1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* thread_info.h: MIPS low-level thread information
3 *
4 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
6 */
7
8 #ifndef _ASM_THREAD_INFO_H
9 #define _ASM_THREAD_INFO_H
10
11 #ifdef __KERNEL__
12
13
14 #ifndef __ASSEMBLY__
15
16 #include <asm/processor.h>
17
18 /*
19 * low level task data that entry.S needs immediate access to
20 * - this struct should fit entirely inside of one cache line
21 * - this struct shares the supervisor stack pages
22 * - if the contents of this structure are changed, the assembly constants
23 * must also be changed
24 */
25 struct thread_info {
26 struct task_struct *task; /* main task structure */
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 mm_segment_t addr_limit; /*
32 * thread address space limit:
33 * 0x7fffffff for user-thead
34 * 0xffffffff for kernel-thread
35 */
36 struct pt_regs *regs;
37 long syscall; /* syscall number */
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 .flags = _TIF_FIXADE, \
47 .cpu = 0, \
48 .preempt_count = INIT_PREEMPT_COUNT, \
49 .addr_limit = KERNEL_DS, \
50 }
51
52 /* How to get the thread information struct from C. */
53 register struct thread_info *__current_thread_info __asm__("$28");
54
current_thread_info(void)55 static inline struct thread_info *current_thread_info(void)
56 {
57 return __current_thread_info;
58 }
59
60 #endif /* !__ASSEMBLY__ */
61
62 /* thread information allocation */
63 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
64 #define THREAD_SIZE_ORDER (1)
65 #endif
66 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
67 #define THREAD_SIZE_ORDER (2)
68 #endif
69 #ifdef CONFIG_PAGE_SIZE_8KB
70 #define THREAD_SIZE_ORDER (1)
71 #endif
72 #ifdef CONFIG_PAGE_SIZE_16KB
73 #define THREAD_SIZE_ORDER (0)
74 #endif
75 #ifdef CONFIG_PAGE_SIZE_32KB
76 #define THREAD_SIZE_ORDER (0)
77 #endif
78 #ifdef CONFIG_PAGE_SIZE_64KB
79 #define THREAD_SIZE_ORDER (0)
80 #endif
81
82 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
83 #define THREAD_MASK (THREAD_SIZE - 1UL)
84
85 #define STACK_WARN (THREAD_SIZE / 8)
86
87 /*
88 * thread information flags
89 * - these are process state flags that various assembly files may need to
90 * access
91 * - pending work-to-be-done flags are in LSW
92 * - other flags in MSW
93 */
94 #define TIF_SIGPENDING 1 /* signal pending */
95 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
96 #define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
97 #define TIF_SECCOMP 4 /* secure computing */
98 #define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
99 #define TIF_UPROBE 6 /* breakpointed or singlestepping */
100 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
101 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
102 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
103 #define TIF_NOHZ 19 /* in adaptive nohz mode */
104 #define TIF_FIXADE 20 /* Fix address errors in software */
105 #define TIF_LOGADE 21 /* Log address errors to syslog */
106 #define TIF_32BIT_REGS 22 /* 32-bit general purpose registers */
107 #define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
108 #define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
109 #define TIF_LOAD_WATCH 25 /* If set, load watch registers */
110 #define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */
111 #define TIF_32BIT_FPREGS 27 /* 32-bit floating point registers */
112 #define TIF_HYBRID_FPREGS 28 /* 64b FP registers, odd singles in bits 63:32 of even doubles */
113 #define TIF_USEDMSA 29 /* MSA has been used this quantum */
114 #define TIF_MSA_CTX_LIVE 30 /* MSA context must be preserved */
115 #define TIF_SYSCALL_TRACE 31 /* syscall trace active */
116
117 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
118 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
119 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
120 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
121 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
122 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
123 #define _TIF_UPROBE (1<<TIF_UPROBE)
124 #define _TIF_USEDFPU (1<<TIF_USEDFPU)
125 #define _TIF_NOHZ (1<<TIF_NOHZ)
126 #define _TIF_FIXADE (1<<TIF_FIXADE)
127 #define _TIF_LOGADE (1<<TIF_LOGADE)
128 #define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
129 #define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
130 #define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
131 #define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
132 #define _TIF_32BIT_FPREGS (1<<TIF_32BIT_FPREGS)
133 #define _TIF_HYBRID_FPREGS (1<<TIF_HYBRID_FPREGS)
134 #define _TIF_USEDMSA (1<<TIF_USEDMSA)
135 #define _TIF_MSA_CTX_LIVE (1<<TIF_MSA_CTX_LIVE)
136 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
137
138 #define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
139 _TIF_SYSCALL_AUDIT | \
140 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
141
142 /* work to do in syscall_trace_leave() */
143 #define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
144 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
145
146 /* work to do on interrupt/exception return */
147 #define _TIF_WORK_MASK \
148 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME | \
149 _TIF_UPROBE)
150 /* work to do on any return to u-space */
151 #define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \
152 _TIF_WORK_SYSCALL_EXIT | \
153 _TIF_SYSCALL_TRACEPOINT)
154
155 /*
156 * We stash processor id into a COP0 register to retrieve it fast
157 * at kernel exception entry.
158 */
159 #if defined(CONFIG_MIPS_PGD_C0_CONTEXT)
160 #define SMP_CPUID_REG 20, 0 /* XCONTEXT */
161 #define ASM_SMP_CPUID_REG $20
162 #define SMP_CPUID_PTRSHIFT 48
163 #else
164 #define SMP_CPUID_REG 4, 0 /* CONTEXT */
165 #define ASM_SMP_CPUID_REG $4
166 #define SMP_CPUID_PTRSHIFT 23
167 #endif
168
169 #ifdef CONFIG_64BIT
170 #define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3)
171 #else
172 #define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2)
173 #endif
174
175 #define ASM_CPUID_MFC0 MFC0
176 #define UASM_i_CPUID_MFC0 UASM_i_MFC0
177
178 #endif /* __KERNEL__ */
179 #endif /* _ASM_THREAD_INFO_H */
180
