1 /* thread_info.h: PowerPC low-level thread information 2 * 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 8 #ifndef _ASM_POWERPC_THREAD_INFO_H 9 #define _ASM_POWERPC_THREAD_INFO_H 10 11 #ifdef __KERNEL__ 12 13 /* We have 8k stacks on ppc32 and 16k on ppc64 */ 14 15 #if defined(CONFIG_PPC64) 16 #define THREAD_SHIFT 14 17 #elif defined(CONFIG_PPC_256K_PAGES) 18 #define THREAD_SHIFT 15 19 #else 20 #define THREAD_SHIFT 13 21 #endif 22 23 #define THREAD_SIZE (1 << THREAD_SHIFT) 24 25 #ifndef __ASSEMBLY__ 26 #include <linux/cache.h> 27 #include <asm/processor.h> 28 #include <asm/page.h> 29 #include <linux/stringify.h> 30 31 /* 32 * low level task data. 33 */ 34 struct thread_info { 35 struct task_struct *task; /* main task structure */ 36 struct exec_domain *exec_domain; /* execution domain */ 37 int cpu; /* cpu we're on */ 38 int preempt_count; /* 0 => preemptable, 39 <0 => BUG */ 40 struct restart_block restart_block; 41 unsigned long local_flags; /* private flags for thread */ 42 43 /* low level flags - has atomic operations done on it */ 44 unsigned long flags ____cacheline_aligned_in_smp; 45 }; 46 47 /* 48 * macros/functions for gaining access to the thread information structure 49 */ 50 #define INIT_THREAD_INFO(tsk) \ 51 { \ 52 .task = &tsk, \ 53 .exec_domain = &default_exec_domain, \ 54 .cpu = 0, \ 55 .preempt_count = INIT_PREEMPT_COUNT, \ 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 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 66 67 /* how to get the thread information struct from C */ 68 static inline struct thread_info *current_thread_info(void) 69 { 70 register unsigned long sp asm("r1"); 71 72 /* gcc4, at least, is smart enough to turn this into a single 73 * rlwinm for ppc32 and clrrdi for ppc64 */ 74 return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); 75 } 76 77 #endif /* __ASSEMBLY__ */ 78 79 #define PREEMPT_ACTIVE 0x10000000 80 81 /* 82 * thread information flag bit numbers 83 */ 84 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 85 #define TIF_SIGPENDING 1 /* signal pending */ 86 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 87 #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling 88 TIF_NEED_RESCHED */ 89 #define TIF_32BIT 4 /* 32 bit binary */ 90 #define TIF_PERFMON_WORK 5 /* work for pfm_handle_work() */ 91 #define TIF_PERFMON_CTXSW 6 /* perfmon needs ctxsw calls */ 92 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ 93 #define TIF_SINGLESTEP 8 /* singlestepping active */ 94 #define TIF_MEMDIE 9 /* is terminating due to OOM killer */ 95 #define TIF_SECCOMP 10 /* secure computing */ 96 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ 97 #define TIF_NOERROR 12 /* Force successful syscall return */ 98 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ 99 #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ 100 101 /* as above, but as bit values */ 102 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 103 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 104 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 105 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 106 #define _TIF_32BIT (1<<TIF_32BIT) 107 #define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK) 108 #define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW) 109 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 110 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 111 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 112 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) 113 #define _TIF_NOERROR (1<<TIF_NOERROR) 114 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 115 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 116 #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 117 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT) 118 119 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 120 _TIF_NOTIFY_RESUME) 121 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) 122 123 /* Bits in local_flags */ 124 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ 125 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ 126 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ 127 #define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */ 128 #define TLF_LAZY_MMU 3 /* tlb_batch is active */ 129 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ 130 131 #define _TLF_NAPPING (1 << TLF_NAPPING) 132 #define _TLF_SLEEPING (1 << TLF_SLEEPING) 133 #define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK) 134 #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) 135 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) 136 137 #ifndef __ASSEMBLY__ 138 #define HAVE_SET_RESTORE_SIGMASK 1 139 static inline void set_restore_sigmask(void) 140 { 141 struct thread_info *ti = current_thread_info(); 142 ti->local_flags |= _TLF_RESTORE_SIGMASK; 143 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags)); 144 } 145 static inline void clear_restore_sigmask(void) 146 { 147 current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK; 148 } 149 static inline bool test_restore_sigmask(void) 150 { 151 return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK; 152 } 153 static inline bool test_and_clear_restore_sigmask(void) 154 { 155 struct thread_info *ti = current_thread_info(); 156 if (!(ti->local_flags & _TLF_RESTORE_SIGMASK)) 157 return false; 158 ti->local_flags &= ~_TLF_RESTORE_SIGMASK; 159 return true; 160 } 161 162 static inline bool test_thread_local_flags(unsigned int flags) 163 { 164 struct thread_info *ti = current_thread_info(); 165 return (ti->local_flags & flags) != 0; 166 } 167 168 #ifdef CONFIG_PPC64 169 #define is_32bit_task() (test_thread_flag(TIF_32BIT)) 170 #else 171 #define is_32bit_task() (1) 172 #endif 173 174 #endif /* !__ASSEMBLY__ */ 175 176 #endif /* __KERNEL__ */ 177 178 #endif /* _ASM_POWERPC_THREAD_INFO_H */ 179