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/* 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__
/*
* 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 */
/*
* 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, \
.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
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