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🆕 从multiboot2获取RSDT结构体

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This commit is contained in:
fslongjin
2022-03-13 12:53:32 +08:00
parent e64be7b4df
commit a879bada0a
7 changed files with 115 additions and 23 deletions
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51
kernel/driver/acpi/acpi.c
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@ -2,33 +2,64 @@
#include "../../common/printk.h"
#include "../../common/kprint.h"
#include "../multiboot2/multiboot2.h"
#include "../../mm/mm.h"
static struct acpi_RSDP_t *rsdp;
static struct acpi_RSDP_t *rsdpv1;
static struct acpi_RSDP_2_t *rsdpv2;
static struct acpi_RSDT_Structure_t *rsdt;
static ul acpi_RSDT_offset = 0;
static uint acpi_RSDT_Entry_num = 0;
/**
* @brief 迭代器，用于迭代描述符头（位于ACPI标准文件的Table 5-29）
* @param _fun 迭代操作调用的函数
* @param _data 数据
*/
void acpi_iter_SDT(bool (*_fun)(const struct acpi_iter_SDT_header_t *, void *),
void *_data)
void *_data)
{
}
/**
* @brief 初始化acpi模块
*
*
*/
void acpi_init()
{
kinfo("Initializing ACPI...");
struct multiboot_tag_old_acpi_t* tmp1;
// 获取rsdp
struct multiboot_tag_old_acpi_t tmp1;
int reserved;
kdebug("yyyy");
multiboot2_iter(multiboot2_get_acpi_old_RSDP, tmp1, &reserved);
kdebug("1");
*rsdp = *(struct acpi_RSDP_t*)(tmp1->rsdp);
multiboot2_iter(multiboot2_get_acpi_old_RSDP, &tmp1, &reserved);
kdebug("RsdtAddress=%#018lx", rsdp->RsdtAddress);
*rsdpv1 = (tmp1.rsdp);
kdebug("Rsdt_phys_Address=%#018lx", rsdpv1->RsdtAddress);
kdebug("RSDP_Revision=%d", rsdpv1->Revision);
// 映射RSDT区域的物理地址到页表
// 暂定字节数为2MB
// 由于页表映射的原因，需要清除低21位地址，才能填入页表
ul base = rsdpv1->RsdtAddress & (~(0x1fffff));
acpi_RSDT_offset = rsdpv1->RsdtAddress - base;
mm_map_phys_addr(ACPI_RSDT_VIRT_ADDR_BASE, base, PAGE_2M_SIZE, PAGE_KERNEL_PAGE | PAGE_PWT | PAGE_PCD);
kdebug("RSDT mapped!");
struct multiboot_tag_new_acpi_t tmp2;
multiboot2_iter(multiboot2_get_acpi_new_RSDP, &tmp2, &reserved);
*rsdpv2 = tmp2.rsdp;
kdebug("Rsdt_v2_phys_Address=%#018lx", rsdpv2->rsdp1.RsdtAddress);
kdebug("RSDP_v2_Revision=%d", rsdpv2->rsdp1.Revision);
rsdt = ACPI_RSDT_VIRT_ADDR_BASE + acpi_RSDT_offset;
// 计算RSDT Entry的数量
acpi_RSDT_Entry_num = (rsdt->header.Length - 32) / 4;
printk_color(ORANGE, BLACK, "%s\n", rsdt->header.Signature);
printk_color(ORANGE, BLACK, "RSDT Length=%dbytes.\n", rsdt->header.Length);
printk_color(ORANGE, BLACK, "RSDT Entry num=%d\n", acpi_RSDT_Entry_num);
}

2
kernel/driver/acpi/acpi.h
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@ -25,6 +25,8 @@
// 0x10-0x7f Reserved. OSPM skips structures of the reserved type.
// 0x80-0xff Reserved for OEM use
#define ACPI_RSDT_VIRT_ADDR_BASE 0xffff80000a000000UL
struct acpi_RSDP_t
{
unsigned char Signature[8];