[mirror_ubuntu-artful-kernel.git] / arch / powerpc / include / asm / 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>

#ifdef CONFIG_VSX
#define TS_FPRWIDTH 2

#ifdef __BIG_ENDIAN__
#define TS_FPROFFSET 0
#define TS_VSRLOWOFFSET 1
#else
#define TS_FPROFFSET 1
#define TS_VSRLOWOFFSET 0
#endif

#else
#define TS_FPRWIDTH 1
#define TS_FPROFFSET 0
#endif

#ifdef CONFIG_PPC64
/* Default SMT priority is set to 3. Use 11- 13bits to save priority. */
#define PPR_PRIORITY 3
#ifdef __ASSEMBLY__
#define INIT_PPR (PPR_PRIORITY << 50)
#else
#define INIT_PPR ((u64)PPR_PRIORITY << 50)
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_PPC64 */

#ifndef __ASSEMBLY__
#include <linux/compiler.h>
#include <linux/cache.h>
#include <asm/ptrace.h>
#include <asm/types.h>
#include <asm/hw_breakpoint.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. Unused */
#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;

#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__

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

#ifdef CONFIG_PPC32

#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
#error User TASK_SIZE overlaps with KERNEL_START address
#endif
#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 can have multiple limits
 * For now supported values are:
 */
#define TASK_SIZE_64TB  (0x0000400000000000UL)
#define TASK_SIZE_128TB (0x0000800000000000UL)
#define TASK_SIZE_512TB (0x0002000000000000UL)

/*
 * For now 512TB is only supported with book3s and 64K linux page size.
 */
#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_64K_PAGES)
/*
 * Max value currently used:
 */
#define TASK_SIZE_USER64		TASK_SIZE_512TB
#define DEFAULT_MAP_WINDOW_USER64	TASK_SIZE_128TB
#else
#define TASK_SIZE_USER64		TASK_SIZE_64TB
#define DEFAULT_MAP_WINDOW_USER64	TASK_SIZE_64TB
#endif

/*
 * 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(DEFAULT_MAP_WINDOW_USER64 / 4))

#define TASK_UNMAPPED_BASE ((is_32bit_task()) ? \
		TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
#endif

/*
 * Initial task size value for user applications. For book3s 64 we start
 * with 128TB and conditionally enable upto 512TB
 */
#ifdef CONFIG_PPC_BOOK3S_64
#define DEFAULT_MAP_WINDOW	((is_32bit_task()) ?			\
				 TASK_SIZE_USER32 : DEFAULT_MAP_WINDOW_USER64)
#else
#define DEFAULT_MAP_WINDOW	TASK_SIZE
#endif

#ifdef __powerpc64__

#define STACK_TOP_USER64 DEFAULT_MAP_WINDOW_USER64
#define STACK_TOP_USER32 TASK_SIZE_USER32

#define STACK_TOP (is_32bit_task() ? \
		   STACK_TOP_USER32 : STACK_TOP_USER64)

#define STACK_TOP_MAX TASK_SIZE_USER64

#else /* __powerpc64__ */

#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX	STACK_TOP

#endif /* __powerpc64__ */

typedef struct {
	unsigned long seg;
} mm_segment_t;

#define TS_FPR(i) fp_state.fpr[i][TS_FPROFFSET]
#define TS_CKFPR(i) ckfp_state.fpr[i][TS_FPROFFSET]

/* FP and VSX 0-31 register set */
struct thread_fp_state {
	u64	fpr[32][TS_FPRWIDTH] __attribute__((aligned(16)));
	u64	fpscr;		/* Floating point status */
};

/* Complete AltiVec register set including VSCR */
struct thread_vr_state {
	vector128	vr[32] __attribute__((aligned(16)));
	vector128	vscr __attribute__((aligned(16)));
};

struct debug_reg {
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
	/*
	 * The following help to manage the use of Debug Control Registers
	 * om the BookE platforms.
	 */
	uint32_t	dbcr0;
	uint32_t	dbcr1;
#ifdef CONFIG_BOOKE
	uint32_t	dbcr2;
#endif
	/*
	 * The stored value of the DBSR register will be the value at the
	 * last debug interrupt. This register can only be read from the
	 * user (will never be written to) and has value while helping to
	 * describe the reason for the last debug trap.  Torez
	 */
	uint32_t	dbsr;
	/*
	 * The following will contain addresses used by debug applications
	 * to help trace and trap on particular address locations.
	 * The bits in the Debug Control Registers above help define which
	 * of the following registers will contain valid data and/or addresses.
	 */
	unsigned long	iac1;
	unsigned long	iac2;
#if CONFIG_PPC_ADV_DEBUG_IACS > 2
	unsigned long	iac3;
	unsigned long	iac4;
#endif
	unsigned long	dac1;
	unsigned long	dac2;
#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
	unsigned long	dvc1;
	unsigned long	dvc2;
#endif
#endif
};

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_BOOKE
	/* BookE base exception scratch space; align on cacheline */
	unsigned long	normsave[8] ____cacheline_aligned;
#endif
#ifdef CONFIG_PPC32
	void		*pgdir;		/* root of page-table tree */
	unsigned long	ksp_limit;	/* if ksp <= ksp_limit stack overflow */
#endif
	/* Debug Registers */
	struct debug_reg debug;
	struct thread_fp_state	fp_state;
	struct thread_fp_state	*fp_save_area;
	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 accumulated purr for process */
#endif
#ifdef CONFIG_HAVE_HW_BREAKPOINT
	struct perf_event *ptrace_bps[HBP_NUM];
	/*
	 * Helps identify source of single-step exception and subsequent
	 * hw-breakpoint enablement
	 */
	struct perf_event *last_hit_ubp;
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
	struct arch_hw_breakpoint hw_brk; /* info on the hardware breakpoint */
	unsigned long	trap_nr;	/* last trap # on this thread */
	u8 load_fp;
#ifdef CONFIG_ALTIVEC
	u8 load_vec;
	struct thread_vr_state vr_state;
	struct thread_vr_state *vr_save_area;
	unsigned long	vrsave;
	int		used_vr;	/* set if process has used altivec */
#endif /* CONFIG_ALTIVEC */
#ifdef CONFIG_VSX
	/* VSR status */
	int		used_vsr;	/* set if process has used VSX */
#endif /* CONFIG_VSX */
#ifdef CONFIG_SPE
	unsigned long	evr[32];	/* upper 32-bits of SPE regs */
	u64		acc;		/* Accumulator */
	unsigned long	spefscr;	/* SPE & eFP status */
	unsigned long	spefscr_last;	/* SPEFSCR value on last prctl
					   call or trap return */
	int		used_spe;	/* set if process has used spe */
#endif /* CONFIG_SPE */
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
	u8	load_tm;
	u64		tm_tfhar;	/* Transaction fail handler addr */
	u64		tm_texasr;	/* Transaction exception & summary */
	u64		tm_tfiar;	/* Transaction fail instr address reg */
	struct pt_regs	ckpt_regs;	/* Checkpointed registers */

	unsigned long	tm_tar;
	unsigned long	tm_ppr;
	unsigned long	tm_dscr;

	/*
	 * Checkpointed FP and VSX 0-31 register set.
	 *
	 * When a transaction is active/signalled/scheduled etc., *regs is the
	 * most recent set of/speculated GPRs with ckpt_regs being the older
	 * checkpointed regs to which we roll back if transaction aborts.
	 *
	 * These are analogous to how ckpt_regs and pt_regs work
	 */
	struct thread_fp_state ckfp_state; /* Checkpointed FP state */
	struct thread_vr_state ckvr_state; /* Checkpointed VR state */
	unsigned long	ckvrsave; /* Checkpointed VRSAVE */
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
	void*		kvm_shadow_vcpu; /* KVM internal data */
#endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
#if defined(CONFIG_KVM) && defined(CONFIG_BOOKE)
	struct kvm_vcpu	*kvm_vcpu;
#endif
#ifdef CONFIG_PPC64
	unsigned long	dscr;
	unsigned long	fscr;
	/*
	 * This member element dscr_inherit indicates that the process
	 * has explicitly attempted and changed the DSCR register value
	 * for itself. Hence kernel wont use the default CPU DSCR value
	 * contained in the PACA structure anymore during process context
	 * switch. Once this variable is set, this behaviour will also be
	 * inherited to all the children of this process from that point
	 * onwards.
	 */
	int		dscr_inherit;
	unsigned long	ppr;	/* used to save/restore SMT priority */
#endif
#ifdef CONFIG_PPC_BOOK3S_64
	unsigned long	tar;
	unsigned long	ebbrr;
	unsigned long	ebbhr;
	unsigned long	bescr;
	unsigned long	siar;
	unsigned long	sdar;
	unsigned long	sier;
	unsigned long	mmcr2;
	unsigned 	mmcr0;
	unsigned 	used_ebb;
#endif
};

#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_SPE
#define SPEFSCR_INIT \
	.spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, \
	.spefscr_last = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
#else
#define SPEFSCR_INIT
#endif

#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, \
	SPEFSCR_INIT \
}
#else
#define INIT_THREAD  { \
	.ksp = INIT_SP, \
	.regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
	.fs = KERNEL_DS, \
	.fpexc_mode = 0, \
	.ppr = INIT_PPR, \
	.fscr = FSCR_TAR | FSCR_EBB \
}
#endif

#define task_pt_regs(tsk)	((struct pt_regs *)(tsk)->thread.regs)

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);

extern void load_fp_state(struct thread_fp_state *fp);
extern void store_fp_state(struct thread_fp_state *fp);
extern void load_vr_state(struct thread_vr_state *vr);
extern void store_vr_state(struct thread_vr_state *vr);

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)

#define spin_begin()	HMT_low()

#define spin_cpu_relax()	barrier()

#define spin_cpu_yield()	spin_cpu_relax()

#define spin_end()	HMT_medium()

#define spin_until_cond(cond)					\
do {								\
	if (unlikely(!(cond))) {				\
		spin_begin();					\
		do {						\
			spin_cpu_relax();			\
		} while (!(cond));				\
		spin_end();					\
	}							\
} 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)

#define HAVE_ARCH_PICK_MMAP_LAYOUT

#ifdef CONFIG_PPC64
static inline unsigned long get_clean_sp(unsigned long sp, int is_32)
{
	if (is_32)
		return sp & 0x0ffffffffUL;
	return sp;
}
#else
static inline unsigned long get_clean_sp(unsigned long sp, int is_32)
{
	return sp;
}
#endif

extern unsigned long cpuidle_disable;
enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};

extern int powersave_nap;	/* set if nap mode can be used in idle loop */
extern unsigned long power7_idle_insn(unsigned long type); /* PNV_THREAD_NAP/etc*/
extern void power7_idle_type(unsigned long type);
extern unsigned long power9_idle_stop(unsigned long psscr_val);
extern void power9_idle_type(unsigned long stop_psscr_val,
			      unsigned long stop_psscr_mask);

extern void flush_instruction_cache(void);
extern void hard_reset_now(void);
extern void poweroff_now(void);
extern int fix_alignment(struct pt_regs *);
extern void cvt_fd(float *from, double *to);
extern void cvt_df(double *from, float *to);
extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);

#ifdef CONFIG_PPC64
/*
 * We handle most unaligned accesses in hardware. On the other hand 
 * unaligned DMA can be very expensive on some ppc64 IO chips (it does
 * powers of 2 writes until it reaches sufficient alignment).
 *
 * Based on this we disable the IP header alignment in network drivers.
 */
#define NET_IP_ALIGN	0
#endif

#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_PROCESSOR_H */
Commit	Line	Data
	1	#ifndef _ASM_POWERPC_PROCESSOR_H
	2	#define _ASM_POWERPC_PROCESSOR_H
	3
	4	/*
	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.
	11	*/
	12
	13	#include <asm/reg.h>
	14
	15	#ifdef CONFIG_VSX
	16	#define TS_FPRWIDTH 2
	17
	18	#ifdef __BIG_ENDIAN__
	19	#define TS_FPROFFSET 0
	20	#define TS_VSRLOWOFFSET 1
	21	#else
	22	#define TS_FPROFFSET 1
	23	#define TS_VSRLOWOFFSET 0
	24	#endif
	25
	26	#else
	27	#define TS_FPRWIDTH 1
	28	#define TS_FPROFFSET 0
	29	#endif
	30
	31	#ifdef CONFIG_PPC64
	32	/* Default SMT priority is set to 3. Use 11- 13bits to save priority. */
	33	#define PPR_PRIORITY 3
	34	#ifdef __ASSEMBLY__
	35	#define INIT_PPR (PPR_PRIORITY << 50)
	36	#else
	37	#define INIT_PPR ((u64)PPR_PRIORITY << 50)
	38	#endif /* __ASSEMBLY__ */
	39	#endif /* CONFIG_PPC64 */
	40
	41	#ifndef __ASSEMBLY__
	42	#include <linux/compiler.h>
	43	#include <linux/cache.h>
	44	#include <asm/ptrace.h>
	45	#include <asm/types.h>
	46	#include <asm/hw_breakpoint.h>
	47
	48	/* We do _not_ want to define new machine types at all, those must die
	49	* in favor of using the device-tree
	50	* -- BenH.
	51	*/
	52
	53	/* PREP sub-platform types. Unused */
	54	#define _PREP_Motorola 0x01 /* motorola prep */
	55	#define _PREP_Firm 0x02 /* firmworks prep */
	56	#define _PREP_IBM 0x00 /* ibm prep */
	57	#define _PREP_Bull 0x03 /* bull prep */
	58
	59	/* CHRP sub-platform types. These are arbitrary */
	60	#define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */
	61	#define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */
	62	#define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */
	63	#define _CHRP_briq 0x07 /* TotalImpact's briQ */
	64
	65	#if defined(__KERNEL__) && defined(CONFIG_PPC32)
	66
	67	extern int _chrp_type;
	68
	69	#endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
	70
	71	/*
	72	* Default implementation of macro that returns current
	73	* instruction pointer ("program counter").
	74	*/
	75	#define current_text_addr() ({ __label__ _l; _l: &&_l;})
	76
	77	/* Macros for adjusting thread priority (hardware multi-threading) */
	78	#define HMT_very_low() asm volatile("or 31,31,31 # very low priority")
	79	#define HMT_low() asm volatile("or 1,1,1 # low priority")
	80	#define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority")
	81	#define HMT_medium() asm volatile("or 2,2,2 # medium priority")
	82	#define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority")
	83	#define HMT_high() asm volatile("or 3,3,3 # high priority")
	84
	85	#ifdef __KERNEL__
	86
	87	struct task_struct;
	88	void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
	89	void release_thread(struct task_struct *);
	90
	91	#ifdef CONFIG_PPC32
	92
	93	#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
	94	#error User TASK_SIZE overlaps with KERNEL_START address
	95	#endif
	96	#define TASK_SIZE (CONFIG_TASK_SIZE)
	97
	98	/* This decides where the kernel will search for a free chunk of vm
	99	* space during mmap's.
	100	*/
	101	#define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
	102	#endif
	103
	104	#ifdef CONFIG_PPC64
	105	/*
	106	* 64-bit user address space can have multiple limits
	107	* For now supported values are:
	108	*/
	109	#define TASK_SIZE_64TB (0x0000400000000000UL)
	110	#define TASK_SIZE_128TB (0x0000800000000000UL)
	111	#define TASK_SIZE_512TB (0x0002000000000000UL)
	112
	113	/*
	114	* For now 512TB is only supported with book3s and 64K linux page size.
	115	*/
	116	#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_64K_PAGES)
	117	/*
	118	* Max value currently used:
	119	*/
	120	#define TASK_SIZE_USER64 TASK_SIZE_512TB
	121	#define DEFAULT_MAP_WINDOW_USER64 TASK_SIZE_128TB
	122	#else
	123	#define TASK_SIZE_USER64 TASK_SIZE_64TB
	124	#define DEFAULT_MAP_WINDOW_USER64 TASK_SIZE_64TB
	125	#endif
	126
	127	/*
	128	* 32-bit user address space is 4GB - 1 page
	129	* (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
	130	*/
	131	#define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
	132
	133	#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
	134	TASK_SIZE_USER32 : TASK_SIZE_USER64)
	135	#define TASK_SIZE TASK_SIZE_OF(current)
	136	/* This decides where the kernel will search for a free chunk of vm
	137	* space during mmap's.
	138	*/
	139	#define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
	140	#define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(DEFAULT_MAP_WINDOW_USER64 / 4))
	141
	142	#define TASK_UNMAPPED_BASE ((is_32bit_task()) ? \
	143	TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
	144	#endif
	145
	146	/*
	147	* Initial task size value for user applications. For book3s 64 we start
	148	* with 128TB and conditionally enable upto 512TB
	149	*/
	150	#ifdef CONFIG_PPC_BOOK3S_64
	151	#define DEFAULT_MAP_WINDOW ((is_32bit_task()) ? \
	152	TASK_SIZE_USER32 : DEFAULT_MAP_WINDOW_USER64)
	153	#else
	154	#define DEFAULT_MAP_WINDOW TASK_SIZE
	155	#endif
	156
	157	#ifdef __powerpc64__
	158
	159	#define STACK_TOP_USER64 DEFAULT_MAP_WINDOW_USER64
	160	#define STACK_TOP_USER32 TASK_SIZE_USER32
	161
	162	#define STACK_TOP (is_32bit_task() ? \
	163	STACK_TOP_USER32 : STACK_TOP_USER64)
	164
	165	#define STACK_TOP_MAX TASK_SIZE_USER64
	166
	167	#else /* __powerpc64__ */
	168
	169	#define STACK_TOP TASK_SIZE
	170	#define STACK_TOP_MAX STACK_TOP
	171
	172	#endif /* __powerpc64__ */
	173
	174	typedef struct {
	175	unsigned long seg;
	176	} mm_segment_t;
	177
	178	#define TS_FPR(i) fp_state.fpr[i][TS_FPROFFSET]
	179	#define TS_CKFPR(i) ckfp_state.fpr[i][TS_FPROFFSET]
	180
	181	/* FP and VSX 0-31 register set */
	182	struct thread_fp_state {
	183	u64 fpr[32][TS_FPRWIDTH] __attribute__((aligned(16)));
	184	u64 fpscr; /* Floating point status */
	185	};
	186
	187	/* Complete AltiVec register set including VSCR */
	188	struct thread_vr_state {
	189	vector128 vr[32] __attribute__((aligned(16)));
	190	vector128 vscr __attribute__((aligned(16)));
	191	};
	192
	193	struct debug_reg {
	194	#ifdef CONFIG_PPC_ADV_DEBUG_REGS
	195	/*
	196	* The following help to manage the use of Debug Control Registers
	197	* om the BookE platforms.
	198	*/
	199	uint32_t dbcr0;
	200	uint32_t dbcr1;
	201	#ifdef CONFIG_BOOKE
	202	uint32_t dbcr2;
	203	#endif
	204	/*
	205	* The stored value of the DBSR register will be the value at the
	206	* last debug interrupt. This register can only be read from the
	207	* user (will never be written to) and has value while helping to
	208	* describe the reason for the last debug trap. Torez
	209	*/
	210	uint32_t dbsr;
	211	/*
	212	* The following will contain addresses used by debug applications
	213	* to help trace and trap on particular address locations.
	214	* The bits in the Debug Control Registers above help define which
	215	* of the following registers will contain valid data and/or addresses.
	216	*/
	217	unsigned long iac1;
	218	unsigned long iac2;
	219	#if CONFIG_PPC_ADV_DEBUG_IACS > 2
	220	unsigned long iac3;
	221	unsigned long iac4;
	222	#endif
	223	unsigned long dac1;
	224	unsigned long dac2;
	225	#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
	226	unsigned long dvc1;
	227	unsigned long dvc2;
	228	#endif
	229	#endif
	230	};
	231
	232	struct thread_struct {
	233	unsigned long ksp; /* Kernel stack pointer */
	234
	235	#ifdef CONFIG_PPC64
	236	unsigned long ksp_vsid;
	237	#endif
	238	struct pt_regs regs; / Pointer to saved register state */
	239	mm_segment_t fs; /* for get_fs() validation */
	240	#ifdef CONFIG_BOOKE
	241	/* BookE base exception scratch space; align on cacheline */
	242	unsigned long normsave[8] ____cacheline_aligned;
	243	#endif
	244	#ifdef CONFIG_PPC32
	245	void pgdir; / root of page-table tree */
	246	unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
	247	#endif
	248	/* Debug Registers */
	249	struct debug_reg debug;
	250	struct thread_fp_state fp_state;
	251	struct thread_fp_state *fp_save_area;
	252	int fpexc_mode; /* floating-point exception mode */
	253	unsigned int align_ctl; /* alignment handling control */
	254	#ifdef CONFIG_PPC64
	255	unsigned long start_tb; /* Start purr when proc switched in */
	256	unsigned long accum_tb; /* Total accumulated purr for process */
	257	#endif
	258	#ifdef CONFIG_HAVE_HW_BREAKPOINT
	259	struct perf_event *ptrace_bps[HBP_NUM];
	260	/*
	261	* Helps identify source of single-step exception and subsequent
	262	* hw-breakpoint enablement
	263	*/
	264	struct perf_event *last_hit_ubp;
	265	#endif /* CONFIG_HAVE_HW_BREAKPOINT */
	266	struct arch_hw_breakpoint hw_brk; /* info on the hardware breakpoint */
	267	unsigned long trap_nr; /* last trap # on this thread */
	268	u8 load_fp;
	269	#ifdef CONFIG_ALTIVEC
	270	u8 load_vec;
	271	struct thread_vr_state vr_state;
	272	struct thread_vr_state *vr_save_area;
	273	unsigned long vrsave;
	274	int used_vr; /* set if process has used altivec */
	275	#endif /* CONFIG_ALTIVEC */
	276	#ifdef CONFIG_VSX
	277	/* VSR status */
	278	int used_vsr; /* set if process has used VSX */
	279	#endif /* CONFIG_VSX */
	280	#ifdef CONFIG_SPE
	281	unsigned long evr[32]; /* upper 32-bits of SPE regs */
	282	u64 acc; /* Accumulator */
	283	unsigned long spefscr; /* SPE & eFP status */
	284	unsigned long spefscr_last; /* SPEFSCR value on last prctl
	285	call or trap return */
	286	int used_spe; /* set if process has used spe */
	287	#endif /* CONFIG_SPE */
	288	#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
	289	u8 load_tm;
	290	u64 tm_tfhar; /* Transaction fail handler addr */
	291	u64 tm_texasr; /* Transaction exception & summary */
	292	u64 tm_tfiar; /* Transaction fail instr address reg */
	293	struct pt_regs ckpt_regs; /* Checkpointed registers */
	294
	295	unsigned long tm_tar;
	296	unsigned long tm_ppr;
	297	unsigned long tm_dscr;
	298
	299	/*
	300	* Checkpointed FP and VSX 0-31 register set.
	301	*
	302	* When a transaction is active/signalled/scheduled etc., *regs is the
	303	* most recent set of/speculated GPRs with ckpt_regs being the older
	304	* checkpointed regs to which we roll back if transaction aborts.
	305	*
	306	* These are analogous to how ckpt_regs and pt_regs work
	307	*/
	308	struct thread_fp_state ckfp_state; /* Checkpointed FP state */
	309	struct thread_vr_state ckvr_state; /* Checkpointed VR state */
	310	unsigned long ckvrsave; /* Checkpointed VRSAVE */
	311	#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
	312	#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
	313	void* kvm_shadow_vcpu; /* KVM internal data */
	314	#endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
	315	#if defined(CONFIG_KVM) && defined(CONFIG_BOOKE)
	316	struct kvm_vcpu *kvm_vcpu;
	317	#endif
	318	#ifdef CONFIG_PPC64
	319	unsigned long dscr;
	320	unsigned long fscr;
	321	/*
	322	* This member element dscr_inherit indicates that the process
	323	* has explicitly attempted and changed the DSCR register value
	324	* for itself. Hence kernel wont use the default CPU DSCR value
	325	* contained in the PACA structure anymore during process context
	326	* switch. Once this variable is set, this behaviour will also be
	327	* inherited to all the children of this process from that point
	328	* onwards.
	329	*/
	330	int dscr_inherit;
	331	unsigned long ppr; /* used to save/restore SMT priority */
	332	#endif
	333	#ifdef CONFIG_PPC_BOOK3S_64
	334	unsigned long tar;
	335	unsigned long ebbrr;
	336	unsigned long ebbhr;
	337	unsigned long bescr;
	338	unsigned long siar;
	339	unsigned long sdar;
	340	unsigned long sier;
	341	unsigned long mmcr2;
	342	unsigned mmcr0;
	343	unsigned used_ebb;
	344	#endif
	345	};
	346
	347	#define ARCH_MIN_TASKALIGN 16
	348
	349	#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
	350	#define INIT_SP_LIMIT \
	351	(_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
	352
	353	#ifdef CONFIG_SPE
	354	#define SPEFSCR_INIT \
	355	.spefscr = SPEFSCR_FINVE \| SPEFSCR_FDBZE \| SPEFSCR_FUNFE \| SPEFSCR_FOVFE, \
	356	.spefscr_last = SPEFSCR_FINVE \| SPEFSCR_FDBZE \| SPEFSCR_FUNFE \| SPEFSCR_FOVFE,
	357	#else
	358	#define SPEFSCR_INIT
	359	#endif
	360
	361	#ifdef CONFIG_PPC32
	362	#define INIT_THREAD { \
	363	.ksp = INIT_SP, \
	364	.ksp_limit = INIT_SP_LIMIT, \
	365	.fs = KERNEL_DS, \
	366	.pgdir = swapper_pg_dir, \
	367	.fpexc_mode = MSR_FE0 \| MSR_FE1, \
	368	SPEFSCR_INIT \
	369	}
	370	#else
	371	#define INIT_THREAD { \
	372	.ksp = INIT_SP, \
	373	.regs = (struct pt_regs )INIT_SP - 1, / XXX bogus, I think */ \
	374	.fs = KERNEL_DS, \
	375	.fpexc_mode = 0, \
	376	.ppr = INIT_PPR, \
	377	.fscr = FSCR_TAR \| FSCR_EBB \
	378	}
	379	#endif
	380
	381	#define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs)
	382
	383	unsigned long get_wchan(struct task_struct *p);
	384
	385	#define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
	386	#define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
	387
	388	/* Get/set floating-point exception mode */
	389	#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
	390	#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
	391
	392	extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
	393	extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
	394
	395	#define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
	396	#define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
	397
	398	extern int get_endian(struct task_struct *tsk, unsigned long adr);
	399	extern int set_endian(struct task_struct *tsk, unsigned int val);
	400
	401	#define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
	402	#define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
	403
	404	extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
	405	extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
	406
	407	extern void load_fp_state(struct thread_fp_state *fp);
	408	extern void store_fp_state(struct thread_fp_state *fp);
	409	extern void load_vr_state(struct thread_vr_state *vr);
	410	extern void store_vr_state(struct thread_vr_state *vr);
	411
	412	static inline unsigned int __unpack_fe01(unsigned long msr_bits)
	413	{
	414	return ((msr_bits & MSR_FE0) >> 10) \| ((msr_bits & MSR_FE1) >> 8);
	415	}
	416
	417	static inline unsigned long __pack_fe01(unsigned int fpmode)
	418	{
	419	return ((fpmode << 10) & MSR_FE0) \| ((fpmode << 8) & MSR_FE1);
	420	}
	421
	422	#ifdef CONFIG_PPC64
	423	#define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
	424
	425	#define spin_begin() HMT_low()
	426
	427	#define spin_cpu_relax() barrier()
	428
	429	#define spin_cpu_yield() spin_cpu_relax()
	430
	431	#define spin_end() HMT_medium()
	432
	433	#define spin_until_cond(cond) \
	434	do { \
	435	if (unlikely(!(cond))) { \
	436	spin_begin(); \
	437	do { \
	438	spin_cpu_relax(); \
	439	} while (!(cond)); \
	440	spin_end(); \
	441	} \
	442	} while (0)
	443
	444	#else
	445	#define cpu_relax() barrier()
	446	#endif
	447
	448	/* Check that a certain kernel stack pointer is valid in task_struct p */
	449	int validate_sp(unsigned long sp, struct task_struct *p,
	450	unsigned long nbytes);
	451
	452	/*
	453	* Prefetch macros.
	454	*/
	455	#define ARCH_HAS_PREFETCH
	456	#define ARCH_HAS_PREFETCHW
	457	#define ARCH_HAS_SPINLOCK_PREFETCH
	458
	459	static inline void prefetch(const void *x)
	460	{
	461	if (unlikely(!x))
	462	return;
	463
	464	__asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
	465	}
	466
	467	static inline void prefetchw(const void *x)
	468	{
	469	if (unlikely(!x))
	470	return;
	471
	472	__asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
	473	}
	474
	475	#define spin_lock_prefetch(x) prefetchw(x)
	476
	477	#define HAVE_ARCH_PICK_MMAP_LAYOUT
	478
	479	#ifdef CONFIG_PPC64
	480	static inline unsigned long get_clean_sp(unsigned long sp, int is_32)
	481	{
	482	if (is_32)
	483	return sp & 0x0ffffffffUL;
	484	return sp;
	485	}
	486	#else
	487	static inline unsigned long get_clean_sp(unsigned long sp, int is_32)
	488	{
	489	return sp;
	490	}
	491	#endif
	492
	493	extern unsigned long cpuidle_disable;
	494	enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};
	495
	496	extern int powersave_nap; /* set if nap mode can be used in idle loop */
	497	extern unsigned long power7_idle_insn(unsigned long type); /* PNV_THREAD_NAP/etc*/
	498	extern void power7_idle_type(unsigned long type);
	499	extern unsigned long power9_idle_stop(unsigned long psscr_val);
	500	extern void power9_idle_type(unsigned long stop_psscr_val,
	501	unsigned long stop_psscr_mask);
	502
	503	extern void flush_instruction_cache(void);
	504	extern void hard_reset_now(void);
	505	extern void poweroff_now(void);
	506	extern int fix_alignment(struct pt_regs *);
	507	extern void cvt_fd(float from, double to);
	508	extern void cvt_df(double from, float to);
	509	extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
	510
	511	#ifdef CONFIG_PPC64
	512	/*
	513	* We handle most unaligned accesses in hardware. On the other hand
	514	* unaligned DMA can be very expensive on some ppc64 IO chips (it does
	515	* powers of 2 writes until it reaches sufficient alignment).
	516	*
	517	* Based on this we disable the IP header alignment in network drivers.
	518	*/
	519	#define NET_IP_ALIGN 0
	520	#endif
	521
	522	#endif /* __KERNEL__ */
	523	#endif /* __ASSEMBLY__ */
	524	#endif /* _ASM_POWERPC_PROCESSOR_H */