Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/* thread_info.h: OpenRISC low-level thread information

 *

 * Copyright (C) 2002  David Howells (dhowells@redhat.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/types.h>

#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 __ASSEMBLY__

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;            /* current CPU */

        __s32                   preempt_count; /* 0 => preemptable, <0 => BUG */

        mm_segment_t            addr_limit;     /* thread address space:

                                                   0-0x7FFFFFFF for user-thead

                                                   0-0xFFFFFFFF for kernel-thread

                                                */

        struct restart_block    restart_block;

        __u8                    supervisor_stack[0];

        /* saved context data */

        unsigned long           ksp;

};

#else /* !__ASSEMBLY */

/* offsets into the thread_info struct for assembly code access */

#define TI_TASK         0x00000000

#define TI_EXEC_DOMAIN  0x00000004

#define TI_FLAGS        0x00000008

#define TI_STATUS       0x0000000C

#define TI_CPU          0x00000010

#define TI_PRE_COUNT    0x00000014

#define TI_ADDR_LIMIT   0x00000018

#define TI_RESTART_BLOCK 0x000001C

#endif

#define PREEMPT_ACTIVE          0x4000000

/*

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

 *

 * preempt_count needs to be 1 initially, until the scheduler is functional.

 */

#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,    \

        },                                              \

        .ksp            = 0,                            \

}

#define init_thread_info        (init_thread_union.thread_info)

#if 0

/* how to get the thread information struct from C */

static inline struct thread_info *current_thread_info(void)

{

        struct thread_info *ti;

        __asm__("/* current_thread_info */"

                "l.srli %0,r1,%1;"

                "l.slli %0,%0,%1" : "=r" (ti) : "K" (PAGE_SHIFT));

        return ti;

}

#endif

#if 0

/* how to get the thread information struct from C */

static inline struct thread_info *current_thread_info(void)

{

        struct thread_info *ti;

        __asm__("l.ori %0,r10,%1" : "=r" (ti) : "K" (0));

        return ti;

}

#endif

/* how to get the thread information struct from C */

register struct thread_info *current_thread_info_reg asm("r10");

#define current_thread_info()   (current_thread_info_reg)

/* thread information allocation */

#define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))

#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)

#define get_thread_info(ti) get_task_struct((ti)->task)

#define put_thread_info(ti) put_task_struct((ti)->task)

#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_NOTIFY_RESUME       1       /* resumption notification requested */

#define TIF_SIGPENDING          2       /* signal pending */

#define TIF_NEED_RESCHED        3       /* rescheduling necessary */

#define TIF_SINGLESTEP          4       /* restore singlestep on return to user mode */

#define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */

#define TIF_MEMDIE              17

#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_SINGLESTEP         (1<<TIF_SINGLESTEP)

#define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)

/* work to do on interrupt/exception return */

#define _TIF_WORK_MASK \

  (0x0000FFFE & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))

/* work to do on any return to u-space */

#define _TIF_ALLWORK_MASK       0x0000FFFF

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */