1 #ifndef _ASM_M32R_THREAD_INFO_H
2 #define _ASM_M32R_THREAD_INFO_H
4 /* thread_info.h: m32r low-level thread information
6 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
7 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
8 * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
14 #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 must also be changed
26 struct task_struct
*task
; /* main task structure */
27 struct exec_domain
*exec_domain
; /* execution domain */
28 unsigned long flags
; /* low level flags */
29 unsigned long status
; /* thread-synchronous flags */
30 __u32 cpu
; /* current CPU */
31 int preempt_count
; /* 0 => preemptable, <0 => BUG */
33 mm_segment_t addr_limit
; /* thread address space:
34 0-0xBFFFFFFF for user-thread
35 0-0xFFFFFFFF for kernel-thread
37 struct restart_block restart_block
;
39 __u8 supervisor_stack
[0];
42 #else /* !__ASSEMBLY__ */
44 /* offsets into the thread_info struct for assembly code access */
45 #define TI_TASK 0x00000000
46 #define TI_EXEC_DOMAIN 0x00000004
47 #define TI_FLAGS 0x00000008
48 #define TI_STATUS 0x0000000C
49 #define TI_CPU 0x00000010
50 #define TI_PRE_COUNT 0x00000014
51 #define TI_ADDR_LIMIT 0x00000018
52 #define TI_RESTART_BLOCK 0x000001C
56 #define PREEMPT_ACTIVE 0x10000000
59 * macros/functions for gaining access to the thread information structure
61 * preempt_count needs to be 1 initially, until the scheduler is functional.
65 #define INIT_THREAD_INFO(tsk) \
68 .exec_domain = &default_exec_domain, \
72 .addr_limit = KERNEL_DS, \
74 .fn = do_no_restart_syscall, \
78 #define init_thread_info (init_thread_union.thread_info)
79 #define init_stack (init_thread_union.stack)
81 #define THREAD_SIZE (2*PAGE_SIZE)
83 /* how to get the thread information struct from C */
84 static inline struct thread_info
*current_thread_info(void)
86 struct thread_info
*ti
;
88 __asm__
__volatile__ (
91 : "=r" (ti
) : "i" (~(THREAD_SIZE
- 1))
97 /* thread information allocation */
98 #ifdef CONFIG_DEBUG_STACK_USAGE
99 #define alloc_thread_info(tsk) \
101 struct thread_info *ret; \
103 ret = kzalloc(THREAD_SIZE, GFP_KERNEL); \
108 #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
111 #define free_thread_info(info) kfree(info)
113 #define TI_FLAG_FAULT_CODE_SHIFT 28
115 static inline void set_thread_fault_code(unsigned int val
)
117 struct thread_info
*ti
= current_thread_info();
118 ti
->flags
= (ti
->flags
& (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT
)))
119 | (val
<< TI_FLAG_FAULT_CODE_SHIFT
);
122 static inline unsigned int get_thread_fault_code(void)
124 struct thread_info
*ti
= current_thread_info();
125 return ti
->flags
>> TI_FLAG_FAULT_CODE_SHIFT
;
128 #else /* !__ASSEMBLY__ */
130 #define THREAD_SIZE 8192
132 /* how to get the thread information struct from ASM */
133 #define GET_THREAD_INFO(reg) GET_THREAD_INFO reg
134 .macro GET_THREAD_INFO reg
135 ldi
\reg
, #-THREAD_SIZE
142 * thread information flags
143 * - these are process state flags that various assembly files may need to access
144 * - pending work-to-be-done flags are in LSW
145 * - other flags in MSW
147 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
148 #define TIF_SIGPENDING 1 /* signal pending */
149 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
150 #define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
151 #define TIF_IRET 4 /* return with iret */
152 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
153 /* 31..28 fault code */
154 #define TIF_MEMDIE 17
156 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
157 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
158 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
159 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
160 #define _TIF_IRET (1<<TIF_IRET)
161 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
163 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
164 #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
167 * Thread-synchronous status.
169 * This is different from the flags in that nobody else
170 * ever touches our thread-synchronous status, so we don't
171 * have to worry about atomic accesses.
173 #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
175 #endif /* __KERNEL__ */
177 #endif /* _ASM_M32R_THREAD_INFO_H */