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🆕 读取fat32文件系统的基础信息

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This commit is contained in:
fslongjin
2022-04-19 20:56:01 +08:00
parent 39dd802ff1
commit 979bb35599
10 changed files with 185 additions and 25 deletions
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42
kernel/filesystem/fat32/fat32.c Normal file
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#include "fat32.h"
#include <common/kprint.h>
#include <driver/disk/ahci/ahci.h>
/**
* @brief 读取指定磁盘上的第0个分区的fat32文件系统
*
* @param disk_num
*/
void fat32_FS_init(int disk_num)
{
int i;
unsigned char buf[512];
struct MBR_disk_partition_table_t DPT;
struct fat32_BootSector_t fat32_bootsector;
struct fat32_FSInfo_t fat32_fsinfo;
memset(buf, 0, 512);
ahci_operation.transfer(ATA_CMD_READ_DMA_EXT, 0, 1, (uint64_t)&buf, 0, 0);
DPT = *(struct MBR_disk_partition_table_t *)buf;
// for(i = 0 ;i < 512 ; i++)
// color_printk(PURPLE,WHITE,"%02x",buf[i]);
printk_color(ORANGE, BLACK, "DPTE[0] start_LBA:%#018lx\ttype:%#018lx\n", DPT.DPTE[0].starting_LBA, DPT.DPTE[0].type);
memset(buf, 0, 512);
ahci_operation.transfer(ATA_CMD_READ_DMA_EXT, DPT.DPTE[0].starting_LBA, 1, (uint64_t)&buf, 0, 0);
fat32_bootsector = *(struct fat32_BootSector_t *)buf;
// for(i = 0 ;i < 512 ; i++)
// printk_color(PURPLE,WHITE,"%02x",buf[i]);
printk_color(ORANGE, BLACK, "FAT32 Boot Sector\n\tBPB_FSInfo:%#018lx\n\tBPB_BkBootSec:%#018lx\n\tBPB_TotSec32:%#018lx\n", fat32_bootsector.BPB_FSInfo, fat32_bootsector.BPB_BkBootSec, fat32_bootsector.BPB_TotSec32);
memset(buf, 0, 512);
ahci_operation.transfer(ATA_CMD_READ_DMA_EXT, DPT.DPTE[0].starting_LBA+ fat32_bootsector.BPB_FSInfo, 1, (uint64_t)&buf, 0, 0);
fat32_fsinfo = *(struct fat32_FSInfo_t *)buf;
// for(i = 0 ;i < 512 ; i++)
// printk_color(PURPLE,WHITE,"%02x",buf[i]);
printk_color(ORANGE, BLACK, "FAT32 FSInfo\n\tFSI_LeadSig:%#018lx\n\tFSI_StrucSig:%#018lx\n\tFSI_Free_Count:%#018lx\n", fat32_fsinfo.FSI_LeadSig, fat32_fsinfo.FSI_StrucSig, fat32_fsinfo.FSI_Free_Count);
}