arch/powerpc/include/asm/thread_info.h

Source file repositories/reference/linux-study-clean/arch/powerpc/include/asm/thread_info.h

File Facts

System
Linux kernel
Corpus path
arch/powerpc/include/asm/thread_info.h
Extension
.h
Size
7854 bytes
Lines
240
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct thread_info {
	int		preempt_count;		/* 0 => preemptable,
						   <0 => BUG */
#ifdef CONFIG_SMP
	unsigned int	cpu;
#endif
	unsigned long	syscall_work;		/* SYSCALL_WORK_ flags */
	unsigned long	local_flags;		/* private flags for thread */
#ifdef CONFIG_LIVEPATCH_64
	unsigned long *livepatch_sp;
#endif
#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
	struct cpu_accounting_data accounting;
#endif
	unsigned char slb_preload_nr;
	unsigned char slb_preload_tail;
	u32 slb_preload_esid[SLB_PRELOAD_NR];

	/* low level flags - has atomic operations done on it */
	unsigned long	flags ____cacheline_aligned_in_smp;
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.preempt_count = INIT_PREEMPT_COUNT,	\
	.flags =	0,			\
}

#define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)

/* how to get the thread information struct from C */
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);

void arch_setup_new_exec(void);
#define arch_setup_new_exec arch_setup_new_exec

#endif /* __ASSEMBLER__ */

/*
 * thread information flag bit numbers
 */
#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
#define TIF_SIGPENDING		1	/* signal pending */
#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
#define TIF_NOTIFY_SIGNAL	3	/* signal notifications exist */
#define TIF_SYSCALL_EMU		4	/* syscall emulation active */
#define TIF_RESTORE_TM		5	/* need to restore TM FP/VEC/VSX */
#define TIF_PATCH_PENDING	6	/* pending live patching update */
#define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
#define TIF_SINGLESTEP		8	/* singlestepping active */
#define TIF_NEED_RESCHED_LAZY	9       /* Scheduler driven lazy preemption */
#define TIF_SECCOMP		10	/* secure computing */
#define TIF_RESTOREALL		11	/* Restore all regs (implies NOERROR) */
#define TIF_NOERROR		12	/* Force successful syscall return */
#define TIF_NOTIFY_RESUME	13	/* callback before returning to user */
#define TIF_UPROBE		14	/* breakpointed or single-stepping */
#define TIF_SYSCALL_TRACEPOINT	15	/* syscall tracepoint instrumentation */
#define TIF_EMULATE_STACK_STORE	16	/* Is an instruction emulation
						for stack store? */
#define TIF_MEMDIE		17	/* is terminating due to OOM killer */
#if defined(CONFIG_PPC64)
#define TIF_ELF2ABI		18	/* function descriptors must die! */
#endif
#define TIF_POLLING_NRFLAG	19	/* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_32BIT		20	/* 32 bit binary */

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
#define _TIF_NEED_RESCHED_LAZY	(1<<TIF_NEED_RESCHED_LAZY)
#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
#define _TIF_32BIT		(1<<TIF_32BIT)
#define _TIF_RESTORE_TM		(1<<TIF_RESTORE_TM)
#define _TIF_PATCH_PENDING	(1<<TIF_PATCH_PENDING)
#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
#define _TIF_RESTOREALL		(1<<TIF_RESTOREALL)
#define _TIF_NOERROR		(1<<TIF_NOERROR)
#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
#define _TIF_UPROBE		(1<<TIF_UPROBE)
#define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)
#define _TIF_EMULATE_STACK_STORE	(1<<TIF_EMULATE_STACK_STORE)
#define _TIF_SYSCALL_EMU	(1<<TIF_SYSCALL_EMU)
#define _TIF_SYSCALL_DOTRACE	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \

Annotation

Implementation Notes