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Annotation of XNU/osfmk/ppc/PseudoKernel.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:        File:           PseudoKernelPriv.h
        !            24: 
        !            25:        Contains:       Interfaces for the TruBlue environment's PseudoKernel
        !            26: 
        !            27:        Copyright:      ) 1996-1997 by Apple Computer, Inc., all rights reserved.
        !            28: 
        !            29: */
        !            30: 
        !            31: #define bbMaxTrap 16
        !            32: #define bbExitTrap 14
        !            33: 
        !            34: /* Support firmware PseudoKernel FastTrap architectural extension */
        !            35: 
        !            36: #define bbPKTDShift    2                                       // 4 * ( 1 << shift ) = sizeof(PKTD_t)
        !            37: 
        !            38: struct PseudoKernelTrapDescriptor {
        !            39:        UInt32                          pc;                     // address of where we want to return to
        !            40:        UInt32                          reg;                    // place to save(GPR2) or restore(LR) registers
        !            41:        UInt32                          msr;                    // msr FE0, BE, SE and FE1 bits to restore on exit
        !            42:        UInt32                          newState;               // context state when we return
        !            43: };
        !            44: typedef struct PseudoKernelTrapDescriptor PseudoKernelTrapDescriptor;
        !            45: typedef PseudoKernelTrapDescriptor * PseudoKernelTrapDescriptorPtr;
        !            46: typedef PseudoKernelTrapDescriptor PKTD_t;
        !            47: 
        !            48: struct BlueBoxData {
        !            49:        PKTD_t                          PKTD[bbMaxTrap];
        !            50:        UInt32                          InterruptControlWord;   // holds context state and backup CR2 bits
        !            51:        UInt32                          InterruptPendingPC;             // PC of where to handle interruptions */
        !            52:        UInt32                          ihs_pc;                 // Interrupt Hold State
        !            53:        UInt32                          ihs_gpr2;               // Interrupt Hold State
        !            54:        UInt32                          testIntMask;            // Mask to check for a pending interrupt
        !            55:        UInt32                          postIntMask;            // Mask to post an interrupt
        !            56: };
        !            57: typedef struct BlueBoxData BlueBoxData;
        !            58: typedef BlueBoxData BDA_t;
        !            59:        
        !            60: enum {
        !            61:                                                        // The following define the UInt32 gInterruptState
        !            62:        kInUninitialized        =       0,              // State not yet initialized
        !            63:        kInPseudoKernel         =       1,              // Currently executing within pseudo kernel
        !            64:        kInSystemContext        =       2,              // Currently executing within the system (emulator) context
        !            65:        kInAlternateContext     =       3,              // Currently executing within an alternate (native) context
        !            66:        kInExceptionHandler     =       4,              // Currently executing an exception handler
        !            67:        kOutsideBlue            =       5,              // Currently executing outside of the Blue thread
        !            68:        kNotifyPending          =       6,              // Pending Notify Interrupt
        !            69: 
        !            70:        kInterruptStateMask     =       0x000F0000,     // Mask to extract interrupt state from gInterruptState
        !            71:        kInterruptStateShift    =       16,             // Shift count to align interrupt state
        !            72: 
        !            73:        kBackupCR2Mask          =       0x0000000F,     // Mask to extract backup CR2 from gInterruptState
        !            74:        kCR2ToBackupShift       =       31-11,          // Shift count to align CR2 into the backup CR2 of gInterruptState
        !            75:                                                        //  (and vice versa)
        !            76:        kCR2Mask                =       0x00F00000      // Mask to extract CR2 from the PPC CR register 
        !            77: };
        !            78: 
        !            79: struct bbRupt {
        !            80:        struct ReturnHandler    rh;                     /* Return handler address */
        !            81:        unsigned long                   ruptRtn;        /* Interrupt PC */
        !            82: };
        !            83: typedef struct bbRupt bbRupt;

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