linux/include/asm-xtensa/thread_info.h
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   1/*
   2 * include/asm-xtensa/thread_info.h
   3 *
   4 * This file is subject to the terms and conditions of the GNU General Public
   5 * License.  See the file "COPYING" in the main directory of this archive
   6 * for more details.
   7 *
   8 * Copyright (C) 2001 - 2005 Tensilica Inc.
   9 */
  10
  11#ifndef _XTENSA_THREAD_INFO_H
  12#define _XTENSA_THREAD_INFO_H
  13
  14#ifdef __KERNEL__
  15
  16#ifndef __ASSEMBLY__
  17# include <asm/processor.h>
  18#endif
  19
  20/*
  21 * low level task data that entry.S needs immediate access to
  22 * - this struct should fit entirely inside of one cache line
  23 * - this struct shares the supervisor stack pages
  24 * - if the contents of this structure are changed, the assembly constants
  25 *   must also be changed
  26 */
  27
  28#ifndef __ASSEMBLY__
  29
  30#if XTENSA_HAVE_COPROCESSORS
  31
  32typedef struct xtregs_coprocessor {
  33        xtregs_cp0_t cp0;
  34        xtregs_cp1_t cp1;
  35        xtregs_cp2_t cp2;
  36        xtregs_cp3_t cp3;
  37        xtregs_cp4_t cp4;
  38        xtregs_cp5_t cp5;
  39        xtregs_cp6_t cp6;
  40        xtregs_cp7_t cp7;
  41} xtregs_coprocessor_t;
  42
  43#endif
  44
  45struct thread_info {
  46        struct task_struct      *task;          /* main task structure */
  47        struct exec_domain      *exec_domain;   /* execution domain */
  48        unsigned long           flags;          /* low level flags */
  49        unsigned long           status;         /* thread-synchronous flags */
  50        __u32                   cpu;            /* current CPU */
  51        __s32                   preempt_count;  /* 0 => preemptable,< 0 => BUG*/
  52
  53        mm_segment_t            addr_limit;     /* thread address space */
  54        struct restart_block    restart_block;
  55
  56        unsigned long           cpenable;
  57
  58        /* Allocate storage for extra user states and coprocessor states. */
  59#if XTENSA_HAVE_COPROCESSORS
  60        xtregs_coprocessor_t    xtregs_cp;
  61#endif
  62        xtregs_user_t           xtregs_user;
  63};
  64
  65#else /* !__ASSEMBLY__ */
  66
  67/* offsets into the thread_info struct for assembly code access */
  68#define TI_TASK          0x00000000
  69#define TI_EXEC_DOMAIN   0x00000004
  70#define TI_FLAGS         0x00000008
  71#define TI_STATUS        0x0000000C
  72#define TI_CPU           0x00000010
  73#define TI_PRE_COUNT     0x00000014
  74#define TI_ADDR_LIMIT    0x00000018
  75#define TI_RESTART_BLOCK 0x000001C
  76
  77#endif
  78
  79#define PREEMPT_ACTIVE          0x10000000
  80
  81/*
  82 * macros/functions for gaining access to the thread information structure
  83 *
  84 * preempt_count needs to be 1 initially, until the scheduler is functional.
  85 */
  86
  87#ifndef __ASSEMBLY__
  88
  89#define INIT_THREAD_INFO(tsk)                   \
  90{                                               \
  91        .task           = &tsk,                 \
  92        .exec_domain    = &default_exec_domain, \
  93        .flags          = 0,                    \
  94        .cpu            = 0,                    \
  95        .preempt_count  = 1,                    \
  96        .addr_limit     = KERNEL_DS,            \
  97        .restart_block = {                      \
  98                .fn = do_no_restart_syscall,    \
  99        },                                      \
 100}
 101
 102#define init_thread_info        (init_thread_union.thread_info)
 103#define init_stack              (init_thread_union.stack)
 104
 105/* how to get the thread information struct from C */
 106static inline struct thread_info *current_thread_info(void)
 107{
 108        struct thread_info *ti;
 109         __asm__("extui %0,a1,0,13\n\t"
 110                 "xor %0, a1, %0" : "=&r" (ti) : );
 111        return ti;
 112}
 113
 114#else /* !__ASSEMBLY__ */
 115
 116/* how to get the thread information struct from ASM */
 117#define GET_THREAD_INFO(reg,sp) \
 118        extui reg, sp, 0, 13; \
 119        xor   reg, sp, reg
 120#endif
 121
 122
 123/*
 124 * thread information flags
 125 * - these are process state flags that various assembly files may need to access
 126 * - pending work-to-be-done flags are in LSW
 127 * - other flags in MSW
 128 */
 129#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 130#define TIF_SIGPENDING          1       /* signal pending */
 131#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 132#define TIF_SINGLESTEP          3       /* restore singlestep on return to user mode */
 133#define TIF_IRET                4       /* return with iret */
 134#define TIF_MEMDIE              5
 135#define TIF_RESTORE_SIGMASK     6       /* restore signal mask in do_signal() */
 136#define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 137#define TIF_FREEZE              17      /* is freezing for suspend */
 138
 139#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 140#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 141#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 142#define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 143#define _TIF_IRET               (1<<TIF_IRET)
 144#define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 145#define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 146#define _TIF_FREEZE             (1<<TIF_FREEZE)
 147
 148#define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
 149#define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
 150
 151/*
 152 * Thread-synchronous status.
 153 *
 154 * This is different from the flags in that nobody else
 155 * ever touches our thread-synchronous status, so we don't
 156 * have to worry about atomic accesses.
 157 */
 158#define TS_USEDFPU              0x0001  /* FPU was used by this task this quantum (SMP) */
 159
 160#define THREAD_SIZE 8192        //(2*PAGE_SIZE)
 161#define THREAD_SIZE_ORDER 1
 162
 163#endif  /* __KERNEL__ */
 164#endif  /* _XTENSA_THREAD_INFO */
 165