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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
34struct task_struct;
35struct exec_domain;
36
37struct thread_info {
38 /* D$ line 1 */
39 struct task_struct *task;
40 unsigned long flags;
41 __u8 fpsaved[7];
42 __u8 pad;
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 cpu;
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_FPSAVED 0x00000010
87#define TI_KSP 0x00000018
88#define TI_FAULT_ADDR 0x00000020
89#define TI_KREGS 0x00000028
90#define TI_EXEC_DOMAIN 0x00000030
91#define TI_PRE_COUNT 0x00000038
92#define TI_NEW_CHILD 0x0000003c
93#define TI_SYS_NOERROR 0x0000003d
94#define TI_CPU 0x0000003e
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 */
149register 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 */