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dcd497f99a
The preempt_count member of struct thread_info is currently either defined as int, unsigned int or __s32 depending on arch. This patch makes the type of preempt_count an int on all archs. Having preempt_count be an unsigned type prevents the catching of preempt_count < 0 bugs, and using int on some archs and __s32 on others is not exactely "neat" - much nicer when it's just int all over. A previous version of this patch was already ACK'ed by Robert Love, and the only change in this version of the patch compared to the one he ACK'ed is that this one also makes sure the preempt_count member is consistently commented. Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
154 lines
4.4 KiB
C
154 lines
4.4 KiB
C
/*
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* thread_info.h: sparc low-level thread information
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* adapted from the ppc version by Pete Zaitcev, which was
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* adapted from the i386 version by Paul Mackerras
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*
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* Copyright (C) 2002 David Howells (dhowells@redhat.com)
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* Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
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* - Incorporating suggestions made by Linus Torvalds and Dave Miller
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*/
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#ifndef _ASM_THREAD_INFO_H
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#define _ASM_THREAD_INFO_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <asm/btfixup.h>
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#include <asm/ptrace.h>
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#include <asm/page.h>
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/*
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* Low level task data.
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*
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* If you change this, change the TI_* offsets below to match.
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*/
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#define NSWINS 8
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struct thread_info {
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unsigned long uwinmask;
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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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int cpu; /* cpu we're on */
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int preempt_count; /* 0 => preemptable,
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<0 => BUG */
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int softirq_count;
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int hardirq_count;
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/* Context switch saved kernel state. */
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unsigned long ksp; /* ... ksp __attribute__ ((aligned (8))); */
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unsigned long kpc;
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unsigned long kpsr;
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unsigned long kwim;
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/* A place to store user windows and stack pointers
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* when the stack needs inspection.
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*/
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struct reg_window reg_window[NSWINS]; /* align for ldd! */
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unsigned long rwbuf_stkptrs[NSWINS];
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unsigned long w_saved;
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struct restart_block restart_block;
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};
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/*
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* macros/functions for gaining access to the thread information structure
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*
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* preempt_count needs to be 1 initially, until the scheduler is functional.
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*/
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.uwinmask = 0, \
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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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.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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/* how to get the thread information struct from C */
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register struct thread_info *current_thread_info_reg asm("g6");
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#define current_thread_info() (current_thread_info_reg)
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/*
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* thread information allocation
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*/
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#if PAGE_SHIFT == 13
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#define THREAD_INFO_ORDER 0
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#else /* PAGE_SHIFT */
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#define THREAD_INFO_ORDER 1
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#endif
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BTFIXUPDEF_CALL(struct thread_info *, alloc_thread_info, void)
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#define alloc_thread_info(tsk) BTFIXUP_CALL(alloc_thread_info)()
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BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
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#define free_thread_info(ti) BTFIXUP_CALL(free_thread_info)(ti)
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#define get_thread_info(ti) get_task_struct((ti)->task)
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#define put_thread_info(ti) put_task_struct((ti)->task)
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#endif /* __ASSEMBLY__ */
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/*
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* Size of kernel stack for each process.
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* Observe the order of get_free_pages() in alloc_thread_info().
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* The sun4 has 8K stack too, because it's short on memory, and 16K is a waste.
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*/
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#define THREAD_SIZE 8192
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/*
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* Offsets in thread_info structure, used in assembly code
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* The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
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*/
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#define TI_UWINMASK 0x00 /* uwinmask */
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#define TI_TASK 0x04
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#define TI_EXECDOMAIN 0x08 /* exec_domain */
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#define TI_FLAGS 0x0c
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#define TI_CPU 0x10
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#define TI_PREEMPT 0x14 /* preempt_count */
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#define TI_SOFTIRQ 0x18 /* softirq_count */
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#define TI_HARDIRQ 0x1c /* hardirq_count */
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#define TI_KSP 0x20 /* ksp */
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#define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */
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#define TI_KPSR 0x28 /* kpsr */
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#define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */
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#define TI_REG_WINDOW 0x30
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#define TI_RWIN_SPTRS 0x230
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#define TI_W_SAVED 0x250
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/* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
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#define PREEMPT_ACTIVE 0x4000000
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/*
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* thread information flag bit numbers
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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 /* resumption notification requested */
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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_USEDFPU 8 /* FPU was used by this task
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* this quantum (SMP) */
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#define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling
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* TIF_NEED_RESCHED */
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#define TIF_MEMDIE 10
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/* as above, but as bit values */
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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_NEED_RESCHED (1<<TIF_NEED_RESCHED)
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#define _TIF_USEDFPU (1<<TIF_USEDFPU)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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