1 #ifndef _ASM_M68K_THREAD_INFO_H 2 #define _ASM_M68K_THREAD_INFO_H 3 4 #include <asm/types.h> 5 #include <asm/page.h> 6 #include <asm/segment.h> 7 8 /* 9 * On machines with 4k pages we default to an 8k thread size, though we 10 * allow a 4k with config option. Any other machine page size then 11 * the thread size must match the page size (which is 8k and larger here). 12 */ 13 #if PAGE_SHIFT < 13 14 #ifdef CONFIG_4KSTACKS 15 #define THREAD_SIZE 4096 16 #else 17 #define THREAD_SIZE 8192 18 #endif 19 #else 20 #define THREAD_SIZE PAGE_SIZE 21 #endif 22 #define THREAD_SIZE_ORDER ((THREAD_SIZE / PAGE_SIZE) - 1) 23 24 #ifndef __ASSEMBLY__ 25 26 struct thread_info { 27 struct task_struct *task; /* main task structure */ 28 unsigned long flags; 29 struct exec_domain *exec_domain; /* execution domain */ 30 mm_segment_t addr_limit; /* thread address space */ 31 int preempt_count; /* 0 => preemptable, <0 => BUG */ 32 __u32 cpu; /* should always be 0 on m68k */ 33 unsigned long tp_value; /* thread pointer */ 34 struct restart_block restart_block; 35 }; 36 #endif /* __ASSEMBLY__ */ 37 38 #define PREEMPT_ACTIVE 0x4000000 39 40 #define INIT_THREAD_INFO(tsk) \ 41 { \ 42 .task = &tsk, \ 43 .exec_domain = &default_exec_domain, \ 44 .addr_limit = KERNEL_DS, \ 45 .preempt_count = INIT_PREEMPT_COUNT, \ 46 .restart_block = { \ 47 .fn = do_no_restart_syscall, \ 48 }, \ 49 } 50 51 #define init_stack (init_thread_union.stack) 52 53 #ifndef __ASSEMBLY__ 54 /* how to get the thread information struct from C */ 55 static inline struct thread_info *current_thread_info(void) 56 { 57 struct thread_info *ti; 58 __asm__( 59 "move.l %%sp, %0 \n\t" 60 "and.l %1, %0" 61 : "=&d"(ti) 62 : "di" (~(THREAD_SIZE-1)) 63 ); 64 return ti; 65 } 66 #endif 67 68 #define init_thread_info (init_thread_union.thread_info) 69 70 /* entry.S relies on these definitions! 71 * bits 0-7 are tested at every exception exit 72 * bits 8-15 are also tested at syscall exit 73 */ 74 #define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ 75 #define TIF_SIGPENDING 6 /* signal pending */ 76 #define TIF_NEED_RESCHED 7 /* rescheduling necessary */ 77 #define TIF_DELAYED_TRACE 14 /* single step a syscall */ 78 #define TIF_SYSCALL_TRACE 15 /* syscall trace active */ 79 #define TIF_MEMDIE 16 /* is terminating due to OOM killer */ 80 #define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal */ 81 82 #endif /* _ASM_M68K_THREAD_INFO_H */ 83