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David Gibson6cb7bfe2005-10-21 15:45:50 +10001/* thread_info.h: PowerPC low-level thread information
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * adapted from the i386 version by Paul Mackerras
3 *
4 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
6 */
7
David Gibson6cb7bfe2005-10-21 15:45:50 +10008#ifndef _ASM_POWERPC_THREAD_INFO_H
9#define _ASM_POWERPC_THREAD_INFO_H
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
11#ifdef __KERNEL__
12
David Gibson6cb7bfe2005-10-21 15:45:50 +100013/* We have 8k stacks on ppc32 and 16k on ppc64 */
14
15#ifdef CONFIG_PPC64
16#define THREAD_SHIFT 14
17#else
18#define THREAD_SHIFT 13
19#endif
20
21#define THREAD_SIZE (1 << THREAD_SHIFT)
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#ifndef __ASSEMBLY__
24#include <linux/config.h>
25#include <linux/cache.h>
26#include <asm/processor.h>
27#include <asm/page.h>
28#include <linux/stringify.h>
29
30/*
31 * low level task data.
32 */
33struct thread_info {
34 struct task_struct *task; /* main task structure */
35 struct exec_domain *exec_domain; /* execution domain */
36 int cpu; /* cpu we're on */
David Gibson6cb7bfe2005-10-21 15:45:50 +100037 int preempt_count; /* 0 => preemptable,
38 <0 => BUG */
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 struct restart_block restart_block;
David Woodhouse401d1f02005-11-15 18:52:18 +000040 void *nvgprs_frame;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 /* low level flags - has atomic operations done on it */
42 unsigned long flags ____cacheline_aligned_in_smp;
43};
44
45/*
46 * macros/functions for gaining access to the thread information structure
47 *
48 * preempt_count needs to be 1 initially, until the scheduler is functional.
49 */
50#define INIT_THREAD_INFO(tsk) \
51{ \
52 .task = &tsk, \
53 .exec_domain = &default_exec_domain, \
54 .cpu = 0, \
55 .preempt_count = 1, \
56 .restart_block = { \
57 .fn = do_no_restart_syscall, \
58 }, \
59 .flags = 0, \
60}
61
62#define init_thread_info (init_thread_union.thread_info)
63#define init_stack (init_thread_union.stack)
64
65/* thread information allocation */
66
David Gibson328985b2005-10-24 14:05:38 +100067#if THREAD_SHIFT >= PAGE_SHIFT
68
69#define THREAD_ORDER (THREAD_SHIFT - PAGE_SHIFT)
70
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +110071#ifdef CONFIG_DEBUG_STACK_USAGE
David Gibson328985b2005-10-24 14:05:38 +100072#define alloc_thread_info(tsk) \
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +110073 ((struct thread_info *)__get_free_pages(GFP_KERNEL | \
74 __GFP_ZERO, THREAD_ORDER))
75#else
76#define alloc_thread_info(tsk) \
77 ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_ORDER))
78#endif
David Gibson328985b2005-10-24 14:05:38 +100079#define free_thread_info(ti) free_pages((unsigned long)ti, THREAD_ORDER)
80
81#else /* THREAD_SHIFT < PAGE_SHIFT */
82
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +110083#ifdef CONFIG_DEBUG_STACK_USAGE
84#define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL)
85#else
86#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
87#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070088#define free_thread_info(ti) kfree(ti)
David Gibson328985b2005-10-24 14:05:38 +100089
90#endif /* THREAD_SHIFT < PAGE_SHIFT */
91
Linus Torvalds1da177e2005-04-16 15:20:36 -070092/* how to get the thread information struct from C */
93static inline struct thread_info *current_thread_info(void)
94{
David Gibson6cb7bfe2005-10-21 15:45:50 +100095 register unsigned long sp asm("r1");
96
97 /* gcc4, at least, is smart enough to turn this into a single
98 * rlwinm for ppc32 and clrrdi for ppc64 */
99 return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100}
101
102#endif /* __ASSEMBLY__ */
103
104#define PREEMPT_ACTIVE 0x10000000
105
106/*
107 * thread information flag bit numbers
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_POLLING_NRFLAG 4 /* true if poll_idle() is polling
114 TIF_NEED_RESCHED */
115#define TIF_32BIT 5 /* 32 bit binary */
Anton Blanchard6dc2f0c2005-06-02 14:02:02 -0700116/* #define SPARE 6 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117#define TIF_ABI_PENDING 7 /* 32/64 bit switch needed */
118#define TIF_SYSCALL_AUDIT 8 /* syscall auditing active */
119#define TIF_SINGLESTEP 9 /* singlestepping active */
120#define TIF_MEMDIE 10
121#define TIF_SECCOMP 11 /* secure computing */
David Woodhouse401d1f02005-11-15 18:52:18 +0000122#define TIF_RESTOREALL 12 /* Restore all regs (implies NOERROR) */
123#define TIF_SAVE_NVGPRS 13 /* Save r14-r31 in signal frame */
124#define TIF_NOERROR 14 /* Force successful syscall return */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126/* as above, but as bit values */
127#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
128#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
129#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
130#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
131#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
132#define _TIF_32BIT (1<<TIF_32BIT)
Anton Blanchard6dc2f0c2005-06-02 14:02:02 -0700133/* #define _SPARE (1<<SPARE) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
135#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
136#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
137#define _TIF_SECCOMP (1<<TIF_SECCOMP)
David Woodhouse401d1f02005-11-15 18:52:18 +0000138#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
139#define _TIF_SAVE_NVGPRS (1<<TIF_SAVE_NVGPRS)
140#define _TIF_NOERROR (1<<TIF_NOERROR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
142
143#define _TIF_USER_WORK_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
David Woodhouse401d1f02005-11-15 18:52:18 +0000144 _TIF_NEED_RESCHED | _TIF_RESTOREALL)
145#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR|_TIF_SAVE_NVGPRS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
147#endif /* __KERNEL__ */
148
David Gibson6cb7bfe2005-10-21 15:45:50 +1000149#endif /* _ASM_POWERPC_THREAD_INFO_H */