Source to osfmk/ppc/atomic_switch.h


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/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @[email protected]
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @[email protected]
 */
typedef unsigned char	UInt8;
typedef unsigned short	UInt16;
typedef unsigned long	UInt32;


/* Support firmware CallPseudoKernel architectural extension */

struct CallPseudoKernelDescriptor {
	UInt32				pc;
	UInt32				gpr0;
	UInt32				intControlAddr;
	UInt32				newState;
	UInt32				intStateMask;
	UInt32				intCR2Mask;
	UInt32				intCR2Shift;
	UInt32				sysContextState;
};
typedef struct CallPseudoKernelDescriptor CallPseudoKernelDescriptor;
typedef CallPseudoKernelDescriptor * CallPseudoKernelDescriptorPtr;
typedef CallPseudoKernelDescriptor CPKD_t;



/* Support firmware ExitPseudoKernel architectural extension */

struct ExitPseudoKernelDescriptor {
	UInt32				pc;
	UInt32				sp;
	UInt32				gpr0;
	UInt32				gpr3;
	UInt32				cr;
	UInt32				intControlAddr;
	UInt32				newState;
	UInt32				intStateMask;
	UInt32				intCR2Mask;
	UInt32				intCR2Shift;
	UInt32				sysContextState;
	UInt32				intPendingMask;
	UInt32				intPendingPC;
	UInt32				msrUpdate;
};
typedef struct ExitPseudoKernelDescriptor ExitPseudoKernelDescriptor;
typedef ExitPseudoKernelDescriptor * ExitPseudoKernelDescriptorPtr;
typedef ExitPseudoKernelDescriptor EPKD_t;


struct EmulatorDescriptor {
	UInt8		regMap[16];		// table mapping 68K D0..D7, A0..A7 register to PowerPC registers
	UInt32		bootstrapVersionOffset;	// offset within emulator data page of the bootstrap version string
	UInt32		ecbOffset;		// offset within emulator data page of the ECB
	UInt32		intModeLevelOffset;	// offset within emulator data page of the interrupt mode level
	UInt32		entryAddress;		// offset within text of the emulator's main entry point
	UInt32		kcallTrapTableOffset;	// offset within text of the nanokernel(!) call trap table
	UInt32		postIntMask;		// post interrupt mask
	UInt32		clearIntMask;		// clear interrupt mask
	UInt32		testIntMask;		// test interrupt mask
	UInt32		codeSize;		// total size of emulator object code (interpretive + DR)
	UInt32		hashTableSize;		// size of DR emulator's hash table
	UInt32		drCodeStartOffset;	// offset within text of the DR emulator's object code
	UInt32		drInitOffset;		// offset within DR emulator of its initialization entry point
	UInt32		drAllocateCache;	// offset within DR emulator of its cache allocation entry point
	UInt32		dispatchTableOffset;	// offset within text of the encoded instruction dispatch table 
};
typedef struct EmulatorDescriptor EmulatorDescriptor;
typedef EmulatorDescriptor *EmulatorDescriptorPtr;

	
enum {
											// The following define the UInt32 gInterruptState
	kInUninitialized	=	0,			// State not yet initialized
	kInPseudoKernel		=	1,			// Currently executing within pseudo kernel
	kInSystemContext	=	2,			// Currently executing within the system (emulator) context
	kInAlternateContext	=	3,			// Currently executing within an alternate (native) context
	kInExceptionHandler	=	4,			// Currently executing an exception handler
	kOutsideMain		=	5,			// Currently executing outside of the main thread
	kNotifyPending		=	6,			// Pending Notify Interrupt

	kInterruptStateMask	=	0x000F0000,	// Mask to extract interrupt state from gInterruptState
	kInterruptStateShift	=	16,			// Shift count to align interrupt state

	kBackupCR2Mask		=	0x0000000F,	// Mask to extract backup CR2 from gInterruptState
	kCR2ToBackupShift	=	31-11,		// Shift count to align CR2 into the backup CR2 of gInterruptState
											//  (and vice versa)
	kCR2Mask		=	0x00F00000  // Mask to extract CR2 from the PPC CR register 
};


enum {
	kcReturnFromException		= 0,	
	kcRunAlternateContext		= 1,
	kcResetSystem				= 2,
	kcVMDispatch				= 3,
	kcPrioritizeInterrupts		= 4,
	kcPowerDispatch				= 5,
	kcRTASDispatch				= 6,
	kcGetAdapterProcPtrsPPC		= 12,
	kcGetAdapterProcPtrs		= 13,
	kcCallAdapterProc			= 14,
	kcSystemCrash				= 15
};

#define bbMaxCode 16