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
 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 __HAVE_ARCH_THREAD_INFO_ALLOCATOR
 96
 97/* thread information allocation */
 98#ifdef CONFIG_DEBUG_STACK_USAGE
 99#define alloc_thread_info_node(tsk, node)			\
100		kzalloc_node(THREAD_SIZE, GFP_KERNEL, node)
101#else
102#define alloc_thread_info_node(tsk, node)			\
103		kmalloc_node(THREAD_SIZE, GFP_KERNEL, node)
104#endif
105
106#define free_thread_info(info) kfree(info)
107
108#define TI_FLAG_FAULT_CODE_SHIFT	28
109
110static inline void set_thread_fault_code(unsigned int val)
111{
112	struct thread_info *ti = current_thread_info();
113	ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
114		| (val << TI_FLAG_FAULT_CODE_SHIFT);
115}
116
117static inline unsigned int get_thread_fault_code(void)
118{
119	struct thread_info *ti = current_thread_info();
120	return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
121}
122
123#endif
124
125/*
126 * thread information flags
127 * - these are process state flags that various assembly files may need to access
128 * - pending work-to-be-done flags are in LSW
129 * - other flags in MSW
130 */
131#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
132#define TIF_SIGPENDING		1	/* signal pending */
133#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
134#define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
135#define TIF_IRET		4	/* return with iret */
136#define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
137#define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal() */
138#define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
139#define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
140#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
141#define TIF_FREEZE		19	/* is freezing for suspend */
142
143#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
144#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
145#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
146#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
147#define _TIF_IRET		(1<<TIF_IRET)
148#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
149#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
150#define _TIF_USEDFPU		(1<<TIF_USEDFPU)
151#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
152#define _TIF_FREEZE		(1<<TIF_FREEZE)
153
154#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
155#define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
156
157/*
158 * Thread-synchronous status.
159 *
160 * This is different from the flags in that nobody else
161 * ever touches our thread-synchronous status, so we don't
162 * have to worry about atomic accesses.
163 */
164#define TS_USEDFPU		0x0001	/* FPU was used by this task this quantum (SMP) */
165
166#endif /* __KERNEL__ */
167
168#endif /* _ASM_M32R_THREAD_INFO_H */