16a8016372
Make default just return 0. The current default (checking TIF_POLLING_NRFLAG) is taken to architectures that need it; ones that don't do polling in their idle threads don't need to defined TIF_POLLING_NRFLAG at all. ia64 defined both TS_POLLING (used by its tsk_is_polling()) and TIF_POLLING_NRFLAG (not used at all). Killed the latter... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
139 lines
4 KiB
C
139 lines
4 KiB
C
/*
|
|
* thread_info.h: sparc low-level thread information
|
|
* adapted from the ppc version by Pete Zaitcev, which was
|
|
* adapted from the i386 version by Paul Mackerras
|
|
*
|
|
* Copyright (C) 2002 David Howells (dhowells@redhat.com)
|
|
* Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.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/ptrace.h>
|
|
#include <asm/page.h>
|
|
|
|
/*
|
|
* Low level task data.
|
|
*
|
|
* If you change this, change the TI_* offsets below to match.
|
|
*/
|
|
#define NSWINS 8
|
|
struct thread_info {
|
|
unsigned long uwinmask;
|
|
struct task_struct *task; /* main task structure */
|
|
struct exec_domain *exec_domain; /* execution domain */
|
|
unsigned long flags; /* low level flags */
|
|
int cpu; /* cpu we're on */
|
|
int preempt_count; /* 0 => preemptable,
|
|
<0 => BUG */
|
|
int softirq_count;
|
|
int hardirq_count;
|
|
|
|
/* Context switch saved kernel state. */
|
|
unsigned long ksp; /* ... ksp __attribute__ ((aligned (8))); */
|
|
unsigned long kpc;
|
|
unsigned long kpsr;
|
|
unsigned long kwim;
|
|
|
|
/* A place to store user windows and stack pointers
|
|
* when the stack needs inspection.
|
|
*/
|
|
struct reg_window32 reg_window[NSWINS]; /* align for ldd! */
|
|
unsigned long rwbuf_stkptrs[NSWINS];
|
|
unsigned long w_saved;
|
|
|
|
struct restart_block restart_block;
|
|
};
|
|
|
|
/*
|
|
* macros/functions for gaining access to the thread information structure
|
|
*/
|
|
#define INIT_THREAD_INFO(tsk) \
|
|
{ \
|
|
.uwinmask = 0, \
|
|
.task = &tsk, \
|
|
.exec_domain = &default_exec_domain, \
|
|
.flags = 0, \
|
|
.cpu = 0, \
|
|
.preempt_count = INIT_PREEMPT_COUNT, \
|
|
.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 */
|
|
register struct thread_info *current_thread_info_reg asm("g6");
|
|
#define current_thread_info() (current_thread_info_reg)
|
|
|
|
/*
|
|
* thread information allocation
|
|
*/
|
|
#define THREAD_SIZE_ORDER 1
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
/* Size of kernel stack for each process */
|
|
#define THREAD_SIZE (2 * PAGE_SIZE)
|
|
|
|
/*
|
|
* Offsets in thread_info structure, used in assembly code
|
|
* The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
|
|
*/
|
|
#define TI_UWINMASK 0x00 /* uwinmask */
|
|
#define TI_TASK 0x04
|
|
#define TI_EXECDOMAIN 0x08 /* exec_domain */
|
|
#define TI_FLAGS 0x0c
|
|
#define TI_CPU 0x10
|
|
#define TI_PREEMPT 0x14 /* preempt_count */
|
|
#define TI_SOFTIRQ 0x18 /* softirq_count */
|
|
#define TI_HARDIRQ 0x1c /* hardirq_count */
|
|
#define TI_KSP 0x20 /* ksp */
|
|
#define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */
|
|
#define TI_KPSR 0x28 /* kpsr */
|
|
#define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */
|
|
#define TI_REG_WINDOW 0x30
|
|
#define TI_RWIN_SPTRS 0x230
|
|
#define TI_W_SAVED 0x250
|
|
/* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
|
|
|
|
#define PREEMPT_ACTIVE 0x4000000
|
|
|
|
/*
|
|
* thread information flag bit numbers
|
|
*/
|
|
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
|
|
#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
|
|
#define TIF_SIGPENDING 2 /* signal pending */
|
|
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
|
|
#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
|
|
#define TIF_USEDFPU 8 /* FPU was used by this task
|
|
* this quantum (SMP) */
|
|
#define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling
|
|
* TIF_NEED_RESCHED */
|
|
#define TIF_MEMDIE 10 /* is terminating due to OOM killer */
|
|
|
|
/* 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_USEDFPU (1<<TIF_USEDFPU)
|
|
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
|
|
|
|
#define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \
|
|
_TIF_SIGPENDING)
|
|
|
|
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_THREAD_INFO_H */
|