mirror of
https://github.com/RT-Thread/rt-thread.git
synced 2025-02-01 15:30:25 +08:00
5796e0d646
This patch improves the atomicity of context switching by ensuring that the stack pointer (sp) and thread self updates occur simultaneously. This enhancement is crucial for maintaining thread safety and preventing potential inconsistencies during context switches. Changes: - Modified `cpuport.h` to use `ARM64_THREAD_REG` for thread self access. - Added an `update_tidr` macro in `context_gcc.S` to streamline thread ID updates. - Adjusted `rt_hw_context_switch_to` and `rt_hw_context_switch` to call `update_tidr`, ensuring atomic updates during context switches. - Cleaned up `scheduler_mp.c` by removing redundant thread self assignments. Signed-off-by: Shell <smokewood@qq.com>
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/*
|
|
* Copyright (c) 2006-2021, RT-Thread Development Team
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2023-10-25 Shell Move ffs to cpuport, add general implementation
|
|
* by inline assembly
|
|
* 2024-01-18 Shell support rt_hw_thread_self to improve overall performance
|
|
*/
|
|
|
|
#ifndef CPUPORT_H__
|
|
#define CPUPORT_H__
|
|
|
|
#include <armv8.h>
|
|
#include <rtcompiler.h>
|
|
#include <rttypes.h>
|
|
|
|
#ifdef RT_USING_SMP
|
|
|
|
/**
|
|
* Spinlock
|
|
*/
|
|
|
|
typedef struct
|
|
{
|
|
rt_uint32_t value;
|
|
} rt_hw_spinlock_t;
|
|
|
|
#endif /* RT_USING_SMP */
|
|
|
|
#define rt_hw_barrier(cmd, ...) \
|
|
__asm__ volatile (RT_STRINGIFY(cmd) " "RT_STRINGIFY(__VA_ARGS__):::"memory")
|
|
|
|
#define rt_hw_isb() rt_hw_barrier(isb)
|
|
#define rt_hw_dmb() rt_hw_barrier(dmb, ish)
|
|
#define rt_hw_wmb() rt_hw_barrier(dmb, ishst)
|
|
#define rt_hw_rmb() rt_hw_barrier(dmb, ishld)
|
|
#define rt_hw_dsb() rt_hw_barrier(dsb, ish)
|
|
|
|
#define rt_hw_wfi() rt_hw_barrier(wfi)
|
|
#define rt_hw_wfe() rt_hw_barrier(wfe)
|
|
#define rt_hw_sev() rt_hw_barrier(sev)
|
|
|
|
#define rt_hw_cpu_relax() rt_hw_barrier(yield)
|
|
|
|
#define rt_hw_sysreg_write(sysreg, val) \
|
|
__asm__ volatile ("msr "RT_STRINGIFY(sysreg)", %0"::"r"((rt_uint64_t)(val)))
|
|
|
|
#define rt_hw_sysreg_read(sysreg, val) \
|
|
__asm__ volatile ("mrs %0, "RT_STRINGIFY(sysreg)"":"=r"((val)))
|
|
|
|
void _thread_start(void);
|
|
|
|
#ifdef ARCH_USING_HW_THREAD_SELF
|
|
rt_inline struct rt_thread *rt_hw_thread_self(void)
|
|
{
|
|
struct rt_thread *thread;
|
|
__asm__ volatile ("mrs %0, " RT_STRINGIFY(ARM64_THREAD_REG) :"=r"(thread));
|
|
|
|
return thread;
|
|
}
|
|
|
|
rt_inline void rt_hw_thread_set_self(struct rt_thread *thread)
|
|
{
|
|
__asm__ volatile ("msr " RT_STRINGIFY(ARM64_THREAD_REG) ", %0"::"r"(thread));
|
|
}
|
|
|
|
#endif /* ARCH_USING_HW_THREAD_SELF */
|
|
|
|
#endif /*CPUPORT_H__*/
|