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116 lines
4.0 KiB
C
116 lines
4.0 KiB
C
#include "acpi.h"
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#include "../../common/printk.h"
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#include "../../common/kprint.h"
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#include "../multiboot2/multiboot2.h"
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#include "../../mm/mm.h"
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// 获取RSDT entry的虚拟地址
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#define acpi_get_RSDT_entry_vaddr(phys_addr) (ACPI_DESCRIPTION_HEDERS_BASE + MASK_HIGH_32bit(phys_addr) - acpi_RSDT_entry_phys_base)
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static struct acpi_RSDP_t *rsdpv1;
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static struct acpi_RSDP_2_t *rsdpv2;
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static struct acpi_RSDT_Structure_t *rsdt;
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static struct multiboot_tag_old_acpi_t old_acpi;
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static struct multiboot_tag_new_acpi_t new_acpi;
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static ul acpi_RSDT_offset = 0;
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static uint acpi_RSDT_Entry_num = 0;
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// RSDT中的第一个entry所在物理页的基地址
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static ul acpi_RSDT_entry_phys_base = 0;
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/**
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* @brief 迭代器，用于迭代描述符头（位于ACPI标准文件的Table 5-29）
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* @param _fun 迭代操作调用的函数
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* @param _data 数据
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*/
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void acpi_iter_SDT(bool (*_fun)(const struct acpi_system_description_table_header_t *, void *),
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void *_data)
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{
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struct acpi_system_description_table_header_t *sdt_header;
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uint *ent = &(rsdt->Entry);
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for (int i = 0; i < acpi_RSDT_Entry_num; ++i)
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{
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sdt_header = (struct acpi_system_description_table_header_t *)(acpi_get_RSDT_entry_vaddr((ul)(*(ent + i))));
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if (_fun(sdt_header, _data) == true)
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return;
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}
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return;
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}
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/**
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* @brief 获取MADT信息 Multiple APIC Description Table
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*
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* @param _iter_data 要被迭代的信息的结构体
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* @param _data 返回的MADT的虚拟地址
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* @param count 返回数组的长度
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* @return true
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* @return false
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*/
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bool acpi_get_MADT(const struct acpi_system_description_table_header_t *_iter_data, void *_data)
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{
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if (!(_iter_data->Signature[0] == 'A' && _iter_data->Signature[1] == 'P' && _iter_data->Signature[2] == 'I' && _iter_data->Signature[3] == 'C'))
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return false;
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//*(struct acpi_Multiple_APIC_Description_Table_t *)_data = *(struct acpi_Multiple_APIC_Description_Table_t *)_iter_data;
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// 返回MADT的虚拟地址
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*(ul*)_data = _iter_data;
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return true;
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}
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/**
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* @brief 初始化acpi模块
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*
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*/
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void acpi_init()
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{
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kinfo("Initializing ACPI...");
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// 获取rsdp
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int reserved;
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multiboot2_iter(multiboot2_get_acpi_old_RSDP, &old_acpi, &reserved);
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*rsdpv1 = (old_acpi.rsdp);
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kdebug("RSDT_phys_Address=%#018lx", rsdpv1->RsdtAddress);
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kdebug("RSDP_Revision=%d", rsdpv1->Revision);
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// 映射RSDT的物理地址到页表
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// 暂定字节数为2MB
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// 由于页表映射的原因，需要清除低21位地址，才能填入页表
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ul rsdt_phys_base = rsdpv1->RsdtAddress & PAGE_2M_MASK;
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acpi_RSDT_offset = rsdpv1->RsdtAddress - rsdt_phys_base;
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mm_map_phys_addr(ACPI_RSDT_VIRT_ADDR_BASE, rsdt_phys_base, PAGE_2M_SIZE, PAGE_KERNEL_PAGE | PAGE_PWT | PAGE_PCD);
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kdebug("RSDT mapped!");
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multiboot2_iter(multiboot2_get_acpi_new_RSDP, &new_acpi, &reserved);
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*rsdpv2 = new_acpi.rsdp;
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kdebug("Rsdt_v2_phys_Address=%#018lx", rsdpv2->rsdp1.RsdtAddress);
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kdebug("RSDP_v2_Revision=%d", rsdpv2->rsdp1.Revision);
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rsdt = (struct acpi_RSDT_Structure_t *)(ACPI_RSDT_VIRT_ADDR_BASE + acpi_RSDT_offset);
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// 计算RSDT Entry的数量
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kdebug("offset=%d", sizeof(rsdt->header));
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acpi_RSDT_Entry_num = (rsdt->header.Length - 36) / 4;
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printk_color(ORANGE, BLACK, "RSDT Length=%dbytes.\n", rsdt->header.Length);
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printk_color(ORANGE, BLACK, "RSDT Entry num=%d\n", acpi_RSDT_Entry_num);
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// 映射所有的Entry的物理地址
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acpi_RSDT_entry_phys_base = ((ul)(rsdt->Entry)) & PAGE_2M_MASK;
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// 由于地址只是32bit的，并且存在脏数据，这里需要手动清除高32bit，否则会触发#GP
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acpi_RSDT_entry_phys_base = MASK_HIGH_32bit(acpi_RSDT_entry_phys_base);
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kdebug("entry=%#018lx", rsdt->Entry);
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kdebug("acpi_RSDT_entry_phys_base=%#018lx", acpi_RSDT_entry_phys_base);
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// 映射RSDT ENTRY的物理地址
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mm_map_phys_addr(ACPI_DESCRIPTION_HEDERS_BASE, acpi_RSDT_entry_phys_base, PAGE_2M_SIZE, PAGE_KERNEL_PAGE | PAGE_PWT | PAGE_PCD);
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kinfo("ACPI module initialized!")
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} |