/*
 * include/asm-xtensa/thread_info.h
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _XTENSA_THREAD_INFO_H
#define _XTENSA_THREAD_INFO_H

#include <linux/stringify.h>
#include <asm/kmem_layout.h>

#define CURRENT_SHIFT KERNEL_STACK_SHIFT

#ifndef __ASSEMBLER__
# include <asm/processor.h>
#endif

/*
 * low level task data that entry.S needs immediate access to
 * - this struct should fit entirely inside of one cache line
 * - this struct shares the supervisor stack pages
 * - if the contents of this structure are changed, the assembly constants
 *   must also be changed
 */

#ifndef __ASSEMBLER__

#if XTENSA_HAVE_COPROCESSORS

typedef struct xtregs_coprocessor {
        xtregs_cp0_t cp0;
        xtregs_cp1_t cp1;
        xtregs_cp2_t cp2;
        xtregs_cp3_t cp3;
        xtregs_cp4_t cp4;
        xtregs_cp5_t cp5;
        xtregs_cp6_t cp6;
        xtregs_cp7_t cp7;
} xtregs_coprocessor_t;

#endif

struct thread_info {
        struct task_struct      *task;          /* main task structure */
        unsigned long           flags;          /* low level flags */
        unsigned long           status;         /* thread-synchronous flags */
        __u32                   cpu;            /* current CPU */
        __s32                   preempt_count;  /* 0 => preemptable,< 0 => BUG*/

#if XCHAL_HAVE_EXCLUSIVE
        /* result of the most recent exclusive store */
        unsigned long           atomctl8;
#endif
#ifdef CONFIG_USER_ABI_CALL0_PROBE
        /* Address where PS.WOE was enabled by the ABI probing code */
        unsigned long           ps_woe_fix_addr;
#endif

        /*
         * If i-th bit is set then coprocessor state is loaded into the
         * coprocessor i on CPU cp_owner_cpu.
         */
        unsigned long           cpenable;
        u32                     cp_owner_cpu;
        /* Allocate storage for extra user states and coprocessor states. */
#if XTENSA_HAVE_COPROCESSORS
        xtregs_coprocessor_t    xtregs_cp;
#endif
        xtregs_user_t           xtregs_user;
};

#endif

/*
 * macros/functions for gaining access to the thread information structure
 */

#ifndef __ASSEMBLER__

#define INIT_THREAD_INFO(tsk)                   \
{                                               \
        .task           = &tsk,                 \
        .flags          = 0,                    \
        .cpu            = 0,                    \
        .preempt_count  = INIT_PREEMPT_COUNT,   \
}

/* how to get the thread information struct from C */
static __always_inline struct thread_info *current_thread_info(void)
{
        struct thread_info *ti;
         __asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t"
                 "xor %0, a1, %0" : "=&r" (ti) : );
        return ti;
}

#else /* !__ASSEMBLER__ */

/* how to get the thread information struct from ASM */
#define GET_THREAD_INFO(reg,sp) \
        extui reg, sp, 0, CURRENT_SHIFT; \
        xor   reg, sp, reg
#endif


/*
 * thread information flags
 * - these are process state flags that various assembly files may need to access
 */
#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
#define TIF_SIGPENDING          1       /* signal pending */
#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
#define TIF_SINGLESTEP          3       /* restore singlestep on return to user mode */
#define TIF_SYSCALL_TRACEPOINT  4       /* syscall tracepoint instrumentation */
#define TIF_NOTIFY_SIGNAL       5       /* signal notifications exist */
#define TIF_RESTORE_SIGMASK     6       /* restore signal mask in do_signal() */
#define TIF_NOTIFY_RESUME       7       /* callback before returning to user */
#define TIF_DB_DISABLED         8       /* debug trap disabled for syscall */
#define TIF_SYSCALL_AUDIT       9       /* syscall auditing active */
#define TIF_SECCOMP             10      /* secure computing */
#define TIF_MEMDIE              11      /* is terminating due to OOM killer */

#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
#define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
#define _TIF_NOTIFY_SIGNAL      (1<<TIF_NOTIFY_SIGNAL)
#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
#define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP            (1<<TIF_SECCOMP)

#define _TIF_WORK_MASK          (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
                                 _TIF_SYSCALL_TRACEPOINT | \
                                 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)

#define THREAD_SIZE KERNEL_STACK_SIZE
#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)

#endif  /* _XTENSA_THREAD_INFO */