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138 lines
4.1 KiB
C
138 lines
4.1 KiB
C
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/* thread_info.h: MIPS low-level thread information
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*
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* Copyright (C) 2002 David Howells (dhowells@redhat.com)
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* - Incorporating suggestions made by Linus Torvalds and Dave Miller
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*/
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#ifndef _ASM_THREAD_INFO_H
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#define _ASM_THREAD_INFO_H
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#ifdef __KERNEL__
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#include <linux/config.h>
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#ifndef __ASSEMBLY__
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#include <asm/processor.h>
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/*
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* low level task data that entry.S needs immediate access to
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* - this struct should fit entirely inside of one cache line
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* - this struct shares the supervisor stack pages
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* - if the contents of this structure are changed, the assembly constants
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* must also be changed
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*/
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struct thread_info {
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struct task_struct *task; /* main task structure */
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struct exec_domain *exec_domain; /* execution domain */
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unsigned long flags; /* low level flags */
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__u32 cpu; /* current CPU */
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__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
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mm_segment_t addr_limit; /* thread address space:
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0-0xBFFFFFFF for user-thead
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0-0xFFFFFFFF for kernel-thread
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*/
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struct restart_block restart_block;
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};
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/*
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* macros/functions for gaining access to the thread information structure
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*
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* preempt_count needs to be 1 initially, until the scheduler is functional.
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*/
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.exec_domain = &default_exec_domain, \
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.flags = 0, \
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.cpu = 0, \
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.preempt_count = 1, \
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.addr_limit = KERNEL_DS, \
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.restart_block = { \
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.fn = do_no_restart_syscall, \
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}, \
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}
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#define init_thread_info (init_thread_union.thread_info)
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#define init_stack (init_thread_union.stack)
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/* How to get the thread information struct from C. */
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register struct thread_info *__current_thread_info __asm__("$28");
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#define current_thread_info() __current_thread_info
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/* thread information allocation */
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#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_MIPS32)
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#define THREAD_SIZE_ORDER (1)
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#endif
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#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_MIPS64)
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#define THREAD_SIZE_ORDER (2)
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#endif
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#ifdef CONFIG_PAGE_SIZE_8KB
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#define THREAD_SIZE_ORDER (1)
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#endif
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#ifdef CONFIG_PAGE_SIZE_16KB
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#define THREAD_SIZE_ORDER (0)
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#endif
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#ifdef CONFIG_PAGE_SIZE_64KB
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#define THREAD_SIZE_ORDER (0)
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#endif
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#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
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#define THREAD_MASK (THREAD_SIZE - 1UL)
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#ifdef CONFIG_DEBUG_STACK_USAGE
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#define alloc_thread_info(tsk) \
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({ \
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struct thread_info *ret; \
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\
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ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
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if (ret) \
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memset(ret, 0, THREAD_SIZE); \
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ret; \
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})
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#else
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#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
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#endif
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#define free_thread_info(info) kfree(info)
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#define get_thread_info(ti) get_task_struct((ti)->task)
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#define put_thread_info(ti) put_task_struct((ti)->task)
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#endif /* !__ASSEMBLY__ */
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#define PREEMPT_ACTIVE 0x10000000
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/*
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* thread information flags
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* - these are process state flags that various assembly files may need to
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* access
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* - pending work-to-be-done flags are in LSW
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* - other flags in MSW
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*/
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#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
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#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
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#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
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#define TIF_MEMDIE 18
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#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
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#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
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#define _TIF_USEDFPU (1<<TIF_USEDFPU)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#define _TIF_WORK_MASK 0x0000ffef /* work to do on
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interrupt/exception return */
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#define _TIF_ALLWORK_MASK 0x8000ffff /* work to do on any return to
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u-space */
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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