1 /* thread_info.h: PowerPC low-level thread information
2 * adapted from the i386 version by Paul Mackerras
4 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
8 #ifndef _ASM_POWERPC_THREAD_INFO_H
9 #define _ASM_POWERPC_THREAD_INFO_H
13 /* We have 8k stacks on ppc32 and 16k on ppc64 */
16 #define THREAD_SHIFT 14
18 #define THREAD_SHIFT 13
21 #define THREAD_SIZE (1 << THREAD_SHIFT)
24 #include <linux/cache.h>
25 #include <asm/processor.h>
27 #include <linux/stringify.h>
30 * low level task data.
33 struct task_struct *task; /* main task structure */
34 struct exec_domain *exec_domain; /* execution domain */
35 int cpu; /* cpu we're on */
36 int preempt_count; /* 0 => preemptable,
38 struct restart_block restart_block;
39 unsigned long local_flags; /* private flags for thread */
41 /* low level flags - has atomic operations done on it */
42 unsigned long flags ____cacheline_aligned_in_smp;
46 * macros/functions for gaining access to the thread information structure
48 * preempt_count needs to be 1 initially, until the scheduler is functional.
50 #define INIT_THREAD_INFO(tsk) \
53 .exec_domain = &default_exec_domain, \
57 .fn = do_no_restart_syscall, \
62 #define init_thread_info (init_thread_union.thread_info)
63 #define init_stack (init_thread_union.stack)
65 /* thread information allocation */
67 #if THREAD_SHIFT >= PAGE_SHIFT
69 #define THREAD_ORDER (THREAD_SHIFT - PAGE_SHIFT)
71 #ifdef CONFIG_DEBUG_STACK_USAGE
72 #define alloc_thread_info(tsk) \
73 ((struct thread_info *)__get_free_pages(GFP_KERNEL | \
74 __GFP_ZERO, THREAD_ORDER))
76 #define alloc_thread_info(tsk) \
77 ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_ORDER))
79 #define free_thread_info(ti) free_pages((unsigned long)ti, THREAD_ORDER)
81 #else /* THREAD_SHIFT < PAGE_SHIFT */
83 #ifdef CONFIG_DEBUG_STACK_USAGE
84 #define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL)
86 #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
88 #define free_thread_info(ti) kfree(ti)
90 #endif /* THREAD_SHIFT < PAGE_SHIFT */
92 /* how to get the thread information struct from C */
93 static inline struct thread_info *current_thread_info(void)
95 register unsigned long sp asm("r1");
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));
102 #endif /* __ASSEMBLY__ */
104 #define PREEMPT_ACTIVE 0x10000000
107 * thread information flag bit numbers
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
115 #define TIF_32BIT 5 /* 32 bit binary */
116 #define TIF_RUNLATCH 6 /* Is the runlatch enabled? */
117 #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 */
122 #define TIF_RESTOREALL 12 /* Restore all regs (implies NOERROR) */
123 #define TIF_NOERROR 14 /* Force successful syscall return */
124 #define TIF_RESTORE_SIGMASK 15 /* Restore signal mask in do_signal */
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)
133 #define _TIF_RUNLATCH (1<<TIF_RUNLATCH)
134 #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)
138 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
139 #define _TIF_NOERROR (1<<TIF_NOERROR)
140 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
141 #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
143 #define _TIF_USER_WORK_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
144 _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK)
145 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
147 /* Bits in local_flags */
148 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
149 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */
151 #define _TLF_NAPPING (1 << TLF_NAPPING)
153 #endif /* __KERNEL__ */
155 #endif /* _ASM_POWERPC_THREAD_INFO_H */