blob: 279e70a77c75350a8ce7fc24e5fe707e766d69d6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#ifdef __KERNEL__
Paul Mundta6a311392006-09-27 18:22:14 +090013#include <asm/page.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
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 */
Akinobu Mita6ecf66a2006-03-26 01:39:51 -080021 unsigned long flags; /* low level flags */
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 __u32 cpu;
Jesper Juhldcd497f2005-06-23 00:09:07 -070023 int preempt_count; /* 0 => preemptable, <0 => BUG */
Paul Mundt2991be72006-09-27 17:07:07 +090024 mm_segment_t addr_limit; /* thread address space */
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 struct restart_block restart_block;
Paul Mundta6a311392006-09-27 18:22:14 +090026 unsigned long previous_sp; /* sp of previous stack in case
27 of nested IRQ stacks */
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 __u8 supervisor_stack[0];
29};
30
31#endif
32
Paul Mundt37053cc2005-05-28 15:52:01 -070033#define PREEMPT_ACTIVE 0x10000000
Paul Mundta6a311392006-09-27 18:22:14 +090034
Paul Mundt7a847f82006-12-26 15:29:19 +090035#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)
Paul Mundta6a311392006-09-27 18:22:14 +090043#else
Paul Mundt7a847f82006-12-26 15:29:19 +090044#error "Unknown thread size"
Paul Mundta6a311392006-09-27 18:22:14 +090045#endif
Paul Mundt7a847f82006-12-26 15:29:19 +090046
47#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
48#define STACK_WARN (THREAD_SIZE >> 3)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
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, \
Paul Mundt2991be72006-09-27 17:07:07 +090061 .addr_limit = KERNEL_DS, \
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 .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
Paul Mundta6a311392006-09-27 18:22:14 +090070/* how to get the current stack pointer from C */
71register unsigned long current_stack_pointer asm("r15") __attribute_used__;
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073/* how to get the thread information struct from C */
74static inline struct thread_info *current_thread_info(void)
75{
76 struct thread_info *ti;
Paul Mundtf1517492006-09-27 16:01:12 +090077#ifdef CONFIG_CPU_HAS_SR_RB
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 __asm__("stc r7_bank, %0" : "=r" (ti));
Paul Mundtf1517492006-09-27 16:01:12 +090079#else
80 unsigned long __dummy;
81
82 __asm__ __volatile__ (
83 "mov r15, %0\n\t"
84 "and %1, %0\n\t"
85 : "=&r" (ti), "=r" (__dummy)
86 : "1" (~(THREAD_SIZE - 1))
87 : "memory");
88#endif
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 return ti;
91}
92
93/* thread information allocation */
Paul Mundtd153ea82006-09-27 18:20:16 +090094#ifdef CONFIG_DEBUG_STACK_USAGE
95#define alloc_thread_info(ti) kzalloc(THREAD_SIZE, GFP_KERNEL)
96#else
97#define alloc_thread_info(ti) kmalloc(THREAD_SIZE, GFP_KERNEL)
98#endif
99#define free_thread_info(ti) kfree(ti)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Paul Mundt510c72ad2006-11-27 12:06:26 +0900101#endif /* __ASSEMBLY__ */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103/*
104 * thread information flags
105 * - these are process state flags that various assembly files may need to access
106 * - pending work-to-be-done flags are in LSW
107 * - other flags in MSW
108 */
109#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
110#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
111#define TIF_SIGPENDING 2 /* signal pending */
112#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
Paul Mundt9f23e7e2006-09-27 17:27:00 +0900113#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
115#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
116#define TIF_MEMDIE 18
Rafael J. Wysocki8a102ee2006-12-13 00:34:30 -0800117#define TIF_FREEZE 19
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
119#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
120#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
121#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
122#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
Paul Mundt9f23e7e2006-09-27 17:27:00 +0900123#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124#define _TIF_USEDFPU (1<<TIF_USEDFPU)
125#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
Rafael J. Wysocki8a102ee2006-12-13 00:34:30 -0800126#define _TIF_FREEZE (1<<TIF_FREEZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128#define _TIF_WORK_MASK 0x000000FE /* work to do on interrupt/exception return */
129#define _TIF_ALLWORK_MASK 0x000000FF /* work to do on any return to u-space */
130
131#endif /* __KERNEL__ */
132
133#endif /* __ASM_SH_THREAD_INFO_H */