1 /* thread_info.h: MIPS low-level thread information
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
7 #ifndef _ASM_THREAD_INFO_H
8 #define _ASM_THREAD_INFO_H
12 #include <linux/config.h>
16 #include <asm/processor.h>
19 * low level task data that entry.S needs immediate access to
20 * - this struct should fit entirely inside of one cache line
21 * - this struct shares the supervisor stack pages
22 * - if the contents of this structure are changed, the assembly constants
23 * must also be changed
26 struct task_struct
*task
; /* main task structure */
27 struct exec_domain
*exec_domain
; /* execution domain */
28 unsigned long flags
; /* low level flags */
29 unsigned long tp_value
; /* thread pointer */
30 __u32 cpu
; /* current CPU */
31 int preempt_count
; /* 0 => preemptable, <0 => BUG */
33 mm_segment_t addr_limit
; /* thread address space:
34 0-0xBFFFFFFF for user-thead
35 0-0xFFFFFFFF for kernel-thread
37 struct restart_block restart_block
;
41 * macros/functions for gaining access to the thread information structure
43 * preempt_count needs to be 1 initially, until the scheduler is functional.
45 #define INIT_THREAD_INFO(tsk) \
48 .exec_domain = &default_exec_domain, \
52 .addr_limit = KERNEL_DS, \
54 .fn = do_no_restart_syscall, \
58 #define init_thread_info (init_thread_union.thread_info)
59 #define init_stack (init_thread_union.stack)
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
65 /* thread information allocation */
66 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
67 #define THREAD_SIZE_ORDER (1)
69 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
70 #define THREAD_SIZE_ORDER (2)
72 #ifdef CONFIG_PAGE_SIZE_8KB
73 #define THREAD_SIZE_ORDER (1)
75 #ifdef CONFIG_PAGE_SIZE_16KB
76 #define THREAD_SIZE_ORDER (0)
78 #ifdef CONFIG_PAGE_SIZE_64KB
79 #define THREAD_SIZE_ORDER (0)
82 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
83 #define THREAD_MASK (THREAD_SIZE - 1UL)
85 #ifdef CONFIG_DEBUG_STACK_USAGE
86 #define alloc_thread_info(tsk) \
88 struct thread_info *ret; \
90 ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
92 memset(ret, 0, THREAD_SIZE); \
96 #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
99 #define free_thread_info(info) kfree(info)
100 #define get_thread_info(ti) get_task_struct((ti)->task)
101 #define put_thread_info(ti) put_task_struct((ti)->task)
103 #endif /* !__ASSEMBLY__ */
105 #define PREEMPT_ACTIVE 0x10000000
108 * thread information flags
109 * - these are process state flags that various assembly files may need to
111 * - pending work-to-be-done flags are in LSW
112 * - other flags in MSW
114 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
115 #define TIF_SIGPENDING 2 /* signal pending */
116 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
117 #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
118 #define TIF_SECCOMP 5 /* secure computing */
119 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
120 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
121 #define TIF_MEMDIE 18
122 #define TIF_SYSCALL_TRACE 31 /* syscall trace active */
124 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
125 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
126 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
127 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
128 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
129 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
130 #define _TIF_USEDFPU (1<<TIF_USEDFPU)
131 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
133 /* work to do on interrupt/exception return */
134 #define _TIF_WORK_MASK (0x0000ffef & ~_TIF_SECCOMP)
135 /* work to do on any return to u-space */
136 #define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP)
138 #endif /* __KERNEL__ */
140 #endif /* _ASM_THREAD_INFO_H */