1#ifndef __ASM_SH_THREAD_INFO_H
2#define __ASM_SH_THREAD_INFO_H
3
4/* SuperH version
5 * Copyright (C) 2002  Niibe Yutaka
6 *
7 * The copyright of original i386 version is:
8 *
9 *  Copyright (C) 2002  David Howells (dhowells@redhat.com)
10 *  - Incorporating suggestions made by Linus Torvalds and Dave Miller
11 */
12#ifdef __KERNEL__
13#include <asm/page.h>
14
15#ifndef __ASSEMBLY__
16#include <asm/processor.h>
17
18struct thread_info {
19	struct task_struct	*task;		/* main task structure */
20	struct exec_domain	*exec_domain;	/* execution domain */
21	unsigned long		flags;		/* low level flags */
22	__u32			cpu;
23	int			preempt_count; /* 0 => preemptable, <0 => BUG */
24	mm_segment_t		addr_limit;	/* thread address space */
25	struct restart_block	restart_block;
26	unsigned long		previous_sp;	/* sp of previous stack in case
27						   of nested IRQ stacks */
28	__u8			supervisor_stack[0];
29};
30
31#endif
32
33#define PREEMPT_ACTIVE		0x10000000
34
35#if defined(CONFIG_4KSTACKS)
36#define THREAD_SIZE_ORDER	(0)
37#elif defined(CONFIG_PAGE_SIZE_4KB)
38#define THREAD_SIZE_ORDER	(1)
39#elif defined(CONFIG_PAGE_SIZE_8KB)
40#define THREAD_SIZE_ORDER	(1)
41#elif defined(CONFIG_PAGE_SIZE_64KB)
42#define THREAD_SIZE_ORDER	(0)
43#else
44#error "Unknown thread size"
45#endif
46
47#define THREAD_SIZE	(PAGE_SIZE << THREAD_SIZE_ORDER)
48#define STACK_WARN	(THREAD_SIZE >> 3)
49
50/*
51 * macros/functions for gaining access to the thread information structure
52 */
53#ifndef __ASSEMBLY__
54#define INIT_THREAD_INFO(tsk)			\
55{						\
56	.task		= &tsk,			\
57	.exec_domain	= &default_exec_domain,	\
58	.flags		= 0,			\
59	.cpu		= 0,			\
60	.preempt_count	= 1,			\
61	.addr_limit	= KERNEL_DS,		\
62	.restart_block	= {			\
63		.fn = do_no_restart_syscall,	\
64	},					\
65}
66
67#define init_thread_info	(init_thread_union.thread_info)
68#define init_stack		(init_thread_union.stack)
69
70/* how to get the current stack pointer from C */
71register unsigned long current_stack_pointer asm("r15") __attribute_used__;
72
73/* how to get the thread information struct from C */
74static inline struct thread_info *current_thread_info(void)
75{
76	struct thread_info *ti;
77#ifdef CONFIG_CPU_HAS_SR_RB
78	__asm__("stc	r7_bank, %0" : "=r" (ti));
79#else
80	unsigned long __dummy;
81
82	__asm__ __volatile__ (
83		"mov	r15, %0\n\t"
84		"and	%1, %0\n\t"
85		: "=&r" (ti), "=r" (__dummy)
86		: "1" (~(THREAD_SIZE - 1))
87		: "memory");
88#endif
89
90	return ti;
91}
92
93/* thread information allocation */
94#ifdef CONFIG_DEBUG_STACK_USAGE
95#define alloc_thread_info(ti)	kzalloc(THREAD_SIZE, GFP_KERNEL)
96#else
97#define alloc_thread_info(ti)	kmalloc(THREAD_SIZE, GFP_KERNEL)
98#endif
99#define free_thread_info(ti)	kfree(ti)
100
101#endif /* __ASSEMBLY__ */
102
103/*
104 * thread information flags
105 * - these are process state flags that various assembly files may need to access
106 * - pending work-to-be-done flags are in LSW
107 * - other flags in MSW
108 */
109#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
110#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
111#define TIF_SIGPENDING		2	/* signal pending */
112#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
113#define TIF_RESTORE_SIGMASK	4	/* restore signal mask in do_signal() */
114#define TIF_SINGLESTEP		5	/* singlestepping active */
115#define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
116#define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
117#define TIF_MEMDIE		18
118#define TIF_FREEZE		19
119
120#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
121#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
122#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
123#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
124#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
125#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
126#define _TIF_USEDFPU		(1<<TIF_USEDFPU)
127#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
128#define _TIF_FREEZE		(1<<TIF_FREEZE)
129
130#define _TIF_WORK_MASK		0x000000FE	/* work to do on interrupt/exception return */
131#define _TIF_ALLWORK_MASK	0x000000FF	/* work to do on any return to u-space */
132
133#endif /* __KERNEL__ */
134
135#endif /* __ASM_SH_THREAD_INFO_H */
136