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85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
#pragma once
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#include <common/unistd.h>
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#include "apic.h"
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extern uint64_t apic_timer_ticks_result;
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// 5ms产生一次中断
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#define APIC_TIMER_INTERVAL 5
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#define APIC_TIMER_DIVISOR 3
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#define APIC_TIMER_IRQ_NUM 151
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#pragma GCC push_options
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#pragma GCC optimize("O0")
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/**
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* @brief 设置apic定时器的分频计数
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*
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* @param divider 分频除数
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*/
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#define apic_timer_set_div(divider) \
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do \
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{ \
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wrmsr(0x83e, divider); \
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} while (0)
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/**
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* @brief 设置apic定时器的初始计数值
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*
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* @param init_cnt 初始计数值
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*/
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#define apic_timer_set_init_cnt(init_cnt) \
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do \
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{ \
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wrmsr(0x838, init_cnt); \
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} while (0)
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/**
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* @brief 设置apic定时器的lvt,并启动定时器
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*
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* @param vector 中断向量号
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* @param mask 是否屏蔽(1:屏蔽, 0:不屏蔽)
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* @param mode 计时模式
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*/
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#define apic_timer_set_LVT(vector, mask, mode) \
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do \
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{ \
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wrmsr(0x832, (mode << 17) | vector | (mask ? (APIC_LVT_INT_MASKED) : 0)); \
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} while (0)
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#define apic_timer_write_LVT(value) \
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do \
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{ \
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wrmsr(0x832, value); \
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} while (0)
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/**
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* @brief 获取apic定时器的LVT的值
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*
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*/
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#define apic_timer_get_LVT() (rdmsr(0x832))
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/**
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* @brief 获取apic定时器当前计数值
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*
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*/
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#define apic_timer_get_current() (rdmsr(0x839))
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/**
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* @brief 停止apic定时器
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*
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*/
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#define apic_timer_stop() \
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do \
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{ \
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uint64_t val = apic_timer_get_LVT(); \
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val |= APIC_LVT_INT_MASKED; \
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apic_timer_write_LVT(val); \
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} while (0)
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/**
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* @brief 初始化local APIC定时器
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*
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*/
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void apic_timer_init();
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#pragma GCC pop_options |