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Annotation of XNU/osfmk/i386/cpu_data.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        I386_CPU_DATA
        !            28: #define I386_CPU_DATA
        !            29: 
        !            30: #include <cpus.h>
        !            31: #include <mach_assert.h>
        !            32: 
        !            33: #if    defined(__GNUC__)
        !            34: 
        !            35: #include <kern/assert.h>
        !            36: #include <kern/kern_types.h>
        !            37: 
        !            38: #if 0
        !            39: #ifndef        __OPTIMIZE__
        !            40: #define extern static
        !            41: #endif
        !            42: #endif
        !            43: 
        !            44: /*
        !            45:  * Everyone within the osfmk part of the kernel can use the fast
        !            46:  * inline versions of these routines.  Everyone outside, must call
        !            47:  * the real thing,
        !            48:  */
        !            49: extern thread_t        __inline__ current_thread_fast(void);
        !            50: extern thread_t __inline__ current_thread_fast(void)
        !            51: {
        !            52:        register thread_t       ct;
        !            53:        register int            idx = (int)&((cpu_data_t *)0)->active_thread;
        !            54: 
        !            55:        __asm__ volatile ("     movl %%gs:(%1),%0" : "=r" (ct) : "r" (idx));
        !            56: 
        !            57:        return (ct);
        !            58: }
        !            59: 
        !            60: #define current_thread()       current_thread_fast()
        !            61: 
        !            62: extern int     __inline__      get_preemption_level(void);
        !            63: extern void    __inline__      disable_preemption(void);
        !            64: extern void    __inline__      enable_preemption(void);
        !            65: extern void    __inline__      enable_preemption_no_check(void);
        !            66: extern void    __inline__      mp_disable_preemption(void);
        !            67: extern void    __inline__      mp_enable_preemption(void);
        !            68: extern void    __inline__      mp_enable_preemption_no_check(void);
        !            69: extern int     __inline__      get_simple_lock_count(void);
        !            70: extern int     __inline__      get_interrupt_level(void);
        !            71: 
        !            72: extern int __inline__          get_preemption_level(void)
        !            73: {
        !            74:        register int    idx = (int)&((cpu_data_t *)0)->preemption_level;
        !            75:        register int    pl;
        !            76: 
        !            77:        __asm__ volatile ("     movl %%gs:(%1),%0" : "=r" (pl) : "r" (idx));
        !            78: 
        !            79:        return (pl);
        !            80: }
        !            81: 
        !            82: extern void __inline__         disable_preemption(void)
        !            83: {
        !            84: #if    MACH_ASSERT
        !            85:        extern void _disable_preemption(void);
        !            86: 
        !            87:        _disable_preemption();
        !            88: #else  /* MACH_ASSERT */
        !            89:        register int    idx = (int)&((cpu_data_t *)0)->preemption_level;
        !            90: 
        !            91:        __asm__ volatile ("     incl %%gs:(%0)" : : "r" (idx));
        !            92: #endif /* MACH_ASSERT */
        !            93: }
        !            94: 
        !            95: extern void __inline__         enable_preemption(void)
        !            96: {
        !            97: #if    MACH_ASSERT
        !            98:        extern void _enable_preemption(void);
        !            99: 
        !           100:        assert(get_preemption_level() > 0);
        !           101:        _enable_preemption();
        !           102: #else  /* MACH_ASSERT */
        !           103:        extern void             kernel_preempt_check (void);
        !           104:        register int    idx = (int)&((cpu_data_t *)0)->preemption_level;
        !           105:        register void (*kpc)(void)=     kernel_preempt_check;
        !           106: 
        !           107:        __asm__ volatile ("decl %%gs:(%0); jne 1f; \
        !           108:                        call %1; 1:"
        !           109:                        : /* no outputs */
        !           110:                        : "r" (idx), "r" (kpc)
        !           111:                        : "%eax", "%ecx", "%edx", "cc", "memory");
        !           112: #endif /* MACH_ASSERT */
        !           113: }
        !           114: 
        !           115: extern void __inline__         enable_preemption_no_check(void)
        !           116: {
        !           117: #if    MACH_ASSERT
        !           118:        extern void _enable_preemption_no_check(void);
        !           119: 
        !           120:        assert(get_preemption_level() > 0);
        !           121:        _enable_preemption_no_check();
        !           122: #else  /* MACH_ASSERT */
        !           123:        register int    idx = (int)&((cpu_data_t *)0)->preemption_level;
        !           124: 
        !           125:        __asm__ volatile ("decl %%gs:(%0)"
        !           126:                        : /* no outputs */
        !           127:                        : "r" (idx)
        !           128:                        : "cc", "memory");
        !           129: #endif /* MACH_ASSERT */
        !           130: }
        !           131: 
        !           132: extern void __inline__         mp_disable_preemption(void)
        !           133: {
        !           134: #if    NCPUS > 1
        !           135:        disable_preemption();
        !           136: #endif /* NCPUS > 1 */
        !           137: }
        !           138: 
        !           139: extern void __inline__         mp_enable_preemption(void)
        !           140: {
        !           141: #if    NCPUS > 1
        !           142:        enable_preemption();
        !           143: #endif /* NCPUS > 1 */
        !           144: }
        !           145: 
        !           146: extern void __inline__         mp_enable_preemption_no_check(void)
        !           147: {
        !           148: #if    NCPUS > 1
        !           149:        enable_preemption_no_check();
        !           150: #endif /* NCPUS > 1 */
        !           151: }
        !           152: 
        !           153: extern int __inline__          get_simple_lock_count(void)
        !           154: {
        !           155:        register int    idx = (int)&((cpu_data_t *)0)->simple_lock_count;
        !           156:        register int    pl;
        !           157: 
        !           158:        __asm__ volatile ("     movl %%gs:(%1),%0" : "=r" (pl) : "r" (idx));
        !           159: 
        !           160:        return (pl);
        !           161: }
        !           162: 
        !           163: extern int __inline__          get_interrupt_level(void)
        !           164: {
        !           165:        register int    idx = (int)&((cpu_data_t *)0)->interrupt_level;
        !           166:        register int    pl;
        !           167: 
        !           168:        __asm__ volatile ("     movl %%gs:(%1),%0" : "=r" (pl) : "r" (idx));
        !           169: 
        !           170:        return (pl);
        !           171: }
        !           172: 
        !           173: #if 0
        !           174: #ifndef        __OPTIMIZE__
        !           175: #undef         extern 
        !           176: #endif
        !           177: #endif
        !           178: 
        !           179: #else  /* !defined(__GNUC__) */
        !           180: 
        !           181: #endif /* defined(__GNUC__) */
        !           182: 
        !           183: #endif /* I386_CPU_DATA */

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