| |
| #include "../kernel.h" |
|
|
| #define ATA_DATA 0x1F0 |
| #define ATA_ERR 0x1F1 |
| #define ATA_FEAT 0x1F1 |
| #define ATA_SEC 0x1F2 |
| #define ATA_LBAL 0x1F3 |
| #define ATA_LBAM 0x1F4 |
| #define ATA_LBAH 0x1F5 |
| #define ATA_DRIVE 0x1F6 |
| #define ATA_CMD 0x1F7 |
| #define ATA_STAT 0x1F7 |
| #define ATA_READ 0x20 |
| #define ATA_WRITE 0x30 |
| #define ATA_IDENTIFY 0xEC |
|
|
| static u8 ata_present; |
|
|
| void ata_init(void) { |
| outb(ATA_DRIVE, 0xA0); |
| outb(ATA_CMD, ATA_IDENTIFY); |
| if(inb(ATA_STAT)==0) { ata_present=0; return; } |
| while(inb(ATA_STAT)&0x80); |
| while(!(inb(ATA_STAT)&0x08)); |
| ata_present=1; |
| } |
|
|
| static int ata_wait(void) { |
| for(u32 i=0;i<100000;i++) { |
| u8 s=inb(ATA_STAT); |
| if(!(s&0x80)&&(s&0x08)) return 1; |
| } |
| return 0; |
| } |
|
|
| int ata_read(u32 lba, void* buf, u16 cnt) { |
| if(!ata_present) return 0; |
| outb(ATA_DRIVE, 0xE0|((lba>>24)&0x0F)); |
| outb(ATA_FEAT, 0); outb(ATA_SEC, cnt&0xFF); outb(ATA_LBAL, lba&0xFF); |
| outb(ATA_LBAM, (lba>>8)&0xFF); outb(ATA_LBAH, (lba>>16)&0xFF); |
| outb(ATA_CMD, ATA_READ); |
| if(!ata_wait()) return 0; |
| for(u32 i=0;i<cnt*256;i++) ((u16*)buf)[i]=inw(ATA_DATA); |
| return cnt; |
| } |
|
|
| int ata_write(u32 lba, const void* buf, u16 cnt) { |
| if(!ata_present) return 0; |
| outb(ATA_DRIVE, 0xE0|((lba>>24)&0x0F)); |
| outb(ATA_SEC, cnt&0xFF); outb(ATA_LBAL, lba&0xFF); |
| outb(ATA_LBAM, (lba>>8)&0xFF); outb(ATA_LBAH, (lba>>16)&0xFF); |
| outb(ATA_CMD, ATA_WRITE); |
| if(!ata_wait()) return 0; |
| for(u32 i=0;i<cnt*256;i++) outw(ATA_DATA, ((u16*)buf)[i]); |
| return cnt; |
| } |
|
|
| int ata_present_dev(void) { return ata_present; } |
|
|
