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 unsigned long flags; /* low level flags */ 27 unsigned long tp_value; /* thread pointer */ 28 __u32 cpu; /* current CPU */ 29 int preempt_count; /* 0 => preemptable, <0 => BUG */ 30 mm_segment_t addr_limit; /* 31 * thread address space limit: 32 * 0x7fffffff for user-thead 33 * 0xffffffff for kernel-thread 34 */ 35 struct pt_regs *regs; 36 long syscall; /* syscall number */ 37 }; 38 39 /* 40 * macros/functions for gaining access to the thread information structure 41 */ 42 #define INIT_THREAD_INFO(tsk) \ 43 { \ 44 .task = &tsk, \ 45 .flags = _TIF_FIXADE, \ 46 .cpu = 0, \ 47 .preempt_count = INIT_PREEMPT_COUNT, \ 48 .addr_limit = KERNEL_DS, \ 49 } 50 51 #define init_thread_info (init_thread_union.thread_info) 52 #define init_stack (init_thread_union.stack) 53 54 /* How to get the thread information struct from C. */ 55 register struct thread_info *__current_thread_info __asm__("$28"); 56 57 static inline struct thread_info *current_thread_info(void) 58 { 59 return __current_thread_info; 60 } 61 62 #endif /* !__ASSEMBLY__ */ 63 64 /* thread information allocation */ 65 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) 66 #define THREAD_SIZE_ORDER (1) 67 #endif 68 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) 69 #define THREAD_SIZE_ORDER (2) 70 #endif 71 #ifdef CONFIG_PAGE_SIZE_8KB 72 #define THREAD_SIZE_ORDER (1) 73 #endif 74 #ifdef CONFIG_PAGE_SIZE_16KB 75 #define THREAD_SIZE_ORDER (0) 76 #endif 77 #ifdef CONFIG_PAGE_SIZE_32KB 78 #define THREAD_SIZE_ORDER (0) 79 #endif 80 #ifdef CONFIG_PAGE_SIZE_64KB 81 #define THREAD_SIZE_ORDER (0) 82 #endif 83 84 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 85 #define THREAD_MASK (THREAD_SIZE - 1UL) 86 87 #define STACK_WARN (THREAD_SIZE / 8) 88 89 /* 90 * thread information flags 91 * - these are process state flags that various assembly files may need to 92 * access 93 * - pending work-to-be-done flags are in LSW 94 * - other flags in MSW 95 */ 96 #define TIF_SIGPENDING 1 /* signal pending */ 97 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 98 #define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */ 99 #define TIF_SECCOMP 4 /* secure computing */ 100 #define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ 101 #define TIF_UPROBE 6 /* breakpointed or singlestepping */ 102 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 103 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 104 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 105 #define TIF_NOHZ 19 /* in adaptive nohz mode */ 106 #define TIF_FIXADE 20 /* Fix address errors in software */ 107 #define TIF_LOGADE 21 /* Log address errors to syslog */ 108 #define TIF_32BIT_REGS 22 /* 32-bit general purpose registers */ 109 #define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */ 110 #define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */ 111 #define TIF_LOAD_WATCH 25 /* If set, load watch registers */ 112 #define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */ 113 #define TIF_32BIT_FPREGS 27 /* 32-bit floating point registers */ 114 #define TIF_HYBRID_FPREGS 28 /* 64b FP registers, odd singles in bits 63:32 of even doubles */ 115 #define TIF_USEDMSA 29 /* MSA has been used this quantum */ 116 #define TIF_MSA_CTX_LIVE 30 /* MSA context must be preserved */ 117 #define TIF_SYSCALL_TRACE 31 /* syscall trace active */ 118 119 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 120 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 121 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 122 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 123 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 124 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 125 #define _TIF_UPROBE (1<<TIF_UPROBE) 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_32BIT_FPREGS (1<<TIF_32BIT_FPREGS) 135 #define _TIF_HYBRID_FPREGS (1<<TIF_HYBRID_FPREGS) 136 #define _TIF_USEDMSA (1<<TIF_USEDMSA) 137 #define _TIF_MSA_CTX_LIVE (1<<TIF_MSA_CTX_LIVE) 138 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 139 140 #define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ 141 _TIF_SYSCALL_AUDIT | \ 142 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) 143 144 /* work to do in syscall_trace_leave() */ 145 #define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ 146 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT) 147 148 /* work to do on interrupt/exception return */ 149 #define _TIF_WORK_MASK \ 150 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME | \ 151 _TIF_UPROBE) 152 /* work to do on any return to u-space */ 153 #define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \ 154 _TIF_WORK_SYSCALL_EXIT | \ 155 _TIF_SYSCALL_TRACEPOINT) 156 157 /* 158 * We stash processor id into a COP0 register to retrieve it fast 159 * at kernel exception entry. 160 */ 161 #if defined(CONFIG_MIPS_PGD_C0_CONTEXT) 162 #define SMP_CPUID_REG 20, 0 /* XCONTEXT */ 163 #define ASM_SMP_CPUID_REG $20 164 #define SMP_CPUID_PTRSHIFT 48 165 #else 166 #define SMP_CPUID_REG 4, 0 /* CONTEXT */ 167 #define ASM_SMP_CPUID_REG $4 168 #define SMP_CPUID_PTRSHIFT 23 169 #endif 170 171 #ifdef CONFIG_64BIT 172 #define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3) 173 #else 174 #define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2) 175 #endif 176 177 #define ASM_CPUID_MFC0 MFC0 178 #define UASM_i_CPUID_MFC0 UASM_i_MFC0 179 180 #endif /* __KERNEL__ */ 181 #endif /* _ASM_THREAD_INFO_H */ 182