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thread_info.h

#ifndef __ASM_SH_THREAD_INFO_H
#define __ASM_SH_THREAD_INFO_H

/* SuperH version
 * Copyright (C) 2002  Niibe Yutaka
 *
 * The copyright of original i386 version is:
 *
 *  Copyright (C) 2002  David Howells (dhowells@redhat.com)
 *  - Incorporating suggestions made by Linus Torvalds and Dave Miller
 */
#ifdef __KERNEL__
#include <asm/page.h>

#ifndef __ASSEMBLY__
#include <asm/processor.h>

struct thread_info {
      struct task_struct      *task;            /* main task structure */
      struct exec_domain      *exec_domain;     /* execution domain */
      unsigned long           flags;            /* low level flags */
      __u32             cpu;
      int               preempt_count; /* 0 => preemptable, <0 => BUG */
      mm_segment_t            addr_limit; /* thread address space */
      struct restart_block    restart_block;
      unsigned long           previous_sp;      /* sp of previous stack in case
                                       of nested IRQ stacks */
      __u8              supervisor_stack[0];
};

#endif

#define PREEMPT_ACTIVE        0x10000000

#if defined(CONFIG_4KSTACKS)
#define THREAD_SIZE_ORDER     (0)
#elif defined(CONFIG_PAGE_SIZE_4KB)
#define THREAD_SIZE_ORDER     (1)
#elif defined(CONFIG_PAGE_SIZE_8KB)
#define THREAD_SIZE_ORDER     (1)
#elif defined(CONFIG_PAGE_SIZE_16KB)
#define THREAD_SIZE_ORDER     (0)
#elif defined(CONFIG_PAGE_SIZE_64KB)
#define THREAD_SIZE_ORDER     (0)
#else
#error "Unknown thread size"
#endif

#define THREAD_SIZE     (PAGE_SIZE << THREAD_SIZE_ORDER)
#define STACK_WARN      (THREAD_SIZE >> 3)

/*
 * macros/functions for gaining access to the thread information structure
 */
#ifndef __ASSEMBLY__
#define INIT_THREAD_INFO(tsk)             \
{                                   \
      .task       = &tsk,                 \
      .exec_domain      = &default_exec_domain, \
      .flags            = 0,              \
      .cpu        = 0,              \
      .preempt_count    = 1,              \
      .addr_limit = KERNEL_DS,            \
      .restart_block    = {               \
            .fn = do_no_restart_syscall,  \
      },                            \
}

#define init_thread_info      (init_thread_union.thread_info)
#define init_stack            (init_thread_union.stack)

/* how to get the current stack pointer from C */
register unsigned long current_stack_pointer asm("r15") __used;

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
      struct thread_info *ti;
#if defined(CONFIG_SUPERH64)
      __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti));
#elif defined(CONFIG_CPU_HAS_SR_RB)
      __asm__ __volatile__ ("stc    r7_bank, %0" : "=r" (ti));
#else
      unsigned long __dummy;

      __asm__ __volatile__ (
            "mov  r15, %0\n\t"
            "and  %1, %0\n\t"
            : "=&r" (ti), "=r" (__dummy)
            : "1" (~(THREAD_SIZE - 1))
            : "memory");
#endif

      return ti;
}

#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

/* thread information allocation */
#ifdef CONFIG_DEBUG_STACK_USAGE
#define alloc_thread_info(ti) kzalloc(THREAD_SIZE, GFP_KERNEL)
#else
#define alloc_thread_info(ti) kmalloc(THREAD_SIZE, GFP_KERNEL)
#endif
#define free_thread_info(ti)  kfree(ti)

#endif /* __ASSEMBLY__ */

/*
 * thread information flags
 * - these are process state flags that various assembly files may need to access
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */
#define TIF_SYSCALL_TRACE     0     /* syscall trace active */
#define TIF_SIGPENDING        1     /* signal pending */
#define TIF_NEED_RESCHED      2     /* rescheduling necessary */
#define TIF_RESTORE_SIGMASK   3     /* restore signal mask in do_signal() */
#define TIF_SINGLESTEP        4     /* singlestepping active */
#define TIF_SYSCALL_AUDIT     5     /* syscall auditing active */
#define TIF_SECCOMP           6     /* secure computing */
#define TIF_NOTIFY_RESUME     7     /* callback before returning to user */
#define TIF_USEDFPU           16    /* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG    17    /* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE            18
#define TIF_FREEZE            19    /* Freezing for suspend */

#define _TIF_SYSCALL_TRACE    (1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING       (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED     (1 << TIF_NEED_RESCHED)
#define _TIF_RESTORE_SIGMASK  (1 << TIF_RESTORE_SIGMASK)
#define _TIF_SINGLESTEP       (1 << TIF_SINGLESTEP)
#define _TIF_SYSCALL_AUDIT    (1 << TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP          (1 << TIF_SECCOMP)
#define _TIF_NOTIFY_RESUME    (1 << TIF_NOTIFY_RESUME)
#define _TIF_USEDFPU          (1 << TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG   (1 << TIF_POLLING_NRFLAG)
#define _TIF_FREEZE           (1 << TIF_FREEZE)

/*
 * _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within a byte, or we
 * blow the tst immediate size constraints and need to fix up
 * arch/sh/kernel/entry-common.S.
 */

/* work to do in syscall trace */
#define _TIF_WORK_SYSCALL_MASK      (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
                         _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)

/* work to do on any return to u-space */
#define _TIF_ALLWORK_MASK     (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
                         _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
                         _TIF_SINGLESTEP    | _TIF_RESTORE_SIGMASK | \
                         _TIF_NOTIFY_RESUME)

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK        (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
                         _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))

#endif /* __KERNEL__ */

#endif /* __ASM_SH_THREAD_INFO_H */

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