1 /* thread_info.h: MIPS low-level thread information
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
7 #ifndef _ASM_THREAD_INFO_H
8 #define _ASM_THREAD_INFO_H
15 #include <asm/processor.h>
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
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 */
32 mm_segment_t addr_limit; /*
33 * thread address space limit:
34 * 0x7fffffff for user-thead
35 * 0xffffffff for kernel-thread
37 struct restart_block restart_block;
42 * macros/functions for gaining access to the thread information structure
44 #define INIT_THREAD_INFO(tsk) \
47 .exec_domain = &default_exec_domain, \
48 .flags = _TIF_FIXADE, \
50 .preempt_count = INIT_PREEMPT_COUNT, \
51 .addr_limit = KERNEL_DS, \
53 .fn = do_no_restart_syscall, \
57 #define init_thread_info (init_thread_union.thread_info)
58 #define init_stack (init_thread_union.stack)
60 /* How to get the thread information struct from C. */
61 static inline struct thread_info *current_thread_info(void)
63 register struct thread_info *__current_thread_info __asm__("$28");
65 return __current_thread_info;
68 #endif /* !__ASSEMBLY__ */
70 /* thread information allocation */
71 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
72 #define THREAD_SIZE_ORDER (1)
74 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
75 #define THREAD_SIZE_ORDER (2)
77 #ifdef CONFIG_PAGE_SIZE_8KB
78 #define THREAD_SIZE_ORDER (1)
80 #ifdef CONFIG_PAGE_SIZE_16KB
81 #define THREAD_SIZE_ORDER (0)
83 #ifdef CONFIG_PAGE_SIZE_32KB
84 #define THREAD_SIZE_ORDER (0)
86 #ifdef CONFIG_PAGE_SIZE_64KB
87 #define THREAD_SIZE_ORDER (0)
90 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
91 #define THREAD_MASK (THREAD_SIZE - 1UL)
93 #define STACK_WARN (THREAD_SIZE / 8)
96 * thread information flags
97 * - these are process state flags that various assembly files may need to
99 * - pending work-to-be-done flags are in LSW
100 * - other flags in MSW
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 /* also implies 16/32 fprs */
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_SYSCALL_TRACE 31 /* syscall trace active */
120 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
121 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
122 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
123 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
124 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
125 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
126 #define _TIF_USEDFPU (1<<TIF_USEDFPU)
127 #define _TIF_NOHZ (1<<TIF_NOHZ)
128 #define _TIF_FIXADE (1<<TIF_FIXADE)
129 #define _TIF_LOGADE (1<<TIF_LOGADE)
130 #define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
131 #define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
132 #define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
133 #define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
134 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
136 #define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
137 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
139 /* work to do in syscall_trace_leave() */
140 #define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
141 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
143 /* work to do on interrupt/exception return */
144 #define _TIF_WORK_MASK \
145 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
146 /* work to do on any return to u-space */
147 #define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \
148 _TIF_WORK_SYSCALL_EXIT | \
149 _TIF_SYSCALL_TRACEPOINT)
152 * We stash processor id into a COP0 register to retrieve it fast
153 * at kernel exception entry.
155 #if defined(CONFIG_MIPS_MT_SMTC)
156 #define SMP_CPUID_REG 2, 2 /* TCBIND */
157 #define ASM_SMP_CPUID_REG $2, 2
158 #define SMP_CPUID_PTRSHIFT 19
159 #elif 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
164 #define SMP_CPUID_REG 4, 0 /* CONTEXT */
165 #define ASM_SMP_CPUID_REG $4
166 #define SMP_CPUID_PTRSHIFT 23
170 #define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3)
172 #define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2)
175 #ifdef CONFIG_MIPS_MT_SMTC
176 #define ASM_CPUID_MFC0 mfc0
177 #define UASM_i_CPUID_MFC0 uasm_i_mfc0
179 #define ASM_CPUID_MFC0 MFC0
180 #define UASM_i_CPUID_MFC0 UASM_i_MFC0
183 #endif /* __KERNEL__ */
184 #endif /* _ASM_THREAD_INFO_H */