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Annotation of kernel/machdep/i386/pc_support/PCpublic.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) 1993 NeXT Computer, Inc.
        !            27:  *
        !            28:  * PC support public declarations.
        !            29:  *
        !            30:  * HISTORY
        !            31:  *
        !            32:  * 9 Mar 1993 ? at NeXT
        !            33:  *     Created.
        !            34:  */
        !            35:  
        !            36: #import <mach/mach_types.h>
        !            37: #if    !KERNEL
        !            38: #import <mach/vm_param.h>
        !            39: #endif
        !            40: 
        !            41: #import <architecture/i386/sel.h>
        !            42: #import <architecture/i386/cpu.h>
        !            43: #import <architecture/i386/fpu.h>
        !            44: 
        !            45: #import <bsd/i386/signal.h>
        !            46: 
        !            47: /*
        !            48:  * PCVERSIONNUMBER is incremented whenever
        !            49:  * a change is made that is not backwards
        !            50:  * compatible.  This should never be done
        !            51:  * after the first release, since it will
        !            52:  * break the existing libraries.
        !            53:  *
        !            54:  * PCRELEASENUMBER is incremented whenever
        !            55:  * a change is made that is backwards compatible
        !            56:  * but must be distingished from earlier releases.
        !            57:  *
        !            58:  * NEXTSTEP for Intel Processors Release 3.1 is
        !            59:  * defined to be PCVERSIONNUMBER 15, PCRELEASENUMBER 0.
        !            60:  */
        !            61: 
        !            62: #define PCVERSIONNUMBER                15
        !            63: #define PCRELEASENUMBER                1
        !            64: 
        !            65: typedef struct _PCcpuState {
        !            66:     unsigned int       eax;
        !            67:     unsigned int       ebx;
        !            68:     unsigned int       ecx;
        !            69:     unsigned int       edx;
        !            70:     unsigned int       edi;
        !            71:     unsigned int       esi;
        !            72:     unsigned int       ebp;
        !            73:     unsigned int       esp;
        !            74:     sel_t              ss;
        !            75:     unsigned short             :16;
        !            76:     unsigned int       eflags;
        !            77:     unsigned int       eip;
        !            78:     sel_t              cs;
        !            79:     unsigned short             :16;
        !            80:     sel_t              ds;
        !            81:     unsigned short             :16;
        !            82:     sel_t              es;
        !            83:     unsigned short             :16;
        !            84:     sel_t              fs;
        !            85:     unsigned short             :16;
        !            86:     sel_t              gs;
        !            87:     unsigned short             :16;
        !            88:     cr0_t              cr0;
        !            89: } _PCcpuState_t;
        !            90: 
        !            91: typedef struct fp_state _PCfpuState_t;
        !            92: 
        !            93: /*
        !            94:  * There are a total of PCMAXCONTEXT - 1
        !            95:  * contexts, since the initial context is
        !            96:  * not really a context.
        !            97:  *
        !            98:  * Each time a new context is created,
        !            99:  * the following fields are copied from
        !           100:  * the previous one:
        !           101:  *     runOptions
        !           102:  *     timeout
        !           103:  *     tick
        !           104:  */
        !           105: 
        !           106: #define PCMAXCONTEXT           8
        !           107: 
        !           108: typedef struct PCcontext {
        !           109:     // Saved context of call to PCrun()
        !           110:     struct sigcontext  runState;
        !           111:     
        !           112:     // True when running PC code (not in monitor)
        !           113:     boolean_t          running;
        !           114: 
        !           115:     // Last exception or interrupt info
        !           116:     unsigned int       trapNum;
        !           117:     unsigned int       errCode;
        !           118:     kern_return_t      exceptionResult;
        !           119:     unsigned int       callHandler;
        !           120: #define PC_HANDLE_NONE 0
        !           121: #define PC_HANDLE_FAULT        1
        !           122: #define PC_HANDLE_INTN 2
        !           123: #define PC_HANDLE_BOP  3
        !           124: #define PC_HANDLE_EXIT 4
        !           125: 
        !           126:     // Monitor callback conditions     
        !           127:     unsigned int       runOptions;
        !           128: #define PC_RUN_IF_SET          1
        !           129: #define PC_RUN_TIMEOUT         2
        !           130: #define PC_RUN_TICK            4
        !           131:     unsigned int       timeout;
        !           132:     unsigned int       tick;
        !           133:     
        !           134:     // Interrupt flag for instruction emulation
        !           135:     boolean_t          IF_flag;
        !           136: 
        !           137:     // TRUE means all FP instructions should trap 
        !           138:     boolean_t          EM_bit;
        !           139: 
        !           140:     // Extra flag bits for which we must simulate set/clear    
        !           141:     unsigned short     X_flags;
        !           142:     
        !           143:     // Mask of pending callbacks, updated synchronously
        !           144:     unsigned int       pendingCallbacks;
        !           145: #define PC_CALL_IF_SET PC_RUN_IF_SET
        !           146: #define PC_CALL_TIMEOUT        PC_RUN_TIMEOUT
        !           147: #define PC_CALL_TICK   PC_RUN_TICK
        !           148: #define PC_CALL_WOKEN  8
        !           149: 
        !           150:     // Mask of timer callbacks to be delivered
        !           151:     unsigned int       pendingTimers;
        !           152: 
        !           153:     // Mask of timers that are scheduled
        !           154:     unsigned int       expectedTimers;
        !           155: 
        !           156:     // Debugging features
        !           157:     unsigned int       debugOptions;
        !           158: #define PC_DEBUG_PRESERVE_TRACE                1
        !           159: } *PCcontext_t;
        !           160: 
        !           161: typedef unsigned char  PCfaultMask_t[32/BYTE_SIZE];
        !           162: typedef unsigned char  PCintNMask_t[256/BYTE_SIZE];
        !           163: typedef struct {
        !           164:     vm_offset_t                address;
        !           165:     vm_size_t          length;
        !           166: } PCdescTbl_t;
        !           167: 
        !           168: /*
        !           169:  * Top level structure of the memory
        !           170:  * region shared by the kernel and the
        !           171:  * library.  The 'versionNumber' field
        !           172:  * must come first.
        !           173:  */
        !           174: 
        !           175: typedef struct PCshared {
        !           176:     unsigned int       versionNumber;
        !           177:     PCfaultMask_t      faultMask;
        !           178:     PCintNMask_t       intNMask;
        !           179:     void               (*callbackHelper)(void);
        !           180:     PCfaultMask_t      machMask;
        !           181:     PCdescTbl_t                IDT;
        !           182:     PCdescTbl_t                LDT;
        !           183:     _PCcpuState_t      cpuState;
        !           184:     int                        currentContext;
        !           185:     struct PCcontext   contexts[PCMAXCONTEXT];
        !           186:     unsigned int       releaseNumber;
        !           187:     _PCfpuState_t      fpuState;
        !           188:     boolean_t
        !           189:                        fpuOwned        :1,
        !           190:                        fpuStateValid   :1;
        !           191: } *PCshared_t;
        !           192: 
        !           193: /*
        !           194:  * Arguments to mode switch
        !           195:  * BOPs (passed on stack).
        !           196:  */
        !           197: 
        !           198: typedef struct {
        !           199:     unsigned int       eip;
        !           200:     sel_t              cs;
        !           201:     unsigned short             :16;
        !           202:     unsigned int       eflags;
        !           203:     unsigned int       esp;
        !           204:     sel_t              ss;
        !           205:     unsigned short             :16;
        !           206: } PCbopFD_t, PCbopFA_t;
        !           207: 
        !           208: typedef struct {
        !           209:     unsigned short     ip;
        !           210:     sel_t              cs;
        !           211:     unsigned short     flags;
        !           212:     unsigned short     sp;
        !           213:     sel_t              ss;
        !           214: } PCbopFC_t;

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