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thread_info_32.h

/*
 * 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 (dhowells@redhat.com)
 * Copyright (c) 2002  Pete Zaitcev (zaitcev@yahoo.com)
 * - 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/btfixup.h>
#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_window 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
 *
 * preempt_count needs to be 1 initially, until the scheduler is functional.
 */
#define INIT_THREAD_INFO(tsk)                   \
{                                         \
      .uwinmask   =     0,                \
      .task       =     &tsk,             \
      .exec_domain      =     &default_exec_domain,   \
      .flags            =     0,                \
      .cpu        =     0,                \
      .preempt_count    =     1,                \
      .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
 */
#if PAGE_SHIFT == 13
#define THREAD_INFO_ORDER  0
#else /* PAGE_SHIFT */
#define THREAD_INFO_ORDER  1
#endif

#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

BTFIXUPDEF_CALL(struct thread_info *, alloc_thread_info, void)
#define alloc_thread_info(tsk) BTFIXUP_CALL(alloc_thread_info)()

BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
#define free_thread_info(ti) BTFIXUP_CALL(free_thread_info)(ti)

#endif /* __ASSEMBLY__ */

/*
 * Size of kernel stack for each process.
 * Observe the order of get_free_pages() in alloc_thread_info().
 * The sun4 has 8K stack too, because it's short on memory, and 16K is a waste.
 */
#define THREAD_SIZE           8192

/*
 * 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

/* 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_RESTORE_SIGMASK  (1<<TIF_RESTORE_SIGMASK)
#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 | \
                               _TIF_RESTORE_SIGMASK)

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */

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