400 Star 2.4K Fork 569

WeHarmony/kernel_liteos_a_note

加入 Gitee
与超过 1200万 开发者一起发现、参与优秀开源项目,私有仓库也完全免费 :)
免费加入
文件
克隆/下载
arm_generic_timer.c 6.12 KB
一键复制 编辑 原始数据 按行查看 历史
/*
* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "los_hw_pri.h"
#include "los_tick_pri.h"
#include "los_sys_pri.h"
#include "gic_common.h"
#define STRING_COMB(x, y, z) x ## y ## z
#ifdef LOSCFG_ARCH_SECURE_MONITOR_MODE
#define TIMER_REG(reg) STRING_COMB(TIMER_REG_, CNTPS, reg)
#else
#define TIMER_REG(reg) STRING_COMB(TIMER_REG_, CNTP, reg)
#endif
#define TIMER_REG_CTL TIMER_REG(_CTL) /* 32 bits */
#define TIMER_REG_TVAL TIMER_REG(_TVAL) /* 32 bits */
#define TIMER_REG_CVAL TIMER_REG(_CVAL) /* 64 bits */
#define TIMER_REG_CT TIMER_REG(CT) /* 64 bits */
#ifdef __LP64__
#define TIMER_REG_CNTFRQ cntfrq_el0
/* CNTP AArch64 registers */
#define TIMER_REG_CNTP_CTL cntp_ctl_el0
#define TIMER_REG_CNTP_TVAL cntp_tval_el0
#define TIMER_REG_CNTP_CVAL cntp_cval_el0
#define TIMER_REG_CNTPCT cntpct_el0
/* CNTPS AArch64 registers */
#define TIMER_REG_CNTPS_CTL cntps_ctl_el1
#define TIMER_REG_CNTPS_TVAL cntps_tval_el1
#define TIMER_REG_CNTPS_CVAL cntps_cval_el1
#define TIMER_REG_CNTPSCT cntpct_el0
#define READ_TIMER_REG32(reg) AARCH64_SYSREG_READ(reg)
#define READ_TIMER_REG64(reg) AARCH64_SYSREG_READ(reg)
#define WRITE_TIMER_REG32(reg, val) AARCH64_SYSREG_WRITE(reg, (UINT64)(val))
#define WRITE_TIMER_REG64(reg, val) AARCH64_SYSREG_WRITE(reg, val)
#else /* Aarch32 */
#define TIMER_REG_CNTFRQ CP15_REG(c14, 0, c0, 0)
/* CNTP AArch32 registers */
#define TIMER_REG_CNTP_CTL CP15_REG(c14, 0, c2, 1)
#define TIMER_REG_CNTP_TVAL CP15_REG(c14, 0, c2, 0)
#define TIMER_REG_CNTP_CVAL CP15_REG64(c14, 2)
#define TIMER_REG_CNTPCT CP15_REG64(c14, 0)
/* CNTPS AArch32 registers are banked and accessed though CNTP */
#define CNTPS CNTP
#define READ_TIMER_REG32(reg) ARM_SYSREG_READ(reg)
#define READ_TIMER_REG64(reg) ARM_SYSREG64_READ(reg)
#define WRITE_TIMER_REG32(reg, val) ARM_SYSREG_WRITE(reg, val)
#define WRITE_TIMER_REG64(reg, val) ARM_SYSREG64_WRITE(reg, val)
#endif
/*
* 见于 << arm 架构参考手册>> B4.1.21 处 CNTFRQ寄存器表示系统计数器的时钟频率。
* 这个寄存器是一个通用的计时器寄存器。
* MRC p15, 0, <Rt>, c14, c0, 0 ; Read CNTFRQ into Rt
* MCR p15, 0, <Rt>, c14, c0, 0 ; Write Rt to CNTFRQ
*/
UINT32 HalClockFreqRead(VOID)
{
return READ_TIMER_REG32(TIMER_REG_CNTFRQ);
}
VOID HalClockFreqWrite(UINT32 freq)
{
WRITE_TIMER_REG32(TIMER_REG_CNTFRQ, freq);
}
STATIC_INLINE VOID TimerCtlWrite(UINT32 cntpCtl)
{
WRITE_TIMER_REG32(TIMER_REG_CTL, cntpCtl);
}
STATIC_INLINE UINT64 TimerCvalRead(VOID)
{
return READ_TIMER_REG64(TIMER_REG_CVAL);
}
STATIC_INLINE VOID TimerCvalWrite(UINT64 cval)
{
WRITE_TIMER_REG64(TIMER_REG_CVAL, cval);
}
STATIC_INLINE VOID TimerTvalWrite(UINT32 tval)
{
WRITE_TIMER_REG32(TIMER_REG_TVAL, tval);
}
UINT64 HalClockGetCycles(VOID)
{
UINT64 cntpct;
cntpct = READ_TIMER_REG64(TIMER_REG_CT);
return cntpct;
}
//硬时钟初始化
LITE_OS_SEC_TEXT_INIT VOID HalClockInit(VOID)
{
UINT32 ret;
g_sysClock = HalClockFreqRead();//读取CPU的时钟频率
ret = LOS_HwiCreate(OS_TICK_INT_NUM, MIN_INTERRUPT_PRIORITY, 0, OsTickHandler, 0);//创建硬中断定时器
if (ret != LOS_OK) {
PRINT_ERR("%s, %d create tick irq failed, ret:0x%x\n", __FUNCTION__, __LINE__, ret);
}
}
LITE_OS_SEC_TEXT_INIT VOID HalClockStart(VOID)
{
HalIrqUnmask(OS_TICK_INT_NUM);
/* triggle the first tick */
TimerCtlWrite(0);
TimerTvalWrite(OS_CYCLE_PER_TICK);
TimerCtlWrite(1);
}
VOID HalDelayUs(UINT32 usecs)
{
UINT64 cycles = (UINT64)usecs * g_sysClock / OS_SYS_US_PER_SECOND;
UINT64 deadline = HalClockGetCycles() + cycles;
while (HalClockGetCycles() < deadline) {
__asm__ volatile ("nop");
}
}
DEPRECATED UINT64 hi_sched_clock(VOID)
{
return LOS_CurrNanosec();
}
UINT32 HalClockGetTickTimerCycles(VOID)
{
UINT64 cval = TimerCvalRead();
UINT64 cycles = HalClockGetCycles();
return (UINT32)((cval > cycles) ? (cval - cycles) : 0);
}
UINT64 HalClockTickTimerReload(UINT64 cycles)
{
HalIrqMask(OS_TICK_INT_NUM);
HalIrqClear(OS_TICK_INT_NUM);
TimerCtlWrite(0);
TimerCvalWrite(HalClockGetCycles() + cycles);
TimerCtlWrite(1);
HalIrqUnmask(OS_TICK_INT_NUM);
return cycles;
}
Loading...
马建仓 AI 助手
尝试更多
代码解读
代码找茬
代码优化
C
1
https://gitee.com/weharmony/kernel_liteos_a_note.git
git@gitee.com:weharmony/kernel_liteos_a_note.git
weharmony
kernel_liteos_a_note
kernel_liteos_a_note
master

搜索帮助