1 #ifndef _ALPHA_THREAD_INFO_H 2 #define _ALPHA_THREAD_INFO_H 3 4 #ifdef __KERNEL__ 5 6 #ifndef __ASSEMBLY__ 7 #include <asm/processor.h> 8 #include <asm/types.h> 9 #include <asm/hwrpb.h> 10 #endif 11 12 #ifndef __ASSEMBLY__ 13 struct thread_info { 14 struct pcb_struct pcb; /* palcode state */ 15 16 struct task_struct *task; /* main task structure */ 17 unsigned int flags; /* low level flags */ 18 unsigned int ieee_state; /* see fpu.h */ 19 20 struct exec_domain *exec_domain; /* execution domain */ 21 mm_segment_t addr_limit; /* thread address space */ 22 unsigned cpu; /* current CPU */ 23 int preempt_count; /* 0 => preemptable, <0 => BUG */ 24 25 int bpt_nsaved; 26 unsigned long bpt_addr[2]; /* breakpoint handling */ 27 unsigned int bpt_insn[2]; 28 29 struct restart_block restart_block; 30 }; 31 32 /* 33 * Macros/functions for gaining access to the thread information structure. 34 */ 35 #define INIT_THREAD_INFO(tsk) \ 36 { \ 37 .task = &tsk, \ 38 .exec_domain = &default_exec_domain, \ 39 .addr_limit = KERNEL_DS, \ 40 .preempt_count = INIT_PREEMPT_COUNT, \ 41 .restart_block = { \ 42 .fn = do_no_restart_syscall, \ 43 }, \ 44 } 45 46 #define init_thread_info (init_thread_union.thread_info) 47 #define init_stack (init_thread_union.stack) 48 49 /* How to get the thread information struct from C. */ 50 register struct thread_info *__current_thread_info __asm__("$8"); 51 #define current_thread_info() __current_thread_info 52 53 #endif /* __ASSEMBLY__ */ 54 55 /* Thread information allocation. */ 56 #define THREAD_SIZE_ORDER 1 57 #define THREAD_SIZE (2*PAGE_SIZE) 58 59 #define PREEMPT_ACTIVE 0x40000000 60 61 /* 62 * Thread information flags: 63 * - these are process state flags and used from assembly 64 * - pending work-to-be-done flags come first and must be assigned to be 65 * within bits 0 to 7 to fit in and immediate operand. 66 * - ALPHA_UAC_SHIFT below must be kept consistent with the unaligned 67 * control flags. 68 * 69 * TIF_SYSCALL_TRACE is known to be 0 via blbs. 70 */ 71 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 72 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 73 #define TIF_SIGPENDING 2 /* signal pending */ 74 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 75 #define TIF_POLLING_NRFLAG 8 /* poll_idle is polling NEED_RESCHED */ 76 #define TIF_DIE_IF_KERNEL 9 /* dik recursion lock */ 77 #define TIF_UAC_NOPRINT 10 /* ! Preserve sequence of following */ 78 #define TIF_UAC_NOFIX 11 /* ! flags as they match */ 79 #define TIF_UAC_SIGBUS 12 /* ! userspace part of 'osf_sysinfo' */ 80 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */ 81 #define TIF_RESTORE_SIGMASK 14 /* restore signal mask in do_signal */ 82 83 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 84 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 85 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 86 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 87 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 88 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 89 90 /* Work to do on interrupt/exception return. */ 91 #define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 92 _TIF_NOTIFY_RESUME) 93 94 /* Work to do on any return to userspace. */ 95 #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \ 96 | _TIF_SYSCALL_TRACE) 97 98 #define ALPHA_UAC_SHIFT TIF_UAC_NOPRINT 99 #define ALPHA_UAC_MASK (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \ 100 1 << TIF_UAC_SIGBUS) 101 102 #define SET_UNALIGN_CTL(task,value) ({ \ 103 task_thread_info(task)->flags = ((task_thread_info(task)->flags & \ 104 ~ALPHA_UAC_MASK) \ 105 | (((value) << ALPHA_UAC_SHIFT) & (1<<TIF_UAC_NOPRINT))\ 106 | (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \ 107 | (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\ 108 0; }) 109 110 #define GET_UNALIGN_CTL(task,value) ({ \ 111 put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\ 112 >> ALPHA_UAC_SHIFT \ 113 | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\ 114 >> (ALPHA_UAC_SHIFT + 1) \ 115 | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\ 116 >> (ALPHA_UAC_SHIFT - 1), \ 117 (int __user *)(value)); \ 118 }) 119 120 #endif /* __KERNEL__ */ 121 #endif /* _ALPHA_THREAD_INFO_H */ 122