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Annotation of kernel/kern/kernel_stack.h, 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: /* 
        !            26:  * Copyright (c) 1990 NeXT, Inc.
        !            27:  *
        !            28:  *  History:
        !            29:  *
        !            30:  *     18-Jul-90: Brian Pinkerton at NeXT
        !            31:  *             created
        !            32:  */
        !            33: #import <mach/machine/vm_types.h>
        !            34: #import        <mach/machine/vm_param.h>
        !            35: #import <kern/queue.h>
        !            36: 
        !            37: /*
        !            38:  *  Public procedures
        !            39:  */
        !            40: void initKernelStacks();               /* initialize the module */
        !            41: vm_offset_t allocStack();              /* allocate a new kernel stack */
        !            42: void freeStack(vm_offset_t stack);     /* free a kernel stack */
        !            43: void swapOutStack(vm_offset_t stack);   /* try to swap out a stack */
        !            44: void swapInStack(vm_offset_t stack);   /* swap in a stack */
        !            45: 
        !            46: 
        !            47: /*
        !            48:  *  The struct _kernelStack sits at the beginning of a kernel stack (under the
        !            49:  *  pcb & u area).  We declare it here because the size of the kernel stack depends
        !            50:  *  on it.
        !            51:  */
        !            52: enum stackStatus { STACK_FREE, STACK_SWAPPED, STACK_IN_USE };
        !            53: 
        !            54: typedef struct _kernelStack {
        !            55:        queue_chain_t           freeList;
        !            56:        enum stackStatus        status;
        !            57: } *kernelStack;
        !            58: 
        !            59: /*
        !            60:  * The size of the kernel stack returned from allocStack().
        !            61:  * KERNSTACK_SIZE is defined in <mach/machine/vm_param.h>
        !            62:  */
        !            63: #define        KERNEL_STACK_SIZE       (KERNSTACK_SIZE - sizeof(struct _kernelStack))

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