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 */ 24struct 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 int r2_emul_return; /* 1 => Returning from R2 emulator */ 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#define init_thread_info (init_thread_union.thread_info) 53#define init_stack (init_thread_union.stack) 54 55/* How to get the thread information struct from C. */ 56register struct thread_info *__current_thread_info __asm__("$28"); 57 58static inline struct thread_info *current_thread_info(void) 59{ 60 return __current_thread_info; 61} 62 63#endif /* !__ASSEMBLY__ */ 64 65/* thread information allocation */ 66#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) 67#define THREAD_SIZE_ORDER (1) 68#endif 69#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) 70#define THREAD_SIZE_ORDER (2) 71#endif 72#ifdef CONFIG_PAGE_SIZE_8KB 73#define THREAD_SIZE_ORDER (1) 74#endif 75#ifdef CONFIG_PAGE_SIZE_16KB 76#define THREAD_SIZE_ORDER (0) 77#endif 78#ifdef CONFIG_PAGE_SIZE_32KB 79#define THREAD_SIZE_ORDER (0) 80#endif 81#ifdef CONFIG_PAGE_SIZE_64KB 82#define THREAD_SIZE_ORDER (0) 83#endif 84 85#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 86#define THREAD_MASK (THREAD_SIZE - 1UL) 87 88#define STACK_WARN (THREAD_SIZE / 8) 89 90/* 91 * thread information flags 92 * - these are process state flags that various assembly files may need to 93 * access 94 * - pending work-to-be-done flags are in LSW 95 * - other flags in MSW 96 */ 97#define TIF_SIGPENDING 1 /* signal pending */ 98#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 99#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */ 100#define TIF_SECCOMP 4 /* secure computing */ 101#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ 102#define TIF_UPROBE 6 /* breakpointed or singlestepping */ 103#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 104#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 105#define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 106#define TIF_NOHZ 19 /* in adaptive nohz mode */ 107#define TIF_FIXADE 20 /* Fix address errors in software */ 108#define TIF_LOGADE 21 /* Log address errors to syslog */ 109#define TIF_32BIT_REGS 22 /* 32-bit general purpose registers */ 110#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */ 111#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */ 112#define TIF_LOAD_WATCH 25 /* If set, load watch registers */ 113#define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */ 114#define TIF_32BIT_FPREGS 27 /* 32-bit floating point registers */ 115#define TIF_HYBRID_FPREGS 28 /* 64b FP registers, odd singles in bits 63:32 of even doubles */ 116#define TIF_USEDMSA 29 /* MSA has been used this quantum */ 117#define TIF_MSA_CTX_LIVE 30 /* MSA context must be preserved */ 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_UPROBE (1<<TIF_UPROBE) 127#define _TIF_USEDFPU (1<<TIF_USEDFPU) 128#define _TIF_NOHZ (1<<TIF_NOHZ) 129#define _TIF_FIXADE (1<<TIF_FIXADE) 130#define _TIF_LOGADE (1<<TIF_LOGADE) 131#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) 132#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) 133#define _TIF_FPUBOUND (1<<TIF_FPUBOUND) 134#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) 135#define _TIF_32BIT_FPREGS (1<<TIF_32BIT_FPREGS) 136#define _TIF_HYBRID_FPREGS (1<<TIF_HYBRID_FPREGS) 137#define _TIF_USEDMSA (1<<TIF_USEDMSA) 138#define _TIF_MSA_CTX_LIVE (1<<TIF_MSA_CTX_LIVE) 139#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 140 141#define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ 142 _TIF_SYSCALL_AUDIT | \ 143 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) 144 145/* work to do in syscall_trace_leave() */ 146#define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ 147 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT) 148 149/* work to do on interrupt/exception return */ 150#define _TIF_WORK_MASK \ 151 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME | \ 152 _TIF_UPROBE) 153/* work to do on any return to u-space */ 154#define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \ 155 _TIF_WORK_SYSCALL_EXIT | \ 156 _TIF_SYSCALL_TRACEPOINT) 157 158/* 159 * We stash processor id into a COP0 register to retrieve it fast 160 * at kernel exception entry. 161 */ 162#if defined(CONFIG_MIPS_PGD_C0_CONTEXT) 163#define SMP_CPUID_REG 20, 0 /* XCONTEXT */ 164#define ASM_SMP_CPUID_REG $20 165#define SMP_CPUID_PTRSHIFT 48 166#else 167#define SMP_CPUID_REG 4, 0 /* CONTEXT */ 168#define ASM_SMP_CPUID_REG $4 169#define SMP_CPUID_PTRSHIFT 23 170#endif 171 172#ifdef CONFIG_64BIT 173#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3) 174#else 175#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2) 176#endif 177 178#define ASM_CPUID_MFC0 MFC0 179#define UASM_i_CPUID_MFC0 UASM_i_MFC0 180 181#endif /* __KERNEL__ */ 182#endif /* _ASM_THREAD_INFO_H */ 183