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	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 Classic environment's PseudoKernel
	26
	27	Copyright: (c) 2000 Apple Computer, Inc. All rights reserved.
	28	*/
	29
	30	#include <libkern/OSTypes.h>
	31
	32	#include <ppc/exception.h>
	33
	34	/* Support firmware PseudoKernel FastTrap architectural extension */
	35
	36	#define bbMaxTrap (16 * sizeof(long))
	37	#define bbRFITrap bbMaxTrap
	38
	39	extern int bb_enable_bluebox(struct savearea *);
	40	extern int bb_disable_bluebox(struct savearea *);
	41	extern int bb_settaskenv(struct savearea *);
	42
	43	struct BlueExceptionDataArea {
	44	UInt32 srr0; // OUT PC at time of exception, IN return address
	45	UInt32 srr1; // OUT/IN msr FE0, BE, SE and FE1 bits to restore on exit
	46	UInt32 sprg0; // OUT R1 set to this value
	47	UInt32 sprg1; // OUT/IN R1 restored to this value
	48	};
	49	typedef struct BlueExceptionDataArea * BlueExceptionDataAreaPtr;
	50	typedef struct BlueExceptionDataArea BEDA_t;
	51
	52	/*
	53	The Blue Thread, which is running MacOS, needs to be able to handle Traps, SCs and interrupts.
	54	*/
	55	struct BlueThreadTrapDescriptor {
	56	UInt32 TrapVector; // 0=Trap
	57	UInt32 SysCallVector; // 1=SysCall
	58	UInt32 InterruptVector; // 2=Interrupt
	59	UInt32 PendingIntVector; // 3=Pending interrupt
	60	BEDA_t exceptionInfo; // Save registers at time of exception (trap/syscall)
	61	UInt32 InterruptControlWord; // Holds context state and backup CR2 bits
	62	UInt32 NewExitState; // New run state when exiting PseudoKernel
	63	UInt32 testIntMask; // Mask for a pending alternate context interrupt in backup CR2
	64	UInt32 postIntMask; // Mask to post an interrupt
	65	};
	66	typedef struct BlueThreadTrapDescriptor * BlueThreadTrapDescriptorPtr;
	67	typedef struct BlueThreadTrapDescriptor BTTD_t;
	68
	69	enum {
	70	// The following define the UInt32 gInterruptState
	71	kInUninitialized = 0, // State not yet initialized
	72	kInPseudoKernel = 1, // Currently executing within pseudo kernel
	73	kInSystemContext = 2, // Currently executing within the system (emulator) context
	74	kInAlternateContext = 3, // Currently executing within an alternate (native) context
	75	kInExceptionHandler = 4, // Currently executing an exception handler
	76	kOutsideBlue = 5, // Currently executing outside of the Blue thread
	77	kNotifyPending = 6, // Pending Notify Interrupt
	78
	79	kInterruptStateMask = 0x000F0000, // Mask to extract interrupt state from gInterruptState
	80	kInterruptStateShift = 16, // Shift count to align interrupt state
	81
	82	kBackupCR2Mask = 0x0000000F, // Mask to extract backup CR2 from gInterruptState
	83	kCR2ToBackupShift = 31-11, // Shift count to align CR2 into the backup CR2 of gInterruptState
	84	// (and vice versa)
	85	kCR2Mask = 0x00F00000 // Mask to extract CR2 from the PPC CR register
	86	};
	87
	88	struct bbRupt {
	89	struct ReturnHandler rh; /* Return handler address */
	90	};
	91	typedef struct bbRupt bbRupt;