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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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 unsigned long flags; /* low level flags */
Ralf Baechle3c370262005-04-13 17:43:59 +000027 unsigned long tp_value; /* thread pointer */
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 __u32 cpu; /* current CPU */
Jesper Juhldcd497f2005-06-23 00:09:07 -070029 int preempt_count; /* 0 => preemptable, <0 => BUG */
Markos Chandras7c151d32014-12-03 12:37:32 +000030 int r2_emul_return; /* 1 => Returning from R2 emulator */
Ralf Baechle02637b82012-12-20 15:49:36 +010031 mm_segment_t addr_limit; /*
32 * thread address space limit:
33 * 0x7fffffff for user-thead
34 * 0xffffffff for kernel-thread
35 */
Ralf Baechle937a8012006-10-07 19:44:33 +010036 struct pt_regs *regs;
Lars Perssonc2d9f172015-02-03 17:08:17 +010037 long syscall; /* syscall number */
Linus Torvalds1da177e2005-04-16 15:20:36 -070038};
39
40/*
41 * macros/functions for gaining access to the thread information structure
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 */
43#define INIT_THREAD_INFO(tsk) \
44{ \
45 .task = &tsk, \
Ralf Baechle293c5bd2007-07-25 16:19:33 +010046 .flags = _TIF_FIXADE, \
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 .cpu = 0, \
Peter Zijlstrac99e6ef2009-07-10 14:57:56 +020048 .preempt_count = INIT_PREEMPT_COUNT, \
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 .addr_limit = KERNEL_DS, \
Linus Torvalds1da177e2005-04-16 15:20:36 -070050}
51
52#define init_thread_info (init_thread_union.thread_info)
53#define init_stack (init_thread_union.stack)
54
55/* How to get the thread information struct from C. */
Daniel Sandersfe92da02015-02-24 15:02:57 +000056register struct thread_info *__current_thread_info __asm__("$28");
57
Ralf Baechlead04c2e2013-02-08 01:02:42 +010058static inline struct thread_info *current_thread_info(void)
59{
Ralf Baechlead04c2e2013-02-08 01:02:42 +010060 return __current_thread_info;
61}
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
David Daney7b1c0d22012-07-19 09:11:14 +020063#endif /* !__ASSEMBLY__ */
64
Linus Torvalds1da177e2005-04-16 15:20:36 -070065/* thread information allocation */
Ralf Baechle875d43e2005-09-03 15:56:16 -070066#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#define THREAD_SIZE_ORDER (1)
68#endif
Ralf Baechle875d43e2005-09-03 15:56:16 -070069#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#define THREAD_SIZE_ORDER (2)
71#endif
72#ifdef CONFIG_PAGE_SIZE_8KB
73#define THREAD_SIZE_ORDER (1)
74#endif
75#ifdef CONFIG_PAGE_SIZE_16KB
76#define THREAD_SIZE_ORDER (0)
77#endif
Ralf Baechlec52399b2009-04-02 14:07:10 +020078#ifdef CONFIG_PAGE_SIZE_32KB
79#define THREAD_SIZE_ORDER (0)
80#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#ifdef CONFIG_PAGE_SIZE_64KB
82#define THREAD_SIZE_ORDER (0)
83#endif
84
85#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
86#define THREAD_MASK (THREAD_SIZE - 1UL)
87
From: jiang.adam@gmail.com334c86c2010-08-27 18:32:06 +090088#define STACK_WARN (THREAD_SIZE / 8)
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090/*
91 * thread information flags
92 * - these are process state flags that various assembly files may need to
93 * access
94 * - pending work-to-be-done flags are in LSW
95 * - other flags in MSW
96 */
Stephane Eraniana583f1b2007-07-31 00:38:00 -070097#define TIF_SIGPENDING 1 /* signal pending */
98#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
99#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
100#define TIF_SECCOMP 4 /* secure computing */
David Howellsd0420c82009-09-02 09:14:16 +0100101#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
Ralf Baechle40e084a2015-07-29 22:44:53 +0200102#define TIF_UPROBE 6 /* breakpointed or singlestepping */
Ralf Baechle7b3e2fc2006-02-08 12:58:41 +0000103#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
Andreas Dilger0ddc9322010-05-14 11:13:27 +0200105#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
Ralf Baechlec3fc5cd2013-05-29 01:07:19 +0200106#define TIF_NOHZ 19 /* in adaptive nohz mode */
Ralf Baechle293c5bd2007-07-25 16:19:33 +0100107#define TIF_FIXADE 20 /* Fix address errors in software */
108#define TIF_LOGADE 21 /* Log address errors to syslog */
Paul Burton597ce172013-11-22 13:12:07 +0000109#define TIF_32BIT_REGS 22 /* 32-bit general purpose registers */
Ralf Baechle293c5bd2007-07-25 16:19:33 +0100110#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
111#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
David Daney6aa35242008-09-23 00:05:54 -0700112#define TIF_LOAD_WATCH 25 /* If set, load watch registers */
Ralf Baechle1d7bf992013-09-06 20:24:48 +0200113#define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */
Paul Burton597ce172013-11-22 13:12:07 +0000114#define TIF_32BIT_FPREGS 27 /* 32-bit floating point registers */
Paul Burton4227a2d2014-09-11 08:30:20 +0100115#define TIF_HYBRID_FPREGS 28 /* 64b FP registers, odd singles in bits 63:32 of even doubles */
Paul Burton1db1af82014-01-27 15:23:11 +0000116#define TIF_USEDMSA 29 /* MSA has been used this quantum */
117#define TIF_MSA_CTX_LIVE 30 /* MSA context must be preserved */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
119
120#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
122#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
123#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
Ralf Baechle127c6f62005-03-18 17:36:42 +0000124#define _TIF_SECCOMP (1<<TIF_SECCOMP)
David Howellsd0420c82009-09-02 09:14:16 +0100125#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
Ralf Baechle40e084a2015-07-29 22:44:53 +0200126#define _TIF_UPROBE (1<<TIF_UPROBE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127#define _TIF_USEDFPU (1<<TIF_USEDFPU)
Ralf Baechlec3fc5cd2013-05-29 01:07:19 +0200128#define _TIF_NOHZ (1<<TIF_NOHZ)
Ralf Baechle293c5bd2007-07-25 16:19:33 +0100129#define _TIF_FIXADE (1<<TIF_FIXADE)
130#define _TIF_LOGADE (1<<TIF_LOGADE)
131#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
132#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
133#define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
David Daney6aa35242008-09-23 00:05:54 -0700134#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
Paul Burton597ce172013-11-22 13:12:07 +0000135#define _TIF_32BIT_FPREGS (1<<TIF_32BIT_FPREGS)
Paul Burton4227a2d2014-09-11 08:30:20 +0100136#define _TIF_HYBRID_FPREGS (1<<TIF_HYBRID_FPREGS)
Paul Burton1db1af82014-01-27 15:23:11 +0000137#define _TIF_USEDMSA (1<<TIF_USEDMSA)
138#define _TIF_MSA_CTX_LIVE (1<<TIF_MSA_CTX_LIVE)
Ralf Baechle1d7bf992013-09-06 20:24:48 +0200139#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Ralf Baechlec3fc5cd2013-05-29 01:07:19 +0200141#define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
Markos Chandras137f7df2014-01-22 14:40:00 +0000142 _TIF_SYSCALL_AUDIT | \
143 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
Ralf Baechlee7f3b482013-05-29 01:02:18 +0200144
Ralf Baechlec19c20a2011-05-19 09:21:28 +0100145/* work to do in syscall_trace_leave() */
Ralf Baechlec3fc5cd2013-05-29 01:07:19 +0200146#define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
Ralf Baechle1d7bf992013-09-06 20:24:48 +0200147 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
Ralf Baechlec19c20a2011-05-19 09:21:28 +0100148
Ralf Baechle127c6f62005-03-18 17:36:42 +0000149/* work to do on interrupt/exception return */
Al Virof9257252012-05-05 15:57:00 -0400150#define _TIF_WORK_MASK \
Ralf Baechle40e084a2015-07-29 22:44:53 +0200151 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME | \
152 _TIF_UPROBE)
Ralf Baechle127c6f62005-03-18 17:36:42 +0000153/* work to do on any return to u-space */
Ralf Baechlec3fc5cd2013-05-29 01:07:19 +0200154#define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \
Ralf Baechle1d7bf992013-09-06 20:24:48 +0200155 _TIF_WORK_SYSCALL_EXIT | \
156 _TIF_SYSCALL_TRACEPOINT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Jayachandran Cc2377a42013-08-11 17:10:16 +0530158/*
159 * We stash processor id into a COP0 register to retrieve it fast
160 * at kernel exception entry.
161 */
Ralf Baechleb633648c52014-05-23 16:29:44 +0200162#if defined(CONFIG_MIPS_PGD_C0_CONTEXT)
Jayachandran Cc2377a42013-08-11 17:10:16 +0530163#define SMP_CPUID_REG 20, 0 /* XCONTEXT */
164#define ASM_SMP_CPUID_REG $20
165#define SMP_CPUID_PTRSHIFT 48
166#else
167#define SMP_CPUID_REG 4, 0 /* CONTEXT */
168#define ASM_SMP_CPUID_REG $4
169#define SMP_CPUID_PTRSHIFT 23
170#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Jayachandran Cc2377a42013-08-11 17:10:16 +0530172#ifdef CONFIG_64BIT
173#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3)
174#else
175#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2)
176#endif
177
Jayachandran Cc2377a42013-08-11 17:10:16 +0530178#define ASM_CPUID_MFC0 MFC0
179#define UASM_i_CPUID_MFC0 UASM_i_MFC0
Jayachandran Cc2377a42013-08-11 17:10:16 +0530180
181#endif /* __KERNEL__ */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182#endif /* _ASM_THREAD_INFO_H */