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Annotation of XNU/osfmk/i386/thread.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:  * Mach Operating System
        !            27:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
        !            28:  * All Rights Reserved.
        !            29:  * 
        !            30:  * Permission to use, copy, modify and distribute this software and its
        !            31:  * documentation is hereby granted, provided that both the copyright
        !            32:  * notice and this permission notice appear in all copies of the
        !            33:  * software, derivative works or modified versions, and any portions
        !            34:  * thereof, and that both notices appear in supporting documentation.
        !            35:  * 
        !            36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            39:  * 
        !            40:  * Carnegie Mellon requests users of this software to return to
        !            41:  * 
        !            42:  *  Software Distribution Coordinator  or  [email protected]
        !            43:  *  School of Computer Science
        !            44:  *  Carnegie Mellon University
        !            45:  *  Pittsburgh PA 15213-3890
        !            46:  * 
        !            47:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            48:  * the rights to redistribute these changes.
        !            49:  */
        !            50: /*
        !            51:  */
        !            52: 
        !            53: /*
        !            54:  *     File:   machine/thread.h
        !            55:  *
        !            56:  *     This file contains the structure definitions for the thread
        !            57:  *     state as applied to I386 processors.
        !            58:  */
        !            59: 
        !            60: #ifndef        _I386_THREAD_H_
        !            61: #define _I386_THREAD_H_
        !            62: 
        !            63: #include <mach/boolean.h>
        !            64: #include <mach/i386/vm_types.h>
        !            65: #include <mach/i386/fp_reg.h>
        !            66: 
        !            67: #include <kern/lock.h>
        !            68: 
        !            69: #include <i386/iopb.h>
        !            70: #include <i386/seg.h>
        !            71: #include <i386/tss.h>
        !            72: #include <i386/eflags.h>
        !            73: #include <i386/thread_act.h>
        !            74: 
        !            75: /*
        !            76:  *     i386_exception_link:
        !            77:  *
        !            78:  *     This structure lives at the high end of the kernel stack.
        !            79:  *     It points to the current thread`s user registers.
        !            80:  */
        !            81: struct i386_exception_link {
        !            82:        struct i386_saved_state *saved_state;
        !            83: };
        !            84: 
        !            85: 
        !            86: /*
        !            87:  *     On the kernel stack is:
        !            88:  *     stack:  ...
        !            89:  *             struct i386_exception_link
        !            90:  *             struct i386_kernel_state
        !            91:  *     stack+KERNEL_STACK_SIZE
        !            92:  */
        !            93: 
        !            94: #define STACK_IKS(stack)       \
        !            95:        ((struct i386_kernel_state *)((stack) + KERNEL_STACK_SIZE) - 1)
        !            96: #define STACK_IEL(stack)       \
        !            97:        ((struct i386_exception_link *)STACK_IKS(stack) - 1)
        !            98: 
        !            99: #if    NCPUS > 1
        !           100: #include <i386/mp_desc.h>
        !           101: #endif
        !           102: 
        !           103: /*
        !           104:  * Boot-time data for master (or only) CPU
        !           105:  */
        !           106: extern struct fake_descriptor  idt[IDTSZ];
        !           107: extern struct fake_descriptor  gdt[GDTSZ];
        !           108: extern struct fake_descriptor  ldt[LDTSZ];
        !           109: extern struct i386_tss         ktss;
        !           110: #if    MACH_KDB
        !           111: extern char                    db_stack_store[];
        !           112: extern char                    db_task_stack_store[];
        !           113: extern struct i386_tss         dbtss;
        !           114: extern void                    db_task_start(void);
        !           115: #endif /* MACH_KDB */
        !           116: #if    NCPUS > 1
        !           117: #define        curr_gdt(mycpu)         (mp_gdt[mycpu])
        !           118: #define        curr_ktss(mycpu)        (mp_ktss[mycpu])
        !           119: #else
        !           120: #define        curr_gdt(mycpu)         (gdt)
        !           121: #define        curr_ktss(mycpu)        (&ktss)
        !           122: #endif
        !           123: 
        !           124: #define        gdt_desc_p(mycpu,sel) \
        !           125:        ((struct real_descriptor *)&curr_gdt(mycpu)[sel_idx(sel)])
        !           126: 
        !           127: /*
        !           128:  * Return address of the function that called current function, given
        !           129:  *     address of the first parameter of current function.
        !           130:  */
        !           131: #define        GET_RETURN_PC(addr)     (*((vm_offset_t *)addr - 1))
        !           132: 
        !           133: /*
        !           134:  * Defining this indicates that MD code will supply an exception()
        !           135:  * routine, conformant with kern/exception.c (dependency alert!)
        !           136:  * but which does wonderfully fast, machine-dependent magic.
        !           137:  */
        !           138: #define MACHINE_FAST_EXCEPTION 1
        !           139: 
        !           140: /*
        !           141:  * MD Macro to fill up global stack state,
        !           142:  * keeping the MD structure sizes + games private
        !           143:  */
        !           144: #define MACHINE_STACK_STASH(stack)                                      \
        !           145: MACRO_BEGIN                                                            \
        !           146:        mp_disable_preemption();                                        \
        !           147:        kernel_stack[cpu_number()] = (stack) +                          \
        !           148:            (KERNEL_STACK_SIZE - sizeof (struct i386_exception_link)    \
        !           149:                                - sizeof (struct i386_kernel_state)),   \
        !           150:                active_stacks[cpu_number()] = (stack);                  \
        !           151:        mp_enable_preemption();                                         \
        !           152: MACRO_END
        !           153: 
        !           154: #endif /* _I386_THREAD_H_ */

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