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 */ 34struct 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/* thread information allocation */ 66 67#if THREAD_SHIFT >= PAGE_SHIFT 68 69#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 70 71#else /* THREAD_SHIFT < PAGE_SHIFT */ 72 73#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 74 75extern struct thread_info *alloc_thread_info(struct task_struct *tsk); 76extern void free_thread_info(struct thread_info *ti); 77 78#endif /* THREAD_SHIFT < PAGE_SHIFT */ 79 80/* how to get the thread information struct from C */ 81static inline struct thread_info *current_thread_info(void) 82{ 83 register unsigned long sp asm("r1"); 84 85 /* gcc4, at least, is smart enough to turn this into a single 86 * rlwinm for ppc32 and clrrdi for ppc64 */ 87 return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); 88} 89 90#endif /* __ASSEMBLY__ */ 91 92#define PREEMPT_ACTIVE 0x10000000 93 94/* 95 * thread information flag bit numbers 96 */ 97#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 98#define TIF_SIGPENDING 1 /* signal pending */ 99#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 100#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling 101 TIF_NEED_RESCHED */ 102#define TIF_32BIT 4 /* 32 bit binary */ 103#define TIF_PERFMON_WORK 5 /* work for pfm_handle_work() */ 104#define TIF_PERFMON_CTXSW 6 /* perfmon needs ctxsw calls */ 105#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ 106#define TIF_SINGLESTEP 8 /* singlestepping active */ 107#define TIF_MEMDIE 9 /* is terminating due to OOM killer */ 108#define TIF_SECCOMP 10 /* secure computing */ 109#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ 110#define TIF_NOERROR 12 /* Force successful syscall return */ 111#define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ 112#define TIF_FREEZE 14 /* Freezing for suspend */ 113#define TIF_RUNLATCH 15 /* Is the runlatch enabled? */ 114 115/* as above, but as bit values */ 116#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 117#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 118#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 119#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 120#define _TIF_32BIT (1<<TIF_32BIT) 121#define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK) 122#define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW) 123#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 124#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 125#define _TIF_SECCOMP (1<<TIF_SECCOMP) 126#define _TIF_RESTOREALL (1<<TIF_RESTOREALL) 127#define _TIF_NOERROR (1<<TIF_NOERROR) 128#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 129#define _TIF_FREEZE (1<<TIF_FREEZE) 130#define _TIF_RUNLATCH (1<<TIF_RUNLATCH) 131#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP) 132 133#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 134 _TIF_NOTIFY_RESUME) 135#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) 136 137/* Bits in local_flags */ 138/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ 139#define TLF_NAPPING 0 /* idle thread enabled NAP mode */ 140#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ 141#define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */ 142 143#define _TLF_NAPPING (1 << TLF_NAPPING) 144#define _TLF_SLEEPING (1 << TLF_SLEEPING) 145#define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK) 146 147#ifndef __ASSEMBLY__ 148#define HAVE_SET_RESTORE_SIGMASK 1 149static inline void set_restore_sigmask(void) 150{ 151 struct thread_info *ti = current_thread_info(); 152 ti->local_flags |= _TLF_RESTORE_SIGMASK; 153 set_bit(TIF_SIGPENDING, &ti->flags); 154} 155 156#ifdef CONFIG_PPC64 157#define is_32bit_task() (test_thread_flag(TIF_32BIT)) 158#else 159#define is_32bit_task() (1) 160#endif 161 162#endif /* !__ASSEMBLY__ */ 163 164#endif /* __KERNEL__ */ 165 166#endif /* _ASM_POWERPC_THREAD_INFO_H */ 167