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1/* 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
12
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 */
28 unsigned long tp_value; /* thread pointer */
29 __u32 cpu; /* current CPU */
30 int preempt_count; /* 0 => preemptable, <0 => BUG */
31
32 mm_segment_t addr_limit; /* thread address space:
33 0-0xBFFFFFFF for user-thead
34 0-0xFFFFFFFF for kernel-thread
35 */
36 struct restart_block restart_block;
37 struct pt_regs *regs;
38};
39
40/*
41 * macros/functions for gaining access to the thread information structure
42 */
43#define INIT_THREAD_INFO(tsk) \
44{ \
45 .task = &tsk, \
46 .exec_domain = &default_exec_domain, \
47 .flags = _TIF_FIXADE, \
48 .cpu = 0, \
49 .preempt_count = INIT_PREEMPT_COUNT, \
50 .addr_limit = KERNEL_DS, \
51 .restart_block = { \
52 .fn = do_no_restart_syscall, \
53 }, \
54}
55
56#define init_thread_info (init_thread_union.thread_info)
57#define init_stack (init_thread_union.stack)
58
59/* How to get the thread information struct from C. */
60register struct thread_info *__current_thread_info __asm__("$28");
61#define current_thread_info() __current_thread_info
62
63/* thread information allocation */
64#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
65#define THREAD_SIZE_ORDER (1)
66#endif
67#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
68#define THREAD_SIZE_ORDER (2)
69#endif
70#ifdef CONFIG_PAGE_SIZE_8KB
71#define THREAD_SIZE_ORDER (1)
72#endif
73#ifdef CONFIG_PAGE_SIZE_16KB
74#define THREAD_SIZE_ORDER (0)
75#endif
76#ifdef CONFIG_PAGE_SIZE_32KB
77#define THREAD_SIZE_ORDER (0)
78#endif
79#ifdef CONFIG_PAGE_SIZE_64KB
80#define THREAD_SIZE_ORDER (0)
81#endif
82
83#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
84#define THREAD_MASK (THREAD_SIZE - 1UL)
85
86#define STACK_WARN (THREAD_SIZE / 8)
87
88#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
89
90#ifdef CONFIG_DEBUG_STACK_USAGE
91#define alloc_thread_info_node(tsk, node) \
92 kzalloc_node(THREAD_SIZE, GFP_KERNEL, node)
93#else
94#define alloc_thread_info_node(tsk, node) \
95 kmalloc_node(THREAD_SIZE, GFP_KERNEL, node)
96#endif
97
98#define free_thread_info(info) kfree(info)
99
100#endif /* !__ASSEMBLY__ */
101
102#define PREEMPT_ACTIVE 0x10000000
103
104/*
105 * thread information flags
106 * - these are process state flags that various assembly files may need to
107 * access
108 * - pending work-to-be-done flags are in LSW
109 * - other flags in MSW
110 */
111#define TIF_SIGPENDING 1 /* signal pending */
112#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
113#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
114#define TIF_SECCOMP 4 /* secure computing */
115#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
116#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
117#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
118#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
119#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
120#define TIF_FREEZE 19
121#define TIF_FIXADE 20 /* Fix address errors in software */
122#define TIF_LOGADE 21 /* Log address errors to syslog */
123#define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */
124#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
125#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
126#define TIF_LOAD_WATCH 25 /* If set, load watch registers */
127#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
128
129#ifdef CONFIG_MIPS32_O32
130#define TIF_32BIT TIF_32BIT_REGS
131#elif defined(CONFIG_MIPS32_N32)
132#define TIF_32BIT _TIF_32BIT_ADDR
133#endif /* CONFIG_MIPS32_O32 */
134
135#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
136#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
137#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
138#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
139#define _TIF_SECCOMP (1<<TIF_SECCOMP)
140#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
141#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
142#define _TIF_USEDFPU (1<<TIF_USEDFPU)
143#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
144#define _TIF_FREEZE (1<<TIF_FREEZE)
145#define _TIF_FIXADE (1<<TIF_FIXADE)
146#define _TIF_LOGADE (1<<TIF_LOGADE)
147#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
148#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
149#define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
150#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
151
152/* work to do in syscall_trace_leave() */
153#define _TIF_WORK_SYSCALL_EXIT (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT)
154
155/* work to do on interrupt/exception return */
156#define _TIF_WORK_MASK (0x0000ffef & \
157 ~(_TIF_SECCOMP | _TIF_SYSCALL_AUDIT))
158/* work to do on any return to u-space */
159#define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP)
160
161#endif /* __KERNEL__ */
162
163#endif /* _ASM_THREAD_INFO_H */
1/* 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
12
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 */
28 unsigned long tp_value; /* thread pointer */
29 __u32 cpu; /* current CPU */
30 int preempt_count; /* 0 => preemptable, <0 => BUG */
31
32 mm_segment_t addr_limit; /*
33 * thread address space limit:
34 * 0x7fffffff for user-thead
35 * 0xffffffff for kernel-thread
36 */
37 struct restart_block restart_block;
38 struct pt_regs *regs;
39};
40
41/*
42 * macros/functions for gaining access to the thread information structure
43 */
44#define INIT_THREAD_INFO(tsk) \
45{ \
46 .task = &tsk, \
47 .exec_domain = &default_exec_domain, \
48 .flags = _TIF_FIXADE, \
49 .cpu = 0, \
50 .preempt_count = INIT_PREEMPT_COUNT, \
51 .addr_limit = KERNEL_DS, \
52 .restart_block = { \
53 .fn = do_no_restart_syscall, \
54 }, \
55}
56
57#define init_thread_info (init_thread_union.thread_info)
58#define init_stack (init_thread_union.stack)
59
60/* How to get the thread information struct from C. */
61static inline struct thread_info *current_thread_info(void)
62{
63 register struct thread_info *__current_thread_info __asm__("$28");
64
65 return __current_thread_info;
66}
67
68#endif /* !__ASSEMBLY__ */
69
70/* thread information allocation */
71#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
72#define THREAD_SIZE_ORDER (1)
73#endif
74#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
75#define THREAD_SIZE_ORDER (2)
76#endif
77#ifdef CONFIG_PAGE_SIZE_8KB
78#define THREAD_SIZE_ORDER (1)
79#endif
80#ifdef CONFIG_PAGE_SIZE_16KB
81#define THREAD_SIZE_ORDER (0)
82#endif
83#ifdef CONFIG_PAGE_SIZE_32KB
84#define THREAD_SIZE_ORDER (0)
85#endif
86#ifdef CONFIG_PAGE_SIZE_64KB
87#define THREAD_SIZE_ORDER (0)
88#endif
89
90#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
91#define THREAD_MASK (THREAD_SIZE - 1UL)
92
93#define STACK_WARN (THREAD_SIZE / 8)
94
95/*
96 * thread information flags
97 * - these are process state flags that various assembly files may need to
98 * access
99 * - pending work-to-be-done flags are in LSW
100 * - other flags in MSW
101 */
102#define TIF_SIGPENDING 1 /* signal pending */
103#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
104#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
105#define TIF_SECCOMP 4 /* secure computing */
106#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
107#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
108#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
109#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
110#define TIF_NOHZ 19 /* in adaptive nohz mode */
111#define TIF_FIXADE 20 /* Fix address errors in software */
112#define TIF_LOGADE 21 /* Log address errors to syslog */
113#define TIF_32BIT_REGS 22 /* 32-bit general purpose registers */
114#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
115#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
116#define TIF_LOAD_WATCH 25 /* If set, load watch registers */
117#define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */
118#define TIF_32BIT_FPREGS 27 /* 32-bit floating point registers */
119#define TIF_USEDMSA 29 /* MSA has been used this quantum */
120#define TIF_MSA_CTX_LIVE 30 /* MSA context must be preserved */
121#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
122
123#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
124#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
125#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
126#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
127#define _TIF_SECCOMP (1<<TIF_SECCOMP)
128#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
129#define _TIF_USEDFPU (1<<TIF_USEDFPU)
130#define _TIF_NOHZ (1<<TIF_NOHZ)
131#define _TIF_FIXADE (1<<TIF_FIXADE)
132#define _TIF_LOGADE (1<<TIF_LOGADE)
133#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
134#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
135#define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
136#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
137#define _TIF_32BIT_FPREGS (1<<TIF_32BIT_FPREGS)
138#define _TIF_USEDMSA (1<<TIF_USEDMSA)
139#define _TIF_MSA_CTX_LIVE (1<<TIF_MSA_CTX_LIVE)
140#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
141
142#define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
143 _TIF_SYSCALL_AUDIT | \
144 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
145
146/* work to do in syscall_trace_leave() */
147#define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
148 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
149
150/* work to do on interrupt/exception return */
151#define _TIF_WORK_MASK \
152 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
153/* work to do on any return to u-space */
154#define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \
155 _TIF_WORK_SYSCALL_EXIT | \
156 _TIF_SYSCALL_TRACEPOINT)
157
158/*
159 * We stash processor id into a COP0 register to retrieve it fast
160 * at kernel exception entry.
161 */
162#if defined(CONFIG_MIPS_MT_SMTC)
163#define SMP_CPUID_REG 2, 2 /* TCBIND */
164#define ASM_SMP_CPUID_REG $2, 2
165#define SMP_CPUID_PTRSHIFT 19
166#elif defined(CONFIG_MIPS_PGD_C0_CONTEXT)
167#define SMP_CPUID_REG 20, 0 /* XCONTEXT */
168#define ASM_SMP_CPUID_REG $20
169#define SMP_CPUID_PTRSHIFT 48
170#else
171#define SMP_CPUID_REG 4, 0 /* CONTEXT */
172#define ASM_SMP_CPUID_REG $4
173#define SMP_CPUID_PTRSHIFT 23
174#endif
175
176#ifdef CONFIG_64BIT
177#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3)
178#else
179#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2)
180#endif
181
182#ifdef CONFIG_MIPS_MT_SMTC
183#define ASM_CPUID_MFC0 mfc0
184#define UASM_i_CPUID_MFC0 uasm_i_mfc0
185#else
186#define ASM_CPUID_MFC0 MFC0
187#define UASM_i_CPUID_MFC0 UASM_i_MFC0
188#endif
189
190#endif /* __KERNEL__ */
191#endif /* _ASM_THREAD_INFO_H */