/* SPDX-License-Identifier: GPL-2.0-only */
|
/*
|
* Thread support for the Hexagon architecture
|
*
|
* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
|
*/
|
|
#ifndef _ASM_THREAD_INFO_H
|
#define _ASM_THREAD_INFO_H
|
|
#ifdef __KERNEL__
|
|
#ifndef __ASSEMBLY__
|
#include <asm/processor.h>
|
#include <asm/registers.h>
|
#include <asm/page.h>
|
#endif
|
|
#define THREAD_SHIFT 12
|
#define THREAD_SIZE (1<<THREAD_SHIFT)
|
#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
|
|
#ifndef __ASSEMBLY__
|
|
typedef struct {
|
unsigned long seg;
|
} mm_segment_t;
|
|
/*
|
* This is union'd with the "bottom" of the kernel stack.
|
* It keeps track of thread info which is handy for routines
|
* to access quickly.
|
*/
|
|
struct thread_info {
|
struct task_struct *task; /* main task structure */
|
unsigned long flags; /* low level flags */
|
__u32 cpu; /* current cpu */
|
int preempt_count; /* 0=>preemptible,<0=>BUG */
|
mm_segment_t addr_limit; /* segmentation sux */
|
/*
|
* used for syscalls somehow;
|
* seems to have a function pointer and four arguments
|
*/
|
/* Points to the current pt_regs frame */
|
struct pt_regs *regs;
|
/*
|
* saved kernel sp at switch_to time;
|
* not sure if this is used (it's not in the VM model it seems;
|
* see thread_struct)
|
*/
|
unsigned long sp;
|
};
|
|
#else /* !__ASSEMBLY__ */
|
|
#include <asm/asm-offsets.h>
|
|
#endif /* __ASSEMBLY__ */
|
|
#ifndef __ASSEMBLY__
|
|
#define INIT_THREAD_INFO(tsk) \
|
{ \
|
.task = &tsk, \
|
.flags = 0, \
|
.cpu = 0, \
|
.preempt_count = 1, \
|
.addr_limit = KERNEL_DS, \
|
.sp = 0, \
|
.regs = NULL, \
|
}
|
|
/* Tacky preprocessor trickery */
|
#define qqstr(s) qstr(s)
|
#define qstr(s) #s
|
#define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
|
|
register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
|
#define current_thread_info() __current_thread_info
|
|
#endif /* __ASSEMBLY__ */
|
|
/*
|
* 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_NOTIFY_RESUME 1 /* resumption notification requested */
|
#define TIF_SIGPENDING 2 /* signal pending */
|
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
|
#define TIF_SINGLESTEP 4 /* restore ss @ return to usr mode */
|
#define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */
|
#define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */
|
/* true if poll_idle() is polling TIF_NEED_RESCHED */
|
#define TIF_MEMDIE 17 /* OOM killer killed process */
|
|
#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_SINGLESTEP (1 << TIF_SINGLESTEP)
|
#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
|
|
/* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
|
#define _TIF_WORK_MASK (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
|
|
/* work to do on any return to u-space */
|
#define _TIF_ALLWORK_MASK 0x0000FFFF
|
|
#endif /* __KERNEL__ */
|
|
#endif
|
