[SPARC64]: Use machine description and OBP properly for cpu probing.
[linux-2.6.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         struct restart_block    restart_block;
68
69         struct pt_regs          *kern_una_regs;
70         unsigned int            kern_una_insn;
71
72         unsigned long           fpregs[0] __attribute__ ((aligned(64)));
73 };
74
75 #endif /* !(__ASSEMBLY__) */
76
77 /* offsets into the thread_info struct for assembly code access */
78 #define TI_TASK         0x00000000
79 #define TI_FLAGS        0x00000008
80 #define TI_FAULT_CODE   (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
81 #define TI_WSTATE       (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
82 #define TI_CWP          (TI_FLAGS + TI_FLAG_BYTE_CWP)
83 #define TI_CURRENT_DS   (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
84 #define TI_FPDEPTH      (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
85 #define TI_WSAVED       (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
86 #define TI_CPU          0x00000010
87 #define TI_FPSAVED      0x00000011
88 #define TI_KSP          0x00000018
89 #define TI_FAULT_ADDR   0x00000020
90 #define TI_KREGS        0x00000028
91 #define TI_EXEC_DOMAIN  0x00000030
92 #define TI_PRE_COUNT    0x00000038
93 #define TI_NEW_CHILD    0x0000003c
94 #define TI_SYS_NOERROR  0x0000003d
95 #define TI_UTRAPS       0x00000040
96 #define TI_REG_WINDOW   0x00000048
97 #define TI_RWIN_SPTRS   0x000003c8      
98 #define TI_GSR          0x00000400
99 #define TI_XFSR         0x00000438
100 #define TI_USER_CNTD0   0x00000470
101 #define TI_USER_CNTD1   0x00000478
102 #define TI_KERN_CNTD0   0x00000480
103 #define TI_KERN_CNTD1   0x00000488
104 #define TI_PCR          0x00000490
105 #define TI_RESTART_BLOCK 0x00000498
106 #define TI_KUNA_REGS    0x000004c0
107 #define TI_KUNA_INSN    0x000004c8
108 #define TI_FPREGS       0x00000500
109
110 /* We embed this in the uppermost byte of thread_info->flags */
111 #define FAULT_CODE_WRITE        0x01    /* Write access, implies D-TLB     */
112 #define FAULT_CODE_DTLB         0x02    /* Miss happened in D-TLB          */
113 #define FAULT_CODE_ITLB         0x04    /* Miss happened in I-TLB          */
114 #define FAULT_CODE_WINFIXUP     0x08    /* Miss happened during spill/fill */
115 #define FAULT_CODE_BLKCOMMIT    0x10    /* Use blk-commit ASI in copy_page */
116
117 #if PAGE_SHIFT == 13
118 #define THREAD_SIZE (2*PAGE_SIZE)
119 #define THREAD_SHIFT (PAGE_SHIFT + 1)
120 #else /* PAGE_SHIFT == 13 */
121 #define THREAD_SIZE PAGE_SIZE
122 #define THREAD_SHIFT PAGE_SHIFT
123 #endif /* PAGE_SHIFT == 13 */
124
125 #define PREEMPT_ACTIVE          0x4000000
126
127 /*
128  * macros/functions for gaining access to the thread information structure
129  *
130  * preempt_count needs to be 1 initially, until the scheduler is functional.
131  */
132 #ifndef __ASSEMBLY__
133
134 #define INIT_THREAD_INFO(tsk)                           \
135 {                                                       \
136         .task           =       &tsk,                   \
137         .flags          = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT,   \
138         .exec_domain    =       &default_exec_domain,   \
139         .preempt_count  =       1,                      \
140         .restart_block  = {                             \
141                 .fn     =       do_no_restart_syscall,  \
142         },                                              \
143 }
144
145 #define init_thread_info        (init_thread_union.thread_info)
146 #define init_stack              (init_thread_union.stack)
147
148 /* how to get the thread information struct from C */
149 register struct thread_info *current_thread_info_reg asm("g6");
150 #define current_thread_info()   (current_thread_info_reg)
151
152 /* thread information allocation */
153 #if PAGE_SHIFT == 13
154 #define __THREAD_INFO_ORDER     1
155 #else /* PAGE_SHIFT == 13 */
156 #define __THREAD_INFO_ORDER     0
157 #endif /* PAGE_SHIFT == 13 */
158
159 #ifdef CONFIG_DEBUG_STACK_USAGE
160 #define alloc_thread_info(tsk)                                  \
161 ({                                                              \
162         struct thread_info *ret;                                \
163                                                                 \
164         ret = (struct thread_info *)                            \
165           __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER);    \
166         if (ret)                                                \
167                 memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
168         ret;                                                    \
169 })
170 #else
171 #define alloc_thread_info(tsk) \
172         ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
173 #endif
174
175 #define free_thread_info(ti) \
176         free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
177
178 #define __thread_flag_byte_ptr(ti)      \
179         ((unsigned char *)(&((ti)->flags)))
180 #define __cur_thread_flag_byte_ptr      __thread_flag_byte_ptr(current_thread_info())
181
182 #define get_thread_fault_code()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
183 #define set_thread_fault_code(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
184 #define get_thread_wstate()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
185 #define set_thread_wstate(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
186 #define get_thread_cwp()                (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
187 #define set_thread_cwp(val)             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
188 #define get_thread_current_ds()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
189 #define set_thread_current_ds(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
190 #define get_thread_fpdepth()            (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
191 #define set_thread_fpdepth(val)         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
192 #define get_thread_wsaved()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
193 #define set_thread_wsaved(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
194
195 #endif /* !(__ASSEMBLY__) */
196
197 /*
198  * Thread information flags, only 16 bits are available as we encode
199  * other values into the upper 6 bytes.
200  *
201  * On trap return we need to test several values:
202  *
203  * user:        need_resched, notify_resume, sigpending, wsaved, perfctr
204  * kernel:      fpdepth
205  *
206  * So to check for work in the kernel case we simply load the fpdepth
207  * byte out of the flags and test it.  For the user case we encode the
208  * lower 3 bytes of flags as follows:
209  *      ----------------------------------------
210  *      | wsaved | flags byte 1 | flags byte 2 |
211  *      ----------------------------------------
212  * This optimizes the user test into:
213  *      ldx             [%g6 + TI_FLAGS], REG1
214  *      sethi           %hi(_TIF_USER_WORK_MASK), REG2
215  *      or              REG2, %lo(_TIF_USER_WORK_MASK), REG2
216  *      andcc           REG1, REG2, %g0
217  *      be,pt           no_work_to_do
218  *       nop
219  */
220 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
221 #define TIF_RESTORE_SIGMASK     1       /* restore signal mask in do_signal() */
222 #define TIF_SIGPENDING          2       /* signal pending */
223 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
224 #define TIF_PERFCTR             4       /* performance counters active */
225 #define TIF_UNALIGNED           5       /* allowed to do unaligned accesses */
226 #define TIF_NEWSIGNALS          6       /* wants new-style signals */
227 #define TIF_32BIT               7       /* 32-bit binary */
228 /* flag bit 8 is available */
229 #define TIF_SECCOMP             9       /* secure computing */
230 #define TIF_SYSCALL_AUDIT       10      /* syscall auditing active */
231 /* flag bit 11 is available */
232 /* NOTE: Thread flags >= 12 should be ones we have no interest
233  *       in using in assembly, else we can't use the mask as
234  *       an immediate value in instructions such as andcc.
235  */
236 #define TIF_ABI_PENDING         12
237 #define TIF_MEMDIE              13
238 #define TIF_POLLING_NRFLAG      14
239
240 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
241 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
242 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
243 #define _TIF_PERFCTR            (1<<TIF_PERFCTR)
244 #define _TIF_UNALIGNED          (1<<TIF_UNALIGNED)
245 #define _TIF_NEWSIGNALS         (1<<TIF_NEWSIGNALS)
246 #define _TIF_32BIT              (1<<TIF_32BIT)
247 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
248 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
249 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
250 #define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
251 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
252
253 #define _TIF_USER_WORK_MASK     ((0xff << TI_FLAG_WSAVED_SHIFT) | \
254                                  (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | \
255                                   _TIF_NEED_RESCHED | _TIF_PERFCTR))
256
257 #endif /* __KERNEL__ */
258
259 #endif /* _ASM_THREAD_INFO_H */