[linux-2.6-block.git] / arch / mips / include / asm / thread_info.h

/* thread_info.h: MIPS low-level thread information
 *
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__


#ifndef __ASSEMBLY__

#include <asm/processor.h>

/*
 * low level task data that entry.S needs immediate access to
 * - this struct should fit entirely inside of one cache line
 * - this struct shares the supervisor stack pages
 * - if the contents of this structure are changed, the assembly constants
 *   must also be changed
 */
struct thread_info {
	struct task_struct	*task;		/* main task structure */
	struct exec_domain	*exec_domain;	/* execution domain */
	unsigned long		flags;		/* low level flags */
	unsigned long		tp_value;	/* thread pointer */
	__u32			cpu;		/* current CPU */
	int			preempt_count;	/* 0 => preemptable, <0 => BUG */

	mm_segment_t		addr_limit;	/* thread address space:
						   0-0xBFFFFFFF for user-thead
						   0-0xFFFFFFFF for kernel-thread
						*/
	struct restart_block	restart_block;
	struct pt_regs		*regs;
};

/*
 * macros/functions for gaining access to the thread information structure
 *
 * preempt_count needs to be 1 initially, until the scheduler is functional.
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.flags		= _TIF_FIXADE,		\
	.cpu		= 0,			\
	.preempt_count	= 1,			\
	.addr_limit	= KERNEL_DS,		\
	.restart_block	= {			\
		.fn = do_no_restart_syscall,	\
	},					\
}

#define init_thread_info	(init_thread_union.thread_info)
#define init_stack		(init_thread_union.stack)

/* How to get the thread information struct from C.  */
register struct thread_info *__current_thread_info __asm__("$28");
#define current_thread_info()  __current_thread_info

/* thread information allocation */
#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
#define THREAD_SIZE_ORDER (1)
#endif
#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
#define THREAD_SIZE_ORDER (2)
#endif
#ifdef CONFIG_PAGE_SIZE_8KB
#define THREAD_SIZE_ORDER (1)
#endif
#ifdef CONFIG_PAGE_SIZE_16KB
#define THREAD_SIZE_ORDER (0)
#endif
#ifdef CONFIG_PAGE_SIZE_32KB
#define THREAD_SIZE_ORDER (0)
#endif
#ifdef CONFIG_PAGE_SIZE_64KB
#define THREAD_SIZE_ORDER (0)
#endif

#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
#define THREAD_MASK (THREAD_SIZE - 1UL)

#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

#ifdef CONFIG_DEBUG_STACK_USAGE
#define alloc_thread_info(tsk)					\
({								\
	struct thread_info *ret;				\
								\
	ret = kzalloc(THREAD_SIZE, GFP_KERNEL);			\
								\
	ret;							\
})
#else
#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
#endif

#define free_thread_info(info) kfree(info)

#endif /* !__ASSEMBLY__ */

#define PREEMPT_ACTIVE		0x10000000

/*
 * thread information flags
 * - these are process state flags that various assembly files may need to
 *   access
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */
#define TIF_SIGPENDING		1	/* signal pending */
#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
#define TIF_SYSCALL_AUDIT	3	/* syscall auditing active */
#define TIF_SECCOMP		4	/* secure computing */
#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
#define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE		18
#define TIF_FREEZE		19
#define TIF_FIXADE		20	/* Fix address errors in software */
#define TIF_LOGADE		21	/* Log address errors to syslog */
#define TIF_32BIT_REGS		22	/* also implies 16/32 fprs */
#define TIF_32BIT_ADDR		23	/* 32-bit address space (o32/n32) */
#define TIF_FPUBOUND		24	/* thread bound to FPU-full CPU set */
#define TIF_LOAD_WATCH		25	/* If set, load watch registers */
#define TIF_SYSCALL_TRACE	31	/* syscall trace active */

#ifdef CONFIG_MIPS32_O32
#define TIF_32BIT TIF_32BIT_REGS
#elif defined(CONFIG_MIPS32_N32)
#define TIF_32BIT _TIF_32BIT_ADDR
#endif /* CONFIG_MIPS32_O32 */

#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
#define _TIF_USEDFPU		(1<<TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
#define _TIF_FREEZE		(1<<TIF_FREEZE)
#define _TIF_FIXADE		(1<<TIF_FIXADE)
#define _TIF_LOGADE		(1<<TIF_LOGADE)
#define _TIF_32BIT_REGS		(1<<TIF_32BIT_REGS)
#define _TIF_32BIT_ADDR		(1<<TIF_32BIT_ADDR)
#define _TIF_FPUBOUND		(1<<TIF_FPUBOUND)
#define _TIF_LOAD_WATCH		(1<<TIF_LOAD_WATCH)

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK		(0x0000ffef & ~_TIF_SECCOMP)
/* work to do on any return to u-space */
#define _TIF_ALLWORK_MASK	(0x8000ffff & ~_TIF_SECCOMP)

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */
Commit	Line	Data
1da177e4 LT	1	/* thread_info.h: MIPS low-level thread information
	2	*
	3	* Copyright (C) 2002 David Howells (dhowells@redhat.com)
	4	* - Incorporating suggestions made by Linus Torvalds and Dave Miller
	5	*/
	6
	7	#ifndef _ASM_THREAD_INFO_H
	8	#define _ASM_THREAD_INFO_H
	9
	10	#ifdef __KERNEL__
	11
1da177e4 LT	12
	13	#ifndef __ASSEMBLY__
	14
	15	#include <asm/processor.h>
	16
	17	/*
	18	* low level task data that entry.S needs immediate access to
	19	* - this struct should fit entirely inside of one cache line
	20	* - this struct shares the supervisor stack pages
	21	* - if the contents of this structure are changed, the assembly constants
	22	* must also be changed
	23	*/
	24	struct thread_info {
	25	struct task_struct task; / main task structure */
	26	struct exec_domain exec_domain; / execution domain */
	27	unsigned long flags; /* low level flags */
3c37026d	28	unsigned long tp_value; /* thread pointer */
1da177e4	29	__u32 cpu; /* current CPU */
dcd497f9	30	int preempt_count; /* 0 => preemptable, <0 => BUG */
1da177e4 LT	31
1da177e4 LT	32	mm_segment_t addr_limit; /* thread address space:
a3dddd56	33	0-0xBFFFFFFF for user-thead
1da177e4 LT	34	0-0xFFFFFFFF for kernel-thread
	35	*/
	36	struct restart_block restart_block;
937a8015	37	struct pt_regs *regs;
1da177e4 LT	38	};
	39
	40	/*
	41	* macros/functions for gaining access to the thread information structure
	42	*
	43	* preempt_count needs to be 1 initially, until the scheduler is functional.
	44	*/
	45	#define INIT_THREAD_INFO(tsk) \
	46	{ \
	47	.task = &tsk, \
	48	.exec_domain = &default_exec_domain, \
293c5bd1	49	.flags = _TIF_FIXADE, \
1da177e4 LT	50	.cpu = 0, \
	51	.preempt_count = 1, \
	52	.addr_limit = KERNEL_DS, \
	53	.restart_block = { \
	54	.fn = do_no_restart_syscall, \
	55	}, \
	56	}
	57
	58	#define init_thread_info (init_thread_union.thread_info)
	59	#define init_stack (init_thread_union.stack)
	60
	61	/* How to get the thread information struct from C. */
	62	register struct thread_info *__current_thread_info __asm__("$28");
	63	#define current_thread_info() __current_thread_info
	64
	65	/* thread information allocation */
875d43e7	66	#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
1da177e4 LT	67	#define THREAD_SIZE_ORDER (1)
1da177e4 LT	68	#endif
875d43e7	69	#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
1da177e4 LT	70	#define THREAD_SIZE_ORDER (2)
	71	#endif
	72	#ifdef CONFIG_PAGE_SIZE_8KB
	73	#define THREAD_SIZE_ORDER (1)
	74	#endif
	75	#ifdef CONFIG_PAGE_SIZE_16KB
	76	#define THREAD_SIZE_ORDER (0)
	77	#endif
c52399be RB	78	#ifdef CONFIG_PAGE_SIZE_32KB
	79	#define THREAD_SIZE_ORDER (0)
	80	#endif
1da177e4 LT	81	#ifdef CONFIG_PAGE_SIZE_64KB
	82	#define THREAD_SIZE_ORDER (0)
	83	#endif
	84
	85	#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
	86	#define THREAD_MASK (THREAD_SIZE - 1UL)
	87
b69c49b7 FT	88	#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
b69c49b7 FT	89
1da177e4 LT	90	#ifdef CONFIG_DEBUG_STACK_USAGE
	91	#define alloc_thread_info(tsk) \
	92	({ \
	93	struct thread_info *ret; \
	94	\
185bcd17 MK	95	ret = kzalloc(THREAD_SIZE, GFP_KERNEL); \
185bcd17 MK	96	\
1da177e4 LT	97	ret; \
	98	})
	99	#else
	100	#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
	101	#endif
	102
	103	#define free_thread_info(info) kfree(info)
1da177e4 LT	104
	105	#endif /* !__ASSEMBLY__ */
	106
	107	#define PREEMPT_ACTIVE 0x10000000
	108
	109	/*
	110	* thread information flags
	111	* - these are process state flags that various assembly files may need to
	112	* access
	113	* - pending work-to-be-done flags are in LSW
	114	* - other flags in MSW
	115	*/
a583f1b5 SE	116	#define TIF_SIGPENDING 1 /* signal pending */
	117	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	118	#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
	119	#define TIF_SECCOMP 4 /* secure computing */
7b3e2fc8	120	#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
1da177e4 LT	121	#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
	122	#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
	123	#define TIF_MEMDIE 18
89c07fd1	124	#define TIF_FREEZE 19
293c5bd1 RB	125	#define TIF_FIXADE 20 /* Fix address errors in software */
	126	#define TIF_LOGADE 21 /* Log address errors to syslog */
	127	#define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */
	128	#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
	129	#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
6aa3524c	130	#define TIF_LOAD_WATCH 25 /* If set, load watch registers */
1da177e4 LT	131	#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
1da177e4 LT	132
3b289d6e ZL	133	#ifdef CONFIG_MIPS32_O32
	134	#define TIF_32BIT TIF_32BIT_REGS
	135	#elif defined(CONFIG_MIPS32_N32)
	136	#define TIF_32BIT _TIF_32BIT_ADDR
	137	#endif /* CONFIG_MIPS32_O32 */
	138
1da177e4	139	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
1da177e4 LT	140	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	141	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	142	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
127c6f66	143	#define _TIF_SECCOMP (1<<TIF_SECCOMP)
7b3e2fc8	144	#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
1da177e4 LT	145	#define _TIF_USEDFPU (1<<TIF_USEDFPU)
1da177e4 LT	146	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
89c07fd1	147	#define _TIF_FREEZE (1<<TIF_FREEZE)
293c5bd1 RB	148	#define _TIF_FIXADE (1<<TIF_FIXADE)
	149	#define _TIF_LOGADE (1<<TIF_LOGADE)
	150	#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
	151	#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
	152	#define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
6aa3524c	153	#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
1da177e4	154
127c6f66 RB	155	/* work to do on interrupt/exception return */
	156	#define _TIF_WORK_MASK (0x0000ffef & ~_TIF_SECCOMP)
	157	/* work to do on any return to u-space */
	158	#define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP)
1da177e4 LT	159
	160	#endif /* __KERNEL__ */
	161
	162	#endif /* _ASM_THREAD_INFO_H */