[apple/xnu.git] / osfmk / ppc / savearea.h

/*
 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * 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.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
#ifndef _PPC_SAVEAREA_H_
#define _PPC_SAVEAREA_H_

#ifndef ASSEMBLER

#include <sys/appleapiopts.h>

#ifdef __APPLE_API_PRIVATE

#ifdef	MACH_KERNEL_PRIVATE
#include <mach/ppc/vm_types.h>
typedef struct savearea_comm {

/*
 *	The following fields are common to all saveareas and are used to manage individual
 *	contexts.
 *	
 *	Fields that start with "save" are part of the individual saveareas.  Those that
 *	start with "sac" pertain to the free pool stuff and are valid only on the first slot
 *	in the page.
 */


/*	Keep the save_prev, sac_next, and sac_prev in these positions, some assemble code depends upon it to
 *	match up with fields in saveanchor.
 */
	struct savearea	*save_prev;					/* The address of the previous (or next) savearea */
	unsigned int	*sac_next;					/* Points to next savearea page that has a free slot  - real */
	unsigned int	*sac_prev;					/* Points to previous savearea page that has a free slot  - real */
	unsigned int	save_flags;					/* Various flags */
	unsigned int	save_level;					/* Context ID */
	unsigned int	save_time[2];				/* Context save time - for debugging or performance */
	struct thread_activation	*save_act;		/* Associated activation  */

/*                                                 0x20 */

	unsigned int	sac_vrswap;					/* XOR mask to swap V to R or vice versa */
	unsigned int	sac_alloc;					/* Bitmap of allocated slots */
	unsigned int	sac_flags;					/* Various flags */
	unsigned int	save_misc0;					/* Various stuff */
	unsigned int	save_misc1;					/* Various stuff */
	unsigned int	save_misc2;					/* Various stuff */
	unsigned int	save_misc3;					/* Various stuff */
	unsigned int	save_misc4;					/* Various stuff */

	unsigned int	save_040[8];				/* Fill 32 bytes */

												/* offset 0x0060 */
} savearea_comm;
#endif

#ifdef BSD_KERNEL_PRIVATE
typedef struct savearea_comm {
	unsigned int	save_000[24];
} savearea_comm;
#endif

#if	defined(MACH_KERNEL_PRIVATE) || defined(BSD_KERNEL_PRIVATE)
/*
 *	This type of savearea contains all of the general context.
 */
 
typedef struct savearea {

	savearea_comm	save_hdr;					/* Stuff common to all saveareas */

	unsigned int	save_060[8];				/* Fill 32 bytes */
												/* offset 0x0080 */
	unsigned int 	save_r0;
	unsigned int 	save_r1;
	unsigned int 	save_r2;
	unsigned int 	save_r3;
	unsigned int 	save_r4;
	unsigned int 	save_r5;
	unsigned int 	save_r6;
	unsigned int 	save_r7;
	
												/* offset 0x0A0 */
	unsigned int 	save_r8;
	unsigned int 	save_r9;
	unsigned int 	save_r10;
	unsigned int 	save_r11;
	unsigned int 	save_r12;
	unsigned int 	save_r13;
	unsigned int 	save_r14;
	unsigned int 	save_r15;
	
												/* offset 0x0C0 */
	unsigned int 	save_r16;
	unsigned int 	save_r17;
	unsigned int 	save_r18;
	unsigned int 	save_r19;
	unsigned int 	save_r20;
	unsigned int 	save_r21;
	unsigned int 	save_r22;
	unsigned int 	save_r23;
	
												/* offset 0x0E0 */
	unsigned int 	save_r24;
	unsigned int 	save_r25;
	unsigned int 	save_r26;	
	unsigned int 	save_r27;
	unsigned int 	save_r28;
	unsigned int 	save_r29;
	unsigned int 	save_r30;
	unsigned int 	save_r31;
	
												/* offset 0x100 */
	unsigned int 	save_srr0;
	unsigned int 	save_srr1;
	unsigned int	save_cr;
	unsigned int 	save_xer;
	unsigned int 	save_lr;
	unsigned int 	save_ctr;
	unsigned int 	save_dar;
	unsigned int 	save_dsisr;
			

												/* offset 0x120 */
	unsigned int	save_vscr[4];	
	unsigned int	save_fpscrpad;
	unsigned int	save_fpscr;
	unsigned int	save_exception;
	unsigned int	save_vrsave;

												/* offset 0x140 */
	unsigned int 	save_sr0;
	unsigned int 	save_sr1;
	unsigned int 	save_sr2;
	unsigned int 	save_sr3;
	unsigned int 	save_sr4;
	unsigned int 	save_sr5;
	unsigned int 	save_sr6;
	unsigned int 	save_sr7;

												/* offset 0x160 */
	unsigned int 	save_sr8;
	unsigned int 	save_sr9;
	unsigned int 	save_sr10;
	unsigned int 	save_sr11;
	unsigned int 	save_sr12;
	unsigned int 	save_sr13;
	unsigned int 	save_sr14;
	unsigned int 	save_sr15;

												/* offset 0x180 */
	unsigned int	save_180[8];
	unsigned int	save_1A0[8];
	unsigned int	save_1C0[8];
	unsigned int	save_1E0[8];
	unsigned int	save_200[8];
	unsigned int	save_220[8];
	unsigned int	save_240[8];
	unsigned int	save_260[8];

												/* offset 0x280 */
} savearea;


/*
 *	This type of savearea contains all of the floating point context.
 */
 
typedef struct savearea_fpu {

	savearea_comm	save_hdr;					/* Stuff common to all saveareas */

	unsigned int	save_060[8];				/* Fill 32 bytes */
												/* offset 0x0080 */
	double			save_fp0;
	double			save_fp1;
	double			save_fp2;
	double			save_fp3;

	double			save_fp4;
	double			save_fp5;
	double			save_fp6;
	double			save_fp7;

	double			save_fp8;
	double			save_fp9;
	double			save_fp10;
	double			save_fp11;
	
	double			save_fp12;
	double			save_fp13;
	double			save_fp14;
	double			save_fp15;
	
	double			save_fp16;
	double			save_fp17;
	double			save_fp18;
	double			save_fp19;

	double			save_fp20;
	double			save_fp21;
	double			save_fp22;
	double			save_fp23;
	
	double			save_fp24;
	double			save_fp25;
	double			save_fp26;
	double			save_fp27;
	
	double			save_fp28;
	double			save_fp29;
	double			save_fp30;
	double			save_fp31;
												/* offset 0x180 */
	unsigned int	save_180[8];
	unsigned int	save_1A0[8];
	unsigned int	save_1C0[8];
	unsigned int	save_1E0[8];
	unsigned int	save_200[8];
	unsigned int	save_220[8];
	unsigned int	save_240[8];
	unsigned int	save_260[8];

												/* offset 0x280 */
} savearea_fpu;

	
/*
 *	This type of savearea contains all of the vector context.
 */
 
typedef struct savearea_vec {

	savearea_comm	save_hdr;					/* Stuff common to all saveareas */

	unsigned int	save_060[7];				/* Fill 32 bytes */
	unsigned int	save_vrvalid;				/* Valid registers in saved context */

												/* offset 0x0080 */
	unsigned int	save_vr0[4];
	unsigned int	save_vr1[4];
	unsigned int	save_vr2[4];
	unsigned int	save_vr3[4];
	unsigned int	save_vr4[4];
	unsigned int	save_vr5[4];
	unsigned int	save_vr6[4];
	unsigned int	save_vr7[4];
	unsigned int	save_vr8[4];
	unsigned int	save_vr9[4];
	unsigned int	save_vr10[4];
	unsigned int	save_vr11[4];
	unsigned int	save_vr12[4];
	unsigned int	save_vr13[4];
	unsigned int	save_vr14[4];
	unsigned int	save_vr15[4];
	unsigned int	save_vr16[4];
	unsigned int	save_vr17[4];
	unsigned int	save_vr18[4];
	unsigned int	save_vr19[4];
	unsigned int	save_vr20[4];
	unsigned int	save_vr21[4];
	unsigned int	save_vr22[4];
	unsigned int	save_vr23[4];
	unsigned int	save_vr24[4];
	unsigned int	save_vr25[4];
	unsigned int	save_vr26[4];
	unsigned int	save_vr27[4];
	unsigned int	save_vr28[4];
	unsigned int	save_vr29[4];
	unsigned int	save_vr30[4];
	unsigned int	save_vr31[4];

												/* offset 0x280 */
} savearea_vec;
#endif /* MACH_KERNEL_PRIVATE || BSD_KERNEL_PRIVATE */

#ifdef	MACH_KERNEL_PRIVATE

struct Saveanchor {

/*	
 *	Note that this force aligned in aligned_data.s and must be in V=R storage.
 *	Also, all addresses in chains are physical.  This structure can only be 
 *	updated with translation and interrupts disabled. This is because it is 
 *	locked during exception processing and if we were to take a PTE miss while the
 *	lock were held, well, that would be very bad now wouldn't it? 
 */

	unsigned int	savelock;				/* Lock word for savearea free list manipulation */
	unsigned int	*savepoolfwd;			/* Forward anchor for the free pool */
	unsigned int	*savepoolbwd;			/* Backward anchor for the free pool */
	volatile unsigned int	savefree;		/* Anchor for the global free list */
	volatile unsigned int	savefreecnt;	/* Number of saveareas on global free list */
	volatile int	saveadjust;				/* If 0 number of saveareas is ok, otherwise number to change (positive means grow, negative means shrink */
	volatile int	saveinuse;				/* Number of areas in use counting those on the local free list */
	volatile int	savetarget;				/* Number of savearea's needed */
	int				savemaxcount;			/* Maximum saveareas ever allocated */


};


#define sac_cnt		(4096 / sizeof(savearea))	/* Number of saveareas per page */
#define sac_empty	(0xFFFFFFFF << (32 - sac_cnt))	/* Mask with all entries empty */
#define sac_perm	0x40000000				/* Page permanently assigned */
#define sac_permb	1						/* Page permanently assigned - bit position */

#define LocalSaveTarget	(((8 + sac_cnt - 1) / sac_cnt) * sac_cnt)	/* Target for size of local savearea free list */
#define LocalSaveMin	(LocalSaveTarget / 2)	/* Min size of local savearea free list before we grow */
#define LocalSaveMax	(LocalSaveTarget * 2)	/* Max size of local savearea free list before we trim */

#define FreeListMin		(2 * LocalSaveTarget * NCPUS)	/* Always make sure there are enough to fill local list twice per processor */
#define SaveLowHysteresis	LocalSaveTarget	/* The number off from target before we adjust upwards */
#define SaveHighHysteresis	FreeListMin		/* The number off from target before we adjust downwards */
#define InitialSaveAreas 	(2 * FreeListMin)	/* The number of saveareas to make at boot time */
#define InitialSaveTarget	FreeListMin		/* The number of saveareas for an initial target. This should be the minimum ever needed. */
#define	InitialSaveBloks	(InitialSaveAreas + sac_cnt - 1) / sac_cnt	/* The number of savearea blocks to allocate at boot */


void 			save_release(struct savearea *);	/* Release a save area  */
struct savectl	*save_dequeue(void);			/* Find and dequeue one that is all empty */
unsigned int	save_queue(struct savearea *);	/* Add a new savearea block to the free list */
struct savearea	*save_get(void);				/* Obtains a savearea from the free list (returns virtual address) */
struct savearea	*save_get_phys(void);			/* Obtains a savearea from the free list (returns physical address) */
struct savearea	*save_alloc(void);				/* Obtains a savearea and allocates blocks if needed */
struct savearea	*save_cpv(struct savearea *);	/* Converts a physical savearea address to virtual */
void			save_ret(struct savearea *);	/* Returns a savearea to the free list */
void			save_ret_phys(struct savearea *);	/* Returns a savearea to the free list */
void			save_adjust(void);				/* Adjust size of the global free list */
struct savearea_comm	*save_trim_freet(void);			/* Remove free pages from savearea pool */

#endif /* MACH_KERNEL_PRIVATE */
#endif /* __APPLE_API_PRIVATE */

#endif /* ndef ASSEMBLER */

#define SAVattach	0x80000000				/* Savearea has valid context */
#define SAVrststk	0x00010000				/* Indicates that the current stack should be reset to empty */
#define SAVsyscall	0x00020000				/* Indicates that the savearea is associated with a syscall */
#define SAVredrive	0x00040000				/* Indicates that the low-level fault handler associated */
#define SAVtype		0x0000FF00				/* Shows type of savearea */
#define SAVtypeshft	8						/* Shift to position type */
#define SAVempty	0x86					/* Savearea is on free list */
#define SAVgeneral	0x01					/* Savearea contains general context */
#define SAVfloat	0x02					/* Savearea contains floating point context */
#define SAVvector	0x03					/* Savearea contains vector context */

#endif /* _PPC_SAVEAREA_H_ */
Commit	Line	Data
1c79356b	1	/*
9bccf70c	2	* Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
1c79356b A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
de355530 A	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.
1c79356b	11	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
de355530 A	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.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	#ifndef _PPC_SAVEAREA_H_
	23	#define _PPC_SAVEAREA_H_
	24
9bccf70c A	25	#ifndef ASSEMBLER
	26
	27	#include <sys/appleapiopts.h>
	28
	29	#ifdef __APPLE_API_PRIVATE
	30
	31	#ifdef MACH_KERNEL_PRIVATE
de355530	32	#include <mach/ppc/vm_types.h>
9bccf70c A	33	typedef struct savearea_comm {
	34
	35	/*
	36	* The following fields are common to all saveareas and are used to manage individual
	37	* contexts.
	38	*
	39	* Fields that start with "save" are part of the individual saveareas. Those that
	40	* start with "sac" pertain to the free pool stuff and are valid only on the first slot
	41	* in the page.
	42	*/
	43
	44
de355530	45	/* Keep the save_prev, sac_next, and sac_prev in these positions, some assemble code depends upon it to
9bccf70c A	46	* match up with fields in saveanchor.
9bccf70c A	47	*/
de355530 A	48	struct savearea save_prev; / The address of the previous (or next) savearea */
	49	unsigned int sac_next; / Points to next savearea page that has a free slot - real */
	50	unsigned int sac_prev; / Points to previous savearea page that has a free slot - real */
	51	unsigned int save_flags; /* Various flags */
9bccf70c A	52	unsigned int save_level; /* Context ID */
	53	unsigned int save_time[2]; /* Context save time - for debugging or performance */
	54	struct thread_activation save_act; / Associated activation */
de355530 A	55
	56	/* 0x20 */
	57
	58	unsigned int sac_vrswap; /* XOR mask to swap V to R or vice versa */
d7e50217	59	unsigned int sac_alloc; /* Bitmap of allocated slots */
de355530 A	60	unsigned int sac_flags; /* Various flags */
	61	unsigned int save_misc0; /* Various stuff */
	62	unsigned int save_misc1; /* Various stuff */
	63	unsigned int save_misc2; /* Various stuff */
	64	unsigned int save_misc3; /* Various stuff */
	65	unsigned int save_misc4; /* Various stuff */
	66
	67	unsigned int save_040[8]; /* Fill 32 bytes */
9bccf70c A	68
	69	/* offset 0x0060 */
	70	} savearea_comm;
	71	#endif
	72
	73	#ifdef BSD_KERNEL_PRIVATE
	74	typedef struct savearea_comm {
	75	unsigned int save_000[24];
	76	} savearea_comm;
	77	#endif
	78
	79	#if defined(MACH_KERNEL_PRIVATE) \|\| defined(BSD_KERNEL_PRIVATE)
	80	/*
	81	* This type of savearea contains all of the general context.
	82	*/
	83
	84	typedef struct savearea {
	85
	86	savearea_comm save_hdr; /* Stuff common to all saveareas */
	87
	88	unsigned int save_060[8]; /* Fill 32 bytes */
de355530 A	89	/* offset 0x0080 */
	90	unsigned int save_r0;
	91	unsigned int save_r1;
	92	unsigned int save_r2;
	93	unsigned int save_r3;
	94	unsigned int save_r4;
	95	unsigned int save_r5;
	96	unsigned int save_r6;
	97	unsigned int save_r7;
	98
	99	/* offset 0x0A0 */
	100	unsigned int save_r8;
	101	unsigned int save_r9;
	102	unsigned int save_r10;
	103	unsigned int save_r11;
	104	unsigned int save_r12;
	105	unsigned int save_r13;
	106	unsigned int save_r14;
	107	unsigned int save_r15;
	108
	109	/* offset 0x0C0 */
	110	unsigned int save_r16;
	111	unsigned int save_r17;
	112	unsigned int save_r18;
	113	unsigned int save_r19;
	114	unsigned int save_r20;
	115	unsigned int save_r21;
	116	unsigned int save_r22;
	117	unsigned int save_r23;
	118
	119	/* offset 0x0E0 */
	120	unsigned int save_r24;
	121	unsigned int save_r25;
	122	unsigned int save_r26;
	123	unsigned int save_r27;
	124	unsigned int save_r28;
	125	unsigned int save_r29;
	126	unsigned int save_r30;
	127	unsigned int save_r31;
	128
	129	/* offset 0x100 */
	130	unsigned int save_srr0;
	131	unsigned int save_srr1;
9bccf70c	132	unsigned int save_cr;
de355530 A	133	unsigned int save_xer;
	134	unsigned int save_lr;
	135	unsigned int save_ctr;
	136	unsigned int save_dar;
9bccf70c	137	unsigned int save_dsisr;
de355530 A	138
	139
	140	/* offset 0x120 */
	141	unsigned int save_vscr[4];
9bccf70c A	142	unsigned int save_fpscrpad;
9bccf70c A	143	unsigned int save_fpscr;
de355530 A	144	unsigned int save_exception;
	145	unsigned int save_vrsave;
	146
	147	/* offset 0x140 */
	148	unsigned int save_sr0;
	149	unsigned int save_sr1;
	150	unsigned int save_sr2;
	151	unsigned int save_sr3;
	152	unsigned int save_sr4;
	153	unsigned int save_sr5;
	154	unsigned int save_sr6;
	155	unsigned int save_sr7;
	156
	157	/* offset 0x160 */
	158	unsigned int save_sr8;
	159	unsigned int save_sr9;
	160	unsigned int save_sr10;
	161	unsigned int save_sr11;
	162	unsigned int save_sr12;
	163	unsigned int save_sr13;
	164	unsigned int save_sr14;
	165	unsigned int save_sr15;
	166
	167	/* offset 0x180 */
	168	unsigned int save_180[8];
	169	unsigned int save_1A0[8];
	170	unsigned int save_1C0[8];
9bccf70c	171	unsigned int save_1E0[8];
de355530 A	172	unsigned int save_200[8];
	173	unsigned int save_220[8];
	174	unsigned int save_240[8];
	175	unsigned int save_260[8];
	176
9bccf70c A	177	/* offset 0x280 */
	178	} savearea;
	179
	180
	181	/*
	182	* This type of savearea contains all of the floating point context.
	183	*/
	184
	185	typedef struct savearea_fpu {
1c79356b	186
9bccf70c A	187	savearea_comm save_hdr; /* Stuff common to all saveareas */
	188
	189	unsigned int save_060[8]; /* Fill 32 bytes */
	190	/* offset 0x0080 */
	191	double save_fp0;
	192	double save_fp1;
	193	double save_fp2;
	194	double save_fp3;
	195
	196	double save_fp4;
	197	double save_fp5;
	198	double save_fp6;
	199	double save_fp7;
	200
	201	double save_fp8;
	202	double save_fp9;
	203	double save_fp10;
	204	double save_fp11;
	205
	206	double save_fp12;
	207	double save_fp13;
	208	double save_fp14;
	209	double save_fp15;
	210
	211	double save_fp16;
	212	double save_fp17;
	213	double save_fp18;
	214	double save_fp19;
	215
	216	double save_fp20;
	217	double save_fp21;
	218	double save_fp22;
	219	double save_fp23;
	220
	221	double save_fp24;
	222	double save_fp25;
	223	double save_fp26;
	224	double save_fp27;
	225
	226	double save_fp28;
	227	double save_fp29;
	228	double save_fp30;
	229	double save_fp31;
	230	/* offset 0x180 */
	231	unsigned int save_180[8];
	232	unsigned int save_1A0[8];
	233	unsigned int save_1C0[8];
	234	unsigned int save_1E0[8];
	235	unsigned int save_200[8];
	236	unsigned int save_220[8];
	237	unsigned int save_240[8];
	238	unsigned int save_260[8];
	239
	240	/* offset 0x280 */
	241	} savearea_fpu;
	242
	243
	244
	245	/*
	246	* This type of savearea contains all of the vector context.
	247	*/
	248
	249	typedef struct savearea_vec {
	250
251	savearea_comm save_hdr; /* Stuff common to all saveareas */
252
253	unsigned int save_060[7]; /* Fill 32 bytes */
254	unsigned int save_vrvalid; /* Valid registers in saved context */
255
256	/* offset 0x0080 */
257	unsigned int save_vr0[4];
258	unsigned int save_vr1[4];
259	unsigned int save_vr2[4];
260	unsigned int save_vr3[4];
261	unsigned int save_vr4[4];
262	unsigned int save_vr5[4];
263	unsigned int save_vr6[4];
264	unsigned int save_vr7[4];
265	unsigned int save_vr8[4];
266	unsigned int save_vr9[4];
267	unsigned int save_vr10[4];
268	unsigned int save_vr11[4];
269	unsigned int save_vr12[4];
270	unsigned int save_vr13[4];
271	unsigned int save_vr14[4];
272	unsigned int save_vr15[4];
273	unsigned int save_vr16[4];
274	unsigned int save_vr17[4];
275	unsigned int save_vr18[4];
276	unsigned int save_vr19[4];
277	unsigned int save_vr20[4];
278	unsigned int save_vr21[4];
279	unsigned int save_vr22[4];
280	unsigned int save_vr23[4];
281	unsigned int save_vr24[4];
282	unsigned int save_vr25[4];
283	unsigned int save_vr26[4];
284	unsigned int save_vr27[4];
285	unsigned int save_vr28[4];
286	unsigned int save_vr29[4];
287	unsigned int save_vr30[4];
288	unsigned int save_vr31[4];
289
290	/* offset 0x280 */
291	} savearea_vec;
292	#endif /* MACH_KERNEL_PRIVATE \|\| BSD_KERNEL_PRIVATE */
293
294	#ifdef MACH_KERNEL_PRIVATE
295
296	struct Saveanchor {
297
298	/*
299	* Note that this force aligned in aligned_data.s and must be in V=R storage.
300	* Also, all addresses in chains are physical. This structure can only be
301	* updated with translation and interrupts disabled. This is because it is
302	* locked during exception processing and if we were to take a PTE miss while the
303	* lock were held, well, that would be very bad now wouldn't it?
304	*/
305
de355530 A	306	unsigned int savelock; /* Lock word for savearea free list manipulation */
	307	unsigned int savepoolfwd; / Forward anchor for the free pool */
	308	unsigned int savepoolbwd; / Backward anchor for the free pool */
	309	volatile unsigned int savefree; /* Anchor for the global free list */
	310	volatile unsigned int savefreecnt; /* Number of saveareas on global free list */
	311	volatile int saveadjust; /* If 0 number of saveareas is ok, otherwise number to change (positive means grow, negative means shrink */
	312	volatile int saveinuse; /* Number of areas in use counting those on the local free list */
	313	volatile int savetarget; /* Number of savearea's needed */
	314	int savemaxcount; /* Maximum saveareas ever allocated */
	315
9bccf70c A	316
	317	};
	318
	319
	320	#define sac_cnt (4096 / sizeof(savearea)) /* Number of saveareas per page */
	321	#define sac_empty (0xFFFFFFFF << (32 - sac_cnt)) /* Mask with all entries empty */
	322	#define sac_perm 0x40000000 /* Page permanently assigned */
	323	#define sac_permb 1 /* Page permanently assigned - bit position */
	324
	325	#define LocalSaveTarget (((8 + sac_cnt - 1) / sac_cnt) * sac_cnt) /* Target for size of local savearea free list */
	326	#define LocalSaveMin (LocalSaveTarget / 2) /* Min size of local savearea free list before we grow */
	327	#define LocalSaveMax (LocalSaveTarget * 2) /* Max size of local savearea free list before we trim */
	328
	329	#define FreeListMin (2 * LocalSaveTarget * NCPUS) /* Always make sure there are enough to fill local list twice per processor */
	330	#define SaveLowHysteresis LocalSaveTarget /* The number off from target before we adjust upwards */
	331	#define SaveHighHysteresis FreeListMin /* The number off from target before we adjust downwards */
	332	#define InitialSaveAreas (2 * FreeListMin) /* The number of saveareas to make at boot time */
	333	#define InitialSaveTarget FreeListMin /* The number of saveareas for an initial target. This should be the minimum ever needed. */
	334	#define InitialSaveBloks (InitialSaveAreas + sac_cnt - 1) / sac_cnt /* The number of savearea blocks to allocate at boot */
	335
	336
de355530 A	337	void save_release(struct savearea ); / Release a save area */
	338	struct savectl save_dequeue(void); / Find and dequeue one that is all empty */
	339	unsigned int save_queue(struct savearea ); / Add a new savearea block to the free list */
	340	struct savearea save_get(void); / Obtains a savearea from the free list (returns virtual address) */
	341	struct savearea save_get_phys(void); / Obtains a savearea from the free list (returns physical address) */
	342	struct savearea save_alloc(void); / Obtains a savearea and allocates blocks if needed */
	343	struct savearea save_cpv(struct savearea ); /* Converts a physical savearea address to virtual */
	344	void save_ret(struct savearea ); / Returns a savearea to the free list */
	345	void save_ret_phys(struct savearea ); / Returns a savearea to the free list */
	346	void save_adjust(void); /* Adjust size of the global free list */
	347	struct savearea_comm save_trim_freet(void); / Remove free pages from savearea pool */
	348
9bccf70c A	349	#endif /* MACH_KERNEL_PRIVATE */
	350	#endif /* __APPLE_API_PRIVATE */
	351
	352	#endif /* ndef ASSEMBLER */
1c79356b	353
9bccf70c A	354	#define SAVattach 0x80000000 /* Savearea has valid context */
	355	#define SAVrststk 0x00010000 /* Indicates that the current stack should be reset to empty */
	356	#define SAVsyscall 0x00020000 /* Indicates that the savearea is associated with a syscall */
	357	#define SAVredrive 0x00040000 /* Indicates that the low-level fault handler associated */
	358	#define SAVtype 0x0000FF00 /* Shows type of savearea */
	359	#define SAVtypeshft 8 /* Shift to position type */
	360	#define SAVempty 0x86 /* Savearea is on free list */
	361	#define SAVgeneral 0x01 /* Savearea contains general context */
	362	#define SAVfloat 0x02 /* Savearea contains floating point context */
	363	#define SAVvector 0x03 /* Savearea contains vector context */
1c79356b	364
9bccf70c	365	#endif /* _PPC_SAVEAREA_H_ */