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