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/* SPDX-License-Identifier: GPL-2.0 */
/*
* thread_info.h: LoongArch low-level thread information
*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#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 */
unsigned long flags; /* low level flags */
unsigned long tp_value; /* thread pointer */
__u32 cpu; /* current CPU */
int preempt_count; /* 0 => preemptible, <0 => BUG */
struct pt_regs *regs;
unsigned long syscall; /* syscall number */
unsigned long syscall_work; /* SYSCALL_WORK_ flags */
};
/*
* macros/functions for gaining access to the thread information structure
*/
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
.flags = _TIF_FIXADE, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
}
/* How to get the thread information struct from C. */
register struct thread_info *__current_thread_info __asm__("$tp");
static inline struct thread_info *current_thread_info(void)
{
return __current_thread_info;
}
register unsigned long current_stack_pointer __asm__("$sp");
#endif /* !__ASSEMBLY__ */
/* thread information allocation */
#define THREAD_SIZE SZ_16K
#define THREAD_MASK (THREAD_SIZE - 1UL)
#define THREAD_SIZE_ORDER ilog2(THREAD_SIZE / PAGE_SIZE)
/*
* 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_SIGPENDING 1 /* signal pending */
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
#define TIF_NOTIFY_RESUME 3 /* callback before returning to user */
#define TIF_NOTIFY_SIGNAL 4 /* signal notifications exist */
#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
#define TIF_NOHZ 6 /* in adaptive nohz mode */
#define TIF_UPROBE 7 /* breakpointed or singlestepping */
#define TIF_USEDFPU 8 /* FPU was used by this task this quantum (SMP) */
#define TIF_USEDSIMD 9 /* SIMD has been used this quantum */
#define TIF_MEMDIE 10 /* is terminating due to OOM killer */
#define TIF_FIXADE 11 /* Fix address errors in software */
#define TIF_LOGADE 12 /* Log address errors to syslog */
#define TIF_32BIT_REGS 13 /* 32-bit general purpose registers */
#define TIF_32BIT_ADDR 14 /* 32-bit address space */
#define TIF_LOAD_WATCH 15 /* If set, load watch registers */
#define TIF_SINGLESTEP 16 /* Single Step */
#define TIF_LSX_CTX_LIVE 17 /* LSX context must be preserved */
#define TIF_LASX_CTX_LIVE 18 /* LASX context must be preserved */
#define TIF_USEDLBT 19 /* LBT was used by this task this quantum (SMP) */
#define TIF_LBT_CTX_LIVE 20 /* LBT context must be preserved */
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
#define _TIF_NOHZ (1<<TIF_NOHZ)
#define _TIF_UPROBE (1<<TIF_UPROBE)
#define _TIF_USEDFPU (1<<TIF_USEDFPU)
#define _TIF_USEDSIMD (1<<TIF_USEDSIMD)
#define _TIF_FIXADE (1<<TIF_FIXADE)
#define _TIF_LOGADE (1<<TIF_LOGADE)
#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
#define _TIF_LSX_CTX_LIVE (1<<TIF_LSX_CTX_LIVE)
#define _TIF_LASX_CTX_LIVE (1<<TIF_LASX_CTX_LIVE)
#define _TIF_USEDLBT (1<<TIF_USEDLBT)
#define _TIF_LBT_CTX_LIVE (1<<TIF_LBT_CTX_LIVE)
#endif /* __KERNEL__ */
#endif /* _ASM_THREAD_INFO_H */
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