blob: e4440f92b366f7a1d90e4af10dd2477acdf0223a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* thread_info.h: MIPS low-level thread information
2 *
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
5 */
6
7#ifndef _ASM_THREAD_INFO_H
8#define _ASM_THREAD_INFO_H
9
10#ifdef __KERNEL__
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012
13#ifndef __ASSEMBLY__
14
15#include <asm/processor.h>
16
17/*
18 * low level task data that entry.S needs immediate access to
19 * - this struct should fit entirely inside of one cache line
20 * - this struct shares the supervisor stack pages
21 * - if the contents of this structure are changed, the assembly constants
22 * must also be changed
23 */
24struct thread_info {
25 struct task_struct *task; /* main task structure */
26 struct exec_domain *exec_domain; /* execution domain */
27 unsigned long flags; /* low level flags */
Ralf Baechle3c370262005-04-13 17:43:59 +000028 unsigned long tp_value; /* thread pointer */
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 __u32 cpu; /* current CPU */
Jesper Juhldcd497f2005-06-23 00:09:07 -070030 int preempt_count; /* 0 => preemptable, <0 => BUG */
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
Ralf Baechle02637b82012-12-20 15:49:36 +010032 mm_segment_t addr_limit; /*
33 * thread address space limit:
34 * 0x7fffffff for user-thead
35 * 0xffffffff for kernel-thread
36 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 struct restart_block restart_block;
Ralf Baechle937a8012006-10-07 19:44:33 +010038 struct pt_regs *regs;
Lars Perssonc2d9f172015-02-03 17:08:17 +010039 long syscall; /* syscall number */
Linus Torvalds1da177e2005-04-16 15:20:36 -070040};
41
42/*
43 * macros/functions for gaining access to the thread information structure
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 */
45#define INIT_THREAD_INFO(tsk) \
46{ \
47 .task = &tsk, \
Ralf Baechle70342282013-01-22 12:59:30 +010048 .exec_domain = &default_exec_domain, \
Ralf Baechle293c5bd2007-07-25 16:19:33 +010049 .flags = _TIF_FIXADE, \
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 .cpu = 0, \
Peter Zijlstrac99e6ef2009-07-10 14:57:56 +020051 .preempt_count = INIT_PREEMPT_COUNT, \
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 .addr_limit = KERNEL_DS, \
53 .restart_block = { \
54 .fn = do_no_restart_syscall, \
55 }, \
56}
57
58#define init_thread_info (init_thread_union.thread_info)
59#define init_stack (init_thread_union.stack)
60
61/* How to get the thread information struct from C. */
Ralf Baechlead04c2e2013-02-08 01:02:42 +010062static inline struct thread_info *current_thread_info(void)
63{
64 register struct thread_info *__current_thread_info __asm__("$28");
65
66 return __current_thread_info;
67}
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
David Daney7b1c0d22012-07-19 09:11:14 +020069#endif /* !__ASSEMBLY__ */
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071/* thread information allocation */
Ralf Baechle875d43e2005-09-03 15:56:16 -070072#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073#define THREAD_SIZE_ORDER (1)
74#endif
Ralf Baechle875d43e2005-09-03 15:56:16 -070075#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#define THREAD_SIZE_ORDER (2)
77#endif
78#ifdef CONFIG_PAGE_SIZE_8KB
79#define THREAD_SIZE_ORDER (1)
80#endif
81#ifdef CONFIG_PAGE_SIZE_16KB
82#define THREAD_SIZE_ORDER (0)
83#endif
Ralf Baechlec52399b2009-04-02 14:07:10 +020084#ifdef CONFIG_PAGE_SIZE_32KB
85#define THREAD_SIZE_ORDER (0)
86#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070087#ifdef CONFIG_PAGE_SIZE_64KB
88#define THREAD_SIZE_ORDER (0)
89#endif
90
91#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
92#define THREAD_MASK (THREAD_SIZE - 1UL)
93
From: jiang.adam@gmail.com334c86c2010-08-27 18:32:06 +090094#define STACK_WARN (THREAD_SIZE / 8)
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096/*
97 * thread information flags
98 * - these are process state flags that various assembly files may need to
99 * access
100 * - pending work-to-be-done flags are in LSW
101 * - other flags in MSW
102 */
Stephane Eraniana583f1b2007-07-31 00:38:00 -0700103#define TIF_SIGPENDING 1 /* signal pending */
104#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
105#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
106#define TIF_SECCOMP 4 /* secure computing */
David Howellsd0420c82009-09-02 09:14:16 +0100107#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
Ralf Baechle7b3e2fc2006-02-08 12:58:41 +0000108#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
Andreas Dilger0ddc9322010-05-14 11:13:27 +0200110#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
Ralf Baechlec3fc5cd2013-05-29 01:07:19 +0200111#define TIF_NOHZ 19 /* in adaptive nohz mode */
Ralf Baechle293c5bd2007-07-25 16:19:33 +0100112#define TIF_FIXADE 20 /* Fix address errors in software */
113#define TIF_LOGADE 21 /* Log address errors to syslog */
Paul Burton597ce172013-11-22 13:12:07 +0000114#define TIF_32BIT_REGS 22 /* 32-bit general purpose registers */
Ralf Baechle293c5bd2007-07-25 16:19:33 +0100115#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
116#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
David Daney6aa35242008-09-23 00:05:54 -0700117#define TIF_LOAD_WATCH 25 /* If set, load watch registers */
Ralf Baechle1d7bf992013-09-06 20:24:48 +0200118#define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */
Paul Burton597ce172013-11-22 13:12:07 +0000119#define TIF_32BIT_FPREGS 27 /* 32-bit floating point registers */
Paul Burton4227a2d2014-09-11 08:30:20 +0100120#define TIF_HYBRID_FPREGS 28 /* 64b FP registers, odd singles in bits 63:32 of even doubles */
Paul Burton1db1af82014-01-27 15:23:11 +0000121#define TIF_USEDMSA 29 /* MSA has been used this quantum */
122#define TIF_MSA_CTX_LIVE 30 /* MSA context must be preserved */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
124
125#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
127#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
128#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
Ralf Baechle127c6f62005-03-18 17:36:42 +0000129#define _TIF_SECCOMP (1<<TIF_SECCOMP)
David Howellsd0420c82009-09-02 09:14:16 +0100130#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131#define _TIF_USEDFPU (1<<TIF_USEDFPU)
Ralf Baechlec3fc5cd2013-05-29 01:07:19 +0200132#define _TIF_NOHZ (1<<TIF_NOHZ)
Ralf Baechle293c5bd2007-07-25 16:19:33 +0100133#define _TIF_FIXADE (1<<TIF_FIXADE)
134#define _TIF_LOGADE (1<<TIF_LOGADE)
135#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
136#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
137#define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
David Daney6aa35242008-09-23 00:05:54 -0700138#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
Paul Burton597ce172013-11-22 13:12:07 +0000139#define _TIF_32BIT_FPREGS (1<<TIF_32BIT_FPREGS)
Paul Burton4227a2d2014-09-11 08:30:20 +0100140#define _TIF_HYBRID_FPREGS (1<<TIF_HYBRID_FPREGS)
Paul Burton1db1af82014-01-27 15:23:11 +0000141#define _TIF_USEDMSA (1<<TIF_USEDMSA)
142#define _TIF_MSA_CTX_LIVE (1<<TIF_MSA_CTX_LIVE)
Ralf Baechle1d7bf992013-09-06 20:24:48 +0200143#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
Ralf Baechlec3fc5cd2013-05-29 01:07:19 +0200145#define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
Markos Chandras137f7df2014-01-22 14:40:00 +0000146 _TIF_SYSCALL_AUDIT | \
147 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
Ralf Baechlee7f3b482013-05-29 01:02:18 +0200148
Ralf Baechlec19c20a2011-05-19 09:21:28 +0100149/* work to do in syscall_trace_leave() */
Ralf Baechlec3fc5cd2013-05-29 01:07:19 +0200150#define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
Ralf Baechle1d7bf992013-09-06 20:24:48 +0200151 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
Ralf Baechlec19c20a2011-05-19 09:21:28 +0100152
Ralf Baechle127c6f62005-03-18 17:36:42 +0000153/* work to do on interrupt/exception return */
Al Virof9257252012-05-05 15:57:00 -0400154#define _TIF_WORK_MASK \
Al Viroac19fe52012-05-05 16:24:40 -0400155 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
Ralf Baechle127c6f62005-03-18 17:36:42 +0000156/* work to do on any return to u-space */
Ralf Baechlec3fc5cd2013-05-29 01:07:19 +0200157#define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \
Ralf Baechle1d7bf992013-09-06 20:24:48 +0200158 _TIF_WORK_SYSCALL_EXIT | \
159 _TIF_SYSCALL_TRACEPOINT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Jayachandran Cc2377a42013-08-11 17:10:16 +0530161/*
162 * We stash processor id into a COP0 register to retrieve it fast
163 * at kernel exception entry.
164 */
Ralf Baechleb633648c52014-05-23 16:29:44 +0200165#if defined(CONFIG_MIPS_PGD_C0_CONTEXT)
Jayachandran Cc2377a42013-08-11 17:10:16 +0530166#define SMP_CPUID_REG 20, 0 /* XCONTEXT */
167#define ASM_SMP_CPUID_REG $20
168#define SMP_CPUID_PTRSHIFT 48
169#else
170#define SMP_CPUID_REG 4, 0 /* CONTEXT */
171#define ASM_SMP_CPUID_REG $4
172#define SMP_CPUID_PTRSHIFT 23
173#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Jayachandran Cc2377a42013-08-11 17:10:16 +0530175#ifdef CONFIG_64BIT
176#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3)
177#else
178#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2)
179#endif
180
Jayachandran Cc2377a42013-08-11 17:10:16 +0530181#define ASM_CPUID_MFC0 MFC0
182#define UASM_i_CPUID_MFC0 UASM_i_MFC0
Jayachandran Cc2377a42013-08-11 17:10:16 +0530183
184#endif /* __KERNEL__ */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185#endif /* _ASM_THREAD_INFO_H */