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__ 13struct 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. */ 49register 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 (2*PAGE_SIZE) 54#define alloc_thread_info(tsk) \ 55 ((struct thread_info *) __get_free_pages(GFP_KERNEL,1)) 56#define free_thread_info(ti) free_pages((unsigned long) (ti), 1) 57 58#endif /* __ASSEMBLY__ */ 59 60#define PREEMPT_ACTIVE 0x40000000 61 62/* 63 * Thread information flags: 64 * - these are process state flags and used from assembly 65 * - pending work-to-be-done flags come first to fit in and immediate operand. 66 * 67 * TIF_SYSCALL_TRACE is known to be 0 via blbs. 68 */ 69#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 70#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 71#define TIF_SIGPENDING 2 /* signal pending */ 72#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 73#define TIF_POLLING_NRFLAG 4 /* poll_idle is polling NEED_RESCHED */ 74#define TIF_DIE_IF_KERNEL 5 /* dik recursion lock */ 75#define TIF_UAC_NOPRINT 6 /* see sysinfo.h */ 76#define TIF_UAC_NOFIX 7 77#define TIF_UAC_SIGBUS 8 78#define TIF_MEMDIE 9 79#define TIF_RESTORE_SIGMASK 10 /* restore signal mask in do_signal */ 80 81#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 82#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 83#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 84#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 85#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 86#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 87 88/* Work to do on interrupt/exception return. */ 89#define _TIF_WORK_MASK (_TIF_NOTIFY_RESUME \ 90 | _TIF_SIGPENDING \ 91 | _TIF_NEED_RESCHED) 92 93/* Work to do on any return to userspace. */ 94#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \ 95 | _TIF_SYSCALL_TRACE) 96 97#define ALPHA_UAC_SHIFT 6 98#define ALPHA_UAC_MASK (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \ 99 1 << TIF_UAC_SIGBUS) 100 101#define SET_UNALIGN_CTL(task,value) ({ \ 102 task_thread_info(task)->flags = ((task_thread_info(task)->flags & \ 103 ~ALPHA_UAC_MASK) \ 104 | (((value) << ALPHA_UAC_SHIFT) & (1<<TIF_UAC_NOPRINT))\ 105 | (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \ 106 | (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\ 107 0; }) 108 109#define GET_UNALIGN_CTL(task,value) ({ \ 110 put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\ 111 >> ALPHA_UAC_SHIFT \ 112 | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\ 113 >> (ALPHA_UAC_SHIFT + 1) \ 114 | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\ 115 >> (ALPHA_UAC_SHIFT - 1), \ 116 (int __user *)(value)); \ 117 }) 118 119#endif /* __KERNEL__ */ 120#endif /* _ALPHA_THREAD_INFO_H */ 121