1/* 2 * thread_info.h: sparc low-level thread information 3 * adapted from the ppc version by Pete Zaitcev, which was 4 * adapted from the i386 version by Paul Mackerras 5 * 6 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 7 * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com) 8 * - Incorporating suggestions made by Linus Torvalds and Dave Miller 9 */ 10 11#ifndef _ASM_THREAD_INFO_H 12#define _ASM_THREAD_INFO_H 13 14#ifdef __KERNEL__ 15 16#ifndef __ASSEMBLY__ 17 18#include <asm/ptrace.h> 19#include <asm/page.h> 20 21/* 22 * Low level task data. 23 * 24 * If you change this, change the TI_* offsets below to match. 25 */ 26#define NSWINS 8 27struct thread_info { 28 unsigned long uwinmask; 29 struct task_struct *task; /* main task structure */ 30 unsigned long flags; /* low level flags */ 31 int cpu; /* cpu we're on */ 32 int preempt_count; /* 0 => preemptable, 33 <0 => BUG */ 34 int softirq_count; 35 int hardirq_count; 36 37 u32 __unused; 38 39 /* Context switch saved kernel state. */ 40 unsigned long ksp; /* ... ksp __attribute__ ((aligned (8))); */ 41 unsigned long kpc; 42 unsigned long kpsr; 43 unsigned long kwim; 44 45 /* A place to store user windows and stack pointers 46 * when the stack needs inspection. 47 */ 48 struct reg_window32 reg_window[NSWINS]; /* align for ldd! */ 49 unsigned long rwbuf_stkptrs[NSWINS]; 50 unsigned long w_saved; 51}; 52 53/* 54 * macros/functions for gaining access to the thread information structure 55 */ 56#define INIT_THREAD_INFO(tsk) \ 57{ \ 58 .uwinmask = 0, \ 59 .task = &tsk, \ 60 .flags = 0, \ 61 .cpu = 0, \ 62 .preempt_count = INIT_PREEMPT_COUNT, \ 63} 64 65#define init_thread_info (init_thread_union.thread_info) 66#define init_stack (init_thread_union.stack) 67 68/* how to get the thread information struct from C */ 69register struct thread_info *current_thread_info_reg asm("g6"); 70#define current_thread_info() (current_thread_info_reg) 71 72/* 73 * thread information allocation 74 */ 75#define THREAD_SIZE_ORDER 1 76 77#endif /* __ASSEMBLY__ */ 78 79/* Size of kernel stack for each process */ 80#define THREAD_SIZE (2 * PAGE_SIZE) 81 82/* 83 * Offsets in thread_info structure, used in assembly code 84 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications. 85 */ 86#define TI_UWINMASK 0x00 /* uwinmask */ 87#define TI_TASK 0x04 88#define TI_FLAGS 0x08 89#define TI_CPU 0x0c 90#define TI_PREEMPT 0x10 /* preempt_count */ 91#define TI_SOFTIRQ 0x14 /* softirq_count */ 92#define TI_HARDIRQ 0x18 /* hardirq_count */ 93#define TI_KSP 0x20 /* ksp */ 94#define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */ 95#define TI_KPSR 0x28 /* kpsr */ 96#define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */ 97#define TI_REG_WINDOW 0x30 98#define TI_RWIN_SPTRS 0x230 99#define TI_W_SAVED 0x250 100 101/* 102 * thread information flag bit numbers 103 */ 104#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 105#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 106#define TIF_SIGPENDING 2 /* signal pending */ 107#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 108#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ 109#define TIF_USEDFPU 8 /* FPU was used by this task 110 * this quantum (SMP) */ 111#define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling 112 * TIF_NEED_RESCHED */ 113#define TIF_MEMDIE 10 /* is terminating due to OOM killer */ 114 115/* as above, but as bit values */ 116#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 117#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 118#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 119#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 120#define _TIF_USEDFPU (1<<TIF_USEDFPU) 121#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 122 123#define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \ 124 _TIF_SIGPENDING) 125 126#define is_32bit_task() (1) 127 128#endif /* __KERNEL__ */ 129 130#endif /* _ASM_THREAD_INFO_H */ 131