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136 lines
3.8 KiB
136 lines
3.8 KiB
/* |
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* include/asm-xtensa/thread_info.h |
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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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* Copyright (C) 2001 - 2005 Tensilica Inc. |
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*/ |
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#ifndef _XTENSA_THREAD_INFO_H |
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#define _XTENSA_THREAD_INFO_H |
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#include <linux/stringify.h> |
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#include <asm/kmem_layout.h> |
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#define CURRENT_SHIFT KERNEL_STACK_SHIFT |
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#ifndef __ASSEMBLY__ |
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# include <asm/processor.h> |
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#endif |
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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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#ifndef __ASSEMBLY__ |
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#if XTENSA_HAVE_COPROCESSORS |
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typedef struct xtregs_coprocessor { |
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xtregs_cp0_t cp0; |
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xtregs_cp1_t cp1; |
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xtregs_cp2_t cp2; |
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xtregs_cp3_t cp3; |
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xtregs_cp4_t cp4; |
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xtregs_cp5_t cp5; |
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xtregs_cp6_t cp6; |
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xtregs_cp7_t cp7; |
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} xtregs_coprocessor_t; |
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#endif |
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struct thread_info { |
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struct task_struct *task; /* main task structure */ |
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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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unsigned long cpenable; |
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#if XCHAL_HAVE_EXCLUSIVE |
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/* result of the most recent exclusive store */ |
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unsigned long atomctl8; |
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#endif |
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/* Allocate storage for extra user states and coprocessor states. */ |
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#if XTENSA_HAVE_COPROCESSORS |
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xtregs_coprocessor_t xtregs_cp; |
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#endif |
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xtregs_user_t xtregs_user; |
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}; |
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#endif |
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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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#ifndef __ASSEMBLY__ |
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#define INIT_THREAD_INFO(tsk) \ |
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{ \ |
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.task = &tsk, \ |
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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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} |
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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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struct thread_info *ti; |
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__asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t" |
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"xor %0, a1, %0" : "=&r" (ti) : ); |
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return ti; |
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} |
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#else /* !__ASSEMBLY__ */ |
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/* how to get the thread information struct from ASM */ |
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#define GET_THREAD_INFO(reg,sp) \ |
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extui reg, sp, 0, CURRENT_SHIFT; \ |
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xor reg, sp, reg |
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#endif |
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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 need to access |
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*/ |
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ |
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#define TIF_SIGPENDING 1 /* signal pending */ |
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#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ |
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#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */ |
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#define TIF_SYSCALL_TRACEPOINT 4 /* syscall tracepoint instrumentation */ |
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#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ |
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#define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */ |
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#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ |
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#define TIF_DB_DISABLED 8 /* debug trap disabled for syscall */ |
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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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#define TIF_MEMDIE 11 /* is terminating due to OOM killer */ |
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) |
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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_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) |
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#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) |
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
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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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#define _TIF_WORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ |
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_TIF_SYSCALL_TRACEPOINT | \ |
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_TIF_SYSCALL_AUDIT | _TIF_SECCOMP) |
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#define THREAD_SIZE KERNEL_STACK_SIZE |
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#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT) |
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#endif /* _XTENSA_THREAD_INFO */
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