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 59 /* Allocate storage for extra user states and coprocessor states. */ 60 #if XTENSA_HAVE_COPROCESSORS 61 xtregs_coprocessor_t xtregs_cp; 62 #endif 63 xtregs_user_t xtregs_user; 64 }; 65 66 #endif 67 68 /* 69 * macros/functions for gaining access to the thread information structure 70 */ 71 72 #ifndef __ASSEMBLY__ 73 74 #define INIT_THREAD_INFO(tsk) \ 75 { \ 76 .task = &tsk, \ 77 .flags = 0, \ 78 .cpu = 0, \ 79 .preempt_count = INIT_PREEMPT_COUNT, \ 80 .addr_limit = KERNEL_DS, \ 81 } 82 83 /* how to get the thread information struct from C */ 84 static inline struct thread_info *current_thread_info(void) 85 { 86 struct thread_info *ti; 87 __asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t" 88 "xor %0, a1, %0" : "=&r" (ti) : ); 89 return ti; 90 } 91 92 #else /* !__ASSEMBLY__ */ 93 94 /* how to get the thread information struct from ASM */ 95 #define GET_THREAD_INFO(reg,sp) \ 96 extui reg, sp, 0, CURRENT_SHIFT; \ 97 xor reg, sp, reg 98 #endif 99 100 101 /* 102 * thread information flags 103 * - these are process state flags that various assembly files may need to access 104 */ 105 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 106 #define TIF_SIGPENDING 1 /* signal pending */ 107 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 108 #define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */ 109 #define TIF_SYSCALL_TRACEPOINT 4 /* syscall tracepoint instrumentation */ 110 #define TIF_MEMDIE 5 /* is terminating due to OOM killer */ 111 #define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */ 112 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ 113 #define TIF_DB_DISABLED 8 /* debug trap disabled for syscall */ 114 115 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 116 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 117 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 118 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 119 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 120 121 #define _TIF_WORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 122 _TIF_SYSCALL_TRACEPOINT) 123 124 #define THREAD_SIZE KERNEL_STACK_SIZE 125 #define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT) 126 127 #endif /* _XTENSA_THREAD_INFO */ 128