[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 (test_thread_flag(TIF_32BIT) ? \
		TASK_SIZE_USER32 : TASK_SIZE_USER64)

/* 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

typedef struct {
	unsigned long seg;
} mm_segment_t;

struct thread_struct {
	unsigned long	ksp;		/* Kernel stack pointer */
#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)


#ifdef CONFIG_PPC32
#define INIT_THREAD { \
	.ksp = INIT_SP, \
	.fs = KERNEL_DS, \
	.pgdir = swapper_pg_dir, \
	.fpexc_mode = MSR_FE0 | MSR_FE1, \
}
#else
#define INIT_THREAD  { \
	.ksp = INIT_SP, \
	.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
	102	#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
	103	TASK_SIZE_USER32 : TASK_SIZE_USER64)
	104
	105	/* This decides where the kernel will search for a free chunk of vm
	106	* space during mmap's.
	107	*/
	108	#define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
	109	#define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
	110
	111	#define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
	112	TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
	113	#endif
1da177e4 LT	114
	115	typedef struct {
	116	unsigned long seg;
	117	} mm_segment_t;
	118
	119	struct thread_struct {
	120	unsigned long ksp; /* Kernel stack pointer */
9f04b9e3 PM	121	#ifdef CONFIG_PPC64
	122	unsigned long ksp_vsid;
	123	#endif
1da177e4 LT	124	struct pt_regs regs; / Pointer to saved register state */
1da177e4 LT	125	mm_segment_t fs; /* for get_fs() validation */
9f04b9e3	126	#ifdef CONFIG_PPC32
1da177e4	127	void pgdir; / root of page-table tree */
9f04b9e3	128	#endif
1da177e4 LT	129	#if defined(CONFIG_4xx) \|\| defined (CONFIG_BOOKE)
	130	unsigned long dbcr0; /* debug control register values */
	131	unsigned long dbcr1;
	132	#endif
	133	double fpr[32]; /* Complete floating point set */
25c8a78b DG	134	struct { /* fpr ... fpscr must be contiguous */
	135
	136	unsigned int pad;
	137	unsigned int val; /* Floating point status */
	138	} fpscr;
9f04b9e3	139	int fpexc_mode; /* floating-point exception mode */
e9370ae1	140	unsigned int align_ctl; /* alignment handling control */
9f04b9e3 PM	141	#ifdef CONFIG_PPC64
	142	unsigned long start_tb; /* Start purr when proc switched in */
	143	unsigned long accum_tb; /* Total accumilated purr for process */
9f04b9e3 PM	144	#endif
9f04b9e3 PM	145	unsigned long dabr; /* Data address breakpoint register */
1da177e4 LT	146	#ifdef CONFIG_ALTIVEC
1da177e4 LT	147	/* Complete AltiVec register set */
fc624eae	148	vector128 vr[32] __attribute__((aligned(16)));
1da177e4	149	/* AltiVec status */
fc624eae	150	vector128 vscr __attribute__((aligned(16)));
1da177e4 LT	151	unsigned long vrsave;
	152	int used_vr; /* set if process has used altivec */
	153	#endif /* CONFIG_ALTIVEC */
	154	#ifdef CONFIG_SPE
	155	unsigned long evr[32]; /* upper 32-bits of SPE regs */
	156	u64 acc; /* Accumulator */
	157	unsigned long spefscr; /* SPE & eFP status */
	158	int used_spe; /* set if process has used spe */
	159	#endif /* CONFIG_SPE */
	160	};
	161
	162	#define ARCH_MIN_TASKALIGN 16
	163
	164	#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
	165
9f04b9e3 PM	166
9f04b9e3 PM	167	#ifdef CONFIG_PPC32
1da177e4 LT	168	#define INIT_THREAD { \
	169	.ksp = INIT_SP, \
	170	.fs = KERNEL_DS, \
	171	.pgdir = swapper_pg_dir, \
	172	.fpexc_mode = MSR_FE0 \| MSR_FE1, \
	173	}
9f04b9e3 PM	174	#else
	175	#define INIT_THREAD { \
	176	.ksp = INIT_SP, \
	177	.regs = (struct pt_regs )INIT_SP - 1, / XXX bogus, I think */ \
	178	.fs = KERNEL_DS, \
	179	.fpr = {0}, \
25c8a78b	180	.fpscr = { .val = 0, }, \
ddf5f75a	181	.fpexc_mode = 0, \
9f04b9e3 PM	182	}
9f04b9e3 PM	183	#endif
1da177e4 LT	184
	185	/*
	186	* Return saved PC of a blocked thread. For now, this is the "user" PC
	187	*/
9f04b9e3 PM	188	#define thread_saved_pc(tsk) \
9f04b9e3 PM	189	((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
1da177e4 LT	190
	191	unsigned long get_wchan(struct task_struct *p);
	192
9f04b9e3 PM	193	#define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
9f04b9e3 PM	194	#define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
1da177e4 LT	195
1da177e4 LT	196	/* Get/set floating-point exception mode */
9f04b9e3 PM	197	#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
9f04b9e3 PM	198	#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
1da177e4 LT	199
	200	extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
	201	extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
	202
fab5db97 PM	203	#define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
	204	#define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
	205
	206	extern int get_endian(struct task_struct *tsk, unsigned long adr);
	207	extern int set_endian(struct task_struct *tsk, unsigned int val);
	208
e9370ae1 PM	209	#define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
	210	#define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
	211
	212	extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
	213	extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
	214
9f04b9e3	215	static inline unsigned int __unpack_fe01(unsigned long msr_bits)
1da177e4 LT	216	{
	217	return ((msr_bits & MSR_FE0) >> 10) \| ((msr_bits & MSR_FE1) >> 8);
	218	}
	219
9f04b9e3	220	static inline unsigned long __pack_fe01(unsigned int fpmode)
1da177e4 LT	221	{
	222	return ((fpmode << 10) & MSR_FE0) \| ((fpmode << 8) & MSR_FE1);
	223	}
	224
9f04b9e3 PM	225	#ifdef CONFIG_PPC64
	226	#define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
	227	#else
1da177e4	228	#define cpu_relax() barrier()
9f04b9e3	229	#endif
1da177e4	230
2f25194d AB	231	/* Check that a certain kernel stack pointer is valid in task_struct p */
	232	int validate_sp(unsigned long sp, struct task_struct *p,
	233	unsigned long nbytes);
	234
1da177e4 LT	235	/*
	236	* Prefetch macros.
	237	*/
	238	#define ARCH_HAS_PREFETCH
	239	#define ARCH_HAS_PREFETCHW
	240	#define ARCH_HAS_SPINLOCK_PREFETCH
	241
9f04b9e3	242	static inline void prefetch(const void *x)
1da177e4	243	{
9f04b9e3 PM	244	if (unlikely(!x))
	245	return;
	246
	247	__asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
1da177e4 LT	248	}
1da177e4 LT	249
9f04b9e3	250	static inline void prefetchw(const void *x)
1da177e4	251	{
9f04b9e3 PM	252	if (unlikely(!x))
	253	return;
	254
	255	__asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
1da177e4 LT	256	}
	257
	258	#define spin_lock_prefetch(x) prefetchw(x)
	259
9f04b9e3 PM	260	#ifdef CONFIG_PPC64
	261	#define HAVE_ARCH_PICK_MMAP_LAYOUT
	262	#endif
1da177e4	263
1da177e4	264	#endif /* __KERNEL__ */
9f04b9e3 PM	265	#endif /* __ASSEMBLY__ */
9f04b9e3 PM	266	#endif /* _ASM_POWERPC_PROCESSOR_H */