: 
        !           194:        end = area + count;
        !           195:        aligned_end = (end & ~(CACHE_LINE_SIZE-1));
        !           196:        if (aligned_end != end)
        !           197:                flush_dcache(aligned_end, CACHE_LINE_SIZE, phys);
        !           198: 
        !           199:        invalidate_dcache(area, count, phys);
        !           200: }
        !           201: 
        !           202: extern void tracecopyin(unsigned int src, unsigned int dest, unsigned int lgn, unsigned int from);
        !           203: void tracecopyin(unsigned int src, unsigned int dest, unsigned int lgn, unsigned int from) {
        !           204:        
        !           205:        spl_t                                   spl;
        !           206: 
        !           207:        spl = splhigh();
        !           208:        printf("Copy in called from %08X: src=%08X; dest=%08X; lgn=%08X\n", from, src, dest, lgn);
        !           209:        splx(spl);
        !           210:        return;
        !           211: }
        !           212: 
        !           213: extern void tracecopyout(unsigned int src, unsigned int dest, unsigned int lgn, unsigned int from);
        !           214: void tracecopyout(unsigned int src, unsigned int dest, unsigned int lgn, unsigned int from) {
        !           215: 
        !           216:        spl_t                                   spl;
        !           217: 
        !           218:        spl = splhigh();
        !           219:        printf("Copy out called from %08X: src=%08X; dest=%08X; lgn=%08X\n", from, src, dest, lgn);
        !           220:        splx(spl);
        !           221:        return;
        !           222: }
        !           223: 
        !           224: extern void tracecopystr(unsigned int src, unsigned int dest, unsigned int max, 
        !           225:        unsigned int lgn, unsigned int from);
        !           226: void tracecopystr(unsigned int src, unsigned int dest, unsigned int max,
        !           227:        unsigned int lgn, unsigned int from) {
        !           228: 
        !           229:        spl_t                                   spl;
        !           230: 
        !           231:        spl = splhigh();
        !           232:        printf("Copy in string called from %08X: src=%08X; dest=%08X; max=%08X; lgnadr=%08X\n", 
        !           233:                from, src, dest, max, lgn);
        !           234:        splx(spl);
        !           235:        return;
        !           236: }
        !           237: 
        !           238: unsigned int ExceptionTrace = 0;
        !           239: extern void ExceptionTracePrint(struct savearea *sv, int type);
        !           240: void ExceptionTracePrint(struct savearea *sv, int type) {
        !           241: 
        !           242:        spl_t                                   spl;
        !           243: 
        !           244:        spl = splhigh();
        !           245:        
        !           246:        if(type) {
        !           247:                printf("   Trap from %08X, type=%08X, R0=%08X, R1=%08X, R3=%08X, LR=%08X, AST=%08X\n", 
        !           248:                        sv->save_srr0, sv->save_exception, sv->save_r0, sv->save_r1, sv->save_r3,
        !           249:                        sv->save_lr, need_ast[0]);
        !           250:        }
        !           251:        else {
        !           252:                printf("Syscall from %08X, type=%08X, R0=%08X, R1=%08X, R3=%08X, LR=%08X, AST=%08X\n", 
        !           253:                        sv->save_srr0, sv->save_exception, sv->save_r0, sv->save_r1, sv->save_r3,
        !           254:                        sv->save_lr, need_ast[0]);
        !           255:        }
        !           256:        splx(spl);
        !           257:        return;
        !           258: }
        !           259: #endif

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