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 .restart_block = { \ 41 .fn = do_no_restart_syscall, \ 42 }, \ 43 } 44 45 #define init_thread_info (init_thread_union.thread_info) 46 #define init_stack (init_thread_union.stack) 47 48 /* How to get the thread information struct from C. */ 49 register struct thread_info *__current_thread_info __asm__("$8"); 50 #define current_thread_info() __current_thread_info 51 52 /* Thread information allocation. */ 53 #define THREAD_SIZE_ORDER 1 54 #define THREAD_SIZE (2*PAGE_SIZE) 55 56 #endif /* __ASSEMBLY__ */ 57 58 #define PREEMPT_ACTIVE 0x40000000 59 60 /* 61 * Thread information flags: 62 * - these are process state flags and used from assembly 63 * - pending work-to-be-done flags come first to fit in and immediate operand. 64 * 65 * TIF_SYSCALL_TRACE is known to be 0 via blbs. 66 */ 67 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 68 #define TIF_SIGPENDING 1 /* signal pending */ 69 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 70 #define TIF_POLLING_NRFLAG 3 /* poll_idle is polling NEED_RESCHED */ 71 #define TIF_DIE_IF_KERNEL 4 /* dik recursion lock */ 72 #define TIF_UAC_NOPRINT 5 /* see sysinfo.h */ 73 #define TIF_UAC_NOFIX 6 74 #define TIF_UAC_SIGBUS 7 75 #define TIF_MEMDIE 8 76 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */ 77 #define TIF_FREEZE 16 /* is freezing for suspend */ 78 79 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 80 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 81 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 82 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 83 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 84 #define _TIF_FREEZE (1<<TIF_FREEZE) 85 86 /* Work to do on interrupt/exception return. */ 87 #define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED) 88 89 /* Work to do on any return to userspace. */ 90 #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \ 91 | _TIF_SYSCALL_TRACE) 92 93 #define ALPHA_UAC_SHIFT 6 94 #define ALPHA_UAC_MASK (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \ 95 1 << TIF_UAC_SIGBUS) 96 97 #define SET_UNALIGN_CTL(task,value) ({ \ 98 task_thread_info(task)->flags = ((task_thread_info(task)->flags & \ 99 ~ALPHA_UAC_MASK) \ 100 | (((value) << ALPHA_UAC_SHIFT) & (1<<TIF_UAC_NOPRINT))\ 101 | (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \ 102 | (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\ 103 0; }) 104 105 #define GET_UNALIGN_CTL(task,value) ({ \ 106 put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\ 107 >> ALPHA_UAC_SHIFT \ 108 | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\ 109 >> (ALPHA_UAC_SHIFT + 1) \ 110 | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\ 111 >> (ALPHA_UAC_SHIFT - 1), \ 112 (int __user *)(value)); \ 113 }) 114 115 #endif /* __KERNEL__ */ 116 #endif /* _ALPHA_THREAD_INFO_H */ 117