1/* 2 * Copyright (C) 2006 Atmark Techno, Inc. 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 9#ifndef _ASM_MICROBLAZE_THREAD_INFO_H 10#define _ASM_MICROBLAZE_THREAD_INFO_H 11 12#ifdef __KERNEL__ 13 14/* we have 8k stack */ 15#define THREAD_SHIFT 13 16#define THREAD_SIZE (1 << THREAD_SHIFT) 17#define THREAD_SIZE_ORDER 1 18 19#ifndef __ASSEMBLY__ 20# include <linux/types.h> 21# include <asm/processor.h> 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 31struct cpu_context { 32 __u32 r1; /* stack pointer */ 33 __u32 r2; 34 /* dedicated registers */ 35 __u32 r13; 36 __u32 r14; 37 __u32 r15; 38 __u32 r16; 39 __u32 r17; 40 __u32 r18; 41 /* non-volatile registers */ 42 __u32 r19; 43 __u32 r20; 44 __u32 r21; 45 __u32 r22; 46 __u32 r23; 47 __u32 r24; 48 __u32 r25; 49 __u32 r26; 50 __u32 r27; 51 __u32 r28; 52 __u32 r29; 53 __u32 r30; 54 /* r31 is used as current task pointer */ 55 /* special purpose registers */ 56 __u32 msr; 57 __u32 ear; 58 __u32 esr; 59 __u32 fsr; 60}; 61 62typedef struct { 63 unsigned long seg; 64} mm_segment_t; 65 66struct thread_info { 67 struct task_struct *task; /* main task structure */ 68 unsigned long flags; /* low level flags */ 69 unsigned long status; /* thread-synchronous flags */ 70 __u32 cpu; /* current CPU */ 71 __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/ 72 mm_segment_t addr_limit; /* thread address space */ 73 74 struct cpu_context cpu_context; 75}; 76 77/* 78 * macros/functions for gaining access to the thread information structure 79 */ 80#define INIT_THREAD_INFO(tsk) \ 81{ \ 82 .task = &tsk, \ 83 .flags = 0, \ 84 .cpu = 0, \ 85 .preempt_count = INIT_PREEMPT_COUNT, \ 86 .addr_limit = KERNEL_DS, \ 87} 88 89#define init_thread_info (init_thread_union.thread_info) 90#define init_stack (init_thread_union.stack) 91 92/* how to get the thread information struct from C */ 93static inline struct thread_info *current_thread_info(void) 94{ 95 register unsigned long sp asm("r1"); 96 97 return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); 98} 99 100/* thread information allocation */ 101#endif /* __ASSEMBLY__ */ 102 103/* 104 * thread information flags 105 * - these are process state flags that various assembly files may 106 * need to access 107 * - pending work-to-be-done flags are in LSW 108 * - other flags in MSW 109 */ 110#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 111#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 112#define TIF_SIGPENDING 2 /* signal pending */ 113#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 114/* restore singlestep on return to user mode */ 115#define TIF_SINGLESTEP 4 116#define TIF_MEMDIE 6 /* is terminating due to OOM killer */ 117#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 118#define TIF_SECCOMP 10 /* secure computing */ 119 120/* true if poll_idle() is polling TIF_NEED_RESCHED */ 121#define TIF_POLLING_NRFLAG 16 122 123#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 124#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 125#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 126#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 127#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 128#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 129#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 130#define _TIF_SECCOMP (1 << TIF_SECCOMP) 131 132/* work to do in syscall trace */ 133#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ 134 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) 135 136/* work to do on interrupt/exception return */ 137#define _TIF_WORK_MASK 0x0000FFFE 138 139/* work to do on any return to u-space */ 140#define _TIF_ALLWORK_MASK 0x0000FFFF 141 142/* 143 * Thread-synchronous status. 144 * 145 * This is different from the flags in that nobody else 146 * ever touches our thread-synchronous status, so we don't 147 * have to worry about atomic accesses. 148 */ 149/* FPU was used by this task this quantum (SMP) */ 150#define TS_USEDFPU 0x0001 151#define TS_RESTORE_SIGMASK 0x0002 152 153#ifndef __ASSEMBLY__ 154#define HAVE_SET_RESTORE_SIGMASK 1 155static inline void set_restore_sigmask(void) 156{ 157 struct thread_info *ti = current_thread_info(); 158 ti->status |= TS_RESTORE_SIGMASK; 159 WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags)); 160} 161static inline void clear_restore_sigmask(void) 162{ 163 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 164} 165static inline bool test_restore_sigmask(void) 166{ 167 return current_thread_info()->status & TS_RESTORE_SIGMASK; 168} 169static inline bool test_and_clear_restore_sigmask(void) 170{ 171 struct thread_info *ti = current_thread_info(); 172 if (!(ti->status & TS_RESTORE_SIGMASK)) 173 return false; 174 ti->status &= ~TS_RESTORE_SIGMASK; 175 return true; 176} 177#endif 178 179#endif /* __KERNEL__ */ 180#endif /* _ASM_MICROBLAZE_THREAD_INFO_H */ 181