File size: 1,635 Bytes
8ad4ba9 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | /* NATKERNEL ATA — from Linux drivers/ata/ (138 files, 94K lines) */
#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; }
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