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#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 23#ifndef __ASSEMBLY__ 24#include <linux/cache.h> 25#include <asm/processor.h> 26#include <asm/page.h> 27#include <linux/stringify.h> 28 29/* 30 * low level task data. 31 */ 32struct thread_info { 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, 37 <0 => BUG */ 38 struct restart_block restart_block; 39 unsigned long local_flags; /* private flags for thread */ 40 41 /* 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 67#if THREAD_SHIFT >= PAGE_SHIFT 68 69#define THREAD_ORDER (THREAD_SHIFT - PAGE_SHIFT) 70 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)) 75#else 76#define alloc_thread_info(tsk) \ 77 ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_ORDER)) 78#endif 79#define free_thread_info(ti) free_pages((unsigned long)ti, THREAD_ORDER) 80 81#else /* THREAD_SHIFT < PAGE_SHIFT */ 82 83#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 88#define free_thread_info(ti) kfree(ti) 89 90#endif /* THREAD_SHIFT < PAGE_SHIFT */ 91 92/* how to get the thread information struct from C */ 93static inline struct thread_info *current_thread_info(void) 94{ 95 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)); 100} 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 */ 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 */ 125#define TIF_FREEZE 16 /* Freezing for suspend */ 126 127/* as above, but as bit values */ 128#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 129#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 130#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 131#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 132#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 133#define _TIF_32BIT (1<<TIF_32BIT) 134#define _TIF_RUNLATCH (1<<TIF_RUNLATCH) 135#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING) 136#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 137#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 138#define _TIF_SECCOMP (1<<TIF_SECCOMP) 139#define _TIF_RESTOREALL (1<<TIF_RESTOREALL) 140#define _TIF_NOERROR (1<<TIF_NOERROR) 141#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 142#define _TIF_FREEZE (1<<TIF_FREEZE) 143#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP) 144 145#define _TIF_USER_WORK_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \ 146 _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK) 147#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) 148 149/* Bits in local_flags */ 150/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ 151#define TLF_NAPPING 0 /* idle thread enabled NAP mode */ 152 153#define _TLF_NAPPING (1 << TLF_NAPPING) 154 155#endif /* __KERNEL__ */ 156 157#endif /* _ASM_POWERPC_THREAD_INFO_H */ 158