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 #if XCHAL_HAVE_EXCLUSIVE 56 /* result of the most recent exclusive store */ 57 unsigned long atomctl8; 58 #endif 59 #ifdef CONFIG_USER_ABI_CALL0_PROBE 60 /* Address where PS.WOE was enabled by the ABI probing code */ 61 unsigned long ps_woe_fix_addr; 62 #endif 63 64 /* 65 * If i-th bit is set then coprocessor state is loaded into the 66 * coprocessor i on CPU cp_owner_cpu. 67 */ 68 unsigned long cpenable; 69 u32 cp_owner_cpu; 70 /* Allocate storage for extra user states and coprocessor states. */ 71 #if XTENSA_HAVE_COPROCESSORS 72 xtregs_coprocessor_t xtregs_cp; 73 #endif 74 xtregs_user_t xtregs_user; 75 }; 76 77 #endif 78 79 /* 80 * macros/functions for gaining access to the thread information structure 81 */ 82 83 #ifndef __ASSEMBLY__ 84 85 #define INIT_THREAD_INFO(tsk) \ 86 { \ 87 .task = &tsk, \ 88 .flags = 0, \ 89 .cpu = 0, \ 90 .preempt_count = INIT_PREEMPT_COUNT, \ 91 } 92 93 /* how to get the thread information struct from C */ 94 static inline struct thread_info *current_thread_info(void) 95 { 96 struct thread_info *ti; 97 __asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t" 98 "xor %0, a1, %0" : "=&r" (ti) : ); 99 return ti; 100 } 101 102 #else /* !__ASSEMBLY__ */ 103 104 /* how to get the thread information struct from ASM */ 105 #define GET_THREAD_INFO(reg,sp) \ 106 extui reg, sp, 0, CURRENT_SHIFT; \ 107 xor reg, sp, reg 108 #endif 109 110 111 /* 112 * thread information flags 113 * - these are process state flags that various assembly files may need to access 114 */ 115 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 116 #define TIF_SIGPENDING 1 /* signal pending */ 117 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 118 #define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */ 119 #define TIF_SYSCALL_TRACEPOINT 4 /* syscall tracepoint instrumentation */ 120 #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ 121 #define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */ 122 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ 123 #define TIF_DB_DISABLED 8 /* debug trap disabled for syscall */ 124 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 125 #define TIF_SECCOMP 10 /* secure computing */ 126 #define TIF_MEMDIE 11 /* is terminating due to OOM killer */ 127 128 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 129 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 130 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 131 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 132 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 133 #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) 134 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 135 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 136 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 137 138 #define _TIF_WORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 139 _TIF_SYSCALL_TRACEPOINT | \ 140 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) 141 142 #define THREAD_SIZE KERNEL_STACK_SIZE 143 #define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT) 144 145 #endif /* _XTENSA_THREAD_INFO */ 146