projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 43866e37 A |
1 | /* |
| 2 | * Copyright (c) 2003 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. | |
| 7 | * | |
| 8 | * This file contains Original Code and/or Modifications of Original Code | |
| 9 | * as defined in and that are subject to the Apple Public Source License | |
| 10 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 11 | * compliance with the License. Please obtain a copy of the License at | |
| 12 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 13 | * file. | |
| 14 | * | |
| 15 | * The Original Code and all software distributed under the License are | |
| 16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 20 | * Please see the License for the specific language governing rights and | |
| 21 | * limitations under the License. | |
| 22 | * | |
| 23 | * @APPLE_LICENSE_HEADER_END@ | |
| 24 | */ | |
| 25 | ||
| 26 | /* | |
| 27 | * This is a simplifed version of the commpage support from 10.3. | |
| 28 | * The supported feature is the tuning of _cpu_capabilities. | |
| 29 | * There is no shared page for user processes. | |
| 30 | */ | |
| 31 | ||
| 32 | #include <mach/mach_types.h> | |
| 33 | #include <mach/machine.h> | |
| 34 | #include <ppc/exception.h> | |
| 35 | #include <ppc/machine_routines.h> | |
| 36 | #include <machine/cpu_capabilities.h> | |
| 37 | #include <machine/commpage.h> | |
| 38 | ||
| 39 | int _cpu_capabilities = 0; // define the capability vector | |
| 40 | ||
| 41 | /* Determine number of CPUs on this system. We cannot rely on | |
| 42 | * machine_info.max_cpus this early in the boot. | |
| 43 | */ | |
| 44 | static int | |
| 45 | commpage_cpus( void ) | |
| 46 | { | |
| 47 | int cpus; | |
| 48 | ||
| 49 | cpus = ml_get_max_cpus(); // NB: this call can block | |
| 50 | ||
| 51 | if (cpus == 0) | |
| 52 | panic("commpage cpus==0"); | |
| 53 | if (cpus > 0xFF) | |
| 54 | cpus = 0xFF; | |
| 55 | ||
| 56 | return cpus; | |
| 57 | } | |
| 58 | ||
| 59 | ||
| 60 | /* Initialize kernel version of _cpu_capabilities vector (used by KEXTs.) */ | |
| 61 | ||
| 62 | static void | |
| 63 | commpage_init_cpu_capabilities( void ) | |
| 64 | { | |
| 65 | struct per_proc_info *pp; | |
| 66 | procFeatures *pfp; | |
| 67 | int cpus; | |
| 68 | int available; | |
| 69 | ||
| 70 | pp = per_proc_info; // use CPU 0's per-proc | |
| 71 | pfp = &pp->pf; // point to features in per-proc | |
| 72 | available = pfp->Available; | |
| 73 | ||
| 74 | // If AltiVec is disabled make sure it is not reported as available. | |
| 75 | if ((available & pfAltivec) == 0) { | |
| 76 | _cpu_capabilities &= ~kHasAltivec; | |
| 77 | } | |
| 78 | ||
| 79 | if (_cpu_capabilities & kDcbaAvailable) { // if this processor has DCBA, time it... | |
| 80 | _cpu_capabilities |= commpage_time_dcba(); // ...and set kDcbaRecomended if it helps. | |
| 81 | } | |
| 82 | ||
| 83 | cpus = commpage_cpus(); // how many CPUs do we have | |
| 84 | if (cpus == 1) _cpu_capabilities |= kUP; | |
| 85 | _cpu_capabilities |= (cpus << kNumCPUsShift); | |
| 86 | } | |
| 87 | ||
| 88 | ||
| 89 | /* Fill in commpage: called once, during kernel initialization, from the | |
| 90 | * startup thread before user-mode code is running. | |
| 91 | * See the top of this file for a list of what you have to do to add | |
| 92 | * a new routine to the commpage. | |
| 93 | */ | |
| 94 | void | |
| 95 | commpage_populate( void ) | |
| 96 | { | |
| 97 | commpage_init_cpu_capabilities(); | |
| 98 | } |