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191 lines
5.0 KiB
C
191 lines
5.0 KiB
C
/*
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_THREAD_INFO_H
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#define _ASM_MICROBLAZE_THREAD_INFO_H
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#ifdef __KERNEL__
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/* we have 8k stack */
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#define THREAD_SHIFT 13
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#define THREAD_SIZE (1 << THREAD_SHIFT)
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#define THREAD_SIZE_ORDER 1
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#ifndef __ASSEMBLY__
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# include <linux/types.h>
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# include <asm/processor.h>
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/*
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* low level task data that entry.S needs immediate access to
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* - this struct should fit entirely inside of one cache line
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* - this struct shares the supervisor stack pages
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* - if the contents of this structure are changed, the assembly constants
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* must also be changed
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*/
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struct cpu_context {
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__u32 r1; /* stack pointer */
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__u32 r2;
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/* dedicated registers */
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__u32 r13;
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__u32 r14;
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__u32 r15;
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__u32 r16;
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__u32 r17;
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__u32 r18;
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/* non-volatile registers */
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__u32 r19;
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__u32 r20;
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__u32 r21;
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__u32 r22;
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__u32 r23;
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__u32 r24;
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__u32 r25;
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__u32 r26;
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__u32 r27;
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__u32 r28;
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__u32 r29;
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__u32 r30;
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/* r31 is used as current task pointer */
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/* special purpose registers */
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__u32 msr;
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__u32 ear;
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__u32 esr;
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__u32 fsr;
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};
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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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struct thread_info {
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struct task_struct *task; /* main task structure */
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struct exec_domain *exec_domain; /* execution domain */
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unsigned long flags; /* low level flags */
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unsigned long status; /* thread-synchronous flags */
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__u32 cpu; /* current CPU */
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__s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
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mm_segment_t addr_limit; /* thread address space */
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struct restart_block restart_block;
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struct cpu_context cpu_context;
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};
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/*
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* macros/functions for gaining access to the thread information structure
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*/
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.exec_domain = &default_exec_domain, \
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.flags = 0, \
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.cpu = 0, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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.addr_limit = KERNEL_DS, \
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.restart_block = { \
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.fn = do_no_restart_syscall, \
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}, \
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}
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#define init_thread_info (init_thread_union.thread_info)
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#define init_stack (init_thread_union.stack)
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/* how to get the thread information struct from C */
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static inline struct thread_info *current_thread_info(void)
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{
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register unsigned long sp asm("r1");
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return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
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}
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/* thread information allocation */
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#endif /* __ASSEMBLY__ */
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#define PREEMPT_ACTIVE 0x10000000
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/*
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* thread information flags
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* - these are process state flags that various assembly files may
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* need to access
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* - pending work-to-be-done flags are in LSW
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* - other flags in MSW
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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/* restore singlestep on return to user mode */
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#define TIF_SINGLESTEP 4
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#define TIF_IRET 5 /* return with iret */
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#define TIF_MEMDIE 6 /* is terminating due to OOM killer */
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#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
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#define TIF_SECCOMP 10 /* secure computing */
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/* true if poll_idle() is polling TIF_NEED_RESCHED */
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#define TIF_POLLING_NRFLAG 16
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#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
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#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
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#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
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#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
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#define _TIF_IRET (1 << TIF_IRET)
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#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
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#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
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#define _TIF_SECCOMP (1 << TIF_SECCOMP)
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/* work to do in syscall trace */
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#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
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_TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
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/* work to do on interrupt/exception return */
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#define _TIF_WORK_MASK 0x0000FFFE
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/* work to do on any return to u-space */
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#define _TIF_ALLWORK_MASK 0x0000FFFF
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/*
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* Thread-synchronous status.
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*
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* This is different from the flags in that nobody else
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* ever touches our thread-synchronous status, so we don't
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* have to worry about atomic accesses.
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*/
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/* FPU was used by this task this quantum (SMP) */
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#define TS_USEDFPU 0x0001
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#define TS_RESTORE_SIGMASK 0x0002
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#ifndef __ASSEMBLY__
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#define HAVE_SET_RESTORE_SIGMASK 1
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static inline void set_restore_sigmask(void)
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{
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struct thread_info *ti = current_thread_info();
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ti->status |= TS_RESTORE_SIGMASK;
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WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
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}
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static inline void clear_restore_sigmask(void)
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{
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current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
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}
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static inline bool test_restore_sigmask(void)
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{
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return current_thread_info()->status & TS_RESTORE_SIGMASK;
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}
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static inline bool test_and_clear_restore_sigmask(void)
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{
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struct thread_info *ti = current_thread_info();
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if (!(ti->status & TS_RESTORE_SIGMASK))
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return false;
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ti->status &= ~TS_RESTORE_SIGMASK;
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return true;
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}
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#endif
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#endif /* __KERNEL__ */
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#endif /* _ASM_MICROBLAZE_THREAD_INFO_H */
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