[deliverable/linux.git] / include / asm-powerpc / processor.h

#ifndef _ASM_POWERPC_PROCESSOR_H
#define _ASM_POWERPC_PROCESSOR_H

/*
 * Copyright (C) 2001 PPC 64 Team, IBM Corp
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <asm/reg.h>

#ifndef __ASSEMBLY__
#include <linux/compiler.h>
#include <asm/ptrace.h>
#include <asm/types.h>

/* We do _not_ want to define new machine types at all, those must die
 * in favor of using the device-tree
 * -- BenH.
 */

/* PREP sub-platform types see residual.h for these */
#define _PREP_Motorola	0x01	/* motorola prep */
#define _PREP_Firm	0x02	/* firmworks prep */
#define _PREP_IBM	0x00	/* ibm prep */
#define _PREP_Bull	0x03	/* bull prep */

/* CHRP sub-platform types. These are arbitrary */
#define _CHRP_Motorola	0x04	/* motorola chrp, the cobra */
#define _CHRP_IBM	0x05	/* IBM chrp, the longtrail and longtrail 2 */
#define _CHRP_Pegasos	0x06	/* Genesi/bplan's Pegasos and Pegasos2 */
#define _CHRP_briq	0x07	/* TotalImpact's briQ */

#if defined(__KERNEL__) && defined(CONFIG_PPC32)

extern int _chrp_type;

#ifdef CONFIG_PPC_PREP

/* what kind of prep workstation we are */
extern int _prep_type;

#endif /* CONFIG_PPC_PREP */

#endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr() ({ __label__ _l; _l: &&_l;})

/* Macros for adjusting thread priority (hardware multi-threading) */
#define HMT_very_low()   asm volatile("or 31,31,31   # very low priority")
#define HMT_low()	 asm volatile("or 1,1,1	     # low priority")
#define HMT_medium_low() asm volatile("or 6,6,6      # medium low priority")
#define HMT_medium()	 asm volatile("or 2,2,2	     # medium priority")
#define HMT_medium_high() asm volatile("or 5,5,5      # medium high priority")
#define HMT_high()	 asm volatile("or 3,3,3	     # high priority")

#ifdef __KERNEL__

extern int have_of;

struct task_struct;
void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
void release_thread(struct task_struct *);

/* Prepare to copy thread state - unlazy all lazy status */
extern void prepare_to_copy(struct task_struct *tsk);

/* Create a new kernel thread. */
extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);

/* Lazy FPU handling on uni-processor */
extern struct task_struct *last_task_used_math;
extern struct task_struct *last_task_used_altivec;
extern struct task_struct *last_task_used_spe;

#ifdef CONFIG_PPC32
#define TASK_SIZE	(CONFIG_TASK_SIZE)

/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE	(TASK_SIZE / 8 * 3)
#endif

#ifdef CONFIG_PPC64
/* 64-bit user address space is 44-bits (16TB user VM) */
#define TASK_SIZE_USER64 (0x0000100000000000UL)

/* 
 * 32-bit user address space is 4GB - 1 page 
 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
 */
#define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))

#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
		TASK_SIZE_USER32 : TASK_SIZE_USER64)
#define TASK_SIZE	  TASK_SIZE_OF(current)

/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
#define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))

#define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
		TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
#endif

#ifdef __KERNEL__
#ifdef __powerpc64__

#define STACK_TOP_USER64 TASK_SIZE_USER64
#define STACK_TOP_USER32 TASK_SIZE_USER32

#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
		   STACK_TOP_USER32 : STACK_TOP_USER64)

#define STACK_TOP_MAX STACK_TOP_USER64

#else /* __powerpc64__ */

#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX	STACK_TOP

#endif /* __powerpc64__ */
#endif /* __KERNEL__ */

typedef struct {
	unsigned long seg;
} mm_segment_t;

struct thread_struct {
	unsigned long	ksp;		/* Kernel stack pointer */
	unsigned long	ksp_limit;	/* if ksp <= ksp_limit stack overflow */

#ifdef CONFIG_PPC64
	unsigned long	ksp_vsid;
#endif
	struct pt_regs	*regs;		/* Pointer to saved register state */
	mm_segment_t	fs;		/* for get_fs() validation */
#ifdef CONFIG_PPC32
	void		*pgdir;		/* root of page-table tree */
#endif
#if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
	unsigned long	dbcr0;		/* debug control register values */
	unsigned long	dbcr1;
#endif
	double		fpr[32];	/* Complete floating point set */
	struct {			/* fpr ... fpscr must be contiguous */

		unsigned int pad;
		unsigned int val;	/* Floating point status */
	} fpscr;
	int		fpexc_mode;	/* floating-point exception mode */
	unsigned int	align_ctl;	/* alignment handling control */
#ifdef CONFIG_PPC64
	unsigned long	start_tb;	/* Start purr when proc switched in */
	unsigned long	accum_tb;	/* Total accumilated purr for process */
#endif
	unsigned long	dabr;		/* Data address breakpoint register */
#ifdef CONFIG_ALTIVEC
	/* Complete AltiVec register set */
	vector128	vr[32] __attribute__((aligned(16)));
	/* AltiVec status */
	vector128	vscr __attribute__((aligned(16)));
	unsigned long	vrsave;
	int		used_vr;	/* set if process has used altivec */
#endif /* CONFIG_ALTIVEC */
#ifdef CONFIG_SPE
	unsigned long	evr[32];	/* upper 32-bits of SPE regs */
	u64		acc;		/* Accumulator */
	unsigned long	spefscr;	/* SPE & eFP status */
	int		used_spe;	/* set if process has used spe */
#endif /* CONFIG_SPE */
};

#define ARCH_MIN_TASKALIGN 16

#define INIT_SP		(sizeof(init_stack) + (unsigned long) &init_stack)
#define INIT_SP_LIMIT \
	(_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)


#ifdef CONFIG_PPC32
#define INIT_THREAD { \
	.ksp = INIT_SP, \
	.ksp_limit = INIT_SP_LIMIT, \
	.fs = KERNEL_DS, \
	.pgdir = swapper_pg_dir, \
	.fpexc_mode = MSR_FE0 | MSR_FE1, \
}
#else
#define INIT_THREAD  { \
	.ksp = INIT_SP, \
	.ksp_limit = INIT_SP_LIMIT, \
	.regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
	.fs = KERNEL_DS, \
	.fpr = {0}, \
	.fpscr = { .val = 0, }, \
	.fpexc_mode = 0, \
}
#endif

/*
 * Return saved PC of a blocked thread. For now, this is the "user" PC
 */
#define thread_saved_pc(tsk)    \
        ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)

unsigned long get_wchan(struct task_struct *p);

#define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
#define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)

/* Get/set floating-point exception mode */
#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))

extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);

#define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
#define SET_ENDIAN(tsk, val) set_endian((tsk), (val))

extern int get_endian(struct task_struct *tsk, unsigned long adr);
extern int set_endian(struct task_struct *tsk, unsigned int val);

#define GET_UNALIGN_CTL(tsk, adr)	get_unalign_ctl((tsk), (adr))
#define SET_UNALIGN_CTL(tsk, val)	set_unalign_ctl((tsk), (val))

extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);

static inline unsigned int __unpack_fe01(unsigned long msr_bits)
{
	return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
}

static inline unsigned long __pack_fe01(unsigned int fpmode)
{
	return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
}

#ifdef CONFIG_PPC64
#define cpu_relax()	do { HMT_low(); HMT_medium(); barrier(); } while (0)
#else
#define cpu_relax()	barrier()
#endif

/* Check that a certain kernel stack pointer is valid in task_struct p */
int validate_sp(unsigned long sp, struct task_struct *p,
                       unsigned long nbytes);

/*
 * Prefetch macros.
 */
#define ARCH_HAS_PREFETCH
#define ARCH_HAS_PREFETCHW
#define ARCH_HAS_SPINLOCK_PREFETCH

static inline void prefetch(const void *x)
{
	if (unlikely(!x))
		return;

	__asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
}

static inline void prefetchw(const void *x)
{
	if (unlikely(!x))
		return;

	__asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
}

#define spin_lock_prefetch(x)	prefetchw(x)

#ifdef CONFIG_PPC64
#define HAVE_ARCH_PICK_MMAP_LAYOUT
#endif

#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_PROCESSOR_H */
Commit	Line	Data
9f04b9e3 PM	1	#ifndef _ASM_POWERPC_PROCESSOR_H
9f04b9e3 PM	2	#define _ASM_POWERPC_PROCESSOR_H
1da177e4 LT	3
1da177e4 LT	4	/*
9f04b9e3 PM	5	* Copyright (C) 2001 PPC 64 Team, IBM Corp
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
1da177e4	11	*/
1da177e4	12
9f04b9e3	13	#include <asm/reg.h>
1da177e4	14
9f04b9e3 PM	15	#ifndef __ASSEMBLY__
9f04b9e3 PM	16	#include <linux/compiler.h>
1da177e4 LT	17	#include <asm/ptrace.h>
1da177e4 LT	18	#include <asm/types.h>
1da177e4	19
799d6046 PM	20	/* We do _not_ want to define new machine types at all, those must die
	21	* in favor of using the device-tree
	22	* -- BenH.
1da177e4	23	*/
1da177e4	24
799d6046	25	/* PREP sub-platform types see residual.h for these */
1da177e4 LT	26	#define _PREP_Motorola 0x01 /* motorola prep */
	27	#define _PREP_Firm 0x02 /* firmworks prep */
	28	#define _PREP_IBM 0x00 /* ibm prep */
	29	#define _PREP_Bull 0x03 /* bull prep */
	30
799d6046	31	/* CHRP sub-platform types. These are arbitrary */
1da177e4 LT	32	#define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */
	33	#define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */
	34	#define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */
26c5032e	35	#define _CHRP_briq 0x07 /* TotalImpact's briQ */
1da177e4	36
e8222502 BH	37	#if defined(__KERNEL__) && defined(CONFIG_PPC32)
	38
	39	extern int _chrp_type;
799d6046	40
0a26b136	41	#ifdef CONFIG_PPC_PREP
799d6046	42
1da177e4 LT	43	/* what kind of prep workstation we are */
1da177e4 LT	44	extern int _prep_type;
1da177e4	45
0a26b136 PM	46	#endif /* CONFIG_PPC_PREP */
0a26b136 PM	47
e8222502 BH	48	#endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
e8222502 BH	49
9f04b9e3 PM	50	/*
	51	* Default implementation of macro that returns current
	52	* instruction pointer ("program counter").
	53	*/
	54	#define current_text_addr() ({ __label__ _l; _l: &&_l;})
	55
	56	/* Macros for adjusting thread priority (hardware multi-threading) */
	57	#define HMT_very_low() asm volatile("or 31,31,31 # very low priority")
	58	#define HMT_low() asm volatile("or 1,1,1 # low priority")
	59	#define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority")
	60	#define HMT_medium() asm volatile("or 2,2,2 # medium priority")
	61	#define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority")
	62	#define HMT_high() asm volatile("or 3,3,3 # high priority")
	63
	64	#ifdef __KERNEL__
	65
	66	extern int have_of;
1da177e4 LT	67
1da177e4 LT	68	struct task_struct;
9f04b9e3	69	void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
1da177e4 LT	70	void release_thread(struct task_struct *);
	71
	72	/* Prepare to copy thread state - unlazy all lazy status */
	73	extern void prepare_to_copy(struct task_struct *tsk);
	74
9f04b9e3	75	/* Create a new kernel thread. */
1da177e4 LT	76	extern long kernel_thread(int (fn)(void ), void *arg, unsigned long flags);
	77
	78	/* Lazy FPU handling on uni-processor */
	79	extern struct task_struct *last_task_used_math;
	80	extern struct task_struct *last_task_used_altivec;
	81	extern struct task_struct *last_task_used_spe;
	82
9f04b9e3 PM	83	#ifdef CONFIG_PPC32
	84	#define TASK_SIZE (CONFIG_TASK_SIZE)
	85
1da177e4 LT	86	/* This decides where the kernel will search for a free chunk of vm
	87	* space during mmap's.
	88	*/
	89	#define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
9f04b9e3 PM	90	#endif
	91
	92	#ifdef CONFIG_PPC64
	93	/* 64-bit user address space is 44-bits (16TB user VM) */
	94	#define TASK_SIZE_USER64 (0x0000100000000000UL)
	95
	96	/*
	97	* 32-bit user address space is 4GB - 1 page
	98	* (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
	99	*/
	100	#define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
	101
82455257	102	#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
9f04b9e3	103	TASK_SIZE_USER32 : TASK_SIZE_USER64)
82455257	104	#define TASK_SIZE TASK_SIZE_OF(current)
9f04b9e3 PM	105
	106	/* This decides where the kernel will search for a free chunk of vm
	107	* space during mmap's.
	108	*/
	109	#define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
	110	#define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
	111
	112	#define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
	113	TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
	114	#endif
1da177e4	115
922a70d3 DH	116	#ifdef __KERNEL__
	117	#ifdef __powerpc64__
	118
	119	#define STACK_TOP_USER64 TASK_SIZE_USER64
	120	#define STACK_TOP_USER32 TASK_SIZE_USER32
	121
	122	#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
	123	STACK_TOP_USER32 : STACK_TOP_USER64)
	124
	125	#define STACK_TOP_MAX STACK_TOP_USER64
	126
	127	#else /* __powerpc64__ */
	128
	129	#define STACK_TOP TASK_SIZE
	130	#define STACK_TOP_MAX STACK_TOP
	131
	132	#endif /* __powerpc64__ */
	133	#endif /* __KERNEL__ */
	134
1da177e4 LT	135	typedef struct {
	136	unsigned long seg;
	137	} mm_segment_t;
	138
	139	struct thread_struct {
	140	unsigned long ksp; /* Kernel stack pointer */
85218827 KG	141	unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
85218827 KG	142
9f04b9e3 PM	143	#ifdef CONFIG_PPC64
	144	unsigned long ksp_vsid;
	145	#endif
1da177e4 LT	146	struct pt_regs regs; / Pointer to saved register state */
1da177e4 LT	147	mm_segment_t fs; /* for get_fs() validation */
9f04b9e3	148	#ifdef CONFIG_PPC32
1da177e4	149	void pgdir; / root of page-table tree */
9f04b9e3	150	#endif
1da177e4 LT	151	#if defined(CONFIG_4xx) \|\| defined (CONFIG_BOOKE)
	152	unsigned long dbcr0; /* debug control register values */
	153	unsigned long dbcr1;
	154	#endif
	155	double fpr[32]; /* Complete floating point set */
25c8a78b DG	156	struct { /* fpr ... fpscr must be contiguous */
	157
	158	unsigned int pad;
	159	unsigned int val; /* Floating point status */
	160	} fpscr;
9f04b9e3	161	int fpexc_mode; /* floating-point exception mode */
e9370ae1	162	unsigned int align_ctl; /* alignment handling control */
9f04b9e3 PM	163	#ifdef CONFIG_PPC64
	164	unsigned long start_tb; /* Start purr when proc switched in */
	165	unsigned long accum_tb; /* Total accumilated purr for process */
9f04b9e3 PM	166	#endif
9f04b9e3 PM	167	unsigned long dabr; /* Data address breakpoint register */
1da177e4 LT	168	#ifdef CONFIG_ALTIVEC
1da177e4 LT	169	/* Complete AltiVec register set */
fc624eae	170	vector128 vr[32] __attribute__((aligned(16)));
1da177e4	171	/* AltiVec status */
fc624eae	172	vector128 vscr __attribute__((aligned(16)));
1da177e4 LT	173	unsigned long vrsave;
	174	int used_vr; /* set if process has used altivec */
	175	#endif /* CONFIG_ALTIVEC */
	176	#ifdef CONFIG_SPE
	177	unsigned long evr[32]; /* upper 32-bits of SPE regs */
	178	u64 acc; /* Accumulator */
	179	unsigned long spefscr; /* SPE & eFP status */
	180	int used_spe; /* set if process has used spe */
	181	#endif /* CONFIG_SPE */
	182	};
	183
	184	#define ARCH_MIN_TASKALIGN 16
	185
	186	#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
85218827 KG	187	#define INIT_SP_LIMIT \
85218827 KG	188	(_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
1da177e4	189
9f04b9e3 PM	190
9f04b9e3 PM	191	#ifdef CONFIG_PPC32
1da177e4 LT	192	#define INIT_THREAD { \
1da177e4 LT	193	.ksp = INIT_SP, \
85218827	194	.ksp_limit = INIT_SP_LIMIT, \
1da177e4 LT	195	.fs = KERNEL_DS, \
	196	.pgdir = swapper_pg_dir, \
	197	.fpexc_mode = MSR_FE0 \| MSR_FE1, \
	198	}
9f04b9e3 PM	199	#else
	200	#define INIT_THREAD { \
	201	.ksp = INIT_SP, \
85218827	202	.ksp_limit = INIT_SP_LIMIT, \
9f04b9e3 PM	203	.regs = (struct pt_regs )INIT_SP - 1, / XXX bogus, I think */ \
	204	.fs = KERNEL_DS, \
	205	.fpr = {0}, \
25c8a78b	206	.fpscr = { .val = 0, }, \
ddf5f75a	207	.fpexc_mode = 0, \
9f04b9e3 PM	208	}
9f04b9e3 PM	209	#endif
1da177e4 LT	210
	211	/*
	212	* Return saved PC of a blocked thread. For now, this is the "user" PC
	213	*/
9f04b9e3 PM	214	#define thread_saved_pc(tsk) \
9f04b9e3 PM	215	((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
1da177e4 LT	216
	217	unsigned long get_wchan(struct task_struct *p);
	218
9f04b9e3 PM	219	#define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
9f04b9e3 PM	220	#define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
1da177e4 LT	221
1da177e4 LT	222	/* Get/set floating-point exception mode */
9f04b9e3 PM	223	#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
9f04b9e3 PM	224	#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
1da177e4 LT	225
	226	extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
	227	extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
	228
fab5db97 PM	229	#define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
	230	#define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
	231
	232	extern int get_endian(struct task_struct *tsk, unsigned long adr);
	233	extern int set_endian(struct task_struct *tsk, unsigned int val);
	234
e9370ae1 PM	235	#define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
	236	#define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
	237
	238	extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
	239	extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
	240
9f04b9e3	241	static inline unsigned int __unpack_fe01(unsigned long msr_bits)
1da177e4 LT	242	{
	243	return ((msr_bits & MSR_FE0) >> 10) \| ((msr_bits & MSR_FE1) >> 8);
	244	}
	245
9f04b9e3	246	static inline unsigned long __pack_fe01(unsigned int fpmode)
1da177e4 LT	247	{
	248	return ((fpmode << 10) & MSR_FE0) \| ((fpmode << 8) & MSR_FE1);
	249	}
	250
9f04b9e3 PM	251	#ifdef CONFIG_PPC64
	252	#define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
	253	#else
1da177e4	254	#define cpu_relax() barrier()
9f04b9e3	255	#endif
1da177e4	256
2f25194d AB	257	/* Check that a certain kernel stack pointer is valid in task_struct p */
	258	int validate_sp(unsigned long sp, struct task_struct *p,
	259	unsigned long nbytes);
	260
1da177e4 LT	261	/*
	262	* Prefetch macros.
	263	*/
	264	#define ARCH_HAS_PREFETCH
	265	#define ARCH_HAS_PREFETCHW
	266	#define ARCH_HAS_SPINLOCK_PREFETCH
	267
9f04b9e3	268	static inline void prefetch(const void *x)
1da177e4	269	{
9f04b9e3 PM	270	if (unlikely(!x))
	271	return;
	272
	273	__asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
1da177e4 LT	274	}
1da177e4 LT	275
9f04b9e3	276	static inline void prefetchw(const void *x)
1da177e4	277	{
9f04b9e3 PM	278	if (unlikely(!x))
	279	return;
	280
	281	__asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
1da177e4 LT	282	}
	283
	284	#define spin_lock_prefetch(x) prefetchw(x)
	285
9f04b9e3 PM	286	#ifdef CONFIG_PPC64
	287	#define HAVE_ARCH_PICK_MMAP_LAYOUT
	288	#endif
1da177e4	289
1da177e4	290	#endif /* __KERNEL__ */
9f04b9e3 PM	291	#endif /* __ASSEMBLY__ */
9f04b9e3 PM	292	#endif /* _ASM_POWERPC_PROCESSOR_H */