fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-sh / thread_info.h
blob1f7e1deb8d924bf3efc0be3035503ab7bbcb77ef
1 #ifndef __ASM_SH_THREAD_INFO_H
2 #define __ASM_SH_THREAD_INFO_H
4 /* SuperH version
5 * Copyright (C) 2002 Niibe Yutaka
7 * The copyright of original i386 version is:
9 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
10 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
12 #ifdef __KERNEL__
13 #include <asm/page.h>
15 #ifndef __ASSEMBLY__
16 #include <asm/processor.h>
18 struct 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];
31 #endif
33 #define PREEMPT_ACTIVE 0x10000000
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
47 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
48 #define STACK_WARN (THREAD_SIZE >> 3)
51 * macros/functions for gaining access to the thread information structure
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 }, \
67 #define init_thread_info (init_thread_union.thread_info)
68 #define init_stack (init_thread_union.stack)
70 /* how to get the current stack pointer from C */
71 register unsigned long current_stack_pointer asm("r15") __attribute_used__;
73 /* how to get the thread information struct from C */
74 static inline struct thread_info *current_thread_info(void)
76 struct thread_info *ti;
77 #ifdef CONFIG_CPU_HAS_SR_RB
78 __asm__("stc r7_bank, %0" : "=r" (ti));
79 #else
80 unsigned long __dummy;
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
90 return ti;
93 /* thread information allocation */
94 #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)
101 #endif /* __ASSEMBLY__ */
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
109 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
110 #define TIF_SIGPENDING 1 /* signal pending */
111 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
112 #define TIF_RESTORE_SIGMASK 3 /* restore signal mask in do_signal() */
113 #define TIF_SINGLESTEP 4 /* singlestepping active */
114 #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
117 #define TIF_FREEZE 19
119 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
120 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
121 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
122 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
123 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
124 #define _TIF_USEDFPU (1<<TIF_USEDFPU)
125 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
126 #define _TIF_FREEZE (1<<TIF_FREEZE)
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 */
131 #endif /* __KERNEL__ */
133 #endif /* __ASM_SH_THREAD_INFO_H */