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1#ifndef __ASM_SH_THREAD_INFO_H
2#define __ASM_SH_THREAD_INFO_H
3
4/* SuperH version
5 * Copyright (C) 2002 Niibe Yutaka
6 *
7 * The copyright of original i386 version is:
8 *
9 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
10 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
11 */
12#ifdef __KERNEL__
13#include <asm/page.h>
14
15#ifndef __ASSEMBLY__
16#include <asm/processor.h>
17
18struct thread_info {
19 struct task_struct *task; /* main task structure */
20 struct exec_domain *exec_domain; /* execution domain */
21 unsigned long flags; /* low level flags */
22 __u32 cpu;
23 int preempt_count; /* 0 => preemptable, <0 => BUG */
24 mm_segment_t addr_limit; /* thread address space */
25 struct restart_block restart_block;
26 unsigned long previous_sp; /* sp of previous stack in case
27 of nested IRQ stacks */
28 __u8 supervisor_stack[0];
29};
30
31#endif
32
33#define PREEMPT_ACTIVE 0x10000000
34
35#ifdef CONFIG_4KSTACKS
36#define THREAD_SIZE (PAGE_SIZE)
37#else
38#define THREAD_SIZE (PAGE_SIZE * 2)
39#endif
40#define STACK_WARN (THREAD_SIZE / 8)
41
42/*
43 * macros/functions for gaining access to the thread information structure
44 */
45#ifndef __ASSEMBLY__
46#define INIT_THREAD_INFO(tsk) \
47{ \
48 .task = &tsk, \
49 .exec_domain = &default_exec_domain, \
50 .flags = 0, \
51 .cpu = 0, \
52 .preempt_count = 1, \
53 .addr_limit = KERNEL_DS, \
54 .restart_block = { \
55 .fn = do_no_restart_syscall, \
56 }, \
57}
58
59#define init_thread_info (init_thread_union.thread_info)
60#define init_stack (init_thread_union.stack)
61
62/* how to get the current stack pointer from C */
63register unsigned long current_stack_pointer asm("r15") __attribute_used__;
64
65/* how to get the thread information struct from C */
66static inline struct thread_info *current_thread_info(void)
67{
68 struct thread_info *ti;
69#ifdef CONFIG_CPU_HAS_SR_RB
70 __asm__("stc r7_bank, %0" : "=r" (ti));
71#else
72 unsigned long __dummy;
73
74 __asm__ __volatile__ (
75 "mov r15, %0\n\t"
76 "and %1, %0\n\t"
77 : "=&r" (ti), "=r" (__dummy)
78 : "1" (~(THREAD_SIZE - 1))
79 : "memory");
80#endif
81
82 return ti;
83}
84
85/* thread information allocation */
86#ifdef CONFIG_DEBUG_STACK_USAGE
87#define alloc_thread_info(ti) kzalloc(THREAD_SIZE, GFP_KERNEL)
88#else
89#define alloc_thread_info(ti) kmalloc(THREAD_SIZE, GFP_KERNEL)
90#endif
91#define free_thread_info(ti) kfree(ti)
92
93#endif /* __ASSEMBLY__ */
94
95/*
96 * thread information flags
97 * - these are process state flags that various assembly files may need to access
98 * - pending work-to-be-done flags are in LSW
99 * - other flags in MSW
100 */
101#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
102#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
103#define TIF_SIGPENDING 2 /* signal pending */
104#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
105#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
106#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
107#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
108#define TIF_MEMDIE 18
109#define TIF_FREEZE 19
110
111#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
112#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
113#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
114#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
115#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
116#define _TIF_USEDFPU (1<<TIF_USEDFPU)
117#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
118#define _TIF_FREEZE (1<<TIF_FREEZE)
119
120#define _TIF_WORK_MASK 0x000000FE /* work to do on interrupt/exception return */
121#define _TIF_ALLWORK_MASK 0x000000FF /* work to do on any return to u-space */
122
123#endif /* __KERNEL__ */
124
125#endif /* __ASM_SH_THREAD_INFO_H */