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
15 #include <asm/processor.h>
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
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 */
32 mm_segment_t addr_limit; /* thread address space:
33 0-0xBFFFFFFF for user-thead
34 0-0xFFFFFFFF for kernel-thread
36 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, \
49 .flags = _TIF_FIXADE, \
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 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
87 #ifdef CONFIG_DEBUG_STACK_USAGE
88 #define alloc_thread_info(tsk) \
90 struct thread_info *ret; \
92 ret = kzalloc(THREAD_SIZE, GFP_KERNEL); \
97 #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
100 #define free_thread_info(info) kfree(info)
102 #endif /* !__ASSEMBLY__ */
104 #define PREEMPT_ACTIVE 0x10000000
107 * thread information flags
108 * - these are process state flags that various assembly files may need to
110 * - pending work-to-be-done flags are in LSW
111 * - other flags in MSW
113 #define TIF_SIGPENDING 1 /* signal pending */
114 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
115 #define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
116 #define TIF_SECCOMP 4 /* secure computing */
117 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
118 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
119 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
120 #define TIF_MEMDIE 18
121 #define TIF_FREEZE 19
122 #define TIF_FIXADE 20 /* Fix address errors in software */
123 #define TIF_LOGADE 21 /* Log address errors to syslog */
124 #define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */
125 #define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
126 #define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
127 #define TIF_SYSCALL_TRACE 31 /* syscall trace active */
129 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
130 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
131 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
132 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
133 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
134 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
135 #define _TIF_USEDFPU (1<<TIF_USEDFPU)
136 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
137 #define _TIF_FREEZE (1<<TIF_FREEZE)
138 #define _TIF_FIXADE (1<<TIF_FIXADE)
139 #define _TIF_LOGADE (1<<TIF_LOGADE)
140 #define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
141 #define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
142 #define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
144 /* work to do on interrupt/exception return */
145 #define _TIF_WORK_MASK (0x0000ffef & ~_TIF_SECCOMP)
146 /* work to do on any return to u-space */
147 #define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP)
149 #endif /* __KERNEL__ */
151 #endif /* _ASM_THREAD_INFO_H */