[mirror_ubuntu-artful-kernel.git] / arch / parisc / include / asm / 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/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 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 */
#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;
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 \
	}

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

struct task_struct;
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;					\
							\
	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 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 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
	return (boot_cpu_data.cpu_type == mako) ||
		(boot_cpu_data.cpu_type == mako2);
#else
	return 0;
#endif
}

#endif /* __ASSEMBLY__ */

#endif /* __ASM_PARISC_PROCESSOR_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* include/asm-parisc/processor.h
	3	*
	4	* Copyright (C) 1994 Linus Torvalds
	5	* Copyright (C) 2001 Grant Grundler
	6	*/
	7
	8	#ifndef __ASM_PARISC_PROCESSOR_H
	9	#define __ASM_PARISC_PROCESSOR_H
	10
	11	#ifndef __ASSEMBLY__
1da177e4 LT	12	#include <linux/threads.h>
1da177e4 LT	13
959f4f13	14	#include <asm/prefetch.h>
1da177e4	15	#include <asm/hardware.h>
1da177e4 LT	16	#include <asm/pdc.h>
	17	#include <asm/ptrace.h>
	18	#include <asm/types.h>
ef017beb	19	#include <asm/percpu.h>
1da177e4 LT	20	#endif /* __ASSEMBLY__ */
1da177e4 LT	21
1da177e4 LT	22	/*
	23	* Default implementation of macro that returns current
	24	* instruction pointer ("program counter").
	25	*/
1b6d1b5e KM	26	#ifdef CONFIG_PA20
	27	#define current_ia(x) __asm__("mfia %0" : "=r"(x))
	28	#else /* mfia added in pa2.0 */
	29	#define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x))
	30	#endif
	31	#define current_text_addr() ({ void *pc; current_ia(pc); pc; })
1da177e4	32
9dabf60d HD	33	#define HAVE_ARCH_PICK_MMAP_LAYOUT
9dabf60d HD	34
82455257 DH	35	#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size)
82455257 DH	36	#define TASK_SIZE TASK_SIZE_OF(current)
1da177e4 LT	37	#define TASK_UNMAPPED_BASE (current->thread.map_base)
	38
	39	#define DEFAULT_TASK_SIZE32 (0xFFF00000UL)
	40	#define DEFAULT_MAP_BASE32 (0x40000000UL)
	41
513e7ecd	42	#ifdef CONFIG_64BIT
1da177e4 LT	43	#define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000)
	44	#define DEFAULT_MAP_BASE (0x200000000UL)
	45	#else
	46	#define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32
	47	#define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32
	48	#endif
	49
922a70d3 DH	50	#ifdef __KERNEL__
	51
	52	/* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
	53	* prumpf */
	54
	55	#define STACK_TOP TASK_SIZE
	56	#define STACK_TOP_MAX DEFAULT_TASK_SIZE
	57
042d27ac HD	58	/* Allow bigger stacks for 64-bit processes */
	59	#define STACK_SIZE_MAX (USER_WIDE_MODE \
	60	? (1 << 30) /* 1 GB */ \
	61	: (CONFIG_MAX_STACK_SIZE_MB10241024))
d71f290b	62
922a70d3 DH	63	#endif
922a70d3 DH	64
1da177e4 LT	65	#ifndef __ASSEMBLY__
	66
	67	/*
	68	* Data detected about CPUs at boot time which is the same for all CPU's.
	69	* HP boxes are SMP - ie identical processors.
	70	*
	71	* FIXME: some CPU rev info may be processor specific...
	72	*/
	73	struct system_cpuinfo_parisc {
	74	unsigned int cpu_count;
	75	unsigned int cpu_hz;
	76	unsigned int hversion;
	77	unsigned int sversion;
	78	enum cpu_type cpu_type;
	79
	80	struct {
	81	struct pdc_model model;
	82	unsigned long versions;
	83	unsigned long cpuid;
	84	unsigned long capabilities;
	85	char sys_model_name[81]; /* PDC-ROM returnes this model name */
	86	} pdc;
	87
e9541d0c HD	88	const char cpu_name; / e.g. "PA7300LC (PCX-L2)" */
e9541d0c HD	89	const char family_name; / e.g. "1.1e" */
1da177e4 LT	90	};
	91
	92
	93	/* Per CPU data structure - ie varies per CPU. */
	94	struct cpuinfo_parisc {
	95	unsigned long it_value; /* Interval Timer at last timer Intr */
	96	unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */
	97	unsigned long irq_count; /* number of IRQ's since boot */
	98	unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
	99	unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */
	100	unsigned long hpa; /* Host Physical address */
	101	unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
	102	#ifdef CONFIG_SMP
1da177e4	103	unsigned long pending_ipi; /* bitmap of type ipi_message_type */
1da177e4 LT	104	#endif
	105	unsigned long bh_count; /* number of times bh was invoked */
	106	unsigned long prof_counter; /* per CPU profiling support */
	107	unsigned long prof_multiplier; /* per CPU profiling support */
	108	unsigned long fp_rev;
	109	unsigned long fp_model;
	110	unsigned int state;
	111	struct parisc_device *dev;
	112	unsigned long loops_per_jiffy;
	113	};
	114
	115	extern struct system_cpuinfo_parisc boot_cpu_data;
ef017beb	116	DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
1da177e4 LT	117
	118	#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
	119
	120	typedef struct {
	121	int seg;
	122	} mm_segment_t;
	123
	124	#define ARCH_MIN_TASKALIGN 8
	125
	126	struct thread_struct {
	127	struct pt_regs regs;
	128	unsigned long task_size;
	129	unsigned long map_base;
	130	unsigned long flags;
	131	};
	132
abf1e11a KM	133	#define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
abf1e11a KM	134
1da177e4	135	/* Thread struct flags. */
f053725b KM	136	#define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */
f053725b KM	137	#define PARISC_UAC_SIGBUS (1UL << 1)
1da177e4 LT	138	#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */
1da177e4 LT	139
f053725b KM	140	#define PARISC_UAC_SHIFT 0
	141	#define PARISC_UAC_MASK (PARISC_UAC_NOPRINT\|PARISC_UAC_SIGBUS)
	142
	143	#define SET_UNALIGN_CTL(task,value) \
	144	({ \
	145	(task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
	146	\| (((value) << PARISC_UAC_SHIFT) & \
	147	PARISC_UAC_MASK)); \
	148	0; \
	149	})
	150
	151	#define GET_UNALIGN_CTL(task,addr) \
	152	({ \
	153	put_user(((task)->thread.flags & PARISC_UAC_MASK) \
	154	>> PARISC_UAC_SHIFT, (int __user *) (addr)); \
	155	})
	156
1da177e4	157	#define INIT_THREAD { \
02d79800 AD	158	.regs = { .gr = { 0, }, \
	159	.fr = { 0, }, \
	160	.sr = { 0, }, \
	161	.iasq = { 0, }, \
	162	.iaoq = { 0, }, \
	163	.cr27 = 0, \
1da177e4	164	}, \
02d79800 AD	165	.task_size = DEFAULT_TASK_SIZE, \
	166	.map_base = DEFAULT_MAP_BASE, \
	167	.flags = 0 \
1da177e4 LT	168	}
	169
	170	/*
	171	* Return saved PC of a blocked thread. This is used by ps mostly.
	172	*/
	173
527dcdcc	174	struct task_struct;
1da177e4 LT	175	unsigned long thread_saved_pc(struct task_struct *t);
	176	void show_trace(struct task_struct task, unsigned long stack);
	177
	178	/*
	179	* Start user thread in another space.
	180	*
	181	* Note that we set both the iaoq and r31 to the new pc. When
	182	* the kernel initially calls execve it will return through an
	183	* rfi path that will use the values in the iaoq. The execve
	184	* syscall path will return through the gateway page, and
	185	* that uses r31 to branch to.
	186	*
	187	* For ELF we clear r23, because the dynamic linker uses it to pass
	188	* the address of the finalizer function.
	189	*
	190	* We also initialize sr3 to an illegal value (illegal for our
	191	* implementation, not for the architecture).
	192	*/
	193	typedef unsigned int elf_caddr_t;
	194
	195	#define start_thread_som(regs, new_pc, new_sp) do { \
	196	unsigned long sp = (unsigned long )new_sp; \
	197	__u32 spaceid = (__u32)current->mm->context; \
	198	unsigned long pc = (unsigned long)new_pc; \
	199	/* offset pc for priv. level */ \
	200	pc \|= 3; \
	201	\
1da177e4 LT	202	regs->iasq[0] = spaceid; \
	203	regs->iasq[1] = spaceid; \
	204	regs->iaoq[0] = pc; \
	205	regs->iaoq[1] = pc + 4; \
	206	regs->sr[2] = LINUX_GATEWAY_SPACE; \
	207	regs->sr[3] = 0xffff; \
	208	regs->sr[4] = spaceid; \
	209	regs->sr[5] = spaceid; \
	210	regs->sr[6] = spaceid; \
	211	regs->sr[7] = spaceid; \
	212	regs->gr[ 0] = USER_PSW; \
	213	regs->gr[30] = ((new_sp)+63)&~63; \
	214	regs->gr[31] = pc; \
	215	\
	216	get_user(regs->gr[26],&sp[0]); \
	217	get_user(regs->gr[25],&sp[-1]); \
	218	get_user(regs->gr[24],&sp[-2]); \
	219	get_user(regs->gr[23],&sp[-3]); \
	220	} while(0)
	221
	222	/* The ELF abi wants things done a "wee bit" differently than
	223	* som does. Supporting this behavior here avoids
	224	* having our own version of create_elf_tables.
	225	*
	226	* Oh, and yes, that is not a typo, we are really passing argc in r25
	227	* and argv in r24 (rather than r26 and r25). This is because that's
	228	* where __libc_start_main wants them.
	229	*
	230	* Duplicated from dl-machine.h for the benefit of readers:
	231	*
	232	* Our initial stack layout is rather different from everyone else's
	233	* due to the unique PA-RISC ABI. As far as I know it looks like
	234	* this:
	235
	236	----------------------------------- (user startup code creates this frame)
	237	\| 32 bytes of magic \|
	238	\|---------------------------------\|
	239	\| 32 bytes argument/sp save area \|
	240	\|---------------------------------\| (bprm->p)
	241	\| ELF auxiliary info \|
	242	\| (up to 28 words) \|
	243	\|---------------------------------\|
	244	\| NULL \|
	245	\|---------------------------------\|
	246	\| Environment pointers \|
	247	\|---------------------------------\|
	248	\| NULL \|
	249	\|---------------------------------\|
	250	\| Argument pointers \|
	251	\|---------------------------------\| <- argv
	252	\| argc (1 word) \|
	253	\|---------------------------------\| <- bprm->exec (HACK!)
	254	\| N bytes of slack \|
	255	\|---------------------------------\|
	256	\| filename passed to execve \|
	257	\|---------------------------------\| (mm->env_end)
	258	\| env strings \|
	259	\|---------------------------------\| (mm->env_start, mm->arg_end)
	260	\| arg strings \|
	261	\|---------------------------------\|
	262	\| additional faked arg strings if \|
	263	\| we're invoked via binfmt_script \|
	264	\|---------------------------------\| (mm->arg_start)
	265	stack base is at TASK_SIZE - rlim_max.
266
267	on downward growing arches, it looks like this:
268	stack base at TASK_SIZE
269	\| filename passed to execve
270	\| env strings
271	\| arg strings
272	\| faked arg strings
273	\| slack
274	\| ELF
275	\| envps
276	\| argvs
277	\| argc
278
279	* The pleasant part of this is that if we need to skip arguments we
280	* can just decrement argc and move argv, because the stack pointer
281	* is utterly unrelated to the location of the environment and
282	* argument vectors.
283	*
284	* Note that the S/390 people took the easy way out and hacked their
285	* GCC to make the stack grow downwards.
286	*
287	* Final Note: For entry from syscall, the W (wide) bit of the PSW
288	* is stuffed into the lowest bit of the user sp (%r30), so we fill
289	* it in here from the current->personality
290	*/
291
513e7ecd	292	#ifdef CONFIG_64BIT
df570b9c	293	#define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
1da177e4 LT	294	#else
	295	#define USER_WIDE_MODE 0
	296	#endif
	297
	298	#define start_thread(regs, new_pc, new_sp) do { \
	299	elf_addr_t sp = (elf_addr_t )new_sp; \
	300	__u32 spaceid = (__u32)current->mm->context; \
	301	elf_addr_t pc = (elf_addr_t)new_pc \| 3; \
	302	elf_caddr_t argv = (elf_caddr_t )bprm->exec + 1; \
	303	\
1da177e4 LT	304	regs->iasq[0] = spaceid; \
	305	regs->iasq[1] = spaceid; \
	306	regs->iaoq[0] = pc; \
	307	regs->iaoq[1] = pc + 4; \
	308	regs->sr[2] = LINUX_GATEWAY_SPACE; \
	309	regs->sr[3] = 0xffff; \
	310	regs->sr[4] = spaceid; \
	311	regs->sr[5] = spaceid; \
	312	regs->sr[6] = spaceid; \
	313	regs->sr[7] = spaceid; \
	314	regs->gr[ 0] = USER_PSW \| (USER_WIDE_MODE ? PSW_W : 0); \
	315	regs->fr[ 0] = 0LL; \
	316	regs->fr[ 1] = 0LL; \
	317	regs->fr[ 2] = 0LL; \
	318	regs->fr[ 3] = 0LL; \
	319	regs->gr[30] = (((unsigned long)sp + 63) &~ 63) \| (USER_WIDE_MODE ? 1 : 0); \
	320	regs->gr[31] = pc; \
	321	\
	322	get_user(regs->gr[25], (argv - 1)); \
	323	regs->gr[24] = (long) argv; \
	324	regs->gr[23] = 0; \
	325	} while(0)
	326
	327	struct task_struct;
	328	struct mm_struct;
	329
	330	/* Free all resources held by a thread. */
	331	extern void release_thread(struct task_struct *);
1da177e4	332
1da177e4 LT	333	extern void map_hpux_gateway_page(struct task_struct tsk, struct mm_struct mm);
	334
	335	extern unsigned long get_wchan(struct task_struct *p);
	336
	337	#define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
	338	#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
	339
1da177e4 LT	340	#define cpu_relax() barrier()
1da177e4 LT	341
20f4d3cb JB	342	/* Used as a macro to identify the combined VIPT/PIPT cached
	343	* CPUs which require a guarantee of coherency (no inequivalent
	344	* aliases with different data, whether clean or not) to operate */
	345	static inline int parisc_requires_coherency(void)
	346	{
	347	#ifdef CONFIG_PA8X00
2cbd42db KM	348	return (boot_cpu_data.cpu_type == mako) \|\|
2cbd42db KM	349	(boot_cpu_data.cpu_type == mako2);
20f4d3cb JB	350	#else
	351	return 0;
	352	#endif
	353	}
	354
1da177e4 LT	355	#endif /* __ASSEMBLY__ */
	356
	357	#endif /* __ASM_PARISC_PROCESSOR_H */