| /* 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 */ |
| |
| #if defined(CONFIG_PPC64) |
| #define THREAD_SHIFT 14 |
| #elif defined(CONFIG_PPC_256K_PAGES) |
| #define THREAD_SHIFT 15 |
| #else |
| #define THREAD_SHIFT 13 |
| #endif |
| |
| #define THREAD_SIZE (1 << THREAD_SHIFT) |
| |
| #ifdef CONFIG_PPC64 |
| #define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(clrrdi dest, sp, THREAD_SHIFT) |
| #else |
| #define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT) |
| #endif |
| |
| #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 */ |
| 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 |
| */ |
| #define INIT_THREAD_INFO(tsk) \ |
| { \ |
| .task = &tsk, \ |
| .exec_domain = &default_exec_domain, \ |
| .cpu = 0, \ |
| .preempt_count = INIT_PREEMPT_COUNT, \ |
| .flags = 0, \ |
| } |
| |
| #define init_thread_info (init_thread_union.thread_info) |
| #define init_stack (init_thread_union.stack) |
| |
| #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) |
| |
| /* how to get the thread information struct from C */ |
| static inline struct thread_info *current_thread_info(void) |
| { |
| unsigned long val; |
| |
| asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val)); |
| |
| return (struct thread_info *)val; |
| } |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| /* |
| * 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_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ |
| #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ |
| #define TIF_SINGLESTEP 8 /* singlestepping active */ |
| #define TIF_NOHZ 9 /* in adaptive nohz mode */ |
| #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_NOTIFY_RESUME 13 /* callback before returning to user */ |
| #define TIF_UPROBE 14 /* breakpointed or single-stepping */ |
| #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ |
| #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation |
| for stack store? */ |
| #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ |
| #if defined(CONFIG_PPC64) |
| #define TIF_ELF2ABI 18 /* function descriptors must die! */ |
| #endif |
| |
| /* 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_RESTORE_TM (1<<TIF_RESTORE_TM) |
| #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_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
| #define _TIF_UPROBE (1<<TIF_UPROBE) |
| #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) |
| #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) |
| #define _TIF_NOHZ (1<<TIF_NOHZ) |
| #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ |
| _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ |
| _TIF_NOHZ) |
| |
| #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ |
| _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ |
| _TIF_RESTORE_TM) |
| #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_SLEEPING 1 /* suspend code enabled SLEEP mode */ |
| #define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */ |
| #define TLF_LAZY_MMU 3 /* tlb_batch is active */ |
| #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ |
| |
| #define _TLF_NAPPING (1 << TLF_NAPPING) |
| #define _TLF_SLEEPING (1 << TLF_SLEEPING) |
| #define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK) |
| #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) |
| #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) |
| |
| #ifndef __ASSEMBLY__ |
| #define HAVE_SET_RESTORE_SIGMASK 1 |
| static inline void set_restore_sigmask(void) |
| { |
| struct thread_info *ti = current_thread_info(); |
| ti->local_flags |= _TLF_RESTORE_SIGMASK; |
| WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags)); |
| } |
| static inline void clear_restore_sigmask(void) |
| { |
| current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK; |
| } |
| static inline bool test_restore_sigmask(void) |
| { |
| return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK; |
| } |
| static inline bool test_and_clear_restore_sigmask(void) |
| { |
| struct thread_info *ti = current_thread_info(); |
| if (!(ti->local_flags & _TLF_RESTORE_SIGMASK)) |
| return false; |
| ti->local_flags &= ~_TLF_RESTORE_SIGMASK; |
| return true; |
| } |
| |
| static inline bool test_thread_local_flags(unsigned int flags) |
| { |
| struct thread_info *ti = current_thread_info(); |
| return (ti->local_flags & flags) != 0; |
| } |
| |
| #ifdef CONFIG_PPC64 |
| #define is_32bit_task() (test_thread_flag(TIF_32BIT)) |
| #else |
| #define is_32bit_task() (1) |
| #endif |
| |
| #if defined(CONFIG_PPC64) |
| #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI)) |
| #else |
| #define is_elf2_task() (0) |
| #endif |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _ASM_POWERPC_THREAD_INFO_H */ |