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 #ifdef __KERNEL__ 15 16 #ifndef __ASSEMBLY__ 17 # include <asm/processor.h> 18 #endif 19 20 /* 21 * low level task data that entry.S needs immediate access to 22 * - this struct should fit entirely inside of one cache line 23 * - this struct shares the supervisor stack pages 24 * - if the contents of this structure are changed, the assembly constants 25 * must also be changed 26 */ 27 28 #ifndef __ASSEMBLY__ 29 30 #if XTENSA_HAVE_COPROCESSORS 31 32 typedef struct xtregs_coprocessor { 33 xtregs_cp0_t cp0; 34 xtregs_cp1_t cp1; 35 xtregs_cp2_t cp2; 36 xtregs_cp3_t cp3; 37 xtregs_cp4_t cp4; 38 xtregs_cp5_t cp5; 39 xtregs_cp6_t cp6; 40 xtregs_cp7_t cp7; 41 } xtregs_coprocessor_t; 42 43 #endif 44 45 struct thread_info { 46 struct task_struct *task; /* main task structure */ 47 struct exec_domain *exec_domain; /* execution domain */ 48 unsigned long flags; /* low level flags */ 49 unsigned long status; /* thread-synchronous flags */ 50 __u32 cpu; /* current CPU */ 51 __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/ 52 53 mm_segment_t addr_limit; /* thread address space */ 54 struct restart_block restart_block; 55 56 unsigned long cpenable; 57 58 /* Allocate storage for extra user states and coprocessor states. */ 59 #if XTENSA_HAVE_COPROCESSORS 60 xtregs_coprocessor_t xtregs_cp; 61 #endif 62 xtregs_user_t xtregs_user; 63 }; 64 65 #else /* !__ASSEMBLY__ */ 66 67 /* offsets into the thread_info struct for assembly code access */ 68 #define TI_TASK 0x00000000 69 #define TI_EXEC_DOMAIN 0x00000004 70 #define TI_FLAGS 0x00000008 71 #define TI_STATUS 0x0000000C 72 #define TI_CPU 0x00000010 73 #define TI_PRE_COUNT 0x00000014 74 #define TI_ADDR_LIMIT 0x00000018 75 #define TI_RESTART_BLOCK 0x000001C 76 77 #endif 78 79 #define PREEMPT_ACTIVE 0x10000000 80 81 /* 82 * macros/functions for gaining access to the thread information structure 83 */ 84 85 #ifndef __ASSEMBLY__ 86 87 #define INIT_THREAD_INFO(tsk) \ 88 { \ 89 .task = &tsk, \ 90 .exec_domain = &default_exec_domain, \ 91 .flags = 0, \ 92 .cpu = 0, \ 93 .preempt_count = INIT_PREEMPT_COUNT, \ 94 .addr_limit = KERNEL_DS, \ 95 .restart_block = { \ 96 .fn = do_no_restart_syscall, \ 97 }, \ 98 } 99 100 #define init_thread_info (init_thread_union.thread_info) 101 #define init_stack (init_thread_union.stack) 102 103 /* how to get the thread information struct from C */ 104 static inline struct thread_info *current_thread_info(void) 105 { 106 struct thread_info *ti; 107 __asm__("extui %0,a1,0,13\n\t" 108 "xor %0, a1, %0" : "=&r" (ti) : ); 109 return ti; 110 } 111 112 #else /* !__ASSEMBLY__ */ 113 114 /* how to get the thread information struct from ASM */ 115 #define GET_THREAD_INFO(reg,sp) \ 116 extui reg, sp, 0, 13; \ 117 xor reg, sp, reg 118 #endif 119 120 121 /* 122 * thread information flags 123 * - these are process state flags that various assembly files may need to access 124 * - pending work-to-be-done flags are in LSW 125 * - other flags in MSW 126 */ 127 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 128 #define TIF_SIGPENDING 1 /* signal pending */ 129 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 130 #define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */ 131 #define TIF_IRET 4 /* return with iret */ 132 #define TIF_MEMDIE 5 133 #define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */ 134 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 135 #define TIF_FREEZE 17 /* is freezing for suspend */ 136 137 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 138 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 139 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 140 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 141 #define _TIF_IRET (1<<TIF_IRET) 142 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 143 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 144 #define _TIF_FREEZE (1<<TIF_FREEZE) 145 146 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ 147 #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */ 148 149 /* 150 * Thread-synchronous status. 151 * 152 * This is different from the flags in that nobody else 153 * ever touches our thread-synchronous status, so we don't 154 * have to worry about atomic accesses. 155 */ 156 #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */ 157 158 #define THREAD_SIZE 8192 //(2*PAGE_SIZE) 159 #define THREAD_SIZE_ORDER 1 160 161 #endif /* __KERNEL__ */ 162 #endif /* _XTENSA_THREAD_INFO */ 163