1#ifndef __ASM_SH_THREAD_INFO_H 2#define __ASM_SH_THREAD_INFO_H 3 4/* SuperH version 5 * Copyright (C) 2002 Niibe Yutaka 6 * 7 * The copyright of original i386 version is: 8 * 9 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 10 * - Incorporating suggestions made by Linus Torvalds and Dave Miller 11 */ 12#ifdef __KERNEL__ 13#include <asm/page.h> 14 15#ifndef __ASSEMBLY__ 16#include <asm/processor.h> 17 18struct thread_info { 19 struct task_struct *task; /* main task structure */ 20 struct exec_domain *exec_domain; /* execution domain */ 21 unsigned long flags; /* low level flags */ 22 __u32 cpu; 23 int preempt_count; /* 0 => preemptable, <0 => BUG */ 24 mm_segment_t addr_limit; /* thread address space */ 25 struct restart_block restart_block; 26 unsigned long previous_sp; /* sp of previous stack in case 27 of nested IRQ stacks */ 28 __u8 supervisor_stack[0]; 29}; 30 31#endif 32 33#define PREEMPT_ACTIVE 0x10000000 34 35#if defined(CONFIG_4KSTACKS) 36#define THREAD_SIZE_ORDER (0) 37#elif defined(CONFIG_PAGE_SIZE_4KB) 38#define THREAD_SIZE_ORDER (1) 39#elif defined(CONFIG_PAGE_SIZE_8KB) 40#define THREAD_SIZE_ORDER (1) 41#elif defined(CONFIG_PAGE_SIZE_64KB) 42#define THREAD_SIZE_ORDER (0) 43#else 44#error "Unknown thread size" 45#endif 46 47#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 48#define STACK_WARN (THREAD_SIZE >> 3) 49 50/* 51 * macros/functions for gaining access to the thread information structure 52 */ 53#ifndef __ASSEMBLY__ 54#define INIT_THREAD_INFO(tsk) \ 55{ \ 56 .task = &tsk, \ 57 .exec_domain = &default_exec_domain, \ 58 .flags = 0, \ 59 .cpu = 0, \ 60 .preempt_count = 1, \ 61 .addr_limit = KERNEL_DS, \ 62 .restart_block = { \ 63 .fn = do_no_restart_syscall, \ 64 }, \ 65} 66 67#define init_thread_info (init_thread_union.thread_info) 68#define init_stack (init_thread_union.stack) 69 70/* how to get the current stack pointer from C */ 71register unsigned long current_stack_pointer asm("r15") __attribute_used__; 72 73/* how to get the thread information struct from C */ 74static inline struct thread_info *current_thread_info(void) 75{ 76 struct thread_info *ti; 77#ifdef CONFIG_CPU_HAS_SR_RB 78 __asm__("stc r7_bank, %0" : "=r" (ti)); 79#else 80 unsigned long __dummy; 81 82 __asm__ __volatile__ ( 83 "mov r15, %0\n\t" 84 "and %1, %0\n\t" 85 : "=&r" (ti), "=r" (__dummy) 86 : "1" (~(THREAD_SIZE - 1)) 87 : "memory"); 88#endif 89 90 return ti; 91} 92 93/* thread information allocation */ 94#ifdef CONFIG_DEBUG_STACK_USAGE 95#define alloc_thread_info(ti) kzalloc(THREAD_SIZE, GFP_KERNEL) 96#else 97#define alloc_thread_info(ti) kmalloc(THREAD_SIZE, GFP_KERNEL) 98#endif 99#define free_thread_info(ti) kfree(ti) 100 101#endif /* __ASSEMBLY__ */ 102 103/* 104 * thread information flags 105 * - these are process state flags that various assembly files may need to access 106 * - pending work-to-be-done flags are in LSW 107 * - other flags in MSW 108 */ 109#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 110#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 111#define TIF_SIGPENDING 2 /* signal pending */ 112#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 113#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ 114#define TIF_SINGLESTEP 5 /* singlestepping active */ 115#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 116#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 117#define TIF_MEMDIE 18 118#define TIF_FREEZE 19 119 120#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 121#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 122#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 123#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 124#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 125#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 126#define _TIF_USEDFPU (1<<TIF_USEDFPU) 127#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 128#define _TIF_FREEZE (1<<TIF_FREEZE) 129 130#define _TIF_WORK_MASK 0x000000FE /* work to do on interrupt/exception return */ 131#define _TIF_ALLWORK_MASK 0x000000FF /* work to do on any return to u-space */ 132 133#endif /* __KERNEL__ */ 134 135#endif /* __ASM_SH_THREAD_INFO_H */ 136