1 /* 2 * include/asm-xtensa/thread_info.h 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 2001 - 2005 Tensilica Inc. 9 */ 10 11 #ifndef _XTENSA_THREAD_INFO_H 12 #define _XTENSA_THREAD_INFO_H 13 14 #include <linux/stringify.h> 15 #include <asm/kmem_layout.h> 16 17 #define CURRENT_SHIFT KERNEL_STACK_SHIFT 18 19 #ifndef __ASSEMBLY__ 20 # include <asm/processor.h> 21 #endif 22 23 /* 24 * low level task data that entry.S needs immediate access to 25 * - this struct should fit entirely inside of one cache line 26 * - this struct shares the supervisor stack pages 27 * - if the contents of this structure are changed, the assembly constants 28 * must also be changed 29 */ 30 31 #ifndef __ASSEMBLY__ 32 33 #if XTENSA_HAVE_COPROCESSORS 34 35 typedef struct xtregs_coprocessor { 36 xtregs_cp0_t cp0; 37 xtregs_cp1_t cp1; 38 xtregs_cp2_t cp2; 39 xtregs_cp3_t cp3; 40 xtregs_cp4_t cp4; 41 xtregs_cp5_t cp5; 42 xtregs_cp6_t cp6; 43 xtregs_cp7_t cp7; 44 } xtregs_coprocessor_t; 45 46 #endif 47 48 struct thread_info { 49 struct task_struct *task; /* main task structure */ 50 unsigned long flags; /* low level flags */ 51 unsigned long status; /* thread-synchronous flags */ 52 __u32 cpu; /* current CPU */ 53 __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/ 54 55 unsigned long cpenable; 56 #if XCHAL_HAVE_EXCLUSIVE 57 /* result of the most recent exclusive store */ 58 unsigned long atomctl8; 59 #endif 60 61 /* Allocate storage for extra user states and coprocessor states. */ 62 #if XTENSA_HAVE_COPROCESSORS 63 xtregs_coprocessor_t xtregs_cp; 64 #endif 65 xtregs_user_t xtregs_user; 66 }; 67 68 #endif 69 70 /* 71 * macros/functions for gaining access to the thread information structure 72 */ 73 74 #ifndef __ASSEMBLY__ 75 76 #define INIT_THREAD_INFO(tsk) \ 77 { \ 78 .task = &tsk, \ 79 .flags = 0, \ 80 .cpu = 0, \ 81 .preempt_count = INIT_PREEMPT_COUNT, \ 82 } 83 84 /* how to get the thread information struct from C */ 85 static inline struct thread_info *current_thread_info(void) 86 { 87 struct thread_info *ti; 88 __asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t" 89 "xor %0, a1, %0" : "=&r" (ti) : ); 90 return ti; 91 } 92 93 #else /* !__ASSEMBLY__ */ 94 95 /* how to get the thread information struct from ASM */ 96 #define GET_THREAD_INFO(reg,sp) \ 97 extui reg, sp, 0, CURRENT_SHIFT; \ 98 xor reg, sp, reg 99 #endif 100 101 102 /* 103 * thread information flags 104 * - these are process state flags that various assembly files may need to access 105 */ 106 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 107 #define TIF_SIGPENDING 1 /* signal pending */ 108 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 109 #define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */ 110 #define TIF_SYSCALL_TRACEPOINT 4 /* syscall tracepoint instrumentation */ 111 #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ 112 #define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */ 113 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ 114 #define TIF_DB_DISABLED 8 /* debug trap disabled for syscall */ 115 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 116 #define TIF_SECCOMP 10 /* secure computing */ 117 #define TIF_MEMDIE 11 /* is terminating due to OOM killer */ 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_SINGLESTEP (1<<TIF_SINGLESTEP) 123 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 124 #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) 125 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 126 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 127 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 128 129 #define _TIF_WORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 130 _TIF_SYSCALL_TRACEPOINT | \ 131 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) 132 133 #define THREAD_SIZE KERNEL_STACK_SIZE 134 #define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT) 135 136 #endif /* _XTENSA_THREAD_INFO */ 137