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108 lines
2.9 KiB
C
108 lines
2.9 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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static __always_inline void apic_timer_set_div(uint64_t divider)
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{
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if (CURRENT_APIC_STATE == APIC_X2APIC_ENABLED)
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wrmsr(0x83e, divider);
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else
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*(uint32_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_CLKDIV) = (uint32_t)divider;
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}
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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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static __always_inline void apic_timer_set_init_cnt(uint32_t init_cnt)
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{
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if (CURRENT_APIC_STATE == APIC_X2APIC_ENABLED)
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wrmsr(0x838, init_cnt);
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else
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*(uint32_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_INITIAL_COUNT_REG) = (uint32_t)init_cnt;
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}
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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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static __always_inline void apic_timer_set_LVT(uint32_t vector, uint32_t mask, uint32_t mode)
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{
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register uint32_t val = (mode << 17) | vector | (mask ? (APIC_LVT_INT_MASKED) : 0);
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if (CURRENT_APIC_STATE == APIC_X2APIC_ENABLED)
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wrmsr(0x832, val);
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else
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*(uint32_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_TIMER) = (uint32_t)val;
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}
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static __always_inline void apic_timer_write_LVT(uint32_t value)
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{
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if (CURRENT_APIC_STATE == APIC_X2APIC_ENABLED)
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wrmsr(0x832, value);
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else
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*(uint32_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_TIMER) = (uint32_t)value;
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}
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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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static __always_inline uint32_t apic_timer_get_LVT()
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{
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if (CURRENT_APIC_STATE == APIC_X2APIC_ENABLED)
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return rdmsr(0x832);
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else
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return *(uint32_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_TIMER);
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}
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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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static __always_inline uint32_t apic_timer_get_current()
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{
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if (CURRENT_APIC_STATE == APIC_X2APIC_ENABLED)
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return (uint32_t)rdmsr(0x839);
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else
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return *(uint32_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_CURRENT_COUNT_REG);
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}
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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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uint32_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 |