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/arch/mips/include/asm/thread_info.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C++ Header | 155 lines | 103 code | 23 blank | 29 comment | 2 complexity | 52debbf91cc7e761ac7cd0833051b34a MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  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
 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 */
 24struct 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 */
 28	unsigned long		tp_value;	/* thread pointer */
 29	__u32			cpu;		/* current CPU */
 30	int			preempt_count;	/* 0 => preemptable, <0 => BUG */
 31
 32	mm_segment_t		addr_limit;	/* thread address space:
 33						   0-0xBFFFFFFF for user-thead
 34						   0-0xFFFFFFFF for kernel-thread
 35						*/
 36	struct restart_block	restart_block;
 37	struct pt_regs		*regs;
 38};
 39
 40/*
 41 * macros/functions for gaining access to the thread information structure
 42 */
 43#define INIT_THREAD_INFO(tsk)			\
 44{						\
 45	.task		= &tsk,			\
 46	.exec_domain	= &default_exec_domain,	\
 47	.flags		= _TIF_FIXADE,		\
 48	.cpu		= 0,			\
 49	.preempt_count	= INIT_PREEMPT_COUNT,	\
 50	.addr_limit	= KERNEL_DS,		\
 51	.restart_block	= {			\
 52		.fn = do_no_restart_syscall,	\
 53	},					\
 54}
 55
 56#define init_thread_info	(init_thread_union.thread_info)
 57#define init_stack		(init_thread_union.stack)
 58
 59/* How to get the thread information struct from C.  */
 60register struct thread_info *__current_thread_info __asm__("$28");
 61#define current_thread_info()  __current_thread_info
 62
 63/* thread information allocation */
 64#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
 65#define THREAD_SIZE_ORDER (1)
 66#endif
 67#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
 68#define THREAD_SIZE_ORDER (2)
 69#endif
 70#ifdef CONFIG_PAGE_SIZE_8KB
 71#define THREAD_SIZE_ORDER (1)
 72#endif
 73#ifdef CONFIG_PAGE_SIZE_16KB
 74#define THREAD_SIZE_ORDER (0)
 75#endif
 76#ifdef CONFIG_PAGE_SIZE_32KB
 77#define THREAD_SIZE_ORDER (0)
 78#endif
 79#ifdef CONFIG_PAGE_SIZE_64KB
 80#define THREAD_SIZE_ORDER (0)
 81#endif
 82
 83#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
 84#define THREAD_MASK (THREAD_SIZE - 1UL)
 85
 86#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
 87
 88#ifdef CONFIG_DEBUG_STACK_USAGE
 89#define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL)
 90#else
 91#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
 92#endif
 93
 94#define free_thread_info(info) kfree(info)
 95
 96#endif /* !__ASSEMBLY__ */
 97
 98#define PREEMPT_ACTIVE		0x10000000
 99
100/*
101 * thread information flags
102 * - these are process state flags that various assembly files may need to
103 *   access
104 * - pending work-to-be-done flags are in LSW
105 * - other flags in MSW
106 */
107#define TIF_SIGPENDING		1	/* signal pending */
108#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
109#define TIF_SYSCALL_AUDIT	3	/* syscall auditing active */
110#define TIF_SECCOMP		4	/* secure computing */
111#define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
112#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
113#define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
114#define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
115#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
116#define TIF_FREEZE		19
117#define TIF_FIXADE		20	/* Fix address errors in software */
118#define TIF_LOGADE		21	/* Log address errors to syslog */
119#define TIF_32BIT_REGS		22	/* also implies 16/32 fprs */
120#define TIF_32BIT_ADDR		23	/* 32-bit address space (o32/n32) */
121#define TIF_FPUBOUND		24	/* thread bound to FPU-full CPU set */
122#define TIF_LOAD_WATCH		25	/* If set, load watch registers */
123#define TIF_SYSCALL_TRACE	31	/* syscall trace active */
124
125#ifdef CONFIG_MIPS32_O32
126#define TIF_32BIT TIF_32BIT_REGS
127#elif defined(CONFIG_MIPS32_N32)
128#define TIF_32BIT _TIF_32BIT_ADDR
129#endif /* CONFIG_MIPS32_O32 */
130
131#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
132#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
133#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
134#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
135#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
136#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
137#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
138#define _TIF_USEDFPU		(1<<TIF_USEDFPU)
139#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
140#define _TIF_FREEZE		(1<<TIF_FREEZE)
141#define _TIF_FIXADE		(1<<TIF_FIXADE)
142#define _TIF_LOGADE		(1<<TIF_LOGADE)
143#define _TIF_32BIT_REGS		(1<<TIF_32BIT_REGS)
144#define _TIF_32BIT_ADDR		(1<<TIF_32BIT_ADDR)
145#define _TIF_FPUBOUND		(1<<TIF_FPUBOUND)
146#define _TIF_LOAD_WATCH		(1<<TIF_LOAD_WATCH)
147
148/* work to do on interrupt/exception return */
149#define _TIF_WORK_MASK		(0x0000ffef & ~_TIF_SECCOMP)
150/* work to do on any return to u-space */
151#define _TIF_ALLWORK_MASK	(0x8000ffff & ~_TIF_SECCOMP)
152
153#endif /* __KERNEL__ */
154
155#endif /* _ASM_THREAD_INFO_H */