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

/*
 * Copyright (c) 2000-2004 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@
 */
/*
 * @OSF_COPYRIGHT@
 */

#ifndef _PPC_PROC_REG_H_
#define _PPC_PROC_REG_H_

#include <mach/boolean.h>

/* Define some useful masks that convert from bit numbers */

#if __PPC__
#ifdef __BIG_ENDIAN__
#ifndef ENDIAN_MASK
#define ENDIAN_MASK(val,size) (1 << ((size-1) - val))
#endif
#else
#error code not ported to little endian targets yet
#endif /* __BIG_ENDIAN__ */
#endif /* __PPC__ */

#define MASK32(PART)	ENDIAN_MASK(PART ## _BIT, 32)
#define MASK16(PART)	ENDIAN_MASK(PART ## _BIT, 16)
#define MASK8(PART)	ENDIAN_MASK(PART ## _BIT, 8)

#undef MASK
#define MASK(PART)	MASK32(PART)

#define BITS_PER_WORD	32
#define BITS_PER_WORD_POW2 5

/* Defines for decoding the MSR bits */

#define MSR_SF_BIT		0
#define MSR_HV_BIT		3
#define MSR_RES1_BIT	1
#define MSR_RES2_BIT	2
#define MSR_RES3_BIT	3
#define MSR_RES4_BIT	4
#define MSR_RES5_BIT	5
#define MSR_VEC_BIT		6
#define MSR_RES7_BIT	7
#define MSR_RES8_BIT	8
#define MSR_RES9_BIT	9
#define MSR_RES10_BIT	10
#define MSR_RES11_BIT	11
#define MSR_KEY_BIT	12	/* Key bit on 603e (not on 603) */
#define	MSR_POW_BIT	13
#define MSR_TGPR_BIT	14	/* Temporary GPR mappings on 603/603e */
#define MSR_ILE_BIT	15
#define	MSR_EE_BIT	16
#define	MSR_PR_BIT	17
#define MSR_FP_BIT	18
#define MSR_ME_BIT	19
#define MSR_FE0_BIT	20
#define MSR_SE_BIT	21
#define	MSR_BE_BIT	22
#define MSR_FE1_BIT	23
#define MSR_RES24_BIT	24	/* AL bit in power architectures */
#define MSR_IP_BIT      25
#define MSR_IR_BIT      26
#define MSR_DR_BIT      27
#define MSR_RES28_BIT	28
#define MSR_PM_BIT	29
#define	MSR_RI_BIT	30
#define MSR_LE_BIT	31

/* MSR for kernel mode, interrupts disabled, running in virtual mode */
#define MSR_SUPERVISOR_INT_OFF (MASK(MSR_ME) | MASK(MSR_IR) | MASK(MSR_DR))  

/* MSR for above but with interrupts enabled */
#define MSR_SUPERVISOR_INT_ON (MSR_SUPERVISOR_INT_OFF | MASK(MSR_EE))

/* MSR for physical mode code */
#define MSR_VM_OFF     (MASK(MSR_ME))

/* MSR for physical instruction, virtual data */
#define MSR_PHYS_INST_VIRT_DATA     (MASK(MSR_ME) | MASK(MSR_IR))

/* MSR mask for user-exported bits - identify bits that must be set/reset */

/* SET - external exceptions, machine check, vm on, user-level privs */
#define MSR_EXPORT_MASK_SET	(MASK(MSR_EE)| MASK(MSR_ME)| \
				 MASK(MSR_IR)|MASK(MSR_DR)|MASK(MSR_PR))

/* only the following bits may be changed by a task */
#define MSR_IMPORT_BITS (MASK(MSR_FE0)|MASK(MSR_SE)|MASK(MSR_BE)| \
			 MASK(MSR_FE1)| MASK(MSR_PM) | MASK(MSR_LE))

#define MSR_PREPARE_FOR_IMPORT(origmsr, newmsr) \
	((origmsr & ~MSR_IMPORT_BITS) | (newmsr & MSR_IMPORT_BITS))

#define MSR_VEC_ON	(MASK(MSR_VEC))

#define USER_MODE(msr) (msr & MASK(MSR_PR) ? TRUE : FALSE)

/* seg reg values must be simple expressions so that assembler can cope */
#define SEG_REG_INVALID 0x0000
#define KERNEL_SEG_REG0_VALUE 0x20000000 /* T=0,Ks=0,Ku=1 PPC_SID_KERNEL=0*/

/* For SEG_REG_PROT we have T=0, Ks=0, Ku=1 */
#define SEG_REG_PROT	0x20000000   /* seg regs should have these bits set */

/* SR_COPYIN is used for copyin/copyout+remapping and must be
 * saved and restored in the thread context.
 */
/* SR_UNUSED_BY_KERN is unused by the kernel, and thus contains
 * the space ID of the currently interrupted user task immediately
 * after an exception and before interrupts are reenabled. It's used
 * purely for an assert.
 */

/* SR_KERNEL used for asserts... */

#define SR_COPYIN	sr14
#define SR_UNUSED_BY_KERN sr13
#define SR_KERNEL 	sr0

#define SR_UNUSED_BY_KERN_NUM 13
#define SR_COPYIN_NAME	sr14
#define SR_COPYIN_NUM	14
#define BAT_INVALID 0


/* DSISR bits on data access exceptions */

#define DSISR_IO_BIT		0	/* NOT USED on 601 */
#define DSISR_HASH_BIT		1
#define DSISR_NOEX_BIT		3
#define DSISR_PROT_BIT		4
#define DSISR_IO_SPC_BIT	5
#define DSISR_WRITE_BIT		6
#define DSISR_WATCH_BIT		9
#define DSISR_EIO_BIT		11

#define dsiMiss 			0x40000000
#define dsiMissb 			1
#define dsiNoEx				0x10000000
#define dsiProt				0x08000000
#define dsiInvMode			0x04000000
#define dsiStore			0x02000000
#define dsiAC				0x00400000
#define dsiSeg				0x00200000
#define dsiValid			0x5E600000
#define dsiLinkage			0x00010000	/* Linkage mapping type - software flag */
#define dsiLinkageb			15			/* Linkage mapping type - software flag */
#define dsiSoftware			0x0000FFFF

/* SRR1 bits on data/instruction translation exceptions */

#define SRR1_TRANS_HASH_BIT	1
#define SRR1_TRANS_IO_BIT	3
#define SRR1_TRANS_PROT_BIT	4
#define SRR1_TRANS_NO_PTE_BIT	10

/* SRR1 bits on program exceptions */

#define SRR1_PRG_FE_BIT		11
#define SRR1_PRG_ILL_INS_BIT	12
#define SRR1_PRG_PRV_INS_BIT	13
#define SRR1_PRG_TRAP_BIT	14

/*
 * Virtual to physical mapping macros/structures.
 * IMPORTANT NOTE: there is one mapping per HW page, not per MACH page.
 */

#define PTE1_WIMG_GUARD_BIT	28	/* Needed for assembler */
#define PTE1_REFERENCED_BIT	23	/* ditto */
#define PTE1_CHANGED_BIT	24
#define PTE0_HASH_ID_BIT	25

#define PTE_WIMG_CB_CACHED_COHERENT		0 	/* cached, writeback, coherent (default) */
#define PTE_WIMG_CB_CACHED_COHERENT_GUARDED	1 	/* cached, writeback, coherent, guarded */
#define PTE_WIMG_UNCACHED_COHERENT		2	/* uncached, coherentt */
#define PTE_WIMG_UNCACHED_COHERENT_GUARDED	3	/* uncached, coherent, guarded */

#define PTE_WIMG_DEFAULT 	PTE_WIMG_CB_CACHED_COHERENT
#define PTE_WIMG_IO		PTE_WIMG_UNCACHED_COHERENT_GUARDED


#ifndef ASSEMBLER
#ifdef __GNUC__

/* Structures and types for machine registers */


/*
 * C-helper inline functions for accessing machine registers follow.
 */


/*
 * Various memory/IO synchronisation instructions
 */

        /*	Use eieio as a memory barrier to order stores.
         *	Useful for device control and PTE maintenance.
         */

#define eieio() \
        __asm__ volatile("eieio")

        /* 	Use sync to ensure previous stores have completed.
        	This is  required when manipulating locks and/or
        	maintaining PTEs or other shared structures on SMP 
        	machines.
        */

#define sync() \
        __asm__ volatile("sync")

        /*	Use isync to sychronize context; that is, the ensure
        	no prefetching of instructions happen before the
        	instruction.
        */

#define isync() \
        __asm__ volatile("isync")


/*
 * Access to various system registers
 */

extern unsigned int mflr(void);

extern __inline__ unsigned int mflr(void)
{
        unsigned int result;
        __asm__ volatile("mflr %0" : "=r" (result));
        return result;
}

extern unsigned int mfpvr(void);

extern __inline__ unsigned int mfpvr(void)
{
        unsigned int result;
        __asm__ ("mfpvr %0" : "=r" (result));
        return result;
}

/* mtmsr might need syncs etc around it, don't provide simple
 * inline macro
 */

extern unsigned int mfmsr(void);

extern __inline__ unsigned int mfmsr(void)
{
        unsigned int result;
        __asm__ volatile("mfmsr %0" : "=r" (result));
        return result;
}


extern unsigned int mfdar(void);

extern __inline__ unsigned int mfdar(void)
{
        unsigned int result;
        __asm__ volatile("mfdar %0" : "=r" (result));
        return result;
}

extern void mtdec(unsigned int val);

extern __inline__ void mtdec(unsigned int val)
{
        __asm__ volatile("mtdec %0" : : "r" (val));
        return;
}

extern void mttb(unsigned int val);

extern __inline__ void mttb(unsigned int val)
{
        __asm__ volatile("mtspr tbl, %0" : : "r" (val));
        return;
}

extern unsigned int mftb(void);

extern __inline__ unsigned int mftb(void)
{
        unsigned int result;
        __asm__ volatile("mftb %0" : "=r" (result));
        return result;
}

extern void mttbu(unsigned int val);

extern __inline__ void mttbu(unsigned int val)
{
        __asm__ volatile("mtspr tbu, %0" : : "r" (val));
        return;
}

extern unsigned int mftbu(void);

extern __inline__ unsigned int mftbu(void)
{
        unsigned int result;
        __asm__ volatile("mftbu %0" : "=r" (result));
        return result;
}

extern unsigned int mfl2cr(void);

extern __inline__ unsigned int mfl2cr(void)
{
  unsigned int result;
  __asm__ volatile("mfspr %0, l2cr" : "=r" (result));
  return result;
}

extern unsigned int cntlzw(unsigned int num);

extern __inline__ unsigned int cntlzw(unsigned int num)
{
  unsigned int result;
  __asm__ volatile("cntlzw %0, %1" : "=r" (result) : "r" (num));
  return result;
}


/* functions for doing byte reversed loads and stores */

extern unsigned int lwbrx(unsigned int addr);

extern __inline__ unsigned int lwbrx(unsigned int addr)
{
  unsigned int result;
  __asm__ volatile("lwbrx %0, 0, %1" : "=r" (result) : "r" (addr));
  return result;
}

extern void stwbrx(unsigned int data, unsigned int addr);

extern __inline__ void stwbrx(unsigned int data, unsigned int addr)
{
  __asm__ volatile("stwbrx %0, 0, %1" : : "r" (data), "r" (addr));
}

/* Performance Monitor Register access routines */
extern unsigned long   mfmmcr0(void);
extern void                    mtmmcr0(unsigned long);
extern unsigned long   mfmmcr1(void);
extern void                    mtmmcr1(unsigned long);
extern unsigned long   mfmmcr2(void);
extern void                    mtmmcr2(unsigned long);
extern unsigned long   mfpmc1(void);
extern void                    mtpmc1(unsigned long);
extern unsigned long   mfpmc2(void);
extern void                    mtpmc2(unsigned long);
extern unsigned long   mfpmc3(void);
extern void                    mtpmc3(unsigned long);
extern unsigned long   mfpmc4(void);
extern void                    mtpmc4(unsigned long);
extern unsigned long   mfsia(void);
extern unsigned long   mfsda(void);

/* macros since the argument n is a hard-coded constant */

#define mtsprg(n, reg)  __asm__ volatile("mtsprg  " # n ", %0" : : "r" (reg))
#define mfsprg(reg, n)  __asm__ volatile("mfsprg  %0, " # n : "=r" (reg))

#define mtspr(spr, val)  __asm__ volatile("mtspr  " # spr ", %0" : : "r" (val))
#define mfspr(reg, spr)  __asm__ volatile("mfspr  %0, " # spr : "=r" (reg))

#endif /* __GNUC__ */
#endif /* !ASSEMBLER */

#endif /* _PPC_PROC_REG_H_ */
Commit	Line	Data
1c79356b	1	/*
91447636	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
1c79356b	3	*
6601e61a	4	* @APPLE_LICENSE_HEADER_START@
1c79356b	5	*
6601e61a 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.
8f6c56a5	11	*
6601e61a A	12	* This Original Code and all software distributed under the License are
6601e61a A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
6601e61a 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.
8f6c56a5	19	*
6601e61a	20	* @APPLE_LICENSE_HEADER_END@
1c79356b A	21	*/
	22	/*
	23	* @OSF_COPYRIGHT@
	24	*/
	25
	26	#ifndef _PPC_PROC_REG_H_
	27	#define _PPC_PROC_REG_H_
	28
	29	#include <mach/boolean.h>
	30
	31	/* Define some useful masks that convert from bit numbers */
	32
	33	#if __PPC__
55e303ae	34	#ifdef __BIG_ENDIAN__
1c79356b A	35	#ifndef ENDIAN_MASK
	36	#define ENDIAN_MASK(val,size) (1 << ((size-1) - val))
	37	#endif
	38	#else
	39	#error code not ported to little endian targets yet
55e303ae	40	#endif /* __BIG_ENDIAN__ */
1c79356b A	41	#endif /* __PPC__ */
	42
	43	#define MASK32(PART) ENDIAN_MASK(PART ## _BIT, 32)
	44	#define MASK16(PART) ENDIAN_MASK(PART ## _BIT, 16)
	45	#define MASK8(PART) ENDIAN_MASK(PART ## _BIT, 8)
	46
	47	#undef MASK
	48	#define MASK(PART) MASK32(PART)
	49
	50	#define BITS_PER_WORD 32
	51	#define BITS_PER_WORD_POW2 5
	52
	53	/* Defines for decoding the MSR bits */
	54
55e303ae A	55	#define MSR_SF_BIT 0
55e303ae A	56	#define MSR_HV_BIT 3
1c79356b A	57	#define MSR_RES1_BIT 1
	58	#define MSR_RES2_BIT 2
	59	#define MSR_RES3_BIT 3
	60	#define MSR_RES4_BIT 4
	61	#define MSR_RES5_BIT 5
	62	#define MSR_VEC_BIT 6
	63	#define MSR_RES7_BIT 7
	64	#define MSR_RES8_BIT 8
	65	#define MSR_RES9_BIT 9
	66	#define MSR_RES10_BIT 10
	67	#define MSR_RES11_BIT 11
	68	#define MSR_KEY_BIT 12 /* Key bit on 603e (not on 603) */
	69	#define MSR_POW_BIT 13
	70	#define MSR_TGPR_BIT 14 /* Temporary GPR mappings on 603/603e */
	71	#define MSR_ILE_BIT 15
	72	#define MSR_EE_BIT 16
	73	#define MSR_PR_BIT 17
	74	#define MSR_FP_BIT 18
	75	#define MSR_ME_BIT 19
	76	#define MSR_FE0_BIT 20
	77	#define MSR_SE_BIT 21
	78	#define MSR_BE_BIT 22
	79	#define MSR_FE1_BIT 23
	80	#define MSR_RES24_BIT 24 /* AL bit in power architectures */
	81	#define MSR_IP_BIT 25
	82	#define MSR_IR_BIT 26
	83	#define MSR_DR_BIT 27
	84	#define MSR_RES28_BIT 28
	85	#define MSR_PM_BIT 29
	86	#define MSR_RI_BIT 30
	87	#define MSR_LE_BIT 31
	88
	89	/* MSR for kernel mode, interrupts disabled, running in virtual mode */
	90	#define MSR_SUPERVISOR_INT_OFF (MASK(MSR_ME) \| MASK(MSR_IR) \| MASK(MSR_DR))
	91
	92	/* MSR for above but with interrupts enabled */
	93	#define MSR_SUPERVISOR_INT_ON (MSR_SUPERVISOR_INT_OFF \| MASK(MSR_EE))
	94
	95	/* MSR for physical mode code */
	96	#define MSR_VM_OFF (MASK(MSR_ME))
	97
	98	/* MSR for physical instruction, virtual data */
	99	#define MSR_PHYS_INST_VIRT_DATA (MASK(MSR_ME) \| MASK(MSR_IR))
	100
	101	/* MSR mask for user-exported bits - identify bits that must be set/reset */
	102
	103	/* SET - external exceptions, machine check, vm on, user-level privs */
	104	#define MSR_EXPORT_MASK_SET (MASK(MSR_EE)\| MASK(MSR_ME)\| \
	105	MASK(MSR_IR)\|MASK(MSR_DR)\|MASK(MSR_PR))
	106
	107	/* only the following bits may be changed by a task */
	108	#define MSR_IMPORT_BITS (MASK(MSR_FE0)\|MASK(MSR_SE)\|MASK(MSR_BE)\| \
	109	MASK(MSR_FE1)\| MASK(MSR_PM) \| MASK(MSR_LE))
	110
	111	#define MSR_PREPARE_FOR_IMPORT(origmsr, newmsr) \
	112	((origmsr & ~MSR_IMPORT_BITS) \| (newmsr & MSR_IMPORT_BITS))
	113
	114	#define MSR_VEC_ON (MASK(MSR_VEC))
	115
	116	#define USER_MODE(msr) (msr & MASK(MSR_PR) ? TRUE : FALSE)
	117
	118	/* seg reg values must be simple expressions so that assembler can cope */
	119	#define SEG_REG_INVALID 0x0000
	120	#define KERNEL_SEG_REG0_VALUE 0x20000000 /* T=0,Ks=0,Ku=1 PPC_SID_KERNEL=0*/
121
1c79356b A	122	/* For SEG_REG_PROT we have T=0, Ks=0, Ku=1 */
	123	#define SEG_REG_PROT 0x20000000 /* seg regs should have these bits set */
	124
	125	/* SR_COPYIN is used for copyin/copyout+remapping and must be
	126	* saved and restored in the thread context.
	127	*/
	128	/* SR_UNUSED_BY_KERN is unused by the kernel, and thus contains
	129	* the space ID of the currently interrupted user task immediately
	130	* after an exception and before interrupts are reenabled. It's used
	131	* purely for an assert.
	132	*/
	133
	134	/* SR_KERNEL used for asserts... */
	135
	136	#define SR_COPYIN sr14
	137	#define SR_UNUSED_BY_KERN sr13
	138	#define SR_KERNEL sr0
	139
	140	#define SR_UNUSED_BY_KERN_NUM 13
	141	#define SR_COPYIN_NAME sr14
	142	#define SR_COPYIN_NUM 14
55e303ae	143	#define BAT_INVALID 0
1c79356b A	144
	145
	146	/* DSISR bits on data access exceptions */
	147
	148	#define DSISR_IO_BIT 0 /* NOT USED on 601 */
	149	#define DSISR_HASH_BIT 1
55e303ae	150	#define DSISR_NOEX_BIT 3
1c79356b A	151	#define DSISR_PROT_BIT 4
	152	#define DSISR_IO_SPC_BIT 5
	153	#define DSISR_WRITE_BIT 6
	154	#define DSISR_WATCH_BIT 9
	155	#define DSISR_EIO_BIT 11
	156
55e303ae A	157	#define dsiMiss 0x40000000
	158	#define dsiMissb 1
	159	#define dsiNoEx 0x10000000
	160	#define dsiProt 0x08000000
	161	#define dsiInvMode 0x04000000
	162	#define dsiStore 0x02000000
	163	#define dsiAC 0x00400000
	164	#define dsiSeg 0x00200000
	165	#define dsiValid 0x5E600000
91447636 A	166	#define dsiLinkage 0x00010000 /* Linkage mapping type - software flag */
91447636 A	167	#define dsiLinkageb 15 /* Linkage mapping type - software flag */
55e303ae A	168	#define dsiSoftware 0x0000FFFF
55e303ae A	169
1c79356b A	170	/* SRR1 bits on data/instruction translation exceptions */
	171
	172	#define SRR1_TRANS_HASH_BIT 1
	173	#define SRR1_TRANS_IO_BIT 3
	174	#define SRR1_TRANS_PROT_BIT 4
	175	#define SRR1_TRANS_NO_PTE_BIT 10
	176
	177	/* SRR1 bits on program exceptions */
	178
	179	#define SRR1_PRG_FE_BIT 11
	180	#define SRR1_PRG_ILL_INS_BIT 12
	181	#define SRR1_PRG_PRV_INS_BIT 13
	182	#define SRR1_PRG_TRAP_BIT 14
	183
1c79356b A	184	/*
	185	* Virtual to physical mapping macros/structures.
	186	* IMPORTANT NOTE: there is one mapping per HW page, not per MACH page.
	187	*/
	188
1c79356b A	189	#define PTE1_WIMG_GUARD_BIT 28 /* Needed for assembler */
	190	#define PTE1_REFERENCED_BIT 23 /* ditto */
	191	#define PTE1_CHANGED_BIT 24
	192	#define PTE0_HASH_ID_BIT 25
	193
55e303ae A	194	#define PTE_WIMG_CB_CACHED_COHERENT 0 /* cached, writeback, coherent (default) */
	195	#define PTE_WIMG_CB_CACHED_COHERENT_GUARDED 1 /* cached, writeback, coherent, guarded */
	196	#define PTE_WIMG_UNCACHED_COHERENT 2 /* uncached, coherentt */
	197	#define PTE_WIMG_UNCACHED_COHERENT_GUARDED 3 /* uncached, coherent, guarded */
9bccf70c A	198
	199	#define PTE_WIMG_DEFAULT PTE_WIMG_CB_CACHED_COHERENT
	200	#define PTE_WIMG_IO PTE_WIMG_UNCACHED_COHERENT_GUARDED
	201
	202
1c79356b	203
1c79356b A	204	#ifndef ASSEMBLER
	205	#ifdef __GNUC__
	206
1c79356b A	207	/* Structures and types for machine registers */
1c79356b A	208
1c79356b A	209
	210	/*
	211	* C-helper inline functions for accessing machine registers follow.
	212	*/
	213
	214
1c79356b A	215	/*
	216	* Various memory/IO synchronisation instructions
	217	*/
	218
	219	/* Use eieio as a memory barrier to order stores.
	220	* Useful for device control and PTE maintenance.
	221	*/
	222
	223	#define eieio() \
	224	__asm__ volatile("eieio")
	225
	226	/* Use sync to ensure previous stores have completed.
	227	This is required when manipulating locks and/or
	228	maintaining PTEs or other shared structures on SMP
	229	machines.
	230	*/
	231
	232	#define sync() \
	233	__asm__ volatile("sync")
	234
	235	/* Use isync to sychronize context; that is, the ensure
	236	no prefetching of instructions happen before the
	237	instruction.
	238	*/
	239
	240	#define isync() \
	241	__asm__ volatile("isync")
	242
	243
1c79356b A	244	/*
	245	* Access to various system registers
	246	*/
	247
	248	extern unsigned int mflr(void);
	249
	250	extern __inline__ unsigned int mflr(void)
	251	{
	252	unsigned int result;
	253	__asm__ volatile("mflr %0" : "=r" (result));
	254	return result;
	255	}
	256
	257	extern unsigned int mfpvr(void);
	258
	259	extern __inline__ unsigned int mfpvr(void)
	260	{
	261	unsigned int result;
	262	__asm__ ("mfpvr %0" : "=r" (result));
	263	return result;
	264	}
	265
	266	/* mtmsr might need syncs etc around it, don't provide simple
	267	* inline macro
	268	*/
	269
	270	extern unsigned int mfmsr(void);
	271
	272	extern __inline__ unsigned int mfmsr(void)
	273	{
	274	unsigned int result;
	275	__asm__ volatile("mfmsr %0" : "=r" (result));
	276	return result;
	277	}
	278
1c79356b A	279
	280	extern unsigned int mfdar(void);
	281
	282	extern __inline__ unsigned int mfdar(void)
	283	{
	284	unsigned int result;
	285	__asm__ volatile("mfdar %0" : "=r" (result));
	286	return result;
	287	}
	288
	289	extern void mtdec(unsigned int val);
	290
	291	extern __inline__ void mtdec(unsigned int val)
	292	{
	293	__asm__ volatile("mtdec %0" : : "r" (val));
	294	return;
	295	}
	296
1c79356b A	297	extern void mttb(unsigned int val);
	298
	299	extern __inline__ void mttb(unsigned int val)
	300	{
	301	__asm__ volatile("mtspr tbl, %0" : : "r" (val));
	302	return;
	303	}
	304
	305	extern unsigned int mftb(void);
	306
	307	extern __inline__ unsigned int mftb(void)
	308	{
	309	unsigned int result;
	310	__asm__ volatile("mftb %0" : "=r" (result));
	311	return result;
	312	}
	313
	314	extern void mttbu(unsigned int val);
	315
	316	extern __inline__ void mttbu(unsigned int val)
	317	{
	318	__asm__ volatile("mtspr tbu, %0" : : "r" (val));
	319	return;
	320	}
	321
	322	extern unsigned int mftbu(void);
	323
	324	extern __inline__ unsigned int mftbu(void)
	325	{
	326	unsigned int result;
	327	__asm__ volatile("mftbu %0" : "=r" (result));
	328	return result;
	329	}
	330
1c79356b A	331	extern unsigned int mfl2cr(void);
	332
	333	extern __inline__ unsigned int mfl2cr(void)
	334	{
	335	unsigned int result;
	336	__asm__ volatile("mfspr %0, l2cr" : "=r" (result));
	337	return result;
	338	}
	339
	340	extern unsigned int cntlzw(unsigned int num);
	341
	342	extern __inline__ unsigned int cntlzw(unsigned int num)
	343	{
	344	unsigned int result;
	345	__asm__ volatile("cntlzw %0, %1" : "=r" (result) : "r" (num));
	346	return result;
	347	}
	348
	349
	350	/* functions for doing byte reversed loads and stores */
	351
	352	extern unsigned int lwbrx(unsigned int addr);
	353
	354	extern __inline__ unsigned int lwbrx(unsigned int addr)
	355	{
	356	unsigned int result;
	357	__asm__ volatile("lwbrx %0, 0, %1" : "=r" (result) : "r" (addr));
	358	return result;
	359	}
	360
	361	extern void stwbrx(unsigned int data, unsigned int addr);
	362
	363	extern __inline__ void stwbrx(unsigned int data, unsigned int addr)
	364	{
	365	__asm__ volatile("stwbrx %0, 0, %1" : : "r" (data), "r" (addr));
	366	}
	367
	368	/* Performance Monitor Register access routines */
	369	extern unsigned long mfmmcr0(void);
	370	extern void mtmmcr0(unsigned long);
	371	extern unsigned long mfmmcr1(void);
	372	extern void mtmmcr1(unsigned long);
	373	extern unsigned long mfmmcr2(void);
	374	extern void mtmmcr2(unsigned long);
	375	extern unsigned long mfpmc1(void);
	376	extern void mtpmc1(unsigned long);
	377	extern unsigned long mfpmc2(void);
	378	extern void mtpmc2(unsigned long);
	379	extern unsigned long mfpmc3(void);
	380	extern void mtpmc3(unsigned long);
	381	extern unsigned long mfpmc4(void);
	382	extern void mtpmc4(unsigned long);
	383	extern unsigned long mfsia(void);
	384	extern unsigned long mfsda(void);
	385
	386	/* macros since the argument n is a hard-coded constant */
	387
1c79356b A	388	#define mtsprg(n, reg) __asm__ volatile("mtsprg " # n ", %0" : : "r" (reg))
	389	#define mfsprg(reg, n) __asm__ volatile("mfsprg %0, " # n : "=r" (reg))
	390
	391	#define mtspr(spr, val) __asm__ volatile("mtspr " # spr ", %0" : : "r" (val))
	392	#define mfspr(reg, spr) __asm__ volatile("mfspr %0, " # spr : "=r" (reg))
	393
	394	#endif /* __GNUC__ */
	395	#endif /* !ASSEMBLER */
	396
	397	#endif /* _PPC_PROC_REG_H_ */