Merge branch 'for-linus' from kernel.org:/.../shaggy/jfs-2.6 manually
[pandora-kernel.git] / 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;  /* 0 => preemptable, <0 => BUG */
50         __u8                    new_child;
51         __u8                    syscall_noerror;
52         __u16                   __pad;
53
54         unsigned long           *utraps;
55
56         struct reg_window       reg_window[NSWINS];
57         unsigned long           rwbuf_stkptrs[NSWINS];
58
59         unsigned long           gsr[7];
60         unsigned long           xfsr[7];
61
62         __u64                   __user *user_cntd0;
63         __u64                   __user *user_cntd1;
64         __u64                   kernel_cntd0, kernel_cntd1;
65         __u64                   pcr_reg;
66
67         __u64                   cee_stuff;
68
69         struct restart_block    restart_block;
70
71         struct pt_regs          *kern_una_regs;
72         unsigned int            kern_una_insn;
73
74         unsigned long           fpregs[0] __attribute__ ((aligned(64)));
75 };
76
77 #endif /* !(__ASSEMBLY__) */
78
79 /* offsets into the thread_info struct for assembly code access */
80 #define TI_TASK         0x00000000
81 #define TI_FLAGS        0x00000008
82 #define TI_FAULT_CODE   (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
83 #define TI_WSTATE       (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
84 #define TI_CWP          (TI_FLAGS + TI_FLAG_BYTE_CWP)
85 #define TI_CURRENT_DS   (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
86 #define TI_FPDEPTH      (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
87 #define TI_WSAVED       (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
88 #define TI_CPU          0x00000010
89 #define TI_FPSAVED      0x00000011
90 #define TI_KSP          0x00000018
91 #define TI_FAULT_ADDR   0x00000020
92 #define TI_KREGS        0x00000028
93 #define TI_EXEC_DOMAIN  0x00000030
94 #define TI_PRE_COUNT    0x00000038
95 #define TI_NEW_CHILD    0x0000003c
96 #define TI_SYS_NOERROR  0x0000003d
97 #define TI_UTRAPS       0x00000040
98 #define TI_REG_WINDOW   0x00000048
99 #define TI_RWIN_SPTRS   0x000003c8      
100 #define TI_GSR          0x00000400
101 #define TI_XFSR         0x00000438
102 #define TI_USER_CNTD0   0x00000470
103 #define TI_USER_CNTD1   0x00000478
104 #define TI_KERN_CNTD0   0x00000480
105 #define TI_KERN_CNTD1   0x00000488
106 #define TI_PCR          0x00000490
107 #define TI_CEE_STUFF    0x00000498
108 #define TI_RESTART_BLOCK 0x000004a0
109 #define TI_KUNA_REGS    0x000004c8
110 #define TI_KUNA_INSN    0x000004d0
111 #define TI_FPREGS       0x00000500
112
113 /* We embed this in the uppermost byte of thread_info->flags */
114 #define FAULT_CODE_WRITE        0x01    /* Write access, implies D-TLB     */
115 #define FAULT_CODE_DTLB         0x02    /* Miss happened in D-TLB          */
116 #define FAULT_CODE_ITLB         0x04    /* Miss happened in I-TLB          */
117 #define FAULT_CODE_WINFIXUP     0x08    /* Miss happened during spill/fill */
118 #define FAULT_CODE_BLKCOMMIT    0x10    /* Use blk-commit ASI in copy_page */
119
120 #if PAGE_SHIFT == 13
121 #define THREAD_SIZE (2*PAGE_SIZE)
122 #define THREAD_SHIFT (PAGE_SHIFT + 1)
123 #else /* PAGE_SHIFT == 13 */
124 #define THREAD_SIZE PAGE_SIZE
125 #define THREAD_SHIFT PAGE_SHIFT
126 #endif /* PAGE_SHIFT == 13 */
127
128 #define PREEMPT_ACTIVE          0x4000000
129
130 /*
131  * macros/functions for gaining access to the thread information structure
132  *
133  * preempt_count needs to be 1 initially, until the scheduler is functional.
134  */
135 #ifndef __ASSEMBLY__
136
137 #define INIT_THREAD_INFO(tsk)                           \
138 {                                                       \
139         .task           =       &tsk,                   \
140         .flags          = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT,   \
141         .exec_domain    =       &default_exec_domain,   \
142         .preempt_count  =       1,                      \
143         .restart_block  = {                             \
144                 .fn     =       do_no_restart_syscall,  \
145         },                                              \
146 }
147
148 #define init_thread_info        (init_thread_union.thread_info)
149 #define init_stack              (init_thread_union.stack)
150
151 /* how to get the thread information struct from C */
152 register struct thread_info *current_thread_info_reg asm("g6");
153 #define current_thread_info()   (current_thread_info_reg)
154
155 /* thread information allocation */
156 #if PAGE_SHIFT == 13
157 #define __THREAD_INFO_ORDER     1
158 #else /* PAGE_SHIFT == 13 */
159 #define __THREAD_INFO_ORDER     0
160 #endif /* PAGE_SHIFT == 13 */
161
162 #ifdef CONFIG_DEBUG_STACK_USAGE
163 #define alloc_thread_info(tsk)                                  \
164 ({                                                              \
165         struct thread_info *ret;                                \
166                                                                 \
167         ret = (struct thread_info *)                            \
168           __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER);    \
169         if (ret)                                                \
170                 memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
171         ret;                                                    \
172 })
173 #else
174 #define alloc_thread_info(tsk) \
175         ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
176 #endif
177
178 #define free_thread_info(ti) \
179         free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
180
181 #define __thread_flag_byte_ptr(ti)      \
182         ((unsigned char *)(&((ti)->flags)))
183 #define __cur_thread_flag_byte_ptr      __thread_flag_byte_ptr(current_thread_info())
184
185 #define get_thread_fault_code()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
186 #define set_thread_fault_code(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
187 #define get_thread_wstate()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
188 #define set_thread_wstate(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
189 #define get_thread_cwp()                (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
190 #define set_thread_cwp(val)             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
191 #define get_thread_current_ds()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
192 #define set_thread_current_ds(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
193 #define get_thread_fpdepth()            (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
194 #define set_thread_fpdepth(val)         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
195 #define get_thread_wsaved()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
196 #define set_thread_wsaved(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
197
198 #endif /* !(__ASSEMBLY__) */
199
200 /*
201  * Thread information flags, only 16 bits are available as we encode
202  * other values into the upper 6 bytes.
203  *
204  * On trap return we need to test several values:
205  *
206  * user:        need_resched, notify_resume, sigpending, wsaved, perfctr
207  * kernel:      fpdepth
208  *
209  * So to check for work in the kernel case we simply load the fpdepth
210  * byte out of the flags and test it.  For the user case we encode the
211  * lower 3 bytes of flags as follows:
212  *      ----------------------------------------
213  *      | wsaved | flags byte 1 | flags byte 2 |
214  *      ----------------------------------------
215  * This optimizes the user test into:
216  *      ldx             [%g6 + TI_FLAGS], REG1
217  *      sethi           %hi(_TIF_USER_WORK_MASK), REG2
218  *      or              REG2, %lo(_TIF_USER_WORK_MASK), REG2
219  *      andcc           REG1, REG2, %g0
220  *      be,pt           no_work_to_do
221  *       nop
222  */
223 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
224 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
225 #define TIF_SIGPENDING          2       /* signal pending */
226 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
227 #define TIF_PERFCTR             4       /* performance counters active */
228 #define TIF_UNALIGNED           5       /* allowed to do unaligned accesses */
229 #define TIF_NEWSIGNALS          6       /* wants new-style signals */
230 #define TIF_32BIT               7       /* 32-bit binary */
231 /* flag bit 8 is available */
232 #define TIF_SECCOMP             9       /* secure computing */
233 #define TIF_SYSCALL_AUDIT       10      /* syscall auditing active */
234 /* flag bit 11 is available */
235 /* NOTE: Thread flags >= 12 should be ones we have no interest
236  *       in using in assembly, else we can't use the mask as
237  *       an immediate value in instructions such as andcc.
238  */
239 #define TIF_ABI_PENDING         12
240 #define TIF_MEMDIE              13
241 #define TIF_POLLING_NRFLAG      14
242
243 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
244 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
245 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
246 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
247 #define _TIF_PERFCTR            (1<<TIF_PERFCTR)
248 #define _TIF_UNALIGNED          (1<<TIF_UNALIGNED)
249 #define _TIF_NEWSIGNALS         (1<<TIF_NEWSIGNALS)
250 #define _TIF_32BIT              (1<<TIF_32BIT)
251 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
252 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
253 #define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
254 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
255
256 #define _TIF_USER_WORK_MASK     ((0xff << TI_FLAG_WSAVED_SHIFT) | \
257                                  (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
258                                   _TIF_NEED_RESCHED | _TIF_PERFCTR))
259
260 #endif /* __KERNEL__ */
261
262 #endif /* _ASM_THREAD_INFO_H */