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/*
* 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/btfixup.h>
#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_window 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
*
* preempt_count needs to be 1 initially, until the scheduler is functional.
*/
#define INIT_THREAD_INFO(tsk) \
{ \
.uwinmask = 0, \
.task = &tsk, \
.exec_domain = &default_exec_domain, \
.flags = 0, \
.cpu = 0, \
.preempt_count = 1, \
.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
*/
#if PAGE_SHIFT == 13
#define THREAD_INFO_ORDER 0
#else /* PAGE_SHIFT */
#define THREAD_INFO_ORDER 1
#endif
BTFIXUPDEF_CALL(struct thread_info *, alloc_thread_info, void)
#define alloc_thread_info(tsk) BTFIXUP_CALL(alloc_thread_info)()
BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
#define free_thread_info(ti) BTFIXUP_CALL(free_thread_info)(ti)
#endif /* __ASSEMBLY__ */
/*
* Size of kernel stack for each process.
* Observe the order of get_free_pages() in alloc_thread_info().
* The sun4 has 8K stack too, because it's short on memory, and 16K is a waste.
*/
#define THREAD_SIZE 8192
/*
* 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 */
/* flag bit 1 is available */
#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
/* 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_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
#define _TIF_USEDFPU (1<<TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#endif /* __KERNEL__ */
#endif /* _ASM_THREAD_INFO_H */
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