2 * thread_info.h: sparc low-level thread information
3 * adapted from the ppc version by Pete Zaitcev, which was
4 * adapted from the i386 version by Paul Mackerras
6 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
7 * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
8 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
11 #ifndef _ASM_THREAD_INFO_H
12 #define _ASM_THREAD_INFO_H
18 #include <asm/ptrace.h>
22 * Low level task data.
24 * If you change this, change the TI_* offsets below to match.
28 unsigned long uwinmask
;
29 struct task_struct
*task
; /* main task structure */
30 struct exec_domain
*exec_domain
; /* execution domain */
31 unsigned long flags
; /* low level flags */
32 int cpu
; /* cpu we're on */
33 int preempt_count
; /* 0 => preemptable,
38 /* Context switch saved kernel state. */
39 unsigned long ksp
; /* ... ksp __attribute__ ((aligned (8))); */
44 /* A place to store user windows and stack pointers
45 * when the stack needs inspection.
47 struct reg_window32 reg_window
[NSWINS
]; /* align for ldd! */
48 unsigned long rwbuf_stkptrs
[NSWINS
];
49 unsigned long w_saved
;
51 struct restart_block restart_block
;
55 * macros/functions for gaining access to the thread information structure
57 #define INIT_THREAD_INFO(tsk) \
61 .exec_domain = &default_exec_domain, \
64 .preempt_count = INIT_PREEMPT_COUNT, \
66 .fn = do_no_restart_syscall, \
70 #define init_thread_info (init_thread_union.thread_info)
71 #define init_stack (init_thread_union.stack)
73 /* how to get the thread information struct from C */
74 register struct thread_info
*current_thread_info_reg
asm("g6");
75 #define current_thread_info() (current_thread_info_reg)
78 * thread information allocation
80 #define THREAD_INFO_ORDER 1
82 struct thread_info
* alloc_thread_info_node(struct task_struct
*tsk
, int node
);
83 void free_thread_info(struct thread_info
*);
85 #endif /* __ASSEMBLY__ */
88 * Size of kernel stack for each process.
89 * Observe the order of get_free_pages() in alloc_thread_info_node().
90 * The sun4 has 8K stack too, because it's short on memory, and 16K is a waste.
92 #define THREAD_SIZE (2 * PAGE_SIZE)
95 * Offsets in thread_info structure, used in assembly code
96 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
98 #define TI_UWINMASK 0x00 /* uwinmask */
100 #define TI_EXECDOMAIN 0x08 /* exec_domain */
101 #define TI_FLAGS 0x0c
103 #define TI_PREEMPT 0x14 /* preempt_count */
104 #define TI_SOFTIRQ 0x18 /* softirq_count */
105 #define TI_HARDIRQ 0x1c /* hardirq_count */
106 #define TI_KSP 0x20 /* ksp */
107 #define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */
108 #define TI_KPSR 0x28 /* kpsr */
109 #define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */
110 #define TI_REG_WINDOW 0x30
111 #define TI_RWIN_SPTRS 0x230
112 #define TI_W_SAVED 0x250
113 /* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
115 #define PREEMPT_ACTIVE 0x4000000
118 * thread information flag bit numbers
120 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
121 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
122 #define TIF_SIGPENDING 2 /* signal pending */
123 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
124 #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
125 #define TIF_USEDFPU 8 /* FPU was used by this task
126 * this quantum (SMP) */
127 #define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling
128 * TIF_NEED_RESCHED */
129 #define TIF_MEMDIE 10 /* is terminating due to OOM killer */
131 /* as above, but as bit values */
132 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
133 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
134 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
135 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
136 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
137 #define _TIF_USEDFPU (1<<TIF_USEDFPU)
138 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
140 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \
142 _TIF_RESTORE_SIGMASK)
144 #endif /* __KERNEL__ */
146 #endif /* _ASM_THREAD_INFO_H */