arch/tile/include/asm/processor.h - kernel/common - Git at Google

 /*
  * Copyright 2010 Tilera Corporation. All Rights Reserved.
  *
  *   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, version 2.
  *
  *   This program is distributed in the hope that it will be useful, but
  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  *   NON INFRINGEMENT.  See the GNU General Public License for
  *   more details.
  */

 #ifndef _ASM_TILE_PROCESSOR_H
 #define _ASM_TILE_PROCESSOR_H

 #ifndef __ASSEMBLY__

 /*
  * NOTE: we don't include <linux/ptrace.h> or <linux/percpu.h> as one
  * normally would, due to #include dependencies.
  */
 #include <linux/types.h>
 #include <asm/ptrace.h>
 #include <asm/percpu.h>

 #include <arch/chip.h>
 #include <arch/spr_def.h>

 struct task_struct;
 struct thread_struct;

 typedef struct {
 	unsigned long seg;
 } mm_segment_t;

 /*
  * Default implementation of macro that returns current
  * instruction pointer ("program counter").
  */
 void *current_text_addr(void);

 #if CHIP_HAS_TILE_DMA()
 /* Capture the state of a suspended DMA. */
 struct tile_dma_state {
 	int enabled;
 	unsigned long src;
 	unsigned long dest;
 	unsigned long strides;
 	unsigned long chunk_size;
 	unsigned long src_chunk;
 	unsigned long dest_chunk;
 	unsigned long byte;
 	unsigned long status;
 };

 /*
  * A mask of the DMA status register for selecting only the 'running'
  * and 'done' bits.
  */
 #define DMA_STATUS_MASK \
   (SPR_DMA_STATUS__RUNNING_MASK | SPR_DMA_STATUS__DONE_MASK)
 #endif

 /*
  * Track asynchronous TLB events (faults and access violations)
  * that occur while we are in kernel mode from DMA or the SN processor.
  */
 struct async_tlb {
 	short fault_num;         /* original fault number; 0 if none */
 	char is_fault;           /* was it a fault (vs an access violation) */
 	char is_write;           /* for fault: was it caused by a write? */
 	unsigned long address;   /* what address faulted? */
 };

 #ifdef CONFIG_HARDWALL
 struct hardwall_info;
 struct hardwall_task {
 	/* Which hardwall is this task tied to? (or NULL if none) */
 	struct hardwall_info *info;
 	/* Chains this task into the list at info->task_head. */
 	struct list_head list;
 };
 #ifdef __tilepro__
 #define HARDWALL_TYPES 1   /* udn */
 #else
 #define HARDWALL_TYPES 3   /* udn, idn, and ipi */
 #endif
 #endif

 struct thread_struct {
 	/* kernel stack pointer */
 	unsigned long  ksp;
 	/* kernel PC */
 	unsigned long  pc;
 	/* starting user stack pointer (for page migration) */
 	unsigned long  usp0;
 	/* pid of process that created this one */
 	pid_t creator_pid;
 #if CHIP_HAS_TILE_DMA()
 	/* DMA info for suspended threads (byte == 0 means no DMA state) */
 	struct tile_dma_state tile_dma_state;
 #endif
 	/* User EX_CONTEXT registers */
 	unsigned long ex_context[2];
 	/* User SYSTEM_SAVE registers */
 	unsigned long system_save[4];
 	/* User interrupt mask */
 	unsigned long long interrupt_mask;
 	/* User interrupt-control 0 state */
 	unsigned long intctrl_0;
 #if CHIP_HAS_PROC_STATUS_SPR()
 	/* Any other miscellaneous processor state bits */
 	unsigned long proc_status;
 #endif
 #if !CHIP_HAS_FIXED_INTVEC_BASE()
 	/* Interrupt base for PL0 interrupts */
 	unsigned long interrupt_vector_base;
 #endif
 #if CHIP_HAS_TILE_RTF_HWM()
 	/* Tile cache retry fifo high-water mark */
 	unsigned long tile_rtf_hwm;
 #endif
 #if CHIP_HAS_DSTREAM_PF()
 	/* Data stream prefetch control */
 	unsigned long dstream_pf;
 #endif
 #ifdef CONFIG_HARDWALL
 	/* Hardwall information for various resources. */
 	struct hardwall_task hardwall[HARDWALL_TYPES];
 #endif
 #if CHIP_HAS_TILE_DMA()
 	/* Async DMA TLB fault information */
 	struct async_tlb dma_async_tlb;
 #endif
 #if CHIP_HAS_SN_PROC()
 	/* Was static network processor when we were switched out? */
 	int sn_proc_running;
 	/* Async SNI TLB fault information */
 	struct async_tlb sn_async_tlb;
 #endif
 };

 #endif /* !__ASSEMBLY__ */

 /*
  * Start with "sp" this many bytes below the top of the kernel stack.
  * This preserves the invariant that a called function may write to *sp.
  */
 #define STACK_TOP_DELTA 8

 /*
  * When entering the kernel via a fault, start with the top of the
  * pt_regs structure this many bytes below the top of the page.
  * This aligns the pt_regs structure optimally for cache-line access.
  */
 #ifdef __tilegx__
 #define KSTK_PTREGS_GAP  48
 #else
 #define KSTK_PTREGS_GAP  56
 #endif

 #ifndef __ASSEMBLY__

 #ifdef __tilegx__
 #define TASK_SIZE_MAX		(MEM_LOW_END + 1)
 #else
 #define TASK_SIZE_MAX		PAGE_OFFSET
 #endif

 /* TASK_SIZE and related variables are always checked in "current" context. */
 #ifdef CONFIG_COMPAT
 #define COMPAT_TASK_SIZE	(1UL << 31)
 #define TASK_SIZE		((current_thread_info()->status & TS_COMPAT) ?\
 				 COMPAT_TASK_SIZE : TASK_SIZE_MAX)
 #else
 #define TASK_SIZE		TASK_SIZE_MAX
 #endif

 /* We provide a minimal "vdso" a la x86; just the sigreturn code for now. */
 #define VDSO_BASE		(TASK_SIZE - PAGE_SIZE)

 #define STACK_TOP		VDSO_BASE

 /* STACK_TOP_MAX is used temporarily in execve and should not check COMPAT. */
 #define STACK_TOP_MAX		TASK_SIZE_MAX

 /*
  * This decides where the kernel will search for a free chunk of vm
  * space during mmap's, if it is using bottom-up mapping.
  */
 #define TASK_UNMAPPED_BASE	(PAGE_ALIGN(TASK_SIZE / 3))

 #define HAVE_ARCH_PICK_MMAP_LAYOUT

 #define INIT_THREAD {                                                   \
 	.ksp = (unsigned long)init_stack + THREAD_SIZE - STACK_TOP_DELTA, \
 	.interrupt_mask = -1ULL                                         \
 }

 /* Kernel stack top for the task that first boots on this cpu. */
 DECLARE_PER_CPU(unsigned long, boot_sp);

 /* PC to boot from on this cpu. */
 DECLARE_PER_CPU(unsigned long, boot_pc);

 /* Do necessary setup to start up a newly executed thread. */
 static inline void start_thread(struct pt_regs *regs,
 				unsigned long pc, unsigned long usp)
 {
 	regs->pc = pc;
 	regs->sp = usp;
 	single_step_execve();
 }

 /* Free all resources held by a thread. */
 static inline void release_thread(struct task_struct *dead_task)
 {
 	/* Nothing for now */
 }

 extern int do_work_pending(struct pt_regs *regs, u32 flags);


 /*
  * Return saved (kernel) PC of a blocked thread.
  * Only used in a printk() in kernel/sched/core.c, so don't work too hard.
  */
 #define thread_saved_pc(t)   ((t)->thread.pc)

 unsigned long get_wchan(struct task_struct *p);

 /* Return initial ksp value for given task. */
 #define task_ksp0(task) ((unsigned long)(task)->stack + THREAD_SIZE)

 /* Return some info about the user process TASK. */
 #define KSTK_TOP(task)	(task_ksp0(task) - STACK_TOP_DELTA)
 #define task_pt_regs(task) \
   ((struct pt_regs *)(task_ksp0(task) - KSTK_PTREGS_GAP) - 1)
 #define current_pt_regs()                                   \
   ((struct pt_regs *)((stack_pointer | (THREAD_SIZE - 1)) - \
                       (KSTK_PTREGS_GAP - 1)) - 1)
 #define task_sp(task)	(task_pt_regs(task)->sp)
 #define task_pc(task)	(task_pt_regs(task)->pc)
 /* Aliases for pc and sp (used in fs/proc/array.c) */
 #define KSTK_EIP(task)	task_pc(task)
 #define KSTK_ESP(task)	task_sp(task)

 /* Standard format for printing registers and other word-size data. */
 #ifdef __tilegx__
 # define REGFMT "0x%016lx"
 #else
 # define REGFMT "0x%08lx"
 #endif

 /*
  * Do some slow action (e.g. read a slow SPR).
  * Note that this must also have compiler-barrier semantics since
  * it may be used in a busy loop reading memory.
  */
 static inline void cpu_relax(void)
 {
 	__insn_mfspr(SPR_PASS);
 	barrier();
 }

 /* Info on this processor (see fs/proc/cpuinfo.c) */
 struct seq_operations;
 extern const struct seq_operations cpuinfo_op;

 /* Provide information about the chip model. */
 extern char chip_model[64];

 /* Data on which physical memory controller corresponds to which NUMA node. */
 extern int node_controller[];

 #if CHIP_HAS_CBOX_HOME_MAP()
 /* Does the heap allocator return hash-for-home pages by default? */
 extern int hash_default;

 /* Should kernel stack pages be hash-for-home? */
 extern int kstack_hash;

 /* Does MAP_ANONYMOUS return hash-for-home pages by default? */
 #define uheap_hash hash_default

 #else
 #define hash_default 0
 #define kstack_hash 0
 #define uheap_hash 0
 #endif

 /* Are we using huge pages in the TLB for kernel data? */
 extern int kdata_huge;

 /* Support standard Linux prefetching. */
 #define ARCH_HAS_PREFETCH
 #define prefetch(x) __builtin_prefetch(x)
 #define PREFETCH_STRIDE CHIP_L2_LINE_SIZE()

 /* Bring a value into the L1D, faulting the TLB if necessary. */
 #ifdef __tilegx__
 #define prefetch_L1(x) __insn_prefetch_l1_fault((void *)(x))
 #else
 #define prefetch_L1(x) __insn_prefetch_L1((void *)(x))
 #endif

 #else /* __ASSEMBLY__ */

 /* Do some slow action (e.g. read a slow SPR). */
 #define CPU_RELAX       mfspr zero, SPR_PASS

 #endif /* !__ASSEMBLY__ */

 /* Assembly code assumes that the PL is in the low bits. */
 #if SPR_EX_CONTEXT_1_1__PL_SHIFT != 0
 # error Fix assembly assumptions about PL
 #endif

 /* We sometimes use these macros for EX_CONTEXT_0_1 as well. */
 #if SPR_EX_CONTEXT_1_1__PL_SHIFT != SPR_EX_CONTEXT_0_1__PL_SHIFT || \
     SPR_EX_CONTEXT_1_1__PL_RMASK != SPR_EX_CONTEXT_0_1__PL_RMASK || \
     SPR_EX_CONTEXT_1_1__ICS_SHIFT != SPR_EX_CONTEXT_0_1__ICS_SHIFT || \
     SPR_EX_CONTEXT_1_1__ICS_RMASK != SPR_EX_CONTEXT_0_1__ICS_RMASK
 # error Fix assumptions that EX1 macros work for both PL0 and PL1
 #endif

 /* Allow pulling apart and recombining the PL and ICS bits in EX_CONTEXT. */
 #define EX1_PL(ex1) \
   (((ex1) >> SPR_EX_CONTEXT_1_1__PL_SHIFT) & SPR_EX_CONTEXT_1_1__PL_RMASK)
 #define EX1_ICS(ex1) \
   (((ex1) >> SPR_EX_CONTEXT_1_1__ICS_SHIFT) & SPR_EX_CONTEXT_1_1__ICS_RMASK)
 #define PL_ICS_EX1(pl, ics) \
   (((pl) << SPR_EX_CONTEXT_1_1__PL_SHIFT) | \
    ((ics) << SPR_EX_CONTEXT_1_1__ICS_SHIFT))

 /*
  * Provide symbolic constants for PLs.
  * Note that assembly code assumes that USER_PL is zero.
  */
 #define USER_PL 0
 #if CONFIG_KERNEL_PL == 2
 #define GUEST_PL 1
 #endif
 #define KERNEL_PL CONFIG_KERNEL_PL

 /* SYSTEM_SAVE_K_0 holds the current cpu number ORed with ksp0. */
 #define CPU_LOG_MASK_VALUE 12
 #define CPU_MASK_VALUE ((1 << CPU_LOG_MASK_VALUE) - 1)
 #if CONFIG_NR_CPUS > CPU_MASK_VALUE
 # error Too many cpus!
 #endif
 #define raw_smp_processor_id() \
 	((int)__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & CPU_MASK_VALUE)
 #define get_current_ksp0() \
 	(__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & ~CPU_MASK_VALUE)
 #define next_current_ksp0(task) ({ \
 	unsigned long __ksp0 = task_ksp0(task); \
 	int __cpu = raw_smp_processor_id(); \
 	BUG_ON(__ksp0 & CPU_MASK_VALUE); \
 	__ksp0 | __cpu; \
 })

 #endif /* _ASM_TILE_PROCESSOR_H */
	/*
	* Copyright 2010 Tilera Corporation. All Rights Reserved.
	*
	* 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, version 2.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	* NON INFRINGEMENT. See the GNU General Public License for
	* more details.
	*/

	#ifndef _ASM_TILE_PROCESSOR_H
	#define _ASM_TILE_PROCESSOR_H

	#ifndef __ASSEMBLY__

	/*
	* NOTE: we don't include <linux/ptrace.h> or <linux/percpu.h> as one
	* normally would, due to #include dependencies.
	*/
	#include <linux/types.h>
	#include <asm/ptrace.h>
	#include <asm/percpu.h>

	#include <arch/chip.h>
	#include <arch/spr_def.h>

	struct task_struct;
	struct thread_struct;

	typedef struct {
	unsigned long seg;
	} mm_segment_t;

	/*
	* Default implementation of macro that returns current
	* instruction pointer ("program counter").
	*/
	void *current_text_addr(void);

	#if CHIP_HAS_TILE_DMA()
	/* Capture the state of a suspended DMA. */
	struct tile_dma_state {
	int enabled;
	unsigned long src;
	unsigned long dest;
	unsigned long strides;
	unsigned long chunk_size;
	unsigned long src_chunk;
	unsigned long dest_chunk;
	unsigned long byte;
	unsigned long status;
	};

	/*
	* A mask of the DMA status register for selecting only the 'running'
	* and 'done' bits.
	*/
	#define DMA_STATUS_MASK \
	(SPR_DMA_STATUS__RUNNING_MASK \| SPR_DMA_STATUS__DONE_MASK)
	#endif

	/*
	* Track asynchronous TLB events (faults and access violations)
	* that occur while we are in kernel mode from DMA or the SN processor.
	*/
	struct async_tlb {
	short fault_num; /* original fault number; 0 if none */
	char is_fault; /* was it a fault (vs an access violation) */
	char is_write; /* for fault: was it caused by a write? */
	unsigned long address; /* what address faulted? */
	};

	#ifdef CONFIG_HARDWALL
	struct hardwall_info;
	struct hardwall_task {
	/* Which hardwall is this task tied to? (or NULL if none) */
	struct hardwall_info *info;
	/* Chains this task into the list at info->task_head. */
	struct list_head list;
	};
	#ifdef __tilepro__
	#define HARDWALL_TYPES 1 /* udn */
	#else
	#define HARDWALL_TYPES 3 /* udn, idn, and ipi */
	#endif
	#endif

	struct thread_struct {
	/* kernel stack pointer */
	unsigned long ksp;
	/* kernel PC */
	unsigned long pc;
	/* starting user stack pointer (for page migration) */
	unsigned long usp0;
	/* pid of process that created this one */
	pid_t creator_pid;
	#if CHIP_HAS_TILE_DMA()
	/* DMA info for suspended threads (byte == 0 means no DMA state) */
	struct tile_dma_state tile_dma_state;
	#endif
	/* User EX_CONTEXT registers */
	unsigned long ex_context[2];
	/* User SYSTEM_SAVE registers */
	unsigned long system_save[4];
	/* User interrupt mask */
	unsigned long long interrupt_mask;
	/* User interrupt-control 0 state */
	unsigned long intctrl_0;
	#if CHIP_HAS_PROC_STATUS_SPR()
	/* Any other miscellaneous processor state bits */
	unsigned long proc_status;
	#endif
	#if !CHIP_HAS_FIXED_INTVEC_BASE()
	/* Interrupt base for PL0 interrupts */
	unsigned long interrupt_vector_base;
	#endif
	#if CHIP_HAS_TILE_RTF_HWM()
	/* Tile cache retry fifo high-water mark */
	unsigned long tile_rtf_hwm;
	#endif
	#if CHIP_HAS_DSTREAM_PF()
	/* Data stream prefetch control */
	unsigned long dstream_pf;
	#endif
	#ifdef CONFIG_HARDWALL
	/* Hardwall information for various resources. */
	struct hardwall_task hardwall[HARDWALL_TYPES];
	#endif
	#if CHIP_HAS_TILE_DMA()
	/* Async DMA TLB fault information */
	struct async_tlb dma_async_tlb;
	#endif
	#if CHIP_HAS_SN_PROC()
	/* Was static network processor when we were switched out? */
	int sn_proc_running;
	/* Async SNI TLB fault information */
	struct async_tlb sn_async_tlb;
	#endif
	};

	#endif /* !__ASSEMBLY__ */

	/*
	* Start with "sp" this many bytes below the top of the kernel stack.
	* This preserves the invariant that a called function may write to *sp.
	*/
	#define STACK_TOP_DELTA 8

	/*
	* When entering the kernel via a fault, start with the top of the
	* pt_regs structure this many bytes below the top of the page.
	* This aligns the pt_regs structure optimally for cache-line access.
	*/
	#ifdef __tilegx__
	#define KSTK_PTREGS_GAP 48
	#else
	#define KSTK_PTREGS_GAP 56
	#endif

	#ifndef __ASSEMBLY__

	#ifdef __tilegx__
	#define TASK_SIZE_MAX (MEM_LOW_END + 1)
	#else
	#define TASK_SIZE_MAX PAGE_OFFSET
	#endif

	/* TASK_SIZE and related variables are always checked in "current" context. */
	#ifdef CONFIG_COMPAT
	#define COMPAT_TASK_SIZE (1UL << 31)
	#define TASK_SIZE ((current_thread_info()->status & TS_COMPAT) ?\
	COMPAT_TASK_SIZE : TASK_SIZE_MAX)
	#else
	#define TASK_SIZE TASK_SIZE_MAX
	#endif

	/* We provide a minimal "vdso" a la x86; just the sigreturn code for now. */
	#define VDSO_BASE (TASK_SIZE - PAGE_SIZE)

	#define STACK_TOP VDSO_BASE

	/* STACK_TOP_MAX is used temporarily in execve and should not check COMPAT. */
	#define STACK_TOP_MAX TASK_SIZE_MAX

	/*
	* This decides where the kernel will search for a free chunk of vm
	* space during mmap's, if it is using bottom-up mapping.
	*/
	#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))

	#define HAVE_ARCH_PICK_MMAP_LAYOUT

	#define INIT_THREAD { \
	.ksp = (unsigned long)init_stack + THREAD_SIZE - STACK_TOP_DELTA, \
	.interrupt_mask = -1ULL \
	}

	/* Kernel stack top for the task that first boots on this cpu. */
	DECLARE_PER_CPU(unsigned long, boot_sp);

	/* PC to boot from on this cpu. */
	DECLARE_PER_CPU(unsigned long, boot_pc);

	/* Do necessary setup to start up a newly executed thread. */
	static inline void start_thread(struct pt_regs *regs,
	unsigned long pc, unsigned long usp)
	{
	regs->pc = pc;
	regs->sp = usp;
	single_step_execve();
	}

	/* Free all resources held by a thread. */
	static inline void release_thread(struct task_struct *dead_task)
	{
	/* Nothing for now */
	}

	extern int do_work_pending(struct pt_regs *regs, u32 flags);


	/*
	* Return saved (kernel) PC of a blocked thread.
	* Only used in a printk() in kernel/sched/core.c, so don't work too hard.
	*/
	#define thread_saved_pc(t) ((t)->thread.pc)

	unsigned long get_wchan(struct task_struct *p);

	/* Return initial ksp value for given task. */
	#define task_ksp0(task) ((unsigned long)(task)->stack + THREAD_SIZE)

	/* Return some info about the user process TASK. */
	#define KSTK_TOP(task) (task_ksp0(task) - STACK_TOP_DELTA)
	#define task_pt_regs(task) \
	((struct pt_regs *)(task_ksp0(task) - KSTK_PTREGS_GAP) - 1)
	#define current_pt_regs() \
	((struct pt_regs *)((stack_pointer \| (THREAD_SIZE - 1)) - \
	(KSTK_PTREGS_GAP - 1)) - 1)
	#define task_sp(task) (task_pt_regs(task)->sp)
	#define task_pc(task) (task_pt_regs(task)->pc)
	/* Aliases for pc and sp (used in fs/proc/array.c) */
	#define KSTK_EIP(task) task_pc(task)
	#define KSTK_ESP(task) task_sp(task)

	/* Standard format for printing registers and other word-size data. */
	#ifdef __tilegx__
	# define REGFMT "0x%016lx"
	#else
	# define REGFMT "0x%08lx"
	#endif

	/*
	* Do some slow action (e.g. read a slow SPR).
	* Note that this must also have compiler-barrier semantics since
	* it may be used in a busy loop reading memory.
	*/
	static inline void cpu_relax(void)
	{
	__insn_mfspr(SPR_PASS);
	barrier();
	}

	/* Info on this processor (see fs/proc/cpuinfo.c) */
	struct seq_operations;
	extern const struct seq_operations cpuinfo_op;

	/* Provide information about the chip model. */
	extern char chip_model[64];

	/* Data on which physical memory controller corresponds to which NUMA node. */
	extern int node_controller[];

	#if CHIP_HAS_CBOX_HOME_MAP()
	/* Does the heap allocator return hash-for-home pages by default? */
	extern int hash_default;

	/* Should kernel stack pages be hash-for-home? */
	extern int kstack_hash;

	/* Does MAP_ANONYMOUS return hash-for-home pages by default? */
	#define uheap_hash hash_default

	#else
	#define hash_default 0
	#define kstack_hash 0
	#define uheap_hash 0
	#endif

	/* Are we using huge pages in the TLB for kernel data? */
	extern int kdata_huge;

	/* Support standard Linux prefetching. */
	#define ARCH_HAS_PREFETCH
	#define prefetch(x) __builtin_prefetch(x)
	#define PREFETCH_STRIDE CHIP_L2_LINE_SIZE()

	/* Bring a value into the L1D, faulting the TLB if necessary. */
	#ifdef __tilegx__
	#define prefetch_L1(x) __insn_prefetch_l1_fault((void *)(x))
	#else
	#define prefetch_L1(x) __insn_prefetch_L1((void *)(x))
	#endif

	#else /* __ASSEMBLY__ */

	/* Do some slow action (e.g. read a slow SPR). */
	#define CPU_RELAX mfspr zero, SPR_PASS

	#endif /* !__ASSEMBLY__ */

	/* Assembly code assumes that the PL is in the low bits. */
	#if SPR_EX_CONTEXT_1_1__PL_SHIFT != 0
	# error Fix assembly assumptions about PL
	#endif

	/* We sometimes use these macros for EX_CONTEXT_0_1 as well. */
	#if SPR_EX_CONTEXT_1_1__PL_SHIFT != SPR_EX_CONTEXT_0_1__PL_SHIFT \|\| \
	SPR_EX_CONTEXT_1_1__PL_RMASK != SPR_EX_CONTEXT_0_1__PL_RMASK \|\| \
	SPR_EX_CONTEXT_1_1__ICS_SHIFT != SPR_EX_CONTEXT_0_1__ICS_SHIFT \|\| \
	SPR_EX_CONTEXT_1_1__ICS_RMASK != SPR_EX_CONTEXT_0_1__ICS_RMASK
	# error Fix assumptions that EX1 macros work for both PL0 and PL1
	#endif

	/* Allow pulling apart and recombining the PL and ICS bits in EX_CONTEXT. */
	#define EX1_PL(ex1) \
	(((ex1) >> SPR_EX_CONTEXT_1_1__PL_SHIFT) & SPR_EX_CONTEXT_1_1__PL_RMASK)
	#define EX1_ICS(ex1) \
	(((ex1) >> SPR_EX_CONTEXT_1_1__ICS_SHIFT) & SPR_EX_CONTEXT_1_1__ICS_RMASK)
	#define PL_ICS_EX1(pl, ics) \
	(((pl) << SPR_EX_CONTEXT_1_1__PL_SHIFT) \| \
	((ics) << SPR_EX_CONTEXT_1_1__ICS_SHIFT))

	/*
	* Provide symbolic constants for PLs.
	* Note that assembly code assumes that USER_PL is zero.
	*/
	#define USER_PL 0
	#if CONFIG_KERNEL_PL == 2
	#define GUEST_PL 1
	#endif
	#define KERNEL_PL CONFIG_KERNEL_PL

	/* SYSTEM_SAVE_K_0 holds the current cpu number ORed with ksp0. */
	#define CPU_LOG_MASK_VALUE 12
	#define CPU_MASK_VALUE ((1 << CPU_LOG_MASK_VALUE) - 1)
	#if CONFIG_NR_CPUS > CPU_MASK_VALUE
	# error Too many cpus!
	#endif
	#define raw_smp_processor_id() \
	((int)__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & CPU_MASK_VALUE)
	#define get_current_ksp0() \
	(__insn_mfspr(SPR_SYSTEM_SAVE_K_0) & ~CPU_MASK_VALUE)
	#define next_current_ksp0(task) ({ \
	unsigned long __ksp0 = task_ksp0(task); \
	int __cpu = raw_smp_processor_id(); \
	BUG_ON(__ksp0 & CPU_MASK_VALUE); \
	__ksp0 \| __cpu; \
	})

	#endif /* _ASM_TILE_PROCESSOR_H */