fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-sparc64 / thread_info.h
blob98252cd44dd6db88b3f91367b94c36f4e8d4bae1
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)
5 */
7 #ifndef _ASM_THREAD_INFO_H
8 #define _ASM_THREAD_INFO_H
10 #ifdef __KERNEL__
12 #define NSWINS 7
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
27 #include <asm/page.h>
29 #ifndef __ASSEMBLY__
31 #include <asm/ptrace.h>
32 #include <asm/types.h>
34 struct task_struct;
35 struct exec_domain;
37 struct 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;
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;
54 unsigned long *utraps;
56 struct reg_window reg_window[NSWINS];
57 unsigned long rwbuf_stkptrs[NSWINS];
59 unsigned long gsr[7];
60 unsigned long xfsr[7];
62 __u64 __user *user_cntd0;
63 __u64 __user *user_cntd1;
64 __u64 kernel_cntd0, kernel_cntd1;
65 __u64 pcr_reg;
67 struct restart_block restart_block;
69 struct pt_regs *kern_una_regs;
70 unsigned int kern_una_insn;
72 unsigned long fpregs[0] __attribute__ ((aligned(64)));
75 #endif /* !(__ASSEMBLY__) */
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
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 */
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 */
125 #define PREEMPT_ACTIVE 0x4000000
128 * macros/functions for gaining access to the thread information structure
130 * preempt_count needs to be 1 initially, until the scheduler is functional.
132 #ifndef __ASSEMBLY__
134 #define INIT_THREAD_INFO(tsk) \
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 }, \
145 #define init_thread_info (init_thread_union.thread_info)
146 #define init_stack (init_thread_union.stack)
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)
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 */
159 #ifdef CONFIG_DEBUG_STACK_USAGE
160 #define alloc_thread_info(tsk) \
161 ({ \
162 struct thread_info *ret; \
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; \
170 #else
171 #define alloc_thread_info(tsk) \
172 ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
173 #endif
175 #define free_thread_info(ti) \
176 free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
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())
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))
195 #endif /* !(__ASSEMBLY__) */
198 * Thread information flags, only 16 bits are available as we encode
199 * other values into the upper 6 bytes.
201 * On trap return we need to test several values:
203 * user: need_resched, notify_resume, sigpending, wsaved, perfctr
204 * kernel: fpdepth
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
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.
236 #define TIF_ABI_PENDING 12
237 #define TIF_MEMDIE 13
238 #define TIF_POLLING_NRFLAG 14
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)
253 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
254 (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | \
255 _TIF_NEED_RESCHED | _TIF_PERFCTR))
257 #endif /* __KERNEL__ */
259 #endif /* _ASM_THREAD_INFO_H */