fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-sparc / thread_info.h
blob91b9f5888c855defa112d38ec20761a6664f1875
1 /*
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
9 */
11 #ifndef _ASM_THREAD_INFO_H
12 #define _ASM_THREAD_INFO_H
14 #ifdef __KERNEL__
16 #ifndef __ASSEMBLY__
18 #include <asm/btfixup.h>
19 #include <asm/ptrace.h>
20 #include <asm/page.h>
23 * Low level task data.
25 * If you change this, change the TI_* offsets below to match.
27 #define NSWINS 8
28 struct thread_info {
29 unsigned long uwinmask;
30 struct task_struct *task; /* main task structure */
31 struct exec_domain *exec_domain; /* execution domain */
32 unsigned long flags; /* low level flags */
33 int cpu; /* cpu we're on */
34 int preempt_count; /* 0 => preemptable,
35 <0 => BUG */
36 int softirq_count;
37 int hardirq_count;
39 /* Context switch saved kernel state. */
40 unsigned long ksp; /* ... ksp __attribute__ ((aligned (8))); */
41 unsigned long kpc;
42 unsigned long kpsr;
43 unsigned long kwim;
45 /* A place to store user windows and stack pointers
46 * when the stack needs inspection.
48 struct reg_window reg_window[NSWINS]; /* align for ldd! */
49 unsigned long rwbuf_stkptrs[NSWINS];
50 unsigned long w_saved;
52 struct restart_block restart_block;
56 * macros/functions for gaining access to the thread information structure
58 * preempt_count needs to be 1 initially, until the scheduler is functional.
60 #define INIT_THREAD_INFO(tsk) \
61 { \
62 .uwinmask = 0, \
63 .task = &tsk, \
64 .exec_domain = &default_exec_domain, \
65 .flags = 0, \
66 .cpu = 0, \
67 .preempt_count = 1, \
68 .restart_block = { \
69 .fn = do_no_restart_syscall, \
70 }, \
73 #define init_thread_info (init_thread_union.thread_info)
74 #define init_stack (init_thread_union.stack)
76 /* how to get the thread information struct from C */
77 register struct thread_info *current_thread_info_reg asm("g6");
78 #define current_thread_info() (current_thread_info_reg)
81 * thread information allocation
83 #if PAGE_SHIFT == 13
84 #define THREAD_INFO_ORDER 0
85 #else /* PAGE_SHIFT */
86 #define THREAD_INFO_ORDER 1
87 #endif
89 BTFIXUPDEF_CALL(struct thread_info *, alloc_thread_info, void)
90 #define alloc_thread_info(tsk) BTFIXUP_CALL(alloc_thread_info)()
92 BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
93 #define free_thread_info(ti) BTFIXUP_CALL(free_thread_info)(ti)
95 #endif /* __ASSEMBLY__ */
98 * Size of kernel stack for each process.
99 * Observe the order of get_free_pages() in alloc_thread_info().
100 * The sun4 has 8K stack too, because it's short on memory, and 16K is a waste.
102 #define THREAD_SIZE 8192
105 * Offsets in thread_info structure, used in assembly code
106 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
108 #define TI_UWINMASK 0x00 /* uwinmask */
109 #define TI_TASK 0x04
110 #define TI_EXECDOMAIN 0x08 /* exec_domain */
111 #define TI_FLAGS 0x0c
112 #define TI_CPU 0x10
113 #define TI_PREEMPT 0x14 /* preempt_count */
114 #define TI_SOFTIRQ 0x18 /* softirq_count */
115 #define TI_HARDIRQ 0x1c /* hardirq_count */
116 #define TI_KSP 0x20 /* ksp */
117 #define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */
118 #define TI_KPSR 0x28 /* kpsr */
119 #define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */
120 #define TI_REG_WINDOW 0x30
121 #define TI_RWIN_SPTRS 0x230
122 #define TI_W_SAVED 0x250
123 /* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
125 #define PREEMPT_ACTIVE 0x4000000
128 * thread information flag bit numbers
130 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
131 /* flag bit 1 is available */
132 #define TIF_SIGPENDING 2 /* signal pending */
133 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
134 #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
135 #define TIF_USEDFPU 8 /* FPU was used by this task
136 * this quantum (SMP) */
137 #define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling
138 * TIF_NEED_RESCHED */
139 #define TIF_MEMDIE 10
141 /* as above, but as bit values */
142 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
143 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
144 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
145 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
146 #define _TIF_USEDFPU (1<<TIF_USEDFPU)
147 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
149 #endif /* __KERNEL__ */
151 #endif /* _ASM_THREAD_INFO_H */