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65 lines
2.0 KiB
C
65 lines
2.0 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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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 ul acpi_RSDT_offset = 0;
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static uint acpi_RSDT_Entry_num = 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_iter_SDT_header_t *, void *),
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void *_data)
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{
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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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struct multiboot_tag_old_acpi_t tmp1;
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int reserved;
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multiboot2_iter(multiboot2_get_acpi_old_RSDP, &tmp1, &reserved);
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*rsdpv1 = (tmp1.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区域的物理地址到页表
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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 base = rsdpv1->RsdtAddress & (~(0x1fffff));
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acpi_RSDT_offset = rsdpv1->RsdtAddress - base;
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mm_map_phys_addr(ACPI_RSDT_VIRT_ADDR_BASE, base, PAGE_2M_SIZE, PAGE_KERNEL_PAGE | PAGE_PWT | PAGE_PCD);
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kdebug("RSDT mapped!");
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struct multiboot_tag_new_acpi_t tmp2;
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multiboot2_iter(multiboot2_get_acpi_new_RSDP, &tmp2, &reserved);
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*rsdpv2 = tmp2.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 = ACPI_RSDT_VIRT_ADDR_BASE + acpi_RSDT_offset;
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// 计算RSDT Entry的数量
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acpi_RSDT_Entry_num = (rsdt->header.Length - 32) / 4;
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printk_color(ORANGE, BLACK, "%s\n", rsdt->header.Signature);
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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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} |