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/* thread_info.h: MIPS low-level thread information
*
* Copyright ( C ) 2002 David Howells ( dhowells @ redhat . com )
* - Incorporating suggestions made by Linus Torvalds and Dave Miller
*/
# ifndef _ASM_THREAD_INFO_H
# define _ASM_THREAD_INFO_H
# ifdef __KERNEL__
# ifndef __ASSEMBLY__
# 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 thread_info {
struct task_struct * task ; /* main task structure */
struct exec_domain * exec_domain ; /* execution domain */
unsigned long flags ; /* low level flags */
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unsigned long tp_value ; /* thread pointer */
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__u32 cpu ; /* current CPU */
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int preempt_count ; /* 0 => preemptable, <0 => BUG */
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mm_segment_t addr_limit ; /*
* thread address space limit :
* 0x7fffffff for user - thead
* 0xffffffff for kernel - thread
*/
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struct restart_block restart_block ;
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struct pt_regs * regs ;
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} ;
/*
* macros / functions for gaining access to the thread information structure
*/
# define INIT_THREAD_INFO(tsk) \
{ \
. task = & tsk , \
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. exec_domain = & default_exec_domain , \
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. flags = _TIF_FIXADE , \
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. cpu = 0 , \
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. preempt_count = INIT_PREEMPT_COUNT , \
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. 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. */
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static inline struct thread_info * current_thread_info ( void )
{
register struct thread_info * __current_thread_info __asm__ ( " $28 " ) ;
return __current_thread_info ;
}
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# endif /* !__ASSEMBLY__ */
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/* thread information allocation */
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# if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
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# define THREAD_SIZE_ORDER (1)
# endif
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# if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
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# define THREAD_SIZE_ORDER (2)
# endif
# ifdef CONFIG_PAGE_SIZE_8KB
# define THREAD_SIZE_ORDER (1)
# endif
# ifdef CONFIG_PAGE_SIZE_16KB
# define THREAD_SIZE_ORDER (0)
# endif
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# ifdef CONFIG_PAGE_SIZE_32KB
# define THREAD_SIZE_ORDER (0)
# endif
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# ifdef CONFIG_PAGE_SIZE_64KB
# define THREAD_SIZE_ORDER (0)
# endif
# define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
# define THREAD_MASK (THREAD_SIZE - 1UL)
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# define STACK_WARN (THREAD_SIZE / 8)
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/*
* 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
*/
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# define TIF_SIGPENDING 1 /* signal pending */
# define TIF_NEED_RESCHED 2 /* rescheduling necessary */
# define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
# define TIF_SECCOMP 4 /* secure computing */
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# define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
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# define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
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# define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
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# define TIF_MEMDIE 18 /* is terminating due to OOM killer */
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# define TIF_NOHZ 19 /* in adaptive nohz mode */
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# define TIF_FIXADE 20 /* Fix address errors in software */
# define TIF_LOGADE 21 /* Log address errors to syslog */
# define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */
# define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
# define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
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# define TIF_LOAD_WATCH 25 /* If set, load watch registers */
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# define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */
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# define TIF_SYSCALL_TRACE 31 /* syscall trace active */
# define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
# define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
# define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
# define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
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# define _TIF_SECCOMP (1<<TIF_SECCOMP)
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# define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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# define _TIF_USEDFPU (1<<TIF_USEDFPU)
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# define _TIF_NOHZ (1<<TIF_NOHZ)
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# define _TIF_FIXADE (1<<TIF_FIXADE)
# define _TIF_LOGADE (1<<TIF_LOGADE)
# define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
# define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
# define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
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# define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
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# define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
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# define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
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_TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT )
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/* work to do in syscall_trace_leave() */
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# define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
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_TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT )
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/* work to do on interrupt/exception return */
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# define _TIF_WORK_MASK \
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( _TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME )
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/* work to do on any return to u-space */
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# define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \
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_TIF_WORK_SYSCALL_EXIT | \
_TIF_SYSCALL_TRACEPOINT )
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/*
* We stash processor id into a COP0 register to retrieve it fast
* at kernel exception entry .
*/
# if defined(CONFIG_MIPS_MT_SMTC)
# define SMP_CPUID_REG 2, 2 /* TCBIND */
# define ASM_SMP_CPUID_REG $2, 2
# define SMP_CPUID_PTRSHIFT 19
# elif defined(CONFIG_MIPS_PGD_C0_CONTEXT)
# define SMP_CPUID_REG 20, 0 /* XCONTEXT */
# define ASM_SMP_CPUID_REG $20
# define SMP_CPUID_PTRSHIFT 48
# else
# define SMP_CPUID_REG 4, 0 /* CONTEXT */
# define ASM_SMP_CPUID_REG $4
# define SMP_CPUID_PTRSHIFT 23
# endif
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# ifdef CONFIG_64BIT
# define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3)
# else
# define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2)
# endif
# ifdef CONFIG_MIPS_MT_SMTC
# define ASM_CPUID_MFC0 mfc0
# define UASM_i_CPUID_MFC0 uasm_i_mfc0
# else
# define ASM_CPUID_MFC0 MFC0
# define UASM_i_CPUID_MFC0 UASM_i_MFC0
# endif
# endif /* __KERNEL__ */
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# endif /* _ASM_THREAD_INFO_H */