199 lines
6.2 KiB
C
199 lines
6.2 KiB
C
/* thread_info.h: i386 low-level thread information
|
|
*
|
|
* Copyright (C) 2002 David Howells (dhowells@redhat.com)
|
|
* - Incorporating suggestions made by Linus Torvalds and Dave Miller
|
|
*/
|
|
|
|
#ifndef _ASM_THREAD_INFO_H
|
|
#define _ASM_THREAD_INFO_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/compiler.h>
|
|
#include <asm/page.h>
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <asm/processor.h>
|
|
#endif
|
|
|
|
/*
|
|
* low level task data that entry.S needs immediate access to
|
|
* - this struct should fit entirely inside of one cache line
|
|
* - this struct shares the supervisor stack pages
|
|
* - if the contents of this structure are changed,
|
|
* the assembly constants must also be changed
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
|
|
struct thread_info {
|
|
struct task_struct *task; /* main task structure */
|
|
struct exec_domain *exec_domain; /* execution domain */
|
|
unsigned long flags; /* low level flags */
|
|
unsigned long status; /* thread-synchronous flags */
|
|
__u32 cpu; /* current CPU */
|
|
int preempt_count; /* 0 => preemptable,
|
|
<0 => BUG */
|
|
mm_segment_t addr_limit; /* thread address space:
|
|
0-0xBFFFFFFF user-thread
|
|
0-0xFFFFFFFF kernel-thread
|
|
*/
|
|
void *sysenter_return;
|
|
struct restart_block restart_block;
|
|
unsigned long previous_esp; /* ESP of the previous stack in
|
|
case of nested (IRQ) stacks
|
|
*/
|
|
__u8 supervisor_stack[0];
|
|
};
|
|
|
|
#else /* !__ASSEMBLY__ */
|
|
|
|
#include <asm/asm-offsets.h>
|
|
|
|
#endif
|
|
|
|
#define PREEMPT_ACTIVE 0x10000000
|
|
#ifdef CONFIG_4KSTACKS
|
|
#define THREAD_SIZE (4096)
|
|
#else
|
|
#define THREAD_SIZE (8192)
|
|
#endif
|
|
|
|
#define STACK_WARN (THREAD_SIZE/8)
|
|
/*
|
|
* macros/functions for gaining access to the thread information structure
|
|
*
|
|
* preempt_count needs to be 1 initially, until the scheduler is functional.
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#define INIT_THREAD_INFO(tsk) \
|
|
{ \
|
|
.task = &tsk, \
|
|
.exec_domain = &default_exec_domain, \
|
|
.flags = 0, \
|
|
.cpu = 0, \
|
|
.preempt_count = 1, \
|
|
.addr_limit = KERNEL_DS, \
|
|
.restart_block = { \
|
|
.fn = do_no_restart_syscall, \
|
|
}, \
|
|
}
|
|
|
|
#define init_thread_info (init_thread_union.thread_info)
|
|
#define init_stack (init_thread_union.stack)
|
|
|
|
|
|
/* how to get the current stack pointer from C */
|
|
register unsigned long current_stack_pointer asm("esp") __used;
|
|
|
|
/* how to get the thread information struct from C */
|
|
static inline struct thread_info *current_thread_info(void)
|
|
{
|
|
return (struct thread_info *)
|
|
(current_stack_pointer & ~(THREAD_SIZE - 1));
|
|
}
|
|
|
|
/* thread information allocation */
|
|
#ifdef CONFIG_DEBUG_STACK_USAGE
|
|
#define alloc_thread_info(tsk) ((struct thread_info *) \
|
|
__get_free_pages(GFP_KERNEL | __GFP_ZERO, get_order(THREAD_SIZE)))
|
|
#else
|
|
#define alloc_thread_info(tsk) ((struct thread_info *) \
|
|
__get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE)))
|
|
#endif
|
|
|
|
#define free_thread_info(info) free_pages((unsigned long)(info), get_order(THREAD_SIZE))
|
|
|
|
#else /* !__ASSEMBLY__ */
|
|
|
|
/* how to get the thread information struct from ASM */
|
|
#define GET_THREAD_INFO(reg) \
|
|
movl $-THREAD_SIZE, reg; \
|
|
andl %esp, reg
|
|
|
|
/* use this one if reg already contains %esp */
|
|
#define GET_THREAD_INFO_WITH_ESP(reg) \
|
|
andl $-THREAD_SIZE, reg
|
|
|
|
#endif
|
|
|
|
/*
|
|
* thread information flags
|
|
* - these are process state flags that various
|
|
* assembly files may need to access
|
|
* - pending work-to-be-done flags are in LSW
|
|
* - other flags in MSW
|
|
*/
|
|
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
|
|
#define TIF_SIGPENDING 1 /* signal pending */
|
|
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
|
|
#define TIF_SINGLESTEP 3 /* restore singlestep on return to
|
|
user mode */
|
|
#define TIF_IRET 4 /* return with iret */
|
|
#define TIF_SYSCALL_EMU 5 /* syscall emulation active */
|
|
#define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */
|
|
#define TIF_SECCOMP 7 /* secure computing */
|
|
#define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal() */
|
|
#define TIF_HRTICK_RESCHED 9 /* reprogram hrtick timer */
|
|
#define TIF_MEMDIE 16
|
|
#define TIF_DEBUG 17 /* uses debug registers */
|
|
#define TIF_IO_BITMAP 18 /* uses I/O bitmap */
|
|
#define TIF_FREEZE 19 /* is freezing for suspend */
|
|
#define TIF_NOTSC 20 /* TSC is not accessible in userland */
|
|
#define TIF_FORCED_TF 21 /* true if TF in eflags artificially */
|
|
#define TIF_DEBUGCTLMSR 22 /* uses thread_struct.debugctlmsr */
|
|
#define TIF_DS_AREA_MSR 23 /* uses thread_struct.ds_area_msr */
|
|
#define TIF_BTS_TRACE_TS 24 /* record scheduling event timestamps */
|
|
|
|
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
|
|
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
|
|
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
|
|
#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
|
|
#define _TIF_IRET (1 << TIF_IRET)
|
|
#define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
|
|
#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
|
|
#define _TIF_SECCOMP (1 << TIF_SECCOMP)
|
|
#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
|
|
#define _TIF_HRTICK_RESCHED (1 << TIF_HRTICK_RESCHED)
|
|
#define _TIF_DEBUG (1 << TIF_DEBUG)
|
|
#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP)
|
|
#define _TIF_FREEZE (1 << TIF_FREEZE)
|
|
#define _TIF_NOTSC (1 << TIF_NOTSC)
|
|
#define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
|
|
#define _TIF_DEBUGCTLMSR (1 << TIF_DEBUGCTLMSR)
|
|
#define _TIF_DS_AREA_MSR (1 << TIF_DS_AREA_MSR)
|
|
#define _TIF_BTS_TRACE_TS (1 << TIF_BTS_TRACE_TS)
|
|
|
|
/* work to do on interrupt/exception return */
|
|
#define _TIF_WORK_MASK \
|
|
(0x0000FFFF & ~(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
|
|
_TIF_SECCOMP | _TIF_SYSCALL_EMU))
|
|
/* work to do on any return to u-space */
|
|
#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
|
|
|
|
/* flags to check in __switch_to() */
|
|
#define _TIF_WORK_CTXSW \
|
|
(_TIF_IO_BITMAP | _TIF_NOTSC | _TIF_DEBUGCTLMSR | \
|
|
_TIF_DS_AREA_MSR | _TIF_BTS_TRACE_TS)
|
|
#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
|
|
#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW | _TIF_DEBUG)
|
|
|
|
|
|
/*
|
|
* Thread-synchronous status.
|
|
*
|
|
* This is different from the flags in that nobody else
|
|
* ever touches our thread-synchronous status, so we don't
|
|
* have to worry about atomic accesses.
|
|
*/
|
|
#define TS_USEDFPU 0x0001 /* FPU was used by this task
|
|
this quantum (SMP) */
|
|
#define TS_POLLING 0x0002 /* True if in idle loop
|
|
and not sleeping */
|
|
|
|
#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_THREAD_INFO_H */
|