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 mm_segment_t addr_limit; /* thread address space */ 56 57 unsigned long cpenable; 58 #if XCHAL_HAVE_EXCLUSIVE 59 /* result of the most recent exclusive store */ 60 unsigned long atomctl8; 61 #endif 62 63 /* Allocate storage for extra user states and coprocessor states. */ 64 #if XTENSA_HAVE_COPROCESSORS 65 xtregs_coprocessor_t xtregs_cp; 66 #endif 67 xtregs_user_t xtregs_user; 68 }; 69 70 #endif 71 72 /* 73 * macros/functions for gaining access to the thread information structure 74 */ 75 76 #ifndef __ASSEMBLY__ 77 78 #define INIT_THREAD_INFO(tsk) \ 79 { \ 80 .task = &tsk, \ 81 .flags = 0, \ 82 .cpu = 0, \ 83 .preempt_count = INIT_PREEMPT_COUNT, \ 84 .addr_limit = KERNEL_DS, \ 85 } 86 87 /* how to get the thread information struct from C */ 88 static inline struct thread_info *current_thread_info(void) 89 { 90 struct thread_info *ti; 91 __asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t" 92 "xor %0, a1, %0" : "=&r" (ti) : ); 93 return ti; 94 } 95 96 #else /* !__ASSEMBLY__ */ 97 98 /* how to get the thread information struct from ASM */ 99 #define GET_THREAD_INFO(reg,sp) \ 100 extui reg, sp, 0, CURRENT_SHIFT; \ 101 xor reg, sp, reg 102 #endif 103 104 105 /* 106 * thread information flags 107 * - these are process state flags that various assembly files may need to access 108 */ 109 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 110 #define TIF_SIGPENDING 1 /* signal pending */ 111 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 112 #define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */ 113 #define TIF_SYSCALL_TRACEPOINT 4 /* syscall tracepoint instrumentation */ 114 #define TIF_MEMDIE 5 /* is terminating due to OOM killer */ 115 #define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */ 116 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ 117 #define TIF_DB_DISABLED 8 /* debug trap disabled for syscall */ 118 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 119 #define TIF_SECCOMP 10 /* secure computing */ 120 121 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 122 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 123 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 124 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 125 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 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