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Annotation of kernel/kern/kernel_stack.h, revision 1.1.1.1

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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