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
4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
7 #ifndef _ASM_THREAD_INFO_H
8 #define _ASM_THREAD_INFO_H
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
31 #include <asm/ptrace.h>
32 #include <asm/types.h>
39 struct task_struct *task;
46 unsigned long fault_address;
47 struct pt_regs *kregs;
48 struct exec_domain *exec_domain;
51 unsigned long *utraps;
53 struct reg_window reg_window[NSWINS];
54 unsigned long rwbuf_stkptrs[NSWINS];
57 unsigned long xfsr[7];
59 __u64 *user_cntd0, *user_cntd1;
60 __u64 kernel_cntd0, kernel_cntd1;
65 struct restart_block restart_block;
67 unsigned long fpregs[0] __attribute__ ((aligned(64)));
70 #endif /* !(__ASSEMBLY__) */
72 /* offsets into the thread_info struct for assembly code access */
73 #define TI_TASK 0x00000000
74 #define TI_FLAGS 0x00000008
75 #define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
76 #define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
77 #define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
78 #define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
79 #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
80 #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
81 #define TI_CPU 0x00000010
82 #define TI_FPSAVED 0x00000011
83 #define TI_KSP 0x00000018
84 #define TI_FAULT_ADDR 0x00000020
85 #define TI_KREGS 0x00000028
86 #define TI_EXEC_DOMAIN 0x00000030
87 #define TI_PRE_COUNT 0x00000038
88 #define TI_UTRAPS 0x00000040
89 #define TI_REG_WINDOW 0x00000048
90 #define TI_RWIN_SPTRS 0x000003c8
91 #define TI_GSR 0x00000400
92 #define TI_XFSR 0x00000438
93 #define TI_USER_CNTD0 0x00000470
94 #define TI_USER_CNTD1 0x00000478
95 #define TI_KERN_CNTD0 0x00000480
96 #define TI_KERN_CNTD1 0x00000488
97 #define TI_PCR 0x00000490
98 #define TI_CEE_STUFF 0x00000498
99 #define TI_RESTART_BLOCK 0x000004a0
100 #define TI_FPREGS 0x00000500
102 /* We embed this in the uppermost byte of thread_info->flags */
103 #define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
104 #define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
105 #define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
106 #define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
109 #define THREAD_SIZE (2*PAGE_SIZE)
110 #define THREAD_SHIFT (PAGE_SHIFT + 1)
111 #else /* PAGE_SHIFT == 13 */
112 #define THREAD_SIZE PAGE_SIZE
113 #define THREAD_SHIFT PAGE_SHIFT
114 #endif /* PAGE_SHIFT == 13 */
116 #define PREEMPT_ACTIVE 0x4000000
119 * macros/functions for gaining access to the thread information structure
121 * preempt_count needs to be 1 initially, until the scheduler is functional.
125 #define INIT_THREAD_INFO(tsk) \
128 .flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \
129 .exec_domain = &default_exec_domain, \
130 .preempt_count = 1, \
132 .fn = do_no_restart_syscall, \
136 #define init_thread_info (init_thread_union.thread_info)
137 #define init_stack (init_thread_union.stack)
139 /* how to get the thread information struct from C */
140 register struct thread_info *current_thread_info_reg asm("g6");
141 #define current_thread_info() (current_thread_info_reg)
143 /* thread information allocation */
145 #define __THREAD_INFO_ORDER 1
146 #else /* PAGE_SHIFT == 13 */
147 #define __THREAD_INFO_ORDER 0
148 #endif /* PAGE_SHIFT == 13 */
150 #ifdef CONFIG_DEBUG_STACK_USAGE
151 #define alloc_thread_info(tsk) \
153 struct thread_info *ret; \
155 ret = (struct thread_info *) \
156 __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER); \
158 memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
162 #define alloc_thread_info(tsk) \
163 ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
166 #define free_thread_info(ti) \
167 free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
169 #define __thread_flag_byte_ptr(ti) \
170 ((unsigned char *)(&((ti)->flags)))
171 #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
173 #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
174 #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
175 #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
176 #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
177 #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
178 #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
179 #define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
180 #define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
181 #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
182 #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
183 #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
184 #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
186 #endif /* !(__ASSEMBLY__) */
189 * Thread information flags, only 16 bits are available as we encode
190 * other values into the upper 6 bytes.
192 * On trap return we need to test several values:
194 * user: need_resched, notify_resume, sigpending, wsaved, perfctr
197 * So to check for work in the kernel case we simply load the fpdepth
198 * byte out of the flags and test it. For the user case we encode the
199 * lower 3 bytes of flags as follows:
200 * ----------------------------------------
201 * | wsaved | flags byte 1 | flags byte 2 |
202 * ----------------------------------------
203 * This optimizes the user test into:
204 * ldx [%g6 + TI_FLAGS], REG1
205 * sethi %hi(_TIF_USER_WORK_MASK), REG2
206 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2
207 * andcc REG1, REG2, %g0
208 * be,pt no_work_to_do
211 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
212 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
213 #define TIF_SIGPENDING 2 /* signal pending */
214 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
215 #define TIF_PERFCTR 4 /* performance counters active */
216 #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
217 #define TIF_NEWSIGNALS 6 /* wants new-style signals */
218 #define TIF_32BIT 7 /* 32-bit binary */
219 #define TIF_NEWCHILD 8 /* just-spawned child process */
221 /* XXX Make this one FAULT_CODE_BLKCOMMIT XXX */
222 #define TIF_BLKCOMMIT 9 /* use ASI_BLK_COMMIT_* in copy_user_page */
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.
230 #define TIF_ABI_PENDING 12
232 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
233 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
234 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
235 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
236 #define _TIF_PERFCTR (1<<TIF_PERFCTR)
237 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
238 #define _TIF_NEWSIGNALS (1<<TIF_NEWSIGNALS)
239 #define _TIF_32BIT (1<<TIF_32BIT)
240 #define _TIF_NEWCHILD (1<<TIF_NEWCHILD)
241 #define _TIF_BLKCOMMIT (1<<TIF_BLKCOMMIT)
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)
246 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
247 (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
248 _TIF_NEED_RESCHED | _TIF_PERFCTR))
250 #endif /* __KERNEL__ */
252 #endif /* _ASM_THREAD_INFO_H */