/* thread_info.h: PowerPC low-level thread information * adapted from the i386 version by Paul Mackerras * * Copyright (C) 2002 David Howells (dhowells@redhat.com) * - Incorporating suggestions made by Linus Torvalds and Dave Miller */ #ifndef _ASM_POWERPC_THREAD_INFO_H #define _ASM_POWERPC_THREAD_INFO_H #ifdef __KERNEL__ /* We have 8k stacks on ppc32 and 16k on ppc64 */ #ifdef CONFIG_PPC64 #define THREAD_SHIFT 14 #else #define THREAD_SHIFT 13 #endif #define THREAD_SIZE (1 << THREAD_SHIFT) #ifndef __ASSEMBLY__ #include <linux/cache.h> #include <asm/processor.h> #include <asm/page.h> #include <linux/stringify.h> /* * low level task data. */ struct thread_info { struct task_struct *task; /* main task structure */ struct exec_domain *exec_domain; /* execution domain */ int cpu; /* cpu we're on */ int preempt_count; /* 0 => preemptable, <0 => BUG */ struct restart_block restart_block; unsigned long local_flags; /* private flags for thread */ /* low level flags - has atomic operations done on it */ unsigned long flags ____cacheline_aligned_in_smp; }; /* * macros/functions for gaining access to the thread information structure * * preempt_count needs to be 1 initially, until the scheduler is functional. */ #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .exec_domain = &default_exec_domain, \ .cpu = 0, \ .preempt_count = 1, \ .restart_block = { \ .fn = do_no_restart_syscall, \ }, \ .flags = 0, \ } #define init_thread_info (init_thread_union.thread_info) #define init_stack (init_thread_union.stack) /* thread information allocation */ #if THREAD_SHIFT >= PAGE_SHIFT #define THREAD_ORDER (THREAD_SHIFT - PAGE_SHIFT) #ifdef CONFIG_DEBUG_STACK_USAGE #define alloc_thread_info(tsk) \ ((struct thread_info *)__get_free_pages(GFP_KERNEL | \ __GFP_ZERO, THREAD_ORDER)) #else #define alloc_thread_info(tsk) \ ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_ORDER)) #endif #define free_thread_info(ti) free_pages((unsigned long)ti, THREAD_ORDER) #else /* THREAD_SHIFT < PAGE_SHIFT */ extern struct thread_info *alloc_thread_info(struct task_struct *tsk); extern void free_thread_info(struct thread_info *ti); #endif /* THREAD_SHIFT < PAGE_SHIFT */ /* how to get the thread information struct from C */ static inline struct thread_info *current_thread_info(void) { register unsigned long sp asm("r1"); /* gcc4, at least, is smart enough to turn this into a single * rlwinm for ppc32 and clrrdi for ppc64 */ return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); } #endif /* __ASSEMBLY__ */ #define PREEMPT_ACTIVE 0x10000000 /* * thread information flag bit numbers */ #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ #define TIF_SIGPENDING 1 /* signal pending */ #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_32BIT 4 /* 32 bit binary */ #define TIF_PERFMON_WORK 5 /* work for pfm_handle_work() */ #define TIF_PERFMON_CTXSW 6 /* perfmon needs ctxsw calls */ #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ #define TIF_SINGLESTEP 8 /* singlestepping active */ #define TIF_MEMDIE 9 #define TIF_SECCOMP 10 /* secure computing */ #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ #define TIF_NOERROR 12 /* Force successful syscall return */ #define TIF_RESTORE_SIGMASK 13 /* Restore signal mask in do_signal */ #define TIF_FREEZE 14 /* Freezing for suspend */ #define TIF_RUNLATCH 15 /* Is the runlatch enabled? */ #define TIF_ABI_PENDING 16 /* 32/64 bit switch needed */ /* as above, but as bit values */ #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) #define _TIF_32BIT (1<<TIF_32BIT) #define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK) #define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW) #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) #define _TIF_SECCOMP (1<<TIF_SECCOMP) #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) #define _TIF_NOERROR (1<<TIF_NOERROR) #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) #define _TIF_FREEZE (1<<TIF_FREEZE) #define _TIF_RUNLATCH (1<<TIF_RUNLATCH) #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING) #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP) #define _TIF_USER_WORK_MASK ( _TIF_SIGPENDING | \ _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK) #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) /* Bits in local_flags */ /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ #define _TLF_NAPPING (1 << TLF_NAPPING) #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_THREAD_INFO_H */