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 27 struct thread_info { 28 unsigned long uwinmask; 29 struct task_struct *task; /* main task structure */ 30 struct exec_domain *exec_domain; /* execution domain */ 31 unsigned long flags; /* low level flags */ 32 int cpu; /* cpu we're on */ 33 int preempt_count; /* 0 => preemptable, 34 <0 => BUG */ 35 int softirq_count; 36 int hardirq_count; 37 38 /* Context switch saved kernel state. */ 39 unsigned long ksp; /* ... ksp __attribute__ ((aligned (8))); */ 40 unsigned long kpc; 41 unsigned long kpsr; 42 unsigned long kwim; 43 44 /* A place to store user windows and stack pointers 45 * when the stack needs inspection. 46 */ 47 struct reg_window32 reg_window[NSWINS]; /* align for ldd! */ 48 unsigned long rwbuf_stkptrs[NSWINS]; 49 unsigned long w_saved; 50 51 struct restart_block restart_block; 52 }; 53 54 /* 55 * macros/functions for gaining access to the thread information structure 56 */ 57 #define INIT_THREAD_INFO(tsk) \ 58 { \ 59 .uwinmask = 0, \ 60 .task = &tsk, \ 61 .exec_domain = &default_exec_domain, \ 62 .flags = 0, \ 63 .cpu = 0, \ 64 .preempt_count = INIT_PREEMPT_COUNT, \ 65 .restart_block = { \ 66 .fn = do_no_restart_syscall, \ 67 }, \ 68 } 69 70 #define init_thread_info (init_thread_union.thread_info) 71 #define init_stack (init_thread_union.stack) 72 73 /* how to get the thread information struct from C */ 74 register struct thread_info *current_thread_info_reg asm("g6"); 75 #define current_thread_info() (current_thread_info_reg) 76 77 /* 78 * thread information allocation 79 */ 80 #define THREAD_INFO_ORDER 1 81 82 struct thread_info * alloc_thread_info_node(struct task_struct *tsk, int node); 83 void free_thread_info(struct thread_info *); 84 85 #endif /* __ASSEMBLY__ */ 86 87 /* 88 * Size of kernel stack for each process. 89 * Observe the order of get_free_pages() in alloc_thread_info_node(). 90 * The sun4 has 8K stack too, because it's short on memory, and 16K is a waste. 91 */ 92 #define THREAD_SIZE (2 * PAGE_SIZE) 93 94 /* 95 * Offsets in thread_info structure, used in assembly code 96 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications. 97 */ 98 #define TI_UWINMASK 0x00 /* uwinmask */ 99 #define TI_TASK 0x04 100 #define TI_EXECDOMAIN 0x08 /* exec_domain */ 101 #define TI_FLAGS 0x0c 102 #define TI_CPU 0x10 103 #define TI_PREEMPT 0x14 /* preempt_count */ 104 #define TI_SOFTIRQ 0x18 /* softirq_count */ 105 #define TI_HARDIRQ 0x1c /* hardirq_count */ 106 #define TI_KSP 0x20 /* ksp */ 107 #define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */ 108 #define TI_KPSR 0x28 /* kpsr */ 109 #define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */ 110 #define TI_REG_WINDOW 0x30 111 #define TI_RWIN_SPTRS 0x230 112 #define TI_W_SAVED 0x250 113 /* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */ 114 115 #define PREEMPT_ACTIVE 0x4000000 116 117 /* 118 * thread information flag bit numbers 119 */ 120 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 121 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 122 #define TIF_SIGPENDING 2 /* signal pending */ 123 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 124 #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ 125 #define TIF_USEDFPU 8 /* FPU was used by this task 126 * this quantum (SMP) */ 127 #define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling 128 * TIF_NEED_RESCHED */ 129 #define TIF_MEMDIE 10 /* is terminating due to OOM killer */ 130 131 /* as above, but as bit values */ 132 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 133 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 134 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 135 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 136 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 137 #define _TIF_USEDFPU (1<<TIF_USEDFPU) 138 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 139 140 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \ 141 _TIF_SIGPENDING | \ 142 _TIF_RESTORE_SIGMASK) 143 144 #endif /* __KERNEL__ */ 145 146 #endif /* _ASM_THREAD_INFO_H */ 147