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thread_info.h

/* 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_SIZE_ORDER     (THREAD_SHIFT - PAGE_SHIFT)

#else /* THREAD_SHIFT < PAGE_SHIFT */

#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

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_NOTIFY_RESUME     13    /* callback before returning to user */
#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_NOTIFY_RESUME    (1<<TIF_NOTIFY_RESUME)
#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_NOTIFY_RESUME)
#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_NAPPING          (1 << TLF_NAPPING)
#define _TLF_SLEEPING         (1 << TLF_SLEEPING)
#define _TLF_RESTORE_SIGMASK  (1 << TLF_RESTORE_SIGMASK)

#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;
      set_bit(TIF_SIGPENDING, &ti->flags);
}
#endif      /* !__ASSEMBLY__ */

#endif /* __KERNEL__ */

#endif /* _ASM_POWERPC_THREAD_INFO_H */

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