[linux-2.6-block.git] / arch / parisc / include / asm / processor.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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/percpu.h>
#endif /* __ASSEMBLY__ */

/*
 * 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 HAVE_ARCH_PICK_MMAP_LAYOUT

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

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

#ifdef CONFIG_64BIT
#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

#ifdef __KERNEL__

/* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
 * prumpf */

#define STACK_TOP	TASK_SIZE
#define STACK_TOP_MAX	DEFAULT_TASK_SIZE

/* Allow bigger stacks for 64-bit processes */
#define STACK_SIZE_MAX	(USER_WIDE_MODE					\
			 ? (1 << 30)	/* 1 GB */			\
			 : (CONFIG_MAX_STACK_SIZE_MB*1024*1024))

#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;

	const char	*cpu_name;	/* e.g. "PA7300LC (PCX-L2)" */
	const 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 irq_count;    /* number of IRQ's since boot */
	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 */
#endif
	unsigned long bh_count;     /* number of times bh was invoked */
	unsigned long fp_rev;
	unsigned long fp_model;
	unsigned long cpu_num;      /* CPU number from PAT firmware */
	unsigned long cpu_loc;      /* CPU location from PAT firmware */
	unsigned int state;
	struct parisc_device *dev;
	unsigned long loops_per_jiffy;
};

extern struct system_cpuinfo_parisc boot_cpu_data;
DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);

#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;
}; 

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

/* 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 \
	}

struct task_struct;
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;

/* 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 CONFIG_64BIT
#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;	\
							\
	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 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()

/*
 * parisc_requires_coherency() is used 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
 */
#ifdef CONFIG_PA8X00
extern int _parisc_requires_coherency;
#define parisc_requires_coherency()	_parisc_requires_coherency
#else
#define parisc_requires_coherency()	(0)
#endif

#endif /* __ASSEMBLY__ */

#endif /* __ASM_PARISC_PROCESSOR_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	/*
	3	* include/asm-parisc/processor.h
	4	*
	5	* Copyright (C) 1994 Linus Torvalds
	6	* Copyright (C) 2001 Grant Grundler
	7	*/
	8
	9	#ifndef __ASM_PARISC_PROCESSOR_H
	10	#define __ASM_PARISC_PROCESSOR_H
	11
	12	#ifndef __ASSEMBLY__
1da177e4 LT	13	#include <linux/threads.h>
1da177e4 LT	14
959f4f13	15	#include <asm/prefetch.h>
1da177e4	16	#include <asm/hardware.h>
1da177e4 LT	17	#include <asm/pdc.h>
	18	#include <asm/ptrace.h>
	19	#include <asm/types.h>
ef017beb	20	#include <asm/percpu.h>
1da177e4 LT	21	#endif /* __ASSEMBLY__ */
1da177e4 LT	22
1da177e4 LT	23	/*
	24	* Default implementation of macro that returns current
	25	* instruction pointer ("program counter").
	26	*/
1b6d1b5e KM	27	#ifdef CONFIG_PA20
	28	#define current_ia(x) __asm__("mfia %0" : "=r"(x))
	29	#else /* mfia added in pa2.0 */
	30	#define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x))
	31	#endif
	32	#define current_text_addr() ({ void *pc; current_ia(pc); pc; })
1da177e4	33
9dabf60d HD	34	#define HAVE_ARCH_PICK_MMAP_LAYOUT
9dabf60d HD	35
82455257 DH	36	#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size)
82455257 DH	37	#define TASK_SIZE TASK_SIZE_OF(current)
1da177e4 LT	38	#define TASK_UNMAPPED_BASE (current->thread.map_base)
	39
	40	#define DEFAULT_TASK_SIZE32 (0xFFF00000UL)
	41	#define DEFAULT_MAP_BASE32 (0x40000000UL)
	42
513e7ecd	43	#ifdef CONFIG_64BIT
1da177e4 LT	44	#define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000)
	45	#define DEFAULT_MAP_BASE (0x200000000UL)
	46	#else
	47	#define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32
	48	#define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32
	49	#endif
	50
922a70d3 DH	51	#ifdef __KERNEL__
	52
	53	/* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
	54	* prumpf */
	55
	56	#define STACK_TOP TASK_SIZE
	57	#define STACK_TOP_MAX DEFAULT_TASK_SIZE
	58
042d27ac HD	59	/* Allow bigger stacks for 64-bit processes */
	60	#define STACK_SIZE_MAX (USER_WIDE_MODE \
	61	? (1 << 30) /* 1 GB */ \
	62	: (CONFIG_MAX_STACK_SIZE_MB10241024))
d71f290b	63
922a70d3 DH	64	#endif
922a70d3 DH	65
1da177e4 LT	66	#ifndef __ASSEMBLY__
	67
	68	/*
	69	* Data detected about CPUs at boot time which is the same for all CPU's.
	70	* HP boxes are SMP - ie identical processors.
	71	*
	72	* FIXME: some CPU rev info may be processor specific...
	73	*/
	74	struct system_cpuinfo_parisc {
	75	unsigned int cpu_count;
	76	unsigned int cpu_hz;
	77	unsigned int hversion;
	78	unsigned int sversion;
	79	enum cpu_type cpu_type;
	80
	81	struct {
	82	struct pdc_model model;
	83	unsigned long versions;
	84	unsigned long cpuid;
	85	unsigned long capabilities;
	86	char sys_model_name[81]; /* PDC-ROM returnes this model name */
	87	} pdc;
	88
e9541d0c HD	89	const char cpu_name; / e.g. "PA7300LC (PCX-L2)" */
e9541d0c HD	90	const char family_name; / e.g. "1.1e" */
1da177e4 LT	91	};
	92
	93
	94	/* Per CPU data structure - ie varies per CPU. */
	95	struct cpuinfo_parisc {
	96	unsigned long it_value; /* Interval Timer at last timer Intr */
1da177e4	97	unsigned long irq_count; /* number of IRQ's since boot */
1da177e4 LT	98	unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */
	99	unsigned long hpa; /* Host Physical address */
	100	unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
	101	#ifdef CONFIG_SMP
1da177e4	102	unsigned long pending_ipi; /* bitmap of type ipi_message_type */
1da177e4 LT	103	#endif
1da177e4 LT	104	unsigned long bh_count; /* number of times bh was invoked */
1da177e4 LT	105	unsigned long fp_rev;
1da177e4 LT	106	unsigned long fp_model;
c8c37359 HD	107	unsigned long cpu_num; /* CPU number from PAT firmware */
c8c37359 HD	108	unsigned long cpu_loc; /* CPU location from PAT firmware */
1da177e4 LT	109	unsigned int state;
	110	struct parisc_device *dev;
	111	unsigned long loops_per_jiffy;
	112	};
	113
	114	extern struct system_cpuinfo_parisc boot_cpu_data;
ef017beb	115	DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
1da177e4 LT	116
	117	#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
	118
	119	typedef struct {
	120	int seg;
	121	} mm_segment_t;
	122
	123	#define ARCH_MIN_TASKALIGN 8
	124
	125	struct thread_struct {
	126	struct pt_regs regs;
	127	unsigned long task_size;
	128	unsigned long map_base;
	129	unsigned long flags;
	130	};
	131
abf1e11a KM	132	#define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
abf1e11a KM	133
1da177e4	134	/* Thread struct flags. */
f053725b KM	135	#define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */
f053725b KM	136	#define PARISC_UAC_SIGBUS (1UL << 1)
1da177e4 LT	137	#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */
1da177e4 LT	138
f053725b KM	139	#define PARISC_UAC_SHIFT 0
	140	#define PARISC_UAC_MASK (PARISC_UAC_NOPRINT\|PARISC_UAC_SIGBUS)
	141
	142	#define SET_UNALIGN_CTL(task,value) \
	143	({ \
	144	(task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
	145	\| (((value) << PARISC_UAC_SHIFT) & \
	146	PARISC_UAC_MASK)); \
	147	0; \
	148	})
	149
	150	#define GET_UNALIGN_CTL(task,addr) \
	151	({ \
	152	put_user(((task)->thread.flags & PARISC_UAC_MASK) \
	153	>> PARISC_UAC_SHIFT, (int __user *) (addr)); \
	154	})
	155
1da177e4	156	#define INIT_THREAD { \
02d79800 AD	157	.regs = { .gr = { 0, }, \
	158	.fr = { 0, }, \
	159	.sr = { 0, }, \
	160	.iasq = { 0, }, \
	161	.iaoq = { 0, }, \
	162	.cr27 = 0, \
1da177e4	163	}, \
02d79800 AD	164	.task_size = DEFAULT_TASK_SIZE, \
	165	.map_base = DEFAULT_MAP_BASE, \
	166	.flags = 0 \
1da177e4 LT	167	}
1da177e4 LT	168
527dcdcc	169	struct task_struct;
1da177e4 LT	170	void show_trace(struct task_struct task, unsigned long stack);
	171
	172	/*
	173	* Start user thread in another space.
	174	*
	175	* Note that we set both the iaoq and r31 to the new pc. When
	176	* the kernel initially calls execve it will return through an
	177	* rfi path that will use the values in the iaoq. The execve
	178	* syscall path will return through the gateway page, and
	179	* that uses r31 to branch to.
	180	*
	181	* For ELF we clear r23, because the dynamic linker uses it to pass
	182	* the address of the finalizer function.
	183	*
	184	* We also initialize sr3 to an illegal value (illegal for our
	185	* implementation, not for the architecture).
	186	*/
	187	typedef unsigned int elf_caddr_t;
	188
1da177e4 LT	189	/* The ELF abi wants things done a "wee bit" differently than
	190	* som does. Supporting this behavior here avoids
	191	* having our own version of create_elf_tables.
	192	*
	193	* Oh, and yes, that is not a typo, we are really passing argc in r25
	194	* and argv in r24 (rather than r26 and r25). This is because that's
	195	* where __libc_start_main wants them.
	196	*
	197	* Duplicated from dl-machine.h for the benefit of readers:
	198	*
	199	* Our initial stack layout is rather different from everyone else's
	200	* due to the unique PA-RISC ABI. As far as I know it looks like
	201	* this:
	202
	203	----------------------------------- (user startup code creates this frame)
	204	\| 32 bytes of magic \|
	205	\|---------------------------------\|
	206	\| 32 bytes argument/sp save area \|
	207	\|---------------------------------\| (bprm->p)
	208	\| ELF auxiliary info \|
	209	\| (up to 28 words) \|
	210	\|---------------------------------\|
	211	\| NULL \|
	212	\|---------------------------------\|
	213	\| Environment pointers \|
	214	\|---------------------------------\|
	215	\| NULL \|
	216	\|---------------------------------\|
	217	\| Argument pointers \|
	218	\|---------------------------------\| <- argv
	219	\| argc (1 word) \|
	220	\|---------------------------------\| <- bprm->exec (HACK!)
	221	\| N bytes of slack \|
	222	\|---------------------------------\|
	223	\| filename passed to execve \|
	224	\|---------------------------------\| (mm->env_end)
	225	\| env strings \|
	226	\|---------------------------------\| (mm->env_start, mm->arg_end)
	227	\| arg strings \|
	228	\|---------------------------------\|
	229	\| additional faked arg strings if \|
	230	\| we're invoked via binfmt_script \|
	231	\|---------------------------------\| (mm->arg_start)
	232	stack base is at TASK_SIZE - rlim_max.
	233
	234	on downward growing arches, it looks like this:
	235	stack base at TASK_SIZE
	236	\| filename passed to execve
	237	\| env strings
	238	\| arg strings
	239	\| faked arg strings
	240	\| slack
	241	\| ELF
	242	\| envps
	243	\| argvs
	244	\| argc
	245
	246	* The pleasant part of this is that if we need to skip arguments we
	247	* can just decrement argc and move argv, because the stack pointer
	248	* is utterly unrelated to the location of the environment and
	249	* argument vectors.
	250	*
	251	* Note that the S/390 people took the easy way out and hacked their
	252	* GCC to make the stack grow downwards.
253	*
254	* Final Note: For entry from syscall, the W (wide) bit of the PSW
255	* is stuffed into the lowest bit of the user sp (%r30), so we fill
256	* it in here from the current->personality
257	*/
258
513e7ecd	259	#ifdef CONFIG_64BIT
df570b9c	260	#define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
1da177e4 LT	261	#else
	262	#define USER_WIDE_MODE 0
	263	#endif
	264
	265	#define start_thread(regs, new_pc, new_sp) do { \
	266	elf_addr_t sp = (elf_addr_t )new_sp; \
	267	__u32 spaceid = (__u32)current->mm->context; \
	268	elf_addr_t pc = (elf_addr_t)new_pc \| 3; \
	269	elf_caddr_t argv = (elf_caddr_t )bprm->exec + 1; \
	270	\
1da177e4 LT	271	regs->iasq[0] = spaceid; \
	272	regs->iasq[1] = spaceid; \
	273	regs->iaoq[0] = pc; \
	274	regs->iaoq[1] = pc + 4; \
	275	regs->sr[2] = LINUX_GATEWAY_SPACE; \
	276	regs->sr[3] = 0xffff; \
	277	regs->sr[4] = spaceid; \
	278	regs->sr[5] = spaceid; \
	279	regs->sr[6] = spaceid; \
	280	regs->sr[7] = spaceid; \
	281	regs->gr[ 0] = USER_PSW \| (USER_WIDE_MODE ? PSW_W : 0); \
	282	regs->fr[ 0] = 0LL; \
	283	regs->fr[ 1] = 0LL; \
	284	regs->fr[ 2] = 0LL; \
	285	regs->fr[ 3] = 0LL; \
	286	regs->gr[30] = (((unsigned long)sp + 63) &~ 63) \| (USER_WIDE_MODE ? 1 : 0); \
	287	regs->gr[31] = pc; \
	288	\
	289	get_user(regs->gr[25], (argv - 1)); \
	290	regs->gr[24] = (long) argv; \
	291	regs->gr[23] = 0; \
	292	} while(0)
	293
	294	struct task_struct;
	295	struct mm_struct;
	296
	297	/* Free all resources held by a thread. */
	298	extern void release_thread(struct task_struct *);
1da177e4	299
1da177e4 LT	300	extern unsigned long get_wchan(struct task_struct *p);
	301
	302	#define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
	303	#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
	304
1da177e4 LT	305	#define cpu_relax() barrier()
1da177e4 LT	306
fc632575 HD	307	/*
	308	* parisc_requires_coherency() is used to identify the combined VIPT/PIPT
	309	* cached CPUs which require a guarantee of coherency (no inequivalent aliases
	310	* with different data, whether clean or not) to operate
	311	*/
20f4d3cb	312	#ifdef CONFIG_PA8X00
fc632575 HD	313	extern int _parisc_requires_coherency;
fc632575 HD	314	#define parisc_requires_coherency() _parisc_requires_coherency
20f4d3cb	315	#else
fc632575	316	#define parisc_requires_coherency() (0)
20f4d3cb	317	#endif
20f4d3cb	318
1da177e4 LT	319	#endif /* __ASSEMBLY__ */
	320
	321	#endif /* __ASM_PARISC_PROCESSOR_H */