[net-next-2.6.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/system.h>
#include <asm/percpu.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_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

#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 */
	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;
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.
 */

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 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;	\
							\
	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
	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>
	19	#include <asm/system.h>
ef017beb	20	#include <asm/percpu.h>
abf1e11a	21
1da177e4 LT	22	#endif /* __ASSEMBLY__ */
	23
	24	#define KERNEL_STACK_SIZE (4*PAGE_SIZE)
	25
	26	/*
	27	* Default implementation of macro that returns current
	28	* instruction pointer ("program counter").
	29	*/
1b6d1b5e KM	30	#ifdef CONFIG_PA20
	31	#define current_ia(x) __asm__("mfia %0" : "=r"(x))
	32	#else /* mfia added in pa2.0 */
	33	#define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x))
	34	#endif
	35	#define current_text_addr() ({ void *pc; current_ia(pc); pc; })
1da177e4	36
82455257 DH	37	#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size)
82455257 DH	38	#define TASK_SIZE TASK_SIZE_OF(current)
1da177e4 LT	39	#define TASK_UNMAPPED_BASE (current->thread.map_base)
	40
	41	#define DEFAULT_TASK_SIZE32 (0xFFF00000UL)
	42	#define DEFAULT_MAP_BASE32 (0x40000000UL)
	43
513e7ecd	44	#ifdef CONFIG_64BIT
1da177e4 LT	45	#define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000)
	46	#define DEFAULT_MAP_BASE (0x200000000UL)
	47	#else
	48	#define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32
	49	#define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32
	50	#endif
	51
922a70d3 DH	52	#ifdef __KERNEL__
	53
	54	/* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
	55	* prumpf */
	56
	57	#define STACK_TOP TASK_SIZE
	58	#define STACK_TOP_MAX DEFAULT_TASK_SIZE
	59
	60	#endif
	61
1da177e4 LT	62	#ifndef __ASSEMBLY__
	63
	64	/*
	65	* Data detected about CPUs at boot time which is the same for all CPU's.
	66	* HP boxes are SMP - ie identical processors.
	67	*
	68	* FIXME: some CPU rev info may be processor specific...
	69	*/
	70	struct system_cpuinfo_parisc {
	71	unsigned int cpu_count;
	72	unsigned int cpu_hz;
	73	unsigned int hversion;
	74	unsigned int sversion;
	75	enum cpu_type cpu_type;
	76
	77	struct {
	78	struct pdc_model model;
	79	unsigned long versions;
	80	unsigned long cpuid;
	81	unsigned long capabilities;
	82	char sys_model_name[81]; /* PDC-ROM returnes this model name */
	83	} pdc;
	84
e9541d0c HD	85	const char cpu_name; / e.g. "PA7300LC (PCX-L2)" */
e9541d0c HD	86	const char family_name; / e.g. "1.1e" */
1da177e4 LT	87	};
	88
	89
	90	/* Per CPU data structure - ie varies per CPU. */
	91	struct cpuinfo_parisc {
	92	unsigned long it_value; /* Interval Timer at last timer Intr */
	93	unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */
	94	unsigned long irq_count; /* number of IRQ's since boot */
	95	unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
	96	unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */
	97	unsigned long hpa; /* Host Physical address */
	98	unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
	99	#ifdef CONFIG_SMP
1da177e4 LT	100	unsigned long pending_ipi; /* bitmap of type ipi_message_type */
	101	unsigned long ipi_count; /* number ipi Interrupts */
	102	#endif
	103	unsigned long bh_count; /* number of times bh was invoked */
	104	unsigned long prof_counter; /* per CPU profiling support */
	105	unsigned long prof_multiplier; /* per CPU profiling support */
	106	unsigned long fp_rev;
	107	unsigned long fp_model;
	108	unsigned int state;
	109	struct parisc_device *dev;
	110	unsigned long loops_per_jiffy;
	111	};
	112
	113	extern struct system_cpuinfo_parisc boot_cpu_data;
ef017beb	114	DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
1da177e4 LT	115
	116	#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
	117
	118	typedef struct {
	119	int seg;
	120	} mm_segment_t;
	121
	122	#define ARCH_MIN_TASKALIGN 8
	123
	124	struct thread_struct {
	125	struct pt_regs regs;
	126	unsigned long task_size;
	127	unsigned long map_base;
	128	unsigned long flags;
	129	};
	130
abf1e11a KM	131	#define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
abf1e11a KM	132
1da177e4	133	/* Thread struct flags. */
f053725b KM	134	#define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */
f053725b KM	135	#define PARISC_UAC_SIGBUS (1UL << 1)
1da177e4 LT	136	#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */
1da177e4 LT	137
f053725b KM	138	#define PARISC_UAC_SHIFT 0
	139	#define PARISC_UAC_MASK (PARISC_UAC_NOPRINT\|PARISC_UAC_SIGBUS)
	140
	141	#define SET_UNALIGN_CTL(task,value) \
	142	({ \
	143	(task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
	144	\| (((value) << PARISC_UAC_SHIFT) & \
	145	PARISC_UAC_MASK)); \
	146	0; \
	147	})
	148
	149	#define GET_UNALIGN_CTL(task,addr) \
	150	({ \
	151	put_user(((task)->thread.flags & PARISC_UAC_MASK) \
	152	>> PARISC_UAC_SHIFT, (int __user *) (addr)); \
	153	})
	154
1da177e4	155	#define INIT_THREAD { \
02d79800 AD	156	.regs = { .gr = { 0, }, \
	157	.fr = { 0, }, \
	158	.sr = { 0, }, \
	159	.iasq = { 0, }, \
	160	.iaoq = { 0, }, \
	161	.cr27 = 0, \
1da177e4	162	}, \
02d79800 AD	163	.task_size = DEFAULT_TASK_SIZE, \
	164	.map_base = DEFAULT_MAP_BASE, \
	165	.flags = 0 \
1da177e4 LT	166	}
	167
	168	/*
	169	* Return saved PC of a blocked thread. This is used by ps mostly.
	170	*/
	171
	172	unsigned long thread_saved_pc(struct task_struct *t);
	173	void show_trace(struct task_struct task, unsigned long stack);
	174
	175	/*
	176	* Start user thread in another space.
	177	*
	178	* Note that we set both the iaoq and r31 to the new pc. When
	179	* the kernel initially calls execve it will return through an
	180	* rfi path that will use the values in the iaoq. The execve
	181	* syscall path will return through the gateway page, and
	182	* that uses r31 to branch to.
	183	*
	184	* For ELF we clear r23, because the dynamic linker uses it to pass
	185	* the address of the finalizer function.
	186	*
	187	* We also initialize sr3 to an illegal value (illegal for our
	188	* implementation, not for the architecture).
	189	*/
	190	typedef unsigned int elf_caddr_t;
	191
	192	#define start_thread_som(regs, new_pc, new_sp) do { \
	193	unsigned long sp = (unsigned long )new_sp; \
	194	__u32 spaceid = (__u32)current->mm->context; \
	195	unsigned long pc = (unsigned long)new_pc; \
	196	/* offset pc for priv. level */ \
	197	pc \|= 3; \
	198	\
	199	set_fs(USER_DS); \
	200	regs->iasq[0] = spaceid; \
	201	regs->iasq[1] = spaceid; \
	202	regs->iaoq[0] = pc; \
	203	regs->iaoq[1] = pc + 4; \
	204	regs->sr[2] = LINUX_GATEWAY_SPACE; \
	205	regs->sr[3] = 0xffff; \
	206	regs->sr[4] = spaceid; \
	207	regs->sr[5] = spaceid; \
	208	regs->sr[6] = spaceid; \
	209	regs->sr[7] = spaceid; \
	210	regs->gr[ 0] = USER_PSW; \
	211	regs->gr[30] = ((new_sp)+63)&~63; \
	212	regs->gr[31] = pc; \
	213	\
	214	get_user(regs->gr[26],&sp[0]); \
	215	get_user(regs->gr[25],&sp[-1]); \
	216	get_user(regs->gr[24],&sp[-2]); \
	217	get_user(regs->gr[23],&sp[-3]); \
	218	} while(0)
	219
	220	/* The ELF abi wants things done a "wee bit" differently than
	221	* som does. Supporting this behavior here avoids
	222	* having our own version of create_elf_tables.
	223	*
	224	* Oh, and yes, that is not a typo, we are really passing argc in r25
	225	* and argv in r24 (rather than r26 and r25). This is because that's
	226	* where __libc_start_main wants them.
	227	*
	228	* Duplicated from dl-machine.h for the benefit of readers:
	229	*
230	* Our initial stack layout is rather different from everyone else's
231	* due to the unique PA-RISC ABI. As far as I know it looks like
232	* this:
233
234	----------------------------------- (user startup code creates this frame)
235	\| 32 bytes of magic \|
236	\|---------------------------------\|
237	\| 32 bytes argument/sp save area \|
238	\|---------------------------------\| (bprm->p)
239	\| ELF auxiliary info \|
240	\| (up to 28 words) \|
241	\|---------------------------------\|
242	\| NULL \|
243	\|---------------------------------\|
244	\| Environment pointers \|
245	\|---------------------------------\|
246	\| NULL \|
247	\|---------------------------------\|
248	\| Argument pointers \|
249	\|---------------------------------\| <- argv
250	\| argc (1 word) \|
251	\|---------------------------------\| <- bprm->exec (HACK!)
252	\| N bytes of slack \|
253	\|---------------------------------\|
254	\| filename passed to execve \|
255	\|---------------------------------\| (mm->env_end)
256	\| env strings \|
257	\|---------------------------------\| (mm->env_start, mm->arg_end)
258	\| arg strings \|
259	\|---------------------------------\|
260	\| additional faked arg strings if \|
261	\| we're invoked via binfmt_script \|
262	\|---------------------------------\| (mm->arg_start)
263	stack base is at TASK_SIZE - rlim_max.
264
265	on downward growing arches, it looks like this:
266	stack base at TASK_SIZE
267	\| filename passed to execve
268	\| env strings
269	\| arg strings
270	\| faked arg strings
271	\| slack
272	\| ELF
273	\| envps
274	\| argvs
275	\| argc
276
277	* The pleasant part of this is that if we need to skip arguments we
278	* can just decrement argc and move argv, because the stack pointer
279	* is utterly unrelated to the location of the environment and
280	* argument vectors.
281	*
282	* Note that the S/390 people took the easy way out and hacked their
283	* GCC to make the stack grow downwards.
284	*
285	* Final Note: For entry from syscall, the W (wide) bit of the PSW
286	* is stuffed into the lowest bit of the user sp (%r30), so we fill
287	* it in here from the current->personality
288	*/
289
513e7ecd	290	#ifdef CONFIG_64BIT
df570b9c	291	#define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
1da177e4 LT	292	#else
	293	#define USER_WIDE_MODE 0
	294	#endif
	295
	296	#define start_thread(regs, new_pc, new_sp) do { \
	297	elf_addr_t sp = (elf_addr_t )new_sp; \
	298	__u32 spaceid = (__u32)current->mm->context; \
	299	elf_addr_t pc = (elf_addr_t)new_pc \| 3; \
	300	elf_caddr_t argv = (elf_caddr_t )bprm->exec + 1; \
	301	\
	302	set_fs(USER_DS); \
	303	regs->iasq[0] = spaceid; \
	304	regs->iasq[1] = spaceid; \
	305	regs->iaoq[0] = pc; \
	306	regs->iaoq[1] = pc + 4; \
	307	regs->sr[2] = LINUX_GATEWAY_SPACE; \
	308	regs->sr[3] = 0xffff; \
	309	regs->sr[4] = spaceid; \
	310	regs->sr[5] = spaceid; \
	311	regs->sr[6] = spaceid; \
	312	regs->sr[7] = spaceid; \
	313	regs->gr[ 0] = USER_PSW \| (USER_WIDE_MODE ? PSW_W : 0); \
	314	regs->fr[ 0] = 0LL; \
	315	regs->fr[ 1] = 0LL; \
	316	regs->fr[ 2] = 0LL; \
	317	regs->fr[ 3] = 0LL; \
	318	regs->gr[30] = (((unsigned long)sp + 63) &~ 63) \| (USER_WIDE_MODE ? 1 : 0); \
	319	regs->gr[31] = pc; \
	320	\
	321	get_user(regs->gr[25], (argv - 1)); \
	322	regs->gr[24] = (long) argv; \
	323	regs->gr[23] = 0; \
	324	} while(0)
	325
	326	struct task_struct;
	327	struct mm_struct;
	328
	329	/* Free all resources held by a thread. */
	330	extern void release_thread(struct task_struct *);
	331	extern int kernel_thread(int (fn)(void ), void * arg, unsigned long flags);
	332
	333	/* Prepare to copy thread state - unlazy all lazy status */
	334	#define prepare_to_copy(tsk) do { } while (0)
	335
	336	extern void map_hpux_gateway_page(struct task_struct tsk, struct mm_struct mm);
	337
	338	extern unsigned long get_wchan(struct task_struct *p);
	339
	340	#define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
	341	#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
	342
1da177e4 LT	343	#define cpu_relax() barrier()
1da177e4 LT	344
20f4d3cb JB	345	/* Used as a macro to identify the combined VIPT/PIPT cached
	346	* CPUs which require a guarantee of coherency (no inequivalent
	347	* aliases with different data, whether clean or not) to operate */
	348	static inline int parisc_requires_coherency(void)
	349	{
	350	#ifdef CONFIG_PA8X00
2cbd42db KM	351	return (boot_cpu_data.cpu_type == mako) \|\|
2cbd42db KM	352	(boot_cpu_data.cpu_type == mako2);
20f4d3cb JB	353	#else
	354	return 0;
	355	#endif
	356	}
	357
1da177e4 LT	358	#endif /* __ASSEMBLY__ */
	359
	360	#endif /* __ASM_PARISC_PROCESSOR_H */