include/asm-sparc64/thread_info.h

   1 /* $Id: thread_info.h,v 1.1 2002/02/10 00:00:58 davem Exp $
   2  * thread_info.h: sparc64 low-level thread information
   3  *
   4  * Copyright (C) 2002  David S. Miller (davem@redhat.com)
   5  */
   6
   7 #ifndef _ASM_THREAD_INFO_H
   8 #define _ASM_THREAD_INFO_H
   9
  10 #ifdef __KERNEL__
  11
  12 #define NSWINS          7
  13
  14 #define TI_FLAG_BYTE_FAULT_CODE         0
  15 #define TI_FLAG_FAULT_CODE_SHIFT        56
  16 #define TI_FLAG_BYTE_WSTATE             1
  17 #define TI_FLAG_WSTATE_SHIFT            48
  18 #define TI_FLAG_BYTE_CWP                2
  19 #define TI_FLAG_CWP_SHIFT               40
  20 #define TI_FLAG_BYTE_CURRENT_DS         3
  21 #define TI_FLAG_CURRENT_DS_SHIFT        32
  22 #define TI_FLAG_BYTE_FPDEPTH            4
  23 #define TI_FLAG_FPDEPTH_SHIFT           24
  24 #define TI_FLAG_BYTE_WSAVED             5
  25 #define TI_FLAG_WSAVED_SHIFT            16
  26
  27 #include <asm/page.h>
  28
  29 #ifndef __ASSEMBLY__
  30
  31 #include <asm/ptrace.h>
  32 #include <asm/types.h>
  33
  34 struct task_struct;
  35 struct exec_domain;
  36
  37 struct thread_info {
  38         /* D$ line 1 */
  39         struct task_struct      *task;
  40         unsigned long           flags;
  41         __u8                    cpu;
  42         __u8                    fpsaved[7];
  43         unsigned long           ksp;
  44
  45         /* D$ line 2 */
  46         unsigned long           fault_address;
  47         struct pt_regs          *kregs;
  48         struct exec_domain      *exec_domain;
  49         int                     preempt_count;
  50         int                     __pad;
  51
  52         unsigned long           *utraps;
  53
  54         struct reg_window       reg_window[NSWINS];
  55         unsigned long           rwbuf_stkptrs[NSWINS];
  56
  57         unsigned long           gsr[7];
  58         unsigned long           xfsr[7];
  59
  60         __u64                   __user *user_cntd0;
  61         __u64                   __user *user_cntd1;
  62         __u64                   kernel_cntd0, kernel_cntd1;
  63         __u64                   pcr_reg;
  64
  65         __u64                   cee_stuff;
  66
  67         struct restart_block    restart_block;
  68
  69         unsigned long           fpregs[0] __attribute__ ((aligned(64)));
  70 };
  71
  72 #endif /* !(__ASSEMBLY__) */
  73
  74 /* offsets into the thread_info struct for assembly code access */
  75 #define TI_TASK         0x00000000
  76 #define TI_FLAGS        0x00000008
  77 #define TI_FAULT_CODE   (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
  78 #define TI_WSTATE       (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
  79 #define TI_CWP          (TI_FLAGS + TI_FLAG_BYTE_CWP)
  80 #define TI_CURRENT_DS   (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
  81 #define TI_FPDEPTH      (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
  82 #define TI_WSAVED       (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
  83 #define TI_CPU          0x00000010
  84 #define TI_FPSAVED      0x00000011
  85 #define TI_KSP          0x00000018
  86 #define TI_FAULT_ADDR   0x00000020
  87 #define TI_KREGS        0x00000028
  88 #define TI_EXEC_DOMAIN  0x00000030
  89 #define TI_PRE_COUNT    0x00000038
  90 #define TI_UTRAPS       0x00000040
  91 #define TI_REG_WINDOW   0x00000048
  92 #define TI_RWIN_SPTRS   0x000003c8
  93 #define TI_GSR          0x00000400
  94 #define TI_XFSR         0x00000438
  95 #define TI_USER_CNTD0   0x00000470
  96 #define TI_USER_CNTD1   0x00000478
  97 #define TI_KERN_CNTD0   0x00000480
  98 #define TI_KERN_CNTD1   0x00000488
  99 #define TI_PCR          0x00000490
 100 #define TI_CEE_STUFF    0x00000498
 101 #define TI_RESTART_BLOCK 0x000004a0
 102 #define TI_FPREGS       0x00000500
 103
 104 /* We embed this in the uppermost byte of thread_info->flags */
 105 #define FAULT_CODE_WRITE        0x01    /* Write access, implies D-TLB     */
 106 #define FAULT_CODE_DTLB         0x02    /* Miss happened in D-TLB          */
 107 #define FAULT_CODE_ITLB         0x04    /* Miss happened in I-TLB          */
 108 #define FAULT_CODE_WINFIXUP     0x08    /* Miss happened during spill/fill */
 109 #define FAULT_CODE_BLKCOMMIT    0x10    /* Use blk-commit ASI in copy_page */
 110
 111 #if PAGE_SHIFT == 13
 112 #define THREAD_SIZE (2*PAGE_SIZE)
 113 #define THREAD_SHIFT (PAGE_SHIFT + 1)
 114 #else /* PAGE_SHIFT == 13 */
 115 #define THREAD_SIZE PAGE_SIZE
 116 #define THREAD_SHIFT PAGE_SHIFT
 117 #endif /* PAGE_SHIFT == 13 */
 118
 119 #define PREEMPT_ACTIVE          0x4000000
 120
 121 /*
 122  * macros/functions for gaining access to the thread information structure
 123  *
 124  * preempt_count needs to be 1 initially, until the scheduler is functional.
 125  */
 126 #ifndef __ASSEMBLY__
 127
 128 #define INIT_THREAD_INFO(tsk)                           \
 129 {                                                       \
 130         .task           =       &tsk,                   \
 131         .flags          = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT,   \
 132         .exec_domain    =       &default_exec_domain,   \
 133         .preempt_count  =       1,                      \
 134         .restart_block  = {                             \
 135                 .fn     =       do_no_restart_syscall,  \
 136         },                                              \
 137 }
 138
 139 #define init_thread_info        (init_thread_union.thread_info)
 140 #define init_stack              (init_thread_union.stack)
 141
 142 /* how to get the thread information struct from C */
 143 register struct thread_info *current_thread_info_reg asm("g6");
 144 #define current_thread_info()   (current_thread_info_reg)
 145
 146 /* thread information allocation */
 147 #if PAGE_SHIFT == 13
 148 #define __THREAD_INFO_ORDER     1
 149 #else /* PAGE_SHIFT == 13 */
 150 #define __THREAD_INFO_ORDER     0
 151 #endif /* PAGE_SHIFT == 13 */
 152
 153 #ifdef CONFIG_DEBUG_STACK_USAGE
 154 #define alloc_thread_info(tsk)                                  \
 155 ({                                                              \
 156         struct thread_info *ret;                                \
 157                                                                 \
 158         ret = (struct thread_info *)                            \
 159           __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER);    \
 160         if (ret)                                                \
 161                 memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
 162         ret;                                                    \
 163 })
 164 #else
 165 #define alloc_thread_info(tsk) \
 166         ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
 167 #endif
 168
 169 #define free_thread_info(ti) \
 170         free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
 171
 172 #define __thread_flag_byte_ptr(ti)      \
 173         ((unsigned char *)(&((ti)->flags)))
 174 #define __cur_thread_flag_byte_ptr      __thread_flag_byte_ptr(current_thread_info())
 175
 176 #define get_thread_fault_code()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
 177 #define set_thread_fault_code(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
 178 #define get_thread_wstate()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
 179 #define set_thread_wstate(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
 180 #define get_thread_cwp()                (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
 181 #define set_thread_cwp(val)             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
 182 #define get_thread_current_ds()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
 183 #define set_thread_current_ds(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
 184 #define get_thread_fpdepth()            (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
 185 #define set_thread_fpdepth(val)         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
 186 #define get_thread_wsaved()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
 187 #define set_thread_wsaved(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
 188
 189 #endif /* !(__ASSEMBLY__) */
 190
 191 /*
 192  * Thread information flags, only 16 bits are available as we encode
 193  * other values into the upper 6 bytes.
 194  *
 195  * On trap return we need to test several values:
 196  *
 197  * user:        need_resched, notify_resume, sigpending, wsaved, perfctr
 198  * kernel:      fpdepth
 199  *
 200  * So to check for work in the kernel case we simply load the fpdepth
 201  * byte out of the flags and test it.  For the user case we encode the
 202  * lower 3 bytes of flags as follows:
 203  *      ----------------------------------------
 204  *      | wsaved | flags byte 1 | flags byte 2 |
 205  *      ----------------------------------------
 206  * This optimizes the user test into:
 207  *      ldx             [%g6 + TI_FLAGS], REG1
 208  *      sethi           %hi(_TIF_USER_WORK_MASK), REG2
 209  *      or              REG2, %lo(_TIF_USER_WORK_MASK), REG2
 210  *      andcc           REG1, REG2, %g0
 211  *      be,pt           no_work_to_do
 212  *       nop
 213  */
 214 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 215 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
 216 #define TIF_SIGPENDING          2       /* signal pending */
 217 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 218 #define TIF_PERFCTR             4       /* performance counters active */
 219 #define TIF_UNALIGNED           5       /* allowed to do unaligned accesses */
 220 #define TIF_NEWSIGNALS          6       /* wants new-style signals */
 221 #define TIF_32BIT               7       /* 32-bit binary */
 222 #define TIF_NEWCHILD            8       /* just-spawned child process */
 223 /* TIF_* value 9 is available */
 224 #define TIF_POLLING_NRFLAG      10
 225 #define TIF_SYSCALL_SUCCESS     11
 226 /* NOTE: Thread flags >= 12 should be ones we have no interest
 227  *       in using in assembly, else we can't use the mask as
 228  *       an immediate value in instructions such as andcc.
 229  */
 230 #define TIF_ABI_PENDING         12
 231 #define TIF_MEMDIE              13
 232
 233 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 234 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 235 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 236 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 237 #define _TIF_PERFCTR            (1<<TIF_PERFCTR)
 238 #define _TIF_UNALIGNED          (1<<TIF_UNALIGNED)
 239 #define _TIF_NEWSIGNALS         (1<<TIF_NEWSIGNALS)
 240 #define _TIF_32BIT              (1<<TIF_32BIT)
 241 #define _TIF_NEWCHILD           (1<<TIF_NEWCHILD)
 242 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 243 #define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
 244 #define _TIF_SYSCALL_SUCCESS    (1<<TIF_SYSCALL_SUCCESS)
 245
 246 #define _TIF_USER_WORK_MASK     ((0xff << TI_FLAG_WSAVED_SHIFT) | \
 247                                  (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
 248                                   _TIF_NEED_RESCHED | _TIF_PERFCTR))
 249
 250 #endif /* __KERNEL__ */
 251
 252 #endif /* _ASM_THREAD_INFO_H */