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 30struct thread_info { 31 struct task_struct *task; /* main task structure */ 32 struct exec_domain *exec_domain; /* execution domain */ 33 unsigned long flags; /* low level flags */ 34 unsigned long status; /* thread-synchronous flags */ 35 __u32 cpu; /* current CPU */ 36 __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/ 37 38 mm_segment_t addr_limit; /* thread address space */ 39 struct restart_block restart_block; 40 41 42}; 43 44#else /* !__ASSEMBLY__ */ 45 46/* offsets into the thread_info struct for assembly code access */ 47#define TI_TASK 0x00000000 48#define TI_EXEC_DOMAIN 0x00000004 49#define TI_FLAGS 0x00000008 50#define TI_STATUS 0x0000000C 51#define TI_CPU 0x00000010 52#define TI_PRE_COUNT 0x00000014 53#define TI_ADDR_LIMIT 0x00000018 54#define TI_RESTART_BLOCK 0x000001C 55 56#endif 57 58#define PREEMPT_ACTIVE 0x10000000 59 60/* 61 * macros/functions for gaining access to the thread information structure 62 * 63 * preempt_count needs to be 1 initially, until the scheduler is functional. 64 */ 65 66#ifndef __ASSEMBLY__ 67 68#define INIT_THREAD_INFO(tsk) \ 69{ \ 70 .task = &tsk, \ 71 .exec_domain = &default_exec_domain, \ 72 .flags = 0, \ 73 .cpu = 0, \ 74 .preempt_count = 1, \ 75 .addr_limit = KERNEL_DS, \ 76 .restart_block = { \ 77 .fn = do_no_restart_syscall, \ 78 }, \ 79} 80 81#define init_thread_info (init_thread_union.thread_info) 82#define init_stack (init_thread_union.stack) 83 84/* how to get the thread information struct from C */ 85static inline struct thread_info *current_thread_info(void) 86{ 87 struct thread_info *ti; 88 __asm__("extui %0,a1,0,13\n\t" 89 "xor %0, a1, %0" : "=&r" (ti) : ); 90 return ti; 91} 92 93/* thread information allocation */ 94#define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1)) 95#define free_thread_info(ti) free_pages((unsigned long) (ti), 1) 96 97#else /* !__ASSEMBLY__ */ 98 99/* how to get the thread information struct from ASM */ 100#define GET_THREAD_INFO(reg,sp) \ 101 extui reg, sp, 0, 13; \ 102 xor reg, sp, reg 103#endif 104 105 106/* 107 * thread information flags 108 * - these are process state flags that various assembly files may need to access 109 * - pending work-to-be-done flags are in LSW 110 * - other flags in MSW 111 */ 112#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 113#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 114#define TIF_SIGPENDING 2 /* signal pending */ 115#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 116#define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */ 117#define TIF_IRET 5 /* return with iret */ 118#define TIF_MEMDIE 6 119#define TIF_RESTORE_SIGMASK 7 /* restore signal mask in do_signal() */ 120#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 121 122#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 123#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 124#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 125#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 126#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 127#define _TIF_IRET (1<<TIF_IRET) 128#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 129#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 130 131#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ 132#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */ 133 134/* 135 * Thread-synchronous status. 136 * 137 * This is different from the flags in that nobody else 138 * ever touches our thread-synchronous status, so we don't 139 * have to worry about atomic accesses. 140 */ 141#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */ 142 143#define THREAD_SIZE 8192 //(2*PAGE_SIZE) 144 145#endif /* __KERNEL__ */ 146#endif /* _XTENSA_THREAD_INFO */ 147