1#ifndef _ASM_M32R_THREAD_INFO_H 2#define _ASM_M32R_THREAD_INFO_H 3 4/* thread_info.h: m32r low-level thread information 5 * 6 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 7 * - Incorporating suggestions made by Linus Torvalds and Dave Miller 8 * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org> 9 */ 10 11#ifdef __KERNEL__ 12 13#ifndef __ASSEMBLY__ 14#include <asm/processor.h> 15#endif 16 17/* 18 * low level task data that entry.S needs immediate access to 19 * - this struct should fit entirely inside of one cache line 20 * - this struct shares the supervisor stack pages 21 * - if the contents of this structure are changed, the assembly constants must also be changed 22 */ 23#ifndef __ASSEMBLY__ 24 25struct thread_info { 26 struct task_struct *task; /* main task structure */ 27 struct exec_domain *exec_domain; /* execution domain */ 28 unsigned long flags; /* low level flags */ 29 unsigned long status; /* thread-synchronous flags */ 30 __u32 cpu; /* current CPU */ 31 int preempt_count; /* 0 => preemptable, <0 => BUG */ 32 33 mm_segment_t addr_limit; /* thread address space: 34 0-0xBFFFFFFF for user-thread 35 0-0xFFFFFFFF for kernel-thread 36 */ 37 struct restart_block restart_block; 38 39 __u8 supervisor_stack[0]; 40}; 41 42#else /* !__ASSEMBLY__ */ 43 44/* offsets into the thread_info struct for assembly code access */ 45#define TI_TASK 0x00000000 46#define TI_EXEC_DOMAIN 0x00000004 47#define TI_FLAGS 0x00000008 48#define TI_STATUS 0x0000000C 49#define TI_CPU 0x00000010 50#define TI_PRE_COUNT 0x00000014 51#define TI_ADDR_LIMIT 0x00000018 52#define TI_RESTART_BLOCK 0x000001C 53 54#endif 55 56#define PREEMPT_ACTIVE 0x10000000 57 58#define THREAD_SIZE (PAGE_SIZE << 1) 59 60/* 61 * macros/functions for gaining access to the thread information structure 62 */ 63#ifndef __ASSEMBLY__ 64 65#define INIT_THREAD_INFO(tsk) \ 66{ \ 67 .task = &tsk, \ 68 .exec_domain = &default_exec_domain, \ 69 .flags = 0, \ 70 .cpu = 0, \ 71 .preempt_count = INIT_PREEMPT_COUNT, \ 72 .addr_limit = KERNEL_DS, \ 73 .restart_block = { \ 74 .fn = do_no_restart_syscall, \ 75 }, \ 76} 77 78#define init_thread_info (init_thread_union.thread_info) 79#define init_stack (init_thread_union.stack) 80 81/* how to get the thread information struct from C */ 82static inline struct thread_info *current_thread_info(void) 83{ 84 struct thread_info *ti; 85 86 __asm__ __volatile__ ( 87 "ldi %0, #%1 \n\t" 88 "and %0, sp \n\t" 89 : "=r" (ti) : "i" (~(THREAD_SIZE - 1)) 90 ); 91 92 return ti; 93} 94 95#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 96 97/* thread information allocation */ 98#ifdef CONFIG_DEBUG_STACK_USAGE 99#define alloc_thread_info_node(tsk, node) \ 100 kzalloc_node(THREAD_SIZE, GFP_KERNEL, node) 101#else 102#define alloc_thread_info_node(tsk, node) \ 103 kmalloc_node(THREAD_SIZE, GFP_KERNEL, node) 104#endif 105 106#define free_thread_info(info) kfree(info) 107 108#define TI_FLAG_FAULT_CODE_SHIFT 28 109 110static inline void set_thread_fault_code(unsigned int val) 111{ 112 struct thread_info *ti = current_thread_info(); 113 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT))) 114 | (val << TI_FLAG_FAULT_CODE_SHIFT); 115} 116 117static inline unsigned int get_thread_fault_code(void) 118{ 119 struct thread_info *ti = current_thread_info(); 120 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT; 121} 122 123#endif 124 125/* 126 * thread information flags 127 * - these are process state flags that various assembly files may need to access 128 * - pending work-to-be-done flags are in LSW 129 * - other flags in MSW 130 */ 131#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 132#define TIF_SIGPENDING 1 /* signal pending */ 133#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 134#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */ 135#define TIF_IRET 4 /* return with iret */ 136#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ 137#define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal() */ 138#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 139#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 140#define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 141 142#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 143#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 144#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 145#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 146#define _TIF_IRET (1<<TIF_IRET) 147#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 148#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 149#define _TIF_USEDFPU (1<<TIF_USEDFPU) 150#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 151 152#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ 153#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */ 154 155/* 156 * Thread-synchronous status. 157 * 158 * This is different from the flags in that nobody else 159 * ever touches our thread-synchronous status, so we don't 160 * have to worry about atomic accesses. 161 */ 162#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */ 163 164#endif /* __KERNEL__ */ 165 166#endif /* _ASM_M32R_THREAD_INFO_H */ 167