Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/unicore32/include/asm/thread_info.h
10818 views
1
/*

2
 * linux/arch/unicore32/include/asm/thread_info.h

3
 *

4
 * Code specific to PKUnity SoC and UniCore ISA

5
 *

6
 * Copyright (C) 2001-2010 GUAN Xue-tao

7
 *

8
 * This program is free software; you can redistribute it and/or modify

9
 * it under the terms of the GNU General Public License version 2 as

10
 * published by the Free Software Foundation.

11
 */

12
#ifndef __UNICORE_THREAD_INFO_H__

13
#define __UNICORE_THREAD_INFO_H__

14


15
#ifdef __KERNEL__

16


17
#include <linux/compiler.h>

18
#include <asm/fpstate.h>

19


20
#define THREAD_SIZE_ORDER	1

21
#define THREAD_SIZE		8192

22
#define THREAD_START_SP		(THREAD_SIZE - 8)

23


24
#ifndef __ASSEMBLY__

25


26
struct task_struct;

27
struct exec_domain;

28


29
#include <asm/types.h>

30


31
typedef struct {

32
	unsigned long seg;

33
} mm_segment_t;

34


35
struct cpu_context_save {

36
	__u32	r4;

37
	__u32	r5;

38
	__u32	r6;

39
	__u32	r7;

40
	__u32	r8;

41
	__u32	r9;

42
	__u32	r10;

43
	__u32	r11;

44
	__u32	r12;

45
	__u32	r13;

46
	__u32	r14;

47
	__u32	r15;

48
	__u32	r16;

49
	__u32	r17;

50
	__u32	r18;

51
	__u32	r19;

52
	__u32	r20;

53
	__u32	r21;

54
	__u32	r22;

55
	__u32	r23;

56
	__u32	r24;

57
	__u32	r25;

58
	__u32	r26;

59
	__u32	fp;

60
	__u32	sp;

61
	__u32	pc;

62
};

63


64
/*

65
 * low level task data that entry.S needs immediate access to.

66
 * __switch_to() assumes cpu_context follows immediately after cpu_domain.

67
 */

68
struct thread_info {

69
	unsigned long		flags;		/* low level flags */

70
	int			preempt_count;	/* 0 => preemptable */

71
						/* <0 => bug */

72
	mm_segment_t		addr_limit;	/* address limit */

73
	struct task_struct	*task;		/* main task structure */

74
	struct exec_domain	*exec_domain;	/* execution domain */

75
	__u32			cpu;		/* cpu */

76
	struct cpu_context_save	cpu_context;	/* cpu context */

77
	__u32			syscall;	/* syscall number */

78
	__u8			used_cp[16];	/* thread used copro */

79
#ifdef CONFIG_UNICORE_FPU_F64

80
	struct fp_state		fpstate __attribute__((aligned(8)));

81
#endif

82
	struct restart_block	restart_block;

83
};

84


85
#define INIT_THREAD_INFO(tsk)						\

86
{									\

87
	.task		= &tsk,						\

88
	.exec_domain	= &default_exec_domain,				\

89
	.flags		= 0,						\

90
	.preempt_count	= INIT_PREEMPT_COUNT,				\

91
	.addr_limit	= KERNEL_DS,					\

92
	.restart_block	= {						\

93
		.fn	= do_no_restart_syscall,			\

94
	},								\

95
}

96


97
#define init_thread_info	(init_thread_union.thread_info)

98
#define init_stack		(init_thread_union.stack)

99


100
/*

101
 * how to get the thread information struct from C

102
 */

103
static inline struct thread_info *current_thread_info(void) __attribute_const__;

104


105
static inline struct thread_info *current_thread_info(void)

106
{

107
	register unsigned long sp asm ("sp");

108
	return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));

109
}

110


111
#define thread_saved_pc(tsk)	\

112
	((unsigned long)(task_thread_info(tsk)->cpu_context.pc))

113
#define thread_saved_sp(tsk)	\

114
	((unsigned long)(task_thread_info(tsk)->cpu_context.sp))

115
#define thread_saved_fp(tsk)	\

116
	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))

117


118
#endif

119


120
/*

121
 * We use bit 30 of the preempt_count to indicate that kernel

122
 * preemption is occurring.  See <asm/hardirq.h>.

123
 */

124
#define PREEMPT_ACTIVE	0x40000000

125


126
/*

127
 * thread information flags:

128
 *  TIF_SYSCALL_TRACE	- syscall trace active

129
 *  TIF_SIGPENDING	- signal pending

130
 *  TIF_NEED_RESCHED	- rescheduling necessary

131
 *  TIF_NOTIFY_RESUME	- callback before returning to user

132
 */

133
#define TIF_SIGPENDING		0

134
#define TIF_NEED_RESCHED	1

135
#define TIF_NOTIFY_RESUME	2	/* callback before returning to user */

136
#define TIF_SYSCALL_TRACE	8

137
#define TIF_MEMDIE		18

138
#define TIF_FREEZE		19

139
#define TIF_RESTORE_SIGMASK	20

140


141
#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)

142
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)

143
#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)

144
#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)

145
#define _TIF_FREEZE		(1 << TIF_FREEZE)

146
#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)

147


148
/*

149
 * Change these and you break ASM code in entry-common.S

150
 */

151
#define _TIF_WORK_MASK		0x000000ff

152


153
#endif /* __KERNEL__ */

154
#endif /* __UNICORE_THREAD_INFO_H__ */

155


156