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#include <asm/io.h>
#include <kernel/con.h>
#include <kernel/kernel.h>
#include <stdint.h>
#define ST_ERR 1
#define ST_DRQ 8
#define ST_SRV 16
#define ST_DF 32
#define ST_RDY 64
#define ST_BSY 128
/* sector buffer */
static char sbuf[512];
void hd_init(void) {
int i;
uint8_t s;
uint16_t *buf = (uint16_t*) sbuf;
/* select the master drive */
outb(0x1F6, 0xA0);
/* send the IDENTIFY command */
outb(0x1F7, 0xEC);
while(1) {
s = inb(0x1F7);
if(!s) {
printk("[hd] Master drive not detected on primary bus!\n");
panic();
}
if(s & ST_ERR) {
if(!inb(0x1F4) && !inb(0x1F5))
continue;
printk("[hd] IDENTIFY command error!\n");
panic();
}
if(s & ST_DRQ && !(s & ST_ERR))
break;
}
printk("[hd] Master drive detected on primary bus! (status: 0x%02x)\n", s);
for(i = 0; i < 256; i++)
buf[i] = inw(0x1F0);
}
int hd_read(void *buf, uint32_t lba, uint8_t c) {
int n;
uint8_t s;
uint16_t *p = buf;
if(!c)
return 0;
/* select the master disk on the primary bus */
outb(0x1F6, 0xE0 | ((lba >> 24) & 0xF));
/* set the number of sectors to be read */
outb(0x1F2, c);
/* set the LBA address for the read operation */
outb(0x1F3, lba);
outb(0x1F4, lba >> 8);
outb(0x1F5, lba >> 16);
/* send the READ command */
outb(0x1F7, 0x20);
while(c--) {
/* wait for the drive */
while(1) {
/* poll the drive's status */
s = inb(0x1F7);
if(s & ST_DF) {
printk("[hd] Drive failure!\n");
panic();
}
if(s & ST_ERR)
return -1;
if(!(s & ST_BSY) && s & ST_DRQ)
break;
}
/* buffer is full, copy it's data */
n = 256;
while(n--)
*(p++) = inw(0x1F0);
}
return 0;
}
int hd_write(void *buf, uint32_t lba, uint8_t c) {
int n;
uint8_t s;
uint16_t *p = buf;
if(!c)
return 0;
/* select the master disk on the primary bus */
outb(0x1F6, 0xE0 | ((lba >> 24) & 0xF));
/* set the number of sectors to be written */
outb(0x1F2, c);
/* set the LBA address for the write operation */
outb(0x1F3, lba);
outb(0x1F4, lba >> 8);
outb(0x1F5, lba >> 16);
/* send the WRITE command */
outb(0x1F7, 0x30);
while(c--) {
/* wait for the drive */
while(1) {
/* poll the drive's status */
s = inb(0x1F7);
if(s & ST_DF) {
printk("[hd] Drive failure!\n");
panic();
}
if(s & ST_ERR)
return -1;
if(!(s & ST_BSY) && s & ST_DRQ)
break;
}
/* refill the drive's buffer */
n = 256;
while(n--)
outw(0x1F0, *(p++));
}
return 0;
}
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