5323180db7
The commit 4d40bff7110e9e1a97ff8c01bdd6350e9867cc10 ("Allow CpU
exception in kernel partially") was broken. The commit was to fix
theoretical problem but broke usual case. Revert it for now.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
142 lines
4.2 KiB
C
142 lines
4.2 KiB
C
/* thread_info.h: MIPS 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__
|
|
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <asm/processor.h>
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
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 tp_value; /* thread pointer */
|
|
__u32 cpu; /* current CPU */
|
|
int preempt_count; /* 0 => preemptable, <0 => BUG */
|
|
|
|
mm_segment_t addr_limit; /* thread address space:
|
|
0-0xBFFFFFFF for user-thead
|
|
0-0xFFFFFFFF for kernel-thread
|
|
*/
|
|
struct restart_block restart_block;
|
|
struct pt_regs *regs;
|
|
};
|
|
|
|
/*
|
|
* macros/functions for gaining access to the thread information structure
|
|
*
|
|
* preempt_count needs to be 1 initially, until the scheduler is functional.
|
|
*/
|
|
#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 thread information struct from C. */
|
|
register struct thread_info *__current_thread_info __asm__("$28");
|
|
#define current_thread_info() __current_thread_info
|
|
|
|
/* thread information allocation */
|
|
#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
|
|
#define THREAD_SIZE_ORDER (1)
|
|
#endif
|
|
#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
|
|
#define THREAD_SIZE_ORDER (2)
|
|
#endif
|
|
#ifdef CONFIG_PAGE_SIZE_8KB
|
|
#define THREAD_SIZE_ORDER (1)
|
|
#endif
|
|
#ifdef CONFIG_PAGE_SIZE_16KB
|
|
#define THREAD_SIZE_ORDER (0)
|
|
#endif
|
|
#ifdef CONFIG_PAGE_SIZE_64KB
|
|
#define THREAD_SIZE_ORDER (0)
|
|
#endif
|
|
|
|
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
|
|
#define THREAD_MASK (THREAD_SIZE - 1UL)
|
|
|
|
#ifdef CONFIG_DEBUG_STACK_USAGE
|
|
#define alloc_thread_info(tsk) \
|
|
({ \
|
|
struct thread_info *ret; \
|
|
\
|
|
ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
|
|
if (ret) \
|
|
memset(ret, 0, THREAD_SIZE); \
|
|
ret; \
|
|
})
|
|
#else
|
|
#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
|
|
#endif
|
|
|
|
#define free_thread_info(info) kfree(info)
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#define PREEMPT_ACTIVE 0x10000000
|
|
|
|
/*
|
|
* 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_NOTIFY_RESUME 1 /* resumption notification requested */
|
|
#define TIF_SIGPENDING 2 /* signal pending */
|
|
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
|
|
#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
|
|
#define TIF_SECCOMP 5 /* secure computing */
|
|
#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
|
|
#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
|
|
#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
|
|
#define TIF_MEMDIE 18
|
|
#define TIF_FREEZE 19
|
|
#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
|
|
|
|
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
|
|
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
|
|
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
|
|
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
|
|
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
|
|
#define _TIF_SECCOMP (1<<TIF_SECCOMP)
|
|
#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
|
|
#define _TIF_USEDFPU (1<<TIF_USEDFPU)
|
|
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
|
|
#define _TIF_FREEZE (1<<TIF_FREEZE)
|
|
|
|
/* work to do on interrupt/exception return */
|
|
#define _TIF_WORK_MASK (0x0000ffef & ~_TIF_SECCOMP)
|
|
/* work to do on any return to u-space */
|
|
#define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_THREAD_INFO_H */
|