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 28 struct 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 * preempt_count needs to be 1 initially, until the scheduler is functional. 59 */ 60 #define INIT_THREAD_INFO(tsk) \ 61 { \ 62 .uwinmask = 0, \ 63 .task = &tsk, \ 64 .exec_domain = &default_exec_domain, \ 65 .flags = 0, \ 66 .cpu = 0, \ 67 .preempt_count = 1, \ 68 .restart_block = { \ 69 .fn = do_no_restart_syscall, \ 70 }, \ 71 } 72 73 #define init_thread_info (init_thread_union.thread_info) 74 #define init_stack (init_thread_union.stack) 75 76 /* how to get the thread information struct from C */ 77 register struct thread_info *current_thread_info_reg asm("g6"); 78 #define current_thread_info() (current_thread_info_reg) 79 80 /* 81 * thread information allocation 82 */ 83 #define THREAD_INFO_ORDER 1 84 85 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 86 87 BTFIXUPDEF_CALL(struct thread_info *, alloc_thread_info, void) 88 #define alloc_thread_info(tsk) BTFIXUP_CALL(alloc_thread_info)() 89 90 BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *) 91 #define free_thread_info(ti) BTFIXUP_CALL(free_thread_info)(ti) 92 93 #endif /* __ASSEMBLY__ */ 94 95 /* 96 * Size of kernel stack for each process. 97 * Observe the order of get_free_pages() in alloc_thread_info(). 98 * The sun4 has 8K stack too, because it's short on memory, and 16K is a waste. 99 */ 100 #define THREAD_SIZE 8192 101 102 /* 103 * Offsets in thread_info structure, used in assembly code 104 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications. 105 */ 106 #define TI_UWINMASK 0x00 /* uwinmask */ 107 #define TI_TASK 0x04 108 #define TI_EXECDOMAIN 0x08 /* exec_domain */ 109 #define TI_FLAGS 0x0c 110 #define TI_CPU 0x10 111 #define TI_PREEMPT 0x14 /* preempt_count */ 112 #define TI_SOFTIRQ 0x18 /* softirq_count */ 113 #define TI_HARDIRQ 0x1c /* hardirq_count */ 114 #define TI_KSP 0x20 /* ksp */ 115 #define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */ 116 #define TI_KPSR 0x28 /* kpsr */ 117 #define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */ 118 #define TI_REG_WINDOW 0x30 119 #define TI_RWIN_SPTRS 0x230 120 #define TI_W_SAVED 0x250 121 /* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */ 122 123 #define PREEMPT_ACTIVE 0x4000000 124 125 /* 126 * thread information flag bit numbers 127 */ 128 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 129 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 130 #define TIF_SIGPENDING 2 /* signal pending */ 131 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 132 #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ 133 #define TIF_USEDFPU 8 /* FPU was used by this task 134 * this quantum (SMP) */ 135 #define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling 136 * TIF_NEED_RESCHED */ 137 #define TIF_MEMDIE 10 138 #define TIF_FREEZE 11 /* is freezing for suspend */ 139 140 /* as above, but as bit values */ 141 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 142 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 143 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 144 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 145 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 146 #define _TIF_USEDFPU (1<<TIF_USEDFPU) 147 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 148 149 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \ 150 _TIF_SIGPENDING | \ 151 _TIF_RESTORE_SIGMASK) 152 #define _TIF_FREEZE (1<<TIF_FREEZE) 153 154 #endif /* __KERNEL__ */ 155 156 #endif /* _ASM_THREAD_INFO_H */ 157