thread_info_32.h

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/*
 * thread_info.h: sparc low-level thread information
 * adapted from the ppc version by Pete Zaitcev, which was
 * adapted from the i386 version by Paul Mackerras
 *
 * Copyright (C) 2002  David Howells ([email protected])
 * Copyright (c) 2002  Pete Zaitcev ([email protected])
 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__

#ifndef __ASSEMBLY__

#include <asm/ptrace.h>
#include <asm/page.h>

/*
 * Low level task data.
 *
 * If you change this, change the TI_* offsets below to match.
 */
#define NSWINS 8
struct thread_info {
    unsigned long       uwinmask;
    struct task_struct  *task;      /* main task structure */
    struct exec_domain  *exec_domain;   /* execution domain */
    unsigned long       flags;      /* low level flags */
    int         cpu;        /* cpu we're on */
    int         preempt_count;  /* 0 => preemptable,
                           <0 => BUG */
    int         softirq_count;
    int         hardirq_count;

    /* Context switch saved kernel state. */
    unsigned long ksp;  /* ... ksp __attribute__ ((aligned (8))); */
    unsigned long kpc;
    unsigned long kpsr;
    unsigned long kwim;

    /* A place to store user windows and stack pointers
     * when the stack needs inspection.
     */
    struct reg_window32 reg_window[NSWINS]; /* align for ldd! */
    unsigned long       rwbuf_stkptrs[NSWINS];
    unsigned long       w_saved;

    struct restart_block    restart_block;
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)               \
{                           \
    .uwinmask   =   0,          \
    .task       =   &tsk,           \
    .exec_domain    =   &default_exec_domain,   \
    .flags      =   0,          \
    .cpu        =   0,          \
    .preempt_count  =   INIT_PREEMPT_COUNT, \
    .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 thread information struct from C */
register struct thread_info *current_thread_info_reg asm("g6");
#define current_thread_info()   (current_thread_info_reg)

/*
 * thread information allocation
 */
#define THREAD_SIZE_ORDER  1

#endif /* __ASSEMBLY__ */

/* Size of kernel stack for each process */
#define THREAD_SIZE     (2 * PAGE_SIZE)

/*
 * Offsets in thread_info structure, used in assembly code
 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
 */
#define TI_UWINMASK 0x00    /* uwinmask */
#define TI_TASK     0x04
#define TI_EXECDOMAIN   0x08    /* exec_domain */
#define TI_FLAGS    0x0c
#define TI_CPU      0x10
#define TI_PREEMPT  0x14    /* preempt_count */
#define TI_SOFTIRQ  0x18    /* softirq_count */
#define TI_HARDIRQ  0x1c    /* hardirq_count */
#define TI_KSP      0x20    /* ksp */
#define TI_KPC      0x24    /* kpc (ldd'ed with kpc) */
#define TI_KPSR     0x28    /* kpsr */
#define TI_KWIM     0x2c    /* kwim (ldd'ed with kpsr) */
#define TI_REG_WINDOW   0x30
#define TI_RWIN_SPTRS   0x230
#define TI_W_SAVED  0x250
/* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */

#define PREEMPT_ACTIVE      0x4000000

/*
 * thread information flag bit numbers
 */
#define TIF_SYSCALL_TRACE   0   /* syscall trace active */
#define TIF_NOTIFY_RESUME   1   /* callback before returning to user */
#define TIF_SIGPENDING      2   /* signal pending */
#define TIF_NEED_RESCHED    3   /* rescheduling necessary */
#define TIF_RESTORE_SIGMASK 4   /* restore signal mask in do_signal() */
#define TIF_USEDFPU     8   /* FPU was used by this task
                     * this quantum (SMP) */
#define TIF_POLLING_NRFLAG  9   /* true if poll_idle() is polling
                     * TIF_NEED_RESCHED */
#define TIF_MEMDIE      10  /* is terminating due to OOM killer */

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE  (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME  (1<<TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING     (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED   (1<<TIF_NEED_RESCHED)
#define _TIF_USEDFPU        (1<<TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)

#define _TIF_DO_NOTIFY_RESUME_MASK  (_TIF_NOTIFY_RESUME | \
                     _TIF_SIGPENDING)

#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */