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 * preempt_count needs to be 1 initially, until the scheduler is functional. 51 */ 52 #define INIT_THREAD_INFO(tsk) \ 53 { \ 54 .task = &tsk, \ 55 .exec_domain = &default_exec_domain, \ 56 .cpu = 0, \ 57 .preempt_count = 1, \ 58 .restart_block = { \ 59 .fn = do_no_restart_syscall, \ 60 }, \ 61 .flags = 0, \ 62 } 63 64 #define init_thread_info (init_thread_union.thread_info) 65 #define init_stack (init_thread_union.stack) 66 67 /* thread information allocation */ 68 69 #if THREAD_SHIFT >= PAGE_SHIFT 70 71 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 72 73 #else /* THREAD_SHIFT < PAGE_SHIFT */ 74 75 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 76 77 extern struct thread_info *alloc_thread_info(struct task_struct *tsk); 78 extern void free_thread_info(struct thread_info *ti); 79 80 #endif /* THREAD_SHIFT < PAGE_SHIFT */ 81 82 /* how to get the thread information struct from C */ 83 static inline struct thread_info *current_thread_info(void) 84 { 85 register unsigned long sp asm("r1"); 86 87 /* gcc4, at least, is smart enough to turn this into a single 88 * rlwinm for ppc32 and clrrdi for ppc64 */ 89 return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); 90 } 91 92 #endif /* __ASSEMBLY__ */ 93 94 #define PREEMPT_ACTIVE 0x10000000 95 96 /* 97 * thread information flag bit numbers 98 */ 99 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 100 #define TIF_SIGPENDING 1 /* signal pending */ 101 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 102 #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling 103 TIF_NEED_RESCHED */ 104 #define TIF_32BIT 4 /* 32 bit binary */ 105 #define TIF_PERFMON_WORK 5 /* work for pfm_handle_work() */ 106 #define TIF_PERFMON_CTXSW 6 /* perfmon needs ctxsw calls */ 107 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ 108 #define TIF_SINGLESTEP 8 /* singlestepping active */ 109 #define TIF_MEMDIE 9 110 #define TIF_SECCOMP 10 /* secure computing */ 111 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ 112 #define TIF_NOERROR 12 /* Force successful syscall return */ 113 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ 114 #define TIF_FREEZE 14 /* Freezing for suspend */ 115 #define TIF_RUNLATCH 15 /* Is the runlatch enabled? */ 116 #define TIF_ABI_PENDING 16 /* 32/64 bit switch needed */ 117 118 /* as above, but as bit values */ 119 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 120 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 121 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 122 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 123 #define _TIF_32BIT (1<<TIF_32BIT) 124 #define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK) 125 #define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW) 126 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 127 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 128 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 129 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) 130 #define _TIF_NOERROR (1<<TIF_NOERROR) 131 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 132 #define _TIF_FREEZE (1<<TIF_FREEZE) 133 #define _TIF_RUNLATCH (1<<TIF_RUNLATCH) 134 #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING) 135 #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP) 136 137 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 138 _TIF_NOTIFY_RESUME) 139 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) 140 141 /* Bits in local_flags */ 142 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ 143 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ 144 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ 145 #define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */ 146 147 #define _TLF_NAPPING (1 << TLF_NAPPING) 148 #define _TLF_SLEEPING (1 << TLF_SLEEPING) 149 #define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK) 150 151 #ifndef __ASSEMBLY__ 152 #define HAVE_SET_RESTORE_SIGMASK 1 153 static inline void set_restore_sigmask(void) 154 { 155 struct thread_info *ti = current_thread_info(); 156 ti->local_flags |= _TLF_RESTORE_SIGMASK; 157 set_bit(TIF_SIGPENDING, &ti->flags); 158 } 159 160 #ifdef CONFIG_PPC64 161 #define is_32bit_task() (test_thread_flag(TIF_32BIT)) 162 #else 163 #define is_32bit_task() (1) 164 #endif 165 166 #endif /* !__ASSEMBLY__ */ 167 168 #endif /* __KERNEL__ */ 169 170 #endif /* _ASM_POWERPC_THREAD_INFO_H */ 171