include/asm-parisc/processor.h - maze/linux - Git at Google

 /*
  * include/asm-parisc/processor.h
  *
  * Copyright (C) 1994 Linus Torvalds
  * Copyright (C) 2001 Grant Grundler
  */

 #ifndef __ASM_PARISC_PROCESSOR_H
 #define __ASM_PARISC_PROCESSOR_H

 #ifndef __ASSEMBLY__
 #include <linux/threads.h>

 #include <asm/prefetch.h>
 #include <asm/hardware.h>
 #include <asm/pdc.h>
 #include <asm/ptrace.h>
 #include <asm/types.h>
 #include <asm/system.h>
 #endif /* __ASSEMBLY__ */

 #define KERNEL_STACK_SIZE 	(4*PAGE_SIZE)

 /*
  * Default implementation of macro that returns current
  * instruction pointer ("program counter").
  */
 #ifdef CONFIG_PA20
 #define current_ia(x)	__asm__("mfia %0" : "=r"(x))
 #else /* mfia added in pa2.0 */
 #define current_ia(x)	__asm__("blr 0,%0\n\tnop" : "=r"(x))
 #endif
 #define current_text_addr() ({ void *pc; current_ia(pc); pc; })

 #define TASK_SIZE               (current->thread.task_size)
 #define TASK_UNMAPPED_BASE      (current->thread.map_base)

 #define DEFAULT_TASK_SIZE32	(0xFFF00000UL)
 #define DEFAULT_MAP_BASE32	(0x40000000UL)

 #ifdef __LP64__
 #define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
 #define DEFAULT_MAP_BASE        (0x200000000UL)
 #else
 #define DEFAULT_TASK_SIZE	DEFAULT_TASK_SIZE32
 #define DEFAULT_MAP_BASE	DEFAULT_MAP_BASE32
 #endif

 #ifndef __ASSEMBLY__

 /*
  * Data detected about CPUs at boot time which is the same for all CPU's.
  * HP boxes are SMP - ie identical processors.
  *
  * FIXME: some CPU rev info may be processor specific...
  */
 struct system_cpuinfo_parisc {
 	unsigned int	cpu_count;
 	unsigned int	cpu_hz;
 	unsigned int	hversion;
 	unsigned int	sversion;
 	enum cpu_type	cpu_type;

 	struct {
 		struct pdc_model model;
 		unsigned long versions;
 		unsigned long cpuid;
 		unsigned long capabilities;
 		char   sys_model_name[81]; /* PDC-ROM returnes this model name */
 	} pdc;

 	char		*cpu_name;	/* e.g. "PA7300LC (PCX-L2)" */
 	char		*family_name;	/* e.g. "1.1e" */
 };


 /* Per CPU data structure - ie varies per CPU.  */
 struct cpuinfo_parisc {
 	unsigned long it_value;     /* Interval Timer at last timer Intr */
 	unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
 	unsigned long irq_count;    /* number of IRQ's since boot */
 	unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
 	unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
 	unsigned long hpa;          /* Host Physical address */
 	unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
 #ifdef CONFIG_SMP
 	unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
 	unsigned long ipi_count;    /* number ipi Interrupts */
 #endif
 	unsigned long bh_count;     /* number of times bh was invoked */
 	unsigned long prof_counter; /* per CPU profiling support */
 	unsigned long prof_multiplier;	/* per CPU profiling support */
 	unsigned long fp_rev;
 	unsigned long fp_model;
 	unsigned int state;
 	struct parisc_device *dev;
 	unsigned long loops_per_jiffy;
 };

 extern struct system_cpuinfo_parisc boot_cpu_data;
 extern struct cpuinfo_parisc cpu_data[NR_CPUS];
 #define current_cpu_data cpu_data[smp_processor_id()]

 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)

 typedef struct {
 	int seg;
 } mm_segment_t;

 #define ARCH_MIN_TASKALIGN	8

 struct thread_struct {
 	struct pt_regs regs;
 	unsigned long  task_size;
 	unsigned long  map_base;
 	unsigned long  flags;
 };

 /* Thread struct flags. */
 #define PARISC_UAC_NOPRINT	(1UL << 0)	/* see prctl and unaligned.c */
 #define PARISC_UAC_SIGBUS	(1UL << 1)
 #define PARISC_KERNEL_DEATH	(1UL << 31)	/* see die_if_kernel()... */

 #define PARISC_UAC_SHIFT	0
 #define PARISC_UAC_MASK		(PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)

 #define SET_UNALIGN_CTL(task,value)                                       \
         ({                                                                \
         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
                                 | (((value) << PARISC_UAC_SHIFT) &        \
                                    PARISC_UAC_MASK));                     \
         0;                                                                \
         })

 #define GET_UNALIGN_CTL(task,addr)                                        \
         ({                                                                \
         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
         })

 #define INIT_THREAD { \
 	.regs = {	.gr	= { 0, }, \
 			.fr	= { 0, }, \
 			.sr	= { 0, }, \
 			.iasq	= { 0, }, \
 			.iaoq	= { 0, }, \
 			.cr27	= 0, \
 		}, \
 	.task_size	= DEFAULT_TASK_SIZE, \
 	.map_base	= DEFAULT_MAP_BASE, \
 	.flags		= 0 \
 	}

 /*
  * Return saved PC of a blocked thread.  This is used by ps mostly.
  */

 unsigned long thread_saved_pc(struct task_struct *t);
 void show_trace(struct task_struct *task, unsigned long *stack);

 /*
  * Start user thread in another space.
  *
  * Note that we set both the iaoq and r31 to the new pc. When
  * the kernel initially calls execve it will return through an
  * rfi path that will use the values in the iaoq. The execve
  * syscall path will return through the gateway page, and
  * that uses r31 to branch to.
  *
  * For ELF we clear r23, because the dynamic linker uses it to pass
  * the address of the finalizer function.
  *
  * We also initialize sr3 to an illegal value (illegal for our
  * implementation, not for the architecture).
  */
 typedef unsigned int elf_caddr_t;

 #define start_thread_som(regs, new_pc, new_sp) do {	\
 	unsigned long *sp = (unsigned long *)new_sp;	\
 	__u32 spaceid = (__u32)current->mm->context;	\
 	unsigned long pc = (unsigned long)new_pc;	\
 	/* offset pc for priv. level */			\
 	pc |= 3;					\
 							\
 	set_fs(USER_DS);				\
 	regs->iasq[0] = spaceid;			\
 	regs->iasq[1] = spaceid;			\
 	regs->iaoq[0] = pc;				\
 	regs->iaoq[1] = pc + 4;                         \
 	regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 	regs->sr[3] = 0xffff;				\
 	regs->sr[4] = spaceid;				\
 	regs->sr[5] = spaceid;				\
 	regs->sr[6] = spaceid;				\
 	regs->sr[7] = spaceid;				\
 	regs->gr[ 0] = USER_PSW;                        \
 	regs->gr[30] = ((new_sp)+63)&~63;		\
 	regs->gr[31] = pc;				\
 							\
 	get_user(regs->gr[26],&sp[0]);			\
 	get_user(regs->gr[25],&sp[-1]); 		\
 	get_user(regs->gr[24],&sp[-2]); 		\
 	get_user(regs->gr[23],&sp[-3]); 		\
 } while(0)

 /* The ELF abi wants things done a "wee bit" differently than
  * som does.  Supporting this behavior here avoids
  * having our own version of create_elf_tables.
  *
  * Oh, and yes, that is not a typo, we are really passing argc in r25
  * and argv in r24 (rather than r26 and r25).  This is because that's
  * where __libc_start_main wants them.
  *
  * Duplicated from dl-machine.h for the benefit of readers:
  *
  *  Our initial stack layout is rather different from everyone else's
  *  due to the unique PA-RISC ABI.  As far as I know it looks like
  *  this:

    -----------------------------------  (user startup code creates this frame)
    |         32 bytes of magic       |
    |---------------------------------|
    | 32 bytes argument/sp save area  |
    |---------------------------------| (bprm->p)
    |	    ELF auxiliary info	     |
    |         (up to 28 words)        |
    |---------------------------------|
    |		   NULL		     |
    |---------------------------------|
    |	   Environment pointers	     |
    |---------------------------------|
    |		   NULL		     |
    |---------------------------------|
    |        Argument pointers        |
    |---------------------------------| <- argv
    |          argc (1 word)          |
    |---------------------------------| <- bprm->exec (HACK!)
    |         N bytes of slack        |
    |---------------------------------|
    |	filename passed to execve    |
    |---------------------------------| (mm->env_end)
    |           env strings           |
    |---------------------------------| (mm->env_start, mm->arg_end)
    |           arg strings           |
    |---------------------------------|
    | additional faked arg strings if |
    | we're invoked via binfmt_script |
    |---------------------------------| (mm->arg_start)
    stack base is at TASK_SIZE - rlim_max.

 on downward growing arches, it looks like this:
    stack base at TASK_SIZE
    | filename passed to execve
    | env strings
    | arg strings
    | faked arg strings
    | slack
    | ELF
    | envps
    | argvs
    | argc

  *  The pleasant part of this is that if we need to skip arguments we
  *  can just decrement argc and move argv, because the stack pointer
  *  is utterly unrelated to the location of the environment and
  *  argument vectors.
  *
  * Note that the S/390 people took the easy way out and hacked their
  * GCC to make the stack grow downwards.
  *
  * Final Note: For entry from syscall, the W (wide) bit of the PSW
  * is stuffed into the lowest bit of the user sp (%r30), so we fill
  * it in here from the current->personality
  */

 #ifdef __LP64__
 #define USER_WIDE_MODE	(!test_thread_flag(TIF_32BIT))
 #else
 #define USER_WIDE_MODE	0
 #endif

 #define start_thread(regs, new_pc, new_sp) do {		\
 	elf_addr_t *sp = (elf_addr_t *)new_sp;		\
 	__u32 spaceid = (__u32)current->mm->context;	\
 	elf_addr_t pc = (elf_addr_t)new_pc | 3;		\
 	elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;	\
 							\
 	set_fs(USER_DS);				\
 	regs->iasq[0] = spaceid;			\
 	regs->iasq[1] = spaceid;			\
 	regs->iaoq[0] = pc;				\
 	regs->iaoq[1] = pc + 4;                         \
 	regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 	regs->sr[3] = 0xffff;				\
 	regs->sr[4] = spaceid;				\
 	regs->sr[5] = spaceid;				\
 	regs->sr[6] = spaceid;				\
 	regs->sr[7] = spaceid;				\
 	regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 	regs->fr[ 0] = 0LL;                            	\
 	regs->fr[ 1] = 0LL;                            	\
 	regs->fr[ 2] = 0LL;                            	\
 	regs->fr[ 3] = 0LL;                            	\
 	regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 	regs->gr[31] = pc;				\
 							\
 	get_user(regs->gr[25], (argv - 1));		\
 	regs->gr[24] = (long) argv;			\
 	regs->gr[23] = 0;				\
 } while(0)

 struct task_struct;
 struct mm_struct;

 /* Free all resources held by a thread. */
 extern void release_thread(struct task_struct *);
 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

 /* Prepare to copy thread state - unlazy all lazy status */
 #define prepare_to_copy(tsk)	do { } while (0)

 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);

 extern unsigned long get_wchan(struct task_struct *p);

 #define KSTK_EIP(tsk)	((tsk)->thread.regs.iaoq[0])
 #define KSTK_ESP(tsk)	((tsk)->thread.regs.gr[30])

 #define cpu_relax()	barrier()

 /* Used as a macro to identify the combined VIPT/PIPT cached
  * CPUs which require a guarantee of coherency (no inequivalent
  * aliases with different data, whether clean or not) to operate */
 static inline int parisc_requires_coherency(void)
 {
 #ifdef CONFIG_PA8X00
 	/* FIXME: also pa8900 - when we see one */
 	return boot_cpu_data.cpu_type == mako;
 #else
 	return 0;
 #endif
 }

 #endif /* __ASSEMBLY__ */

 #endif /* __ASM_PARISC_PROCESSOR_H */
	/*
	* include/asm-parisc/processor.h
	*
	* Copyright (C) 1994 Linus Torvalds
	* Copyright (C) 2001 Grant Grundler
	*/

	#ifndef __ASM_PARISC_PROCESSOR_H
	#define __ASM_PARISC_PROCESSOR_H

	#ifndef __ASSEMBLY__
	#include <linux/threads.h>

	#include <asm/prefetch.h>
	#include <asm/hardware.h>
	#include <asm/pdc.h>
	#include <asm/ptrace.h>
	#include <asm/types.h>
	#include <asm/system.h>
	#endif /* __ASSEMBLY__ */

	#define KERNEL_STACK_SIZE (4*PAGE_SIZE)

	/*
	* Default implementation of macro that returns current
	* instruction pointer ("program counter").
	*/
	#ifdef CONFIG_PA20
	#define current_ia(x) __asm__("mfia %0" : "=r"(x))
	#else /* mfia added in pa2.0 */
	#define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x))
	#endif
	#define current_text_addr() ({ void *pc; current_ia(pc); pc; })

	#define TASK_SIZE (current->thread.task_size)
	#define TASK_UNMAPPED_BASE (current->thread.map_base)

	#define DEFAULT_TASK_SIZE32 (0xFFF00000UL)
	#define DEFAULT_MAP_BASE32 (0x40000000UL)

	#ifdef __LP64__
	#define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000)
	#define DEFAULT_MAP_BASE (0x200000000UL)
	#else
	#define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32
	#define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32
	#endif

	#ifndef __ASSEMBLY__

	/*
	* Data detected about CPUs at boot time which is the same for all CPU's.
	* HP boxes are SMP - ie identical processors.
	*
	* FIXME: some CPU rev info may be processor specific...
	*/
	struct system_cpuinfo_parisc {
	unsigned int cpu_count;
	unsigned int cpu_hz;
	unsigned int hversion;
	unsigned int sversion;
	enum cpu_type cpu_type;

	struct {
	struct pdc_model model;
	unsigned long versions;
	unsigned long cpuid;
	unsigned long capabilities;
	char sys_model_name[81]; /* PDC-ROM returnes this model name */
	} pdc;

	char cpu_name; / e.g. "PA7300LC (PCX-L2)" */
	char family_name; / e.g. "1.1e" */
	};


	/* Per CPU data structure - ie varies per CPU. */
	struct cpuinfo_parisc {
	unsigned long it_value; /* Interval Timer at last timer Intr */
	unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */
	unsigned long irq_count; /* number of IRQ's since boot */
	unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
	unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */
	unsigned long hpa; /* Host Physical address */
	unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
	#ifdef CONFIG_SMP
	unsigned long pending_ipi; /* bitmap of type ipi_message_type */
	unsigned long ipi_count; /* number ipi Interrupts */
	#endif
	unsigned long bh_count; /* number of times bh was invoked */
	unsigned long prof_counter; /* per CPU profiling support */
	unsigned long prof_multiplier; /* per CPU profiling support */
	unsigned long fp_rev;
	unsigned long fp_model;
	unsigned int state;
	struct parisc_device *dev;
	unsigned long loops_per_jiffy;
	};

	extern struct system_cpuinfo_parisc boot_cpu_data;
	extern struct cpuinfo_parisc cpu_data[NR_CPUS];
	#define current_cpu_data cpu_data[smp_processor_id()]

	#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)

	typedef struct {
	int seg;
	} mm_segment_t;

	#define ARCH_MIN_TASKALIGN 8

	struct thread_struct {
	struct pt_regs regs;
	unsigned long task_size;
	unsigned long map_base;
	unsigned long flags;
	};

	/* Thread struct flags. */
	#define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */
	#define PARISC_UAC_SIGBUS (1UL << 1)
	#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */

	#define PARISC_UAC_SHIFT 0
	#define PARISC_UAC_MASK (PARISC_UAC_NOPRINT\|PARISC_UAC_SIGBUS)

	#define SET_UNALIGN_CTL(task,value) \
	({ \
	(task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
	\| (((value) << PARISC_UAC_SHIFT) & \
	PARISC_UAC_MASK)); \
	0; \
	})

	#define GET_UNALIGN_CTL(task,addr) \
	({ \
	put_user(((task)->thread.flags & PARISC_UAC_MASK) \
	>> PARISC_UAC_SHIFT, (int __user *) (addr)); \
	})

	#define INIT_THREAD { \
	.regs = { .gr = { 0, }, \
	.fr = { 0, }, \
	.sr = { 0, }, \
	.iasq = { 0, }, \
	.iaoq = { 0, }, \
	.cr27 = 0, \
	}, \
	.task_size = DEFAULT_TASK_SIZE, \
	.map_base = DEFAULT_MAP_BASE, \
	.flags = 0 \
	}

	/*
	* Return saved PC of a blocked thread. This is used by ps mostly.
	*/

	unsigned long thread_saved_pc(struct task_struct *t);
	void show_trace(struct task_struct task, unsigned long stack);

	/*
	* Start user thread in another space.
	*
	* Note that we set both the iaoq and r31 to the new pc. When
	* the kernel initially calls execve it will return through an
	* rfi path that will use the values in the iaoq. The execve
	* syscall path will return through the gateway page, and
	* that uses r31 to branch to.
	*
	* For ELF we clear r23, because the dynamic linker uses it to pass
	* the address of the finalizer function.
	*
	* We also initialize sr3 to an illegal value (illegal for our
	* implementation, not for the architecture).
	*/
	typedef unsigned int elf_caddr_t;

	#define start_thread_som(regs, new_pc, new_sp) do { \
	unsigned long sp = (unsigned long )new_sp; \
	__u32 spaceid = (__u32)current->mm->context; \
	unsigned long pc = (unsigned long)new_pc; \
	/* offset pc for priv. level */ \
	pc \|= 3; \
	\
	set_fs(USER_DS); \
	regs->iasq[0] = spaceid; \
	regs->iasq[1] = spaceid; \
	regs->iaoq[0] = pc; \
	regs->iaoq[1] = pc + 4; \
	regs->sr[2] = LINUX_GATEWAY_SPACE; \
	regs->sr[3] = 0xffff; \
	regs->sr[4] = spaceid; \
	regs->sr[5] = spaceid; \
	regs->sr[6] = spaceid; \
	regs->sr[7] = spaceid; \
	regs->gr[ 0] = USER_PSW; \
	regs->gr[30] = ((new_sp)+63)&~63; \
	regs->gr[31] = pc; \
	\
	get_user(regs->gr[26],&sp[0]); \
	get_user(regs->gr[25],&sp[-1]); \
	get_user(regs->gr[24],&sp[-2]); \
	get_user(regs->gr[23],&sp[-3]); \
	} while(0)

	/* The ELF abi wants things done a "wee bit" differently than
	* som does. Supporting this behavior here avoids
	* having our own version of create_elf_tables.
	*
	* Oh, and yes, that is not a typo, we are really passing argc in r25
	* and argv in r24 (rather than r26 and r25). This is because that's
	* where __libc_start_main wants them.
	*
	* Duplicated from dl-machine.h for the benefit of readers:
	*
	* Our initial stack layout is rather different from everyone else's
	* due to the unique PA-RISC ABI. As far as I know it looks like
	* this:

	----------------------------------- (user startup code creates this frame)
	\| 32 bytes of magic \|
	\|---------------------------------\|
	\| 32 bytes argument/sp save area \|
	\|---------------------------------\| (bprm->p)
	\| ELF auxiliary info \|
	\| (up to 28 words) \|
	\|---------------------------------\|
	\| NULL \|
	\|---------------------------------\|
	\| Environment pointers \|
	\|---------------------------------\|
	\| NULL \|
	\|---------------------------------\|
	\| Argument pointers \|
	\|---------------------------------\| <- argv
	\| argc (1 word) \|
	\|---------------------------------\| <- bprm->exec (HACK!)
	\| N bytes of slack \|
	\|---------------------------------\|
	\| filename passed to execve \|
	\|---------------------------------\| (mm->env_end)
	\| env strings \|
	\|---------------------------------\| (mm->env_start, mm->arg_end)
	\| arg strings \|
	\|---------------------------------\|
	\| additional faked arg strings if \|
	\| we're invoked via binfmt_script \|
	\|---------------------------------\| (mm->arg_start)
	stack base is at TASK_SIZE - rlim_max.

	on downward growing arches, it looks like this:
	stack base at TASK_SIZE
	\| filename passed to execve
	\| env strings
	\| arg strings
	\| faked arg strings
	\| slack
	\| ELF
	\| envps
	\| argvs
	\| argc

	* The pleasant part of this is that if we need to skip arguments we
	* can just decrement argc and move argv, because the stack pointer
	* is utterly unrelated to the location of the environment and
	* argument vectors.
	*
	* Note that the S/390 people took the easy way out and hacked their
	* GCC to make the stack grow downwards.
	*
	* Final Note: For entry from syscall, the W (wide) bit of the PSW
	* is stuffed into the lowest bit of the user sp (%r30), so we fill
	* it in here from the current->personality
	*/

	#ifdef __LP64__
	#define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
	#else
	#define USER_WIDE_MODE 0
	#endif

	#define start_thread(regs, new_pc, new_sp) do { \
	elf_addr_t sp = (elf_addr_t )new_sp; \
	__u32 spaceid = (__u32)current->mm->context; \
	elf_addr_t pc = (elf_addr_t)new_pc \| 3; \
	elf_caddr_t argv = (elf_caddr_t )bprm->exec + 1; \
	\
	set_fs(USER_DS); \
	regs->iasq[0] = spaceid; \
	regs->iasq[1] = spaceid; \
	regs->iaoq[0] = pc; \
	regs->iaoq[1] = pc + 4; \
	regs->sr[2] = LINUX_GATEWAY_SPACE; \
	regs->sr[3] = 0xffff; \
	regs->sr[4] = spaceid; \
	regs->sr[5] = spaceid; \
	regs->sr[6] = spaceid; \
	regs->sr[7] = spaceid; \
	regs->gr[ 0] = USER_PSW \| (USER_WIDE_MODE ? PSW_W : 0); \
	regs->fr[ 0] = 0LL; \
	regs->fr[ 1] = 0LL; \
	regs->fr[ 2] = 0LL; \
	regs->fr[ 3] = 0LL; \
	regs->gr[30] = (((unsigned long)sp + 63) &~ 63) \| (USER_WIDE_MODE ? 1 : 0); \
	regs->gr[31] = pc; \
	\
	get_user(regs->gr[25], (argv - 1)); \
	regs->gr[24] = (long) argv; \
	regs->gr[23] = 0; \
	} while(0)

	struct task_struct;
	struct mm_struct;

	/* Free all resources held by a thread. */
	extern void release_thread(struct task_struct *);
	extern int kernel_thread(int (fn)(void ), void * arg, unsigned long flags);

	/* Prepare to copy thread state - unlazy all lazy status */
	#define prepare_to_copy(tsk) do { } while (0)

	extern void map_hpux_gateway_page(struct task_struct tsk, struct mm_struct mm);

	extern unsigned long get_wchan(struct task_struct *p);

	#define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
	#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])

	#define cpu_relax() barrier()

	/* Used as a macro to identify the combined VIPT/PIPT cached
	* CPUs which require a guarantee of coherency (no inequivalent
	* aliases with different data, whether clean or not) to operate */
	static inline int parisc_requires_coherency(void)
	{
	#ifdef CONFIG_PA8X00
	/* FIXME: also pa8900 - when we see one */
	return boot_cpu_data.cpu_type == mako;
	#else
	return 0;
	#endif
	}

	#endif /* __ASSEMBLY__ */

	#endif /* __ASM_PARISC_PROCESSOR_H */