arch/powerpc/include/asm/processor.h - kernel/msm-4.19 - Gitiles

 #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

 /*
  * 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)

 #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)
 #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_nap(int check_irq);
 extern unsigned long power7_sleep(void);
 extern unsigned long power7_winkle(void);
 extern unsigned long power9_idle_stop(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 */
	#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

	/*
	* 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)

	#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)
	#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_nap(int check_irq);
	extern unsigned long power7_sleep(void);
	extern unsigned long power7_winkle(void);
	extern unsigned long power9_idle_stop(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 */