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Linux/arch/mips/include/asm/thread_info.h

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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  */
 24 struct 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.  */
 61 static 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      /* 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 */
119 
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)
135 
136 #define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE |       \
137                                  _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
138 
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)
142 
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)
150 
151 /*
152  * We stash processor id into a COP0 register to retrieve it fast
153  * at kernel exception entry.
154  */
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
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 #ifdef CONFIG_MIPS_MT_SMTC
176 #define ASM_CPUID_MFC0          mfc0
177 #define UASM_i_CPUID_MFC0       uasm_i_mfc0
178 #else
179 #define ASM_CPUID_MFC0          MFC0
180 #define UASM_i_CPUID_MFC0       UASM_i_MFC0
181 #endif
182 
183 #endif /* __KERNEL__ */
184 #endif /* _ASM_THREAD_INFO_H */
185 

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