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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 */ |