author | Florian Westphal <fw@strlen.de> |
Sun, 11 Jan 2009 20:20:11 +0100 | |
changeset 0 | aa628870c1d3 |
child 2 | d1f6d8b6f81c |
permissions | -rw-r--r-- |
0
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Port of Linux 2.6.28 for use with network simulation cradle.
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/* thread_info.h: low-level thread information |
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* Copyright (C) 2002 David Howells (dhowells@redhat.com) |
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* - Incorporating suggestions made by Linus Torvalds and Dave Miller |
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Port of Linux 2.6.28 for use with network simulation cradle.
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*/ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
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Port of Linux 2.6.28 for use with network simulation cradle.
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#ifndef _ASM_X86_THREAD_INFO_H |
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#define _ASM_X86_THREAD_INFO_H |
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#include <linux/compiler.h> |
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#include <asm/page.h> |
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#include <asm/types.h> |
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|
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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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*/ |
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#ifndef __ASSEMBLY__ |
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struct task_struct; |
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struct exec_domain; |
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#include <asm/processor.h> |
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|
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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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__u32 status; /* thread synchronous flags */ |
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__u32 cpu; /* current CPU */ |
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int preempt_count; /* 0 => preemptable, |
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<0 => BUG */ |
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mm_segment_t addr_limit; |
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struct restart_block restart_block; |
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void __user *sysenter_return; |
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#ifdef CONFIG_X86_32 |
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unsigned long previous_esp; /* ESP of the previous stack in |
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case of nested (IRQ) stacks |
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*/ |
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__u8 supervisor_stack[0]; |
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#endif |
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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 = 1, \ |
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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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#else /* !__ASSEMBLY__ */ |
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#include <asm/asm-offsets.h> |
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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 |
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* may 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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* Warning: layout of LSW is hardcoded in entry.S |
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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 /* callback before returning to user */ |
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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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#define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/ |
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#define TIF_IRET 5 /* force IRET */ |
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#define TIF_SYSCALL_EMU 6 /* syscall emulation active */ |
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#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ |
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#define TIF_SECCOMP 8 /* secure computing */ |
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#define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */ |
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#define TIF_NOTSC 16 /* TSC is not accessible in userland */ |
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#define TIF_IA32 17 /* 32bit process */ |
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#define TIF_FORK 18 /* ret_from_fork */ |
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#define TIF_ABI_PENDING 19 |
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#define TIF_MEMDIE 20 |
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#define TIF_DEBUG 21 /* uses debug registers */ |
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#define TIF_IO_BITMAP 22 /* uses I/O bitmap */ |
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#define TIF_FREEZE 23 /* is freezing for suspend */ |
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#define TIF_FORCED_TF 24 /* true if TF in eflags artificially */ |
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#define TIF_DEBUGCTLMSR 25 /* uses thread_struct.debugctlmsr */ |
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#define TIF_DS_AREA_MSR 26 /* uses thread_struct.ds_area_msr */ |
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#define TIF_BTS_TRACE_TS 27 /* record scheduling event timestamps */ |
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|
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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_SINGLESTEP (1 << TIF_SINGLESTEP) |
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#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) |
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#define _TIF_IRET (1 << TIF_IRET) |
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#define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU) |
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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_MCE_NOTIFY (1 << TIF_MCE_NOTIFY) |
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#define _TIF_NOTSC (1 << TIF_NOTSC) |
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#define _TIF_IA32 (1 << TIF_IA32) |
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#define _TIF_FORK (1 << TIF_FORK) |
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#define _TIF_ABI_PENDING (1 << TIF_ABI_PENDING) |
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#define _TIF_DEBUG (1 << TIF_DEBUG) |
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#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP) |
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#define _TIF_FREEZE (1 << TIF_FREEZE) |
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#define _TIF_FORCED_TF (1 << TIF_FORCED_TF) |
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#define _TIF_DEBUGCTLMSR (1 << TIF_DEBUGCTLMSR) |
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#define _TIF_DS_AREA_MSR (1 << TIF_DS_AREA_MSR) |
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#define _TIF_BTS_TRACE_TS (1 << TIF_BTS_TRACE_TS) |
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|
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/* work to do in syscall_trace_enter() */ |
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#define _TIF_WORK_SYSCALL_ENTRY \ |
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(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | \ |
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_TIF_SYSCALL_AUDIT | _TIF_SECCOMP | _TIF_SINGLESTEP) |
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|
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/* work to do in syscall_trace_leave() */ |
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#define _TIF_WORK_SYSCALL_EXIT \ |
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(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP) |
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126 |
|
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/* work to do on interrupt/exception return */ |
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#define _TIF_WORK_MASK \ |
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(0x0000FFFF & \ |
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~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT| \ |
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_TIF_SINGLESTEP|_TIF_SECCOMP|_TIF_SYSCALL_EMU)) |
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|
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/* work to do on any return to user space */ |
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#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP) |
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|
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/* Only used for 64 bit */ |
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#define _TIF_DO_NOTIFY_MASK \ |
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(_TIF_SIGPENDING|_TIF_MCE_NOTIFY|_TIF_NOTIFY_RESUME) |
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|
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140 |
/* flags to check in __switch_to() */ |
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141 |
#define _TIF_WORK_CTXSW \ |
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(_TIF_IO_BITMAP|_TIF_DEBUGCTLMSR|_TIF_DS_AREA_MSR|_TIF_BTS_TRACE_TS| \ |
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143 |
_TIF_NOTSC) |
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|
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#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW |
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#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG) |
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|
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#define PREEMPT_ACTIVE 0x10000000 |
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|
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/* thread information allocation */ |
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#ifdef CONFIG_DEBUG_STACK_USAGE |
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#define THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO) |
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#else |
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#define THREAD_FLAGS GFP_KERNEL |
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#endif |
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|
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#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR |
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|
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159 |
#define alloc_thread_info(tsk) \ |
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160 |
((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER)) |
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161 |
|
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162 |
#ifdef CONFIG_X86_32 |
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163 |
|
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#define STACK_WARN (THREAD_SIZE/8) |
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165 |
/* |
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166 |
* macros/functions for gaining access to the thread information structure |
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167 |
* |
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* preempt_count needs to be 1 initially, until the scheduler is functional. |
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169 |
*/ |
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170 |
#ifndef __ASSEMBLY__ |
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171 |
|
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172 |
|
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173 |
/* how to get the current stack pointer from C */ |
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174 |
register unsigned long current_stack_pointer asm("esp") __used; |
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175 |
|
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176 |
/* how to get the thread information struct from C */ |
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177 |
static inline struct thread_info *current_thread_info(void) |
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178 |
{ |
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179 |
#ifdef CONFIG_NSC |
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extern struct thread_info *nsc_get_current_thread_info(void); |
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181 |
return nsc_get_current_thread_info(); |
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182 |
#else |
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183 |
return (struct thread_info *) |
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184 |
(current_stack_pointer & ~(THREAD_SIZE - 1)); |
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185 |
#endif |
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186 |
} |
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187 |
|
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188 |
#else /* !__ASSEMBLY__ */ |
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189 |
|
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190 |
/* how to get the thread information struct from ASM */ |
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191 |
#define GET_THREAD_INFO(reg) \ |
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192 |
movl $-THREAD_SIZE, reg; \ |
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193 |
andl %esp, reg |
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194 |
|
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195 |
/* use this one if reg already contains %esp */ |
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196 |
#define GET_THREAD_INFO_WITH_ESP(reg) \ |
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197 |
andl $-THREAD_SIZE, reg |
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198 |
|
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199 |
#endif |
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200 |
|
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201 |
#else /* X86_32 */ |
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202 |
|
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203 |
#include <asm/pda.h> |
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204 |
|
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205 |
/* |
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206 |
* macros/functions for gaining access to the thread information structure |
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207 |
* preempt_count needs to be 1 initially, until the scheduler is functional. |
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208 |
*/ |
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209 |
#ifndef __ASSEMBLY__ |
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210 |
static inline struct thread_info *current_thread_info(void) |
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211 |
{ |
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212 |
#ifdef CONFIG_NSC |
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213 |
extern struct thread_info *nsc_get_current_thread_info(void); |
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214 |
return nsc_get_current_thread_info(); |
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215 |
#else |
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216 |
|
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217 |
struct thread_info *ti; |
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ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE); |
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219 |
return ti; |
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220 |
#endif |
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221 |
} |
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222 |
|
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223 |
/* do not use in interrupt context */ |
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static inline struct thread_info *stack_thread_info(void) |
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{ |
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#ifdef CONFIG_NSC |
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extern struct thread_info *nsc_get_current_thread_info(void); |
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return nsc_get_current_thread_info(); |
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#else |
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struct thread_info *ti; |
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asm("andq %%rsp,%0; " : "=r" (ti) : "0" (~(THREAD_SIZE - 1))); |
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return ti; |
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#endif |
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} |
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|
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#else /* !__ASSEMBLY__ */ |
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|
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/* how to get the thread information struct from ASM */ |
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#define GET_THREAD_INFO(reg) \ |
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movq %gs:pda_kernelstack,reg ; \ |
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subq $(THREAD_SIZE-PDA_STACKOFFSET),reg |
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|
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#endif |
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|
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#endif /* !X86_32 */ |
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|
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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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#define TS_USEDFPU 0x0001 /* FPU was used by this task |
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this quantum (SMP) */ |
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#define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/ |
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#define TS_POLLING 0x0004 /* true if in idle loop |
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and not sleeping */ |
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#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */ |
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#define TS_XSAVE 0x0010 /* Use xsave/xrstor */ |
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|
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#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING) |
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|
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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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set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags); |
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} |
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#endif /* !__ASSEMBLY__ */ |
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|
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#ifndef __ASSEMBLY__ |
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extern void arch_task_cache_init(void); |
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extern void free_thread_info(struct thread_info *ti); |
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extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); |
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#define arch_task_cache_init arch_task_cache_init |
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#endif |
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#endif /* _ASM_X86_THREAD_INFO_H */ |