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/btfixup.h> 19#include <asm/ptrace.h> 20#include <asm/page.h> 21 22/* 23 * Low level task data. 24 * 25 * If you change this, change the TI_* offsets below to match. 26 */ 27#define NSWINS 8 28struct thread_info { 29 unsigned long uwinmask; 30 struct task_struct *task; /* main task structure */ 31 struct exec_domain *exec_domain; /* execution domain */ 32 unsigned long flags; /* low level flags */ 33 int cpu; /* cpu we're on */ 34 int preempt_count; /* 0 => preemptable, 35 <0 => BUG */ 36 int softirq_count; 37 int hardirq_count; 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 struct restart_block restart_block; 53}; 54 55/* 56 * macros/functions for gaining access to the thread information structure 57 */ 58#define INIT_THREAD_INFO(tsk) \ 59{ \ 60 .uwinmask = 0, \ 61 .task = &tsk, \ 62 .exec_domain = &default_exec_domain, \ 63 .flags = 0, \ 64 .cpu = 0, \ 65 .preempt_count = INIT_PREEMPT_COUNT, \ 66 .restart_block = { \ 67 .fn = do_no_restart_syscall, \ 68 }, \ 69} 70 71#define init_thread_info (init_thread_union.thread_info) 72#define init_stack (init_thread_union.stack) 73 74/* how to get the thread information struct from C */ 75register struct thread_info *current_thread_info_reg asm("g6"); 76#define current_thread_info() (current_thread_info_reg) 77 78/* 79 * thread information allocation 80 */ 81#define THREAD_INFO_ORDER 1 82 83#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 84 85BTFIXUPDEF_CALL(struct thread_info *, alloc_thread_info, void) 86#define alloc_thread_info(tsk) BTFIXUP_CALL(alloc_thread_info)() 87 88BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *) 89#define free_thread_info(ti) BTFIXUP_CALL(free_thread_info)(ti) 90 91#endif /* __ASSEMBLY__ */ 92 93/* 94 * Size of kernel stack for each process. 95 * Observe the order of get_free_pages() in alloc_thread_info(). 96 * The sun4 has 8K stack too, because it's short on memory, and 16K is a waste. 97 */ 98#define THREAD_SIZE 8192 99 100/* 101 * Offsets in thread_info structure, used in assembly code 102 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications. 103 */ 104#define TI_UWINMASK 0x00 /* uwinmask */ 105#define TI_TASK 0x04 106#define TI_EXECDOMAIN 0x08 /* exec_domain */ 107#define TI_FLAGS 0x0c 108#define TI_CPU 0x10 109#define TI_PREEMPT 0x14 /* preempt_count */ 110#define TI_SOFTIRQ 0x18 /* softirq_count */ 111#define TI_HARDIRQ 0x1c /* hardirq_count */ 112#define TI_KSP 0x20 /* ksp */ 113#define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */ 114#define TI_KPSR 0x28 /* kpsr */ 115#define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */ 116#define TI_REG_WINDOW 0x30 117#define TI_RWIN_SPTRS 0x230 118#define TI_W_SAVED 0x250 119/* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */ 120 121#define PREEMPT_ACTIVE 0x4000000 122 123/* 124 * thread information flag bit numbers 125 */ 126#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 127#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 128#define TIF_SIGPENDING 2 /* signal pending */ 129#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 130#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ 131#define TIF_USEDFPU 8 /* FPU was used by this task 132 * this quantum (SMP) */ 133#define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling 134 * TIF_NEED_RESCHED */ 135#define TIF_MEMDIE 10 /* is terminating due to OOM killer */ 136#define TIF_FREEZE 11 /* is freezing for suspend */ 137 138/* as above, but as bit values */ 139#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 140#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 141#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 142#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 143#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 144#define _TIF_USEDFPU (1<<TIF_USEDFPU) 145#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 146 147#define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \ 148 _TIF_SIGPENDING | \ 149 _TIF_RESTORE_SIGMASK) 150#define _TIF_FREEZE (1<<TIF_FREEZE) 151 152#endif /* __KERNEL__ */ 153 154#endif /* _ASM_THREAD_INFO_H */ 155