/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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 __ASSEMBLER__

#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 */
        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;

        u32 __unused;

        /* 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;
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)                           \
{                                                       \
        .uwinmask       =       0,                      \
        .task           =       &tsk,                   \
        .flags          =       0,                      \
        .cpu            =       0,                      \
        .preempt_count  =       INIT_PREEMPT_COUNT,     \
}

/* 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 /* __ASSEMBLER__ */

/* 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_FLAGS        0x08
#define TI_CPU          0x0c
#define TI_PREEMPT      0x10    /* preempt_count */
#define TI_SOFTIRQ      0x14    /* softirq_count */
#define TI_HARDIRQ      0x18    /* 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

/*
 * 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_NOTIFY_SIGNAL       5       /* signal notifications exist */
#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_NOTIFY_SIGNAL      (1<<TIF_NOTIFY_SIGNAL)
#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_NOTIFY_SIGNAL)

#define is_32bit_task() (1)

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */