79 lines
2.0 KiB
C
79 lines
2.0 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
|
|
*/
|
|
|
|
#ifndef CPUPORT_H__
|
|
#define CPUPORT_H__
|
|
|
|
#include <armv8.h>
|
|
#include <rtcompiler.h>
|
|
#include <rtdef.h>
|
|
|
|
#ifdef RT_USING_SMP
|
|
typedef struct {
|
|
volatile unsigned int lock;
|
|
} rt_hw_spinlock_t;
|
|
#endif
|
|
|
|
#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 RT_USING_CPU_FFS
|
|
/**
|
|
* This function finds the first bit set (beginning with the least significant bit)
|
|
* in value and return the index of that bit.
|
|
*
|
|
* Bits are numbered starting at 1 (the least significant bit). A return value of
|
|
* zero from any of these functions means that the argument was zero.
|
|
*
|
|
* @return return the index of the first bit set. If value is 0, then this function
|
|
* shall return 0.
|
|
*/
|
|
rt_inline int __rt_ffs(int value)
|
|
{
|
|
#ifdef __GNUC__
|
|
return __builtin_ffs(value);
|
|
#else
|
|
__asm__ volatile (
|
|
"rbit w1, %w0\n"
|
|
"cmp %w0, 0\n"
|
|
"clz w1, w1\n"
|
|
"csinc %w0, wzr, w1, eq\n"
|
|
: "=r"(value)
|
|
: "0"(value)
|
|
);
|
|
return value;
|
|
#endif
|
|
}
|
|
|
|
#endif /* RT_USING_CPU_FFS */
|
|
|
|
#endif /*CPUPORT_H__*/
|