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	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 */
 32
 33	mm_segment_t		addr_limit;	/* thread address space:
 34					 	   0-0xBFFFFFFF for user-thread
 35						   0-0xFFFFFFFF for kernel-thread
 36						*/
 37	struct restart_block    restart_block;
 38
 39	__u8			supervisor_stack[0];
 40};
 41
 42#else /* !__ASSEMBLY__ */
 43
 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
 53
 54#endif
 55
 56#define PREEMPT_ACTIVE		0x10000000
 57
 58#define THREAD_SIZE		(PAGE_SIZE << 1)
 59#define THREAD_SIZE_ORDER	1
 60/*
 61 * macros/functions for gaining access to the thread information structure
 62 */
 63#ifndef __ASSEMBLY__
 64
 65#define INIT_THREAD_INFO(tsk)			\
 66{						\
 67	.task		= &tsk,			\
 68	.exec_domain	= &default_exec_domain,	\
 69	.flags		= 0,			\
 70	.cpu		= 0,			\
 71	.preempt_count	= INIT_PREEMPT_COUNT,	\
 72	.addr_limit	= KERNEL_DS,		\
 73	.restart_block = {			\
 74		.fn = do_no_restart_syscall,	\
 75	},					\
 76}
 77
 78#define init_thread_info	(init_thread_union.thread_info)
 79#define init_stack		(init_thread_union.stack)
 80
 81/* how to get the thread information struct from C */
 82static inline struct thread_info *current_thread_info(void)
 83{
 84	struct thread_info *ti;
 85
 86	__asm__ __volatile__ (
 87		"ldi	%0, #%1			\n\t"
 88		"and	%0, sp			\n\t"
 89		: "=r" (ti) : "i" (~(THREAD_SIZE - 1))
 90	);
 91
 92	return ti;
 93}
 94
 95#define TI_FLAG_FAULT_CODE_SHIFT	28
 96
 97static inline void set_thread_fault_code(unsigned int val)
 98{
 99	struct thread_info *ti = current_thread_info();
100	ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
101		| (val << TI_FLAG_FAULT_CODE_SHIFT);
102}
103
104static inline unsigned int get_thread_fault_code(void)
105{
106	struct thread_info *ti = current_thread_info();
107	return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
108}
109
110#endif
111
112/*
113 * thread information flags
114 * - these are process state flags that various assembly files may need to access
115 * - pending work-to-be-done flags are in LSW
116 * - other flags in MSW
117 */
118#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
119#define TIF_SIGPENDING		1	/* signal pending */
120#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
121#define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
122#define TIF_IRET		4	/* return with iret */
123#define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
124#define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal() */
125#define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
126#define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
127#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
128
129#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
130#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
131#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
132#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
133#define _TIF_IRET		(1<<TIF_IRET)
134#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
135#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
136#define _TIF_USEDFPU		(1<<TIF_USEDFPU)
137#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
138
139#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
140#define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
141
142/*
143 * Thread-synchronous status.
144 *
145 * This is different from the flags in that nobody else
146 * ever touches our thread-synchronous status, so we don't
147 * have to worry about atomic accesses.
148 */
149#define TS_USEDFPU		0x0001	/* FPU was used by this task this quantum (SMP) */
150
151#endif /* __KERNEL__ */
152
153#endif /* _ASM_M32R_THREAD_INFO_H */