/* * Copyright (C) 2006 Atmark Techno, Inc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #ifndef _ASM_MICROBLAZE_THREAD_INFO_H #define _ASM_MICROBLAZE_THREAD_INFO_H #ifdef __KERNEL__ /* we have 8k stack */ #define THREAD_SHIFT 13 #define THREAD_SIZE (1 << THREAD_SHIFT) #define THREAD_SIZE_ORDER 1 #ifndef __ASSEMBLY__ # include <linux/types.h> # include <asm/processor.h> /* * low level task data that entry.S needs immediate access to * - this struct should fit entirely inside of one cache line * - this struct shares the supervisor stack pages * - if the contents of this structure are changed, the assembly constants * must also be changed */ struct cpu_context { __u32 r1; /* stack pointer */ __u32 r2; /* dedicated registers */ __u32 r13; __u32 r14; __u32 r15; __u32 r16; __u32 r17; __u32 r18; /* non-volatile registers */ __u32 r19; __u32 r20; __u32 r21; __u32 r22; __u32 r23; __u32 r24; __u32 r25; __u32 r26; __u32 r27; __u32 r28; __u32 r29; __u32 r30; /* r31 is used as current task pointer */ /* special purpose registers */ __u32 msr; __u32 ear; __u32 esr; __u32 fsr; }; typedef struct { unsigned long seg; } mm_segment_t; struct thread_info { struct task_struct *task; /* main task structure */ struct exec_domain *exec_domain; /* execution domain */ unsigned long flags; /* low level flags */ unsigned long status; /* thread-synchronous flags */ __u32 cpu; /* current CPU */ __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/ mm_segment_t addr_limit; /* thread address space */ struct restart_block restart_block; struct cpu_context cpu_context; }; /* * macros/functions for gaining access to the thread information structure */ #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .exec_domain = &default_exec_domain, \ .flags = 0, \ .cpu = 0, \ .preempt_count = INIT_PREEMPT_COUNT, \ .addr_limit = KERNEL_DS, \ .restart_block = { \ .fn = do_no_restart_syscall, \ }, \ } #define init_thread_info (init_thread_union.thread_info) #define init_stack (init_thread_union.stack) /* how to get the thread information struct from C */ static inline struct thread_info *current_thread_info(void) { register unsigned long sp asm("r1"); return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); } /* thread information allocation */ #endif /* __ASSEMBLY__ */ /* * thread information flags * - these are process state flags that various assembly files may * need to access * - pending work-to-be-done flags are in LSW * - other flags in MSW */ #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ #define TIF_SIGPENDING 2 /* signal pending */ #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ /* restore singlestep on return to user mode */ #define TIF_SINGLESTEP 4 #define TIF_MEMDIE 6 /* is terminating due to OOM killer */ #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ #define TIF_SECCOMP 10 /* secure computing */ /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_POLLING_NRFLAG 16 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) #define _TIF_SECCOMP (1 << TIF_SECCOMP) /* work to do in syscall trace */ #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) /* work to do on interrupt/exception return */ #define _TIF_WORK_MASK 0x0000FFFE /* work to do on any return to u-space */ #define _TIF_ALLWORK_MASK 0x0000FFFF /* * Thread-synchronous status. * * This is different from the flags in that nobody else * ever touches our thread-synchronous status, so we don't * have to worry about atomic accesses. */ /* FPU was used by this task this quantum (SMP) */ #define TS_USEDFPU 0x0001 #define TS_RESTORE_SIGMASK 0x0002 #ifndef __ASSEMBLY__ #define HAVE_SET_RESTORE_SIGMASK 1 static inline void set_restore_sigmask(void) { struct thread_info *ti = current_thread_info(); ti->status |= TS_RESTORE_SIGMASK; WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags)); } static inline void clear_restore_sigmask(void) { current_thread_info()->status &= ~TS_RESTORE_SIGMASK; } static inline bool test_restore_sigmask(void) { return current_thread_info()->status & TS_RESTORE_SIGMASK; } static inline bool test_and_clear_restore_sigmask(void) { struct thread_info *ti = current_thread_info(); if (!(ti->status & TS_RESTORE_SIGMASK)) return false; ti->status &= ~TS_RESTORE_SIGMASK; return true; } #endif #endif /* __KERNEL__ */ #endif /* _ASM_MICROBLAZE_THREAD_INFO_H */