1#ifndef _ASM_M32R_THREAD_INFO_H
  2#define _ASM_M32R_THREAD_INFO_H
  3
  4/* thread_info.h: m32r low-level thread information
  5 *
  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>
  9 */
 10
 11#ifdef __KERNEL__
 12
 13#ifndef __ASSEMBLY__
 14#include <asm/processor.h>
 15#endif
 16
 17/*
 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
 22 */
 23#ifndef __ASSEMBLY__
 24
 25struct thread_info {
 26	struct task_struct	*task;		/* main task structure */
 27	unsigned long		flags;		/* low level flags */
 28	unsigned long		status;		/* thread-synchronous flags */
 29	__u32			cpu;		/* current CPU */
 30	int			preempt_count;	/* 0 => preemptable, <0 => BUG */
 31
 32	mm_segment_t		addr_limit;	/* thread address space:
 33					 	   0-0xBFFFFFFF for user-thread
 34						   0-0xFFFFFFFF for kernel-thread
 35						*/
 36
 37	__u8			supervisor_stack[0];
 38};
 39
 40#endif /* !__ASSEMBLY__ */
 41
 42#define THREAD_SIZE		(PAGE_SIZE << 1)
 43#define THREAD_SIZE_ORDER	1
 44/*
 45 * macros/functions for gaining access to the thread information structure
 46 */
 47#ifndef __ASSEMBLY__
 48
 49#define INIT_THREAD_INFO(tsk)			\
 50{						\
 51	.task		= &tsk,			\
 52	.flags		= 0,			\
 53	.cpu		= 0,			\
 54	.preempt_count	= INIT_PREEMPT_COUNT,	\
 55	.addr_limit	= KERNEL_DS,		\
 56}
 57
 58#define init_thread_info	(init_thread_union.thread_info)
 59#define init_stack		(init_thread_union.stack)
 60
 61/* how to get the thread information struct from C */
 62static inline struct thread_info *current_thread_info(void)
 63{
 64	struct thread_info *ti;
 65
 66	__asm__ __volatile__ (
 67		"ldi	%0, #%1			\n\t"
 68		"and	%0, sp			\n\t"
 69		: "=r" (ti) : "i" (~(THREAD_SIZE - 1))
 70	);
 71
 72	return ti;
 73}
 74
 75#define TI_FLAG_FAULT_CODE_SHIFT	28
 76
 77static inline void set_thread_fault_code(unsigned int val)
 78{
 79	struct thread_info *ti = current_thread_info();
 80	ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
 81		| (val << TI_FLAG_FAULT_CODE_SHIFT);
 82}
 83
 84static inline unsigned int get_thread_fault_code(void)
 85{
 86	struct thread_info *ti = current_thread_info();
 87	return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
 88}
 89
 90#endif
 91
 92/*
 93 * thread information flags
 94 * - these are process state flags that various assembly files may need to access
 95 * - pending work-to-be-done flags are in LSW
 96 * - other flags in MSW
 97 */
 98#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
 99#define TIF_SIGPENDING		1	/* signal pending */
100#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
101#define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
102#define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
103#define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal() */
104#define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
105#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
106
107#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
108#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
109#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
110#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
111#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
112#define _TIF_USEDFPU		(1<<TIF_USEDFPU)
113
114#define _TIF_WORK_MASK		(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
115#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
116
117/*
118 * Thread-synchronous status.
119 *
120 * This is different from the flags in that nobody else
121 * ever touches our thread-synchronous status, so we don't
122 * have to worry about atomic accesses.
123 */
124#define TS_USEDFPU		0x0001	/* FPU was used by this task this quantum (SMP) */
125
126#endif /* __KERNEL__ */
127
128#endif /* _ASM_M32R_THREAD_INFO_H */