16a8016372
Make default just return 0. The current default (checking TIF_POLLING_NRFLAG) is taken to architectures that need it; ones that don't do polling in their idle threads don't need to defined TIF_POLLING_NRFLAG at all. ia64 defined both TS_POLLING (used by its tsk_is_polling()) and TIF_POLLING_NRFLAG (not used at all). Killed the latter... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
216 lines
6.3 KiB
C
216 lines
6.3 KiB
C
#ifndef __ASM_SH_THREAD_INFO_H
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#define __ASM_SH_THREAD_INFO_H
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/* SuperH version
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* Copyright (C) 2002 Niibe Yutaka
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*
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* The copyright of original i386 version is:
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*
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* Copyright (C) 2002 David Howells (dhowells@redhat.com)
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* - Incorporating suggestions made by Linus Torvalds and Dave Miller
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*/
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#ifdef __KERNEL__
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#include <asm/page.h>
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/*
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* Page fault error code bits
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*/
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#define FAULT_CODE_WRITE (1 << 0) /* write access */
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#define FAULT_CODE_INITIAL (1 << 1) /* initial page write */
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#define FAULT_CODE_ITLB (1 << 2) /* ITLB miss */
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#define FAULT_CODE_PROT (1 << 3) /* protection fault */
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#define FAULT_CODE_USER (1 << 4) /* user-mode access */
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#ifndef __ASSEMBLY__
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#include <asm/processor.h>
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struct thread_info {
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struct task_struct *task; /* main task structure */
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struct exec_domain *exec_domain; /* execution domain */
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unsigned long flags; /* low level flags */
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__u32 status; /* thread synchronous flags */
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__u32 cpu;
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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mm_segment_t addr_limit; /* thread address space */
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struct restart_block restart_block;
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unsigned long previous_sp; /* sp of previous stack in case
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of nested IRQ stacks */
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__u8 supervisor_stack[0];
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};
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#endif
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#define PREEMPT_ACTIVE 0x10000000
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#if defined(CONFIG_4KSTACKS)
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#define THREAD_SHIFT 12
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#else
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#define THREAD_SHIFT 13
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#endif
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#define THREAD_SIZE (1 << THREAD_SHIFT)
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#define STACK_WARN (THREAD_SIZE >> 3)
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/*
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* macros/functions for gaining access to the thread information structure
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*/
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#ifndef __ASSEMBLY__
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.exec_domain = &default_exec_domain, \
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.flags = 0, \
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.status = 0, \
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.cpu = 0, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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.addr_limit = KERNEL_DS, \
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.restart_block = { \
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.fn = do_no_restart_syscall, \
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}, \
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}
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#define init_thread_info (init_thread_union.thread_info)
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#define init_stack (init_thread_union.stack)
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/* how to get the current stack pointer from C */
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register unsigned long current_stack_pointer asm("r15") __used;
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/* how to get the thread information struct from C */
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static inline struct thread_info *current_thread_info(void)
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{
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struct thread_info *ti;
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#if defined(CONFIG_SUPERH64)
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__asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti));
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#elif defined(CONFIG_CPU_HAS_SR_RB)
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__asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti));
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#else
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unsigned long __dummy;
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__asm__ __volatile__ (
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"mov r15, %0\n\t"
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"and %1, %0\n\t"
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: "=&r" (ti), "=r" (__dummy)
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: "1" (~(THREAD_SIZE - 1))
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: "memory");
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#endif
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return ti;
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}
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#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
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extern void arch_task_cache_init(void);
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extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
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extern void arch_release_task_struct(struct task_struct *tsk);
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extern void init_thread_xstate(void);
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#endif /* __ASSEMBLY__ */
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/*
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* Thread information flags
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*
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* - Limited to 24 bits, upper byte used for fault code encoding.
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*
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* - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or
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* we blow the tst immediate size constraints and need to fix up
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* arch/sh/kernel/entry-common.S.
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_SIGPENDING 1 /* signal pending */
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#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
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#define TIF_SINGLESTEP 4 /* singlestepping active */
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#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
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#define TIF_SECCOMP 6 /* secure computing */
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#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
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#define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */
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#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
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#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
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#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
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#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
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#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
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#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
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#define _TIF_SECCOMP (1 << TIF_SECCOMP)
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#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
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#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
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#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
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/* work to do in syscall trace */
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#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
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_TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
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_TIF_SYSCALL_TRACEPOINT)
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/* work to do on any return to u-space */
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#define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \
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_TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \
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_TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \
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_TIF_SYSCALL_TRACEPOINT)
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/* work to do on interrupt/exception return */
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#define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
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_TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
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/*
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* Thread-synchronous status.
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*
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* This is different from the flags in that nobody else
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* ever touches our thread-synchronous status, so we don't
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* have to worry about atomic accesses.
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*/
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#define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
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#define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */
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#ifndef __ASSEMBLY__
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#define HAVE_SET_RESTORE_SIGMASK 1
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static inline void set_restore_sigmask(void)
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{
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struct thread_info *ti = current_thread_info();
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ti->status |= TS_RESTORE_SIGMASK;
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WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
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}
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#define TI_FLAG_FAULT_CODE_SHIFT 24
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/*
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* Additional thread flag encoding
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*/
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static inline void set_thread_fault_code(unsigned int val)
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{
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struct thread_info *ti = current_thread_info();
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ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
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| (val << TI_FLAG_FAULT_CODE_SHIFT);
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}
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static inline unsigned int get_thread_fault_code(void)
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{
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struct thread_info *ti = current_thread_info();
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return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
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}
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static inline void clear_restore_sigmask(void)
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{
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current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
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}
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static inline bool test_restore_sigmask(void)
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{
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return current_thread_info()->status & TS_RESTORE_SIGMASK;
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}
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static inline bool test_and_clear_restore_sigmask(void)
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{
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struct thread_info *ti = current_thread_info();
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if (!(ti->status & TS_RESTORE_SIGMASK))
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return false;
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ti->status &= ~TS_RESTORE_SIGMASK;
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return true;
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}
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#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
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#endif /* !__ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* __ASM_SH_THREAD_INFO_H */
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