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Annotation of XNU/osfmk/ppc/PseudoKernel.h, revision 1.1.1.1

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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