/* thread_info.h: PowerPC low-level thread information * adapted from the i386 version by Paul Mackerras * * Copyright (C) 2002  David Howells (dhowells@redhat.com) * - Incorporating suggestions made by Linus Torvalds and Dave Miller */ #ifndef _ASM_POWERPC_THREAD_INFO_H#define _ASM_POWERPC_THREAD_INFO_H #ifdef __KERNEL__ /* We have 8k stacks on ppc32 and 16k on ppc64 */ #ifdef CONFIG_PPC64#define THREAD_SHIFT		14#else#define THREAD_SHIFT		13#endif #define THREAD_SIZE		(1 << THREAD_SHIFT) #ifndef __ASSEMBLY__#include <linux/cache.h>#include <asm/processor.h>#include <asm/page.h>#include <linux/stringify.h> /* * low level task data. */struct thread_info {	struct task_struct *task;		/* main task structure */	struct exec_domain *exec_domain;	/* execution domain */	int		cpu;			/* cpu we're on */	int		preempt_count;		/* 0 => preemptable,						   <0 => BUG */	struct restart_block restart_block;	unsigned long	local_flags;		/* private flags for thread */ 	/* 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 * * preempt_count needs to be 1 initially, until the scheduler is functional. */#define INIT_THREAD_INFO(tsk)			\{						\	.task =		&tsk,			\	.exec_domain =	&default_exec_domain,	\	.cpu =		0,			\	.preempt_count = 1,			\	.restart_block = {			\		.fn = do_no_restart_syscall,	\	},					\	.flags =	0,			\} #define init_thread_info	(init_thread_union.thread_info)#define init_stack		(init_thread_union.stack) /* thread information allocation */ #if THREAD_SHIFT >= PAGE_SHIFT #define THREAD_ORDER	(THREAD_SHIFT - PAGE_SHIFT) #ifdef CONFIG_DEBUG_STACK_USAGE#define alloc_thread_info(tsk)	\	((struct thread_info *)__get_free_pages(GFP_KERNEL | \		__GFP_ZERO, THREAD_ORDER))#else#define alloc_thread_info(tsk)	\	((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_ORDER))#endif#define free_thread_info(ti)	free_pages((unsigned long)ti, THREAD_ORDER) #else /* THREAD_SHIFT < PAGE_SHIFT */ #ifdef CONFIG_DEBUG_STACK_USAGE#define alloc_thread_info(tsk)	kzalloc(THREAD_SIZE, GFP_KERNEL)#else#define alloc_thread_info(tsk)	kmalloc(THREAD_SIZE, GFP_KERNEL)#endif#define free_thread_info(ti)	kfree(ti) #endif /* THREAD_SHIFT < PAGE_SHIFT */ /* how to get the thread information struct from C */static inline struct thread_info *current_thread_info(void){	register unsigned long sp asm("r1"); 	/* gcc4, at least, is smart enough to turn this into a single	 * rlwinm for ppc32 and clrrdi for ppc64 */	return (struct thread_info *)(sp & ~(THREAD_SIZE-1));} #endif /* __ASSEMBLY__ */ #define PREEMPT_ACTIVE		0x10000000 /* * thread information flag bit numbers */#define TIF_SYSCALL_TRACE	0	/* syscall trace active */#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */#define TIF_SIGPENDING		2	/* signal pending */#define TIF_NEED_RESCHED	3	/* rescheduling necessary */#define TIF_POLLING_NRFLAG	4	/* true if poll_idle() is polling					   TIF_NEED_RESCHED */#define TIF_32BIT		5	/* 32 bit binary */#define TIF_RUNLATCH		6	/* Is the runlatch enabled? */#define TIF_ABI_PENDING		7	/* 32/64 bit switch needed */#define TIF_SYSCALL_AUDIT	8	/* syscall auditing active */#define TIF_SINGLESTEP		9	/* singlestepping active */#define TIF_MEMDIE		10#define TIF_SECCOMP		11	/* secure computing */#define TIF_RESTOREALL		12	/* Restore all regs (implies NOERROR) */#define TIF_NOERROR		14	/* Force successful syscall return */#define TIF_RESTORE_SIGMASK	15	/* Restore signal mask in do_signal */ /* as above, but as bit values */#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)#define _TIF_32BIT		(1<<TIF_32BIT)#define _TIF_RUNLATCH		(1<<TIF_RUNLATCH)#define _TIF_ABI_PENDING	(1<<TIF_ABI_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_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)#define _TIF_SYSCALL_T_OR_A	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP) #define _TIF_USER_WORK_MASK	(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \				 _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK)#define _TIF_PERSYSCALL_MASK	(_TIF_RESTOREALL|_TIF_NOERROR) /* Bits in local_flags *//* Don't move TLF_NAPPING without adjusting the code in entry_32.S */#define TLF_NAPPING		0	/* idle thread enabled NAP mode */ #define _TLF_NAPPING		(1 << TLF_NAPPING) #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_THREAD_INFO_H */