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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#if defined(CONFIG_4KSTACKS)
36#define THREAD_SIZE_ORDER (0)
37#elif defined(CONFIG_PAGE_SIZE_4KB)
38#define THREAD_SIZE_ORDER (1)
39#elif defined(CONFIG_PAGE_SIZE_8KB)
40#define THREAD_SIZE_ORDER (1)
41#elif defined(CONFIG_PAGE_SIZE_64KB)
42#define THREAD_SIZE_ORDER (0)
43#else
44#error "Unknown thread size"
45#endif
46
47#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
48#define STACK_WARN (THREAD_SIZE >> 3)
49
50/*
51 * macros/functions for gaining access to the thread information structure
52 */
53#ifndef __ASSEMBLY__
54#define INIT_THREAD_INFO(tsk) \
55{ \
56 .task = &tsk, \
57 .exec_domain = &default_exec_domain, \
58 .flags = 0, \
59 .cpu = 0, \
60 .preempt_count = 1, \
61 .addr_limit = KERNEL_DS, \
62 .restart_block = { \
63 .fn = do_no_restart_syscall, \
64 }, \
65}
66
67#define init_thread_info (init_thread_union.thread_info)
68#define init_stack (init_thread_union.stack)
69
70/* how to get the current stack pointer from C */
71register unsigned long current_stack_pointer asm("r15") __used;
72
73/* how to get the thread information struct from C */
74static inline struct thread_info *current_thread_info(void)
75{
76 struct thread_info *ti;
77#if defined(CONFIG_SUPERH64)
78 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti));
79#elif defined(CONFIG_CPU_HAS_SR_RB)
80 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti));
81#else
82 unsigned long __dummy;
83
84 __asm__ __volatile__ (
85 "mov r15, %0\n\t"
86 "and %1, %0\n\t"
87 : "=&r" (ti), "=r" (__dummy)
88 : "1" (~(THREAD_SIZE - 1))
89 : "memory");
90#endif
91
92 return ti;
93}
94
95/* thread information allocation */
96#ifdef CONFIG_DEBUG_STACK_USAGE
97#define alloc_thread_info(ti) kzalloc(THREAD_SIZE, GFP_KERNEL)
98#else
99#define alloc_thread_info(ti) kmalloc(THREAD_SIZE, GFP_KERNEL)
100#endif
101#define free_thread_info(ti) kfree(ti)
102
103#endif /* __ASSEMBLY__ */
104
105/*
106 * thread information flags
107 * - these are process state flags that various assembly files may need to access
108 * - pending work-to-be-done flags are in LSW
109 * - other flags in MSW
110 */
111#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
112#define TIF_SIGPENDING 1 /* signal pending */
113#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
114#define TIF_RESTORE_SIGMASK 3 /* restore signal mask in do_signal() */
115#define TIF_SINGLESTEP 4 /* singlestepping active */
116#define TIF_SYSCALL_AUDIT 5
117#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
118#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
119#define TIF_MEMDIE 18
120#define TIF_FREEZE 19
121
122#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
123#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
124#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
125#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
126#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
127#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
128#define _TIF_USEDFPU (1<<TIF_USEDFPU)
129#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
130#define _TIF_FREEZE (1<<TIF_FREEZE)
131
132#define _TIF_WORK_MASK 0x000000FE /* work to do on interrupt/exception return */
133#define _TIF_ALLWORK_MASK 0x000000FF /* work to do on any return to u-space */
134
135#endif /* __KERNEL__ */
136
137#endif /* __ASM_SH_THREAD_INFO_H */