#include "threads/interrupt.h"
#include "threads/synch.h"
+/* The code in this file is an interface to an ATA (IDE)
+ controller. It attempts to comply to [ATA-3]. */
+
/* ATA command block port addresses. */
#define reg_data(CHANNEL) ((CHANNEL)->reg_base + 0) /* Data. */
#define reg_error(CHANNEL) ((CHANNEL)->reg_base + 1) /* Error. */
/* Alternate Status Register bits. */
#define STA_BSY 0x80 /* Busy. */
+#define STA_DRDY 0x40 /* Device Ready. */
#define STA_DRQ 0x08 /* Data Request. */
/* Control Register bits. */
int dev_no; /* Device 0 or 1 for master or slave. */
bool is_ata; /* 1=This device is an ATA disk. */
- disk_sector_t capacity; /* Capacity in sectors (if is_ata is true). */
+ disk_sector_t capacity; /* Capacity in sectors (if is_ata). */
+
+ long long read_cnt; /* Number of sectors read. */
+ long long write_cnt; /* Number of sectors written. */
};
/* An ATA channel (aka controller).
int dev_no;
/* Initialize channel. */
- snprintf (c->name, sizeof c->name, "hd%zd", chan_no);
+ snprintf (c->name, sizeof c->name, "hd%zu", chan_no);
switch (chan_no)
{
case 0:
default:
NOT_REACHED ();
}
- lock_init (&c->lock, c->name);
+ lock_init (&c->lock);
c->expecting_interrupt = false;
- sema_init (&c->completion_wait, 0, c->name);
+ sema_init (&c->completion_wait, 0);
/* Initialize devices. */
for (dev_no = 0; dev_no < 2; dev_no++)
d->is_ata = false;
d->capacity = 0;
+
+ d->read_cnt = d->write_cnt = 0;
}
/* Register interrupt handler. */
- intr_register (c->irq, 0, INTR_OFF, interrupt_handler, c->name);
+ intr_register_ext (c->irq, interrupt_handler, c->name);
/* Reset hardware. */
reset_channel (c);
}
}
+/* Prints disk statistics. */
+void
+disk_print_stats (void)
+{
+ int chan_no;
+
+ for (chan_no = 0; chan_no < CHANNEL_CNT; chan_no++)
+ {
+ int dev_no;
+
+ for (dev_no = 0; dev_no < 2; dev_no++)
+ {
+ struct disk *d = disk_get (chan_no, dev_no);
+ if (d != NULL && d->is_ata)
+ printf ("%s: %lld reads, %lld writes\n",
+ d->name, d->read_cnt, d->write_cnt);
+ }
+ }
+}
+
/* Returns the disk numbered DEV_NO--either 0 or 1 for master or
- slave, respectively--within the channel numbered CHAN_NO. */
+ slave, respectively--within the channel numbered CHAN_NO.
+
+ Pintos uses disks this way:
+ 0:0 - boot loader, command line args, and operating system kernel
+ 0:1 - file system
+ 1:0 - scratch
+ 1:1 - swap
+*/
struct disk *
disk_get (int chan_no, int dev_no)
{
}
/* Reads sector SEC_NO from disk D into BUFFER, which must have
- room for DISK_SECTOR_SIZE bytes. */
+ room for DISK_SECTOR_SIZE bytes.
+ Internally synchronizes accesses to disks, so external
+ per-disk locking is unneeded. */
void
disk_read (struct disk *d, disk_sector_t sec_no, void *buffer)
{
if (!wait_while_busy (d))
PANIC ("%s: disk read failed, sector=%"PRDSNu, d->name, sec_no);
input_sector (c, buffer);
+ d->read_cnt++;
lock_release (&c->lock);
}
/* Write sector SEC_NO to disk D from BUFFER, which must contain
DISK_SECTOR_SIZE bytes. Returns after the disk has
- acknowledged receiving the data. */
+ acknowledged receiving the data.
+ Internally synchronizes accesses to disks, so external
+ per-disk locking is unneeded. */
void
disk_write (struct disk *d, disk_sector_t sec_no, const void *buffer)
{
PANIC ("%s: disk write failed, sector=%"PRDSNu, d->name, sec_no);
output_sector (c, buffer);
sema_down (&c->completion_wait);
+ d->write_cnt++;
lock_release (&c->lock);
}
\f
/* Issue soft reset sequence, which selects device 0 as a side effect.
Also enable interrupts. */
outb (reg_ctl (c), 0);
- timer_sleep (timer_us2ticks (10));
+ timer_usleep (10);
outb (reg_ctl (c), CTL_SRST);
- timer_sleep (timer_us2ticks (10));
+ timer_usleep (10);
outb (reg_ctl (c), 0);
- timer_sleep (timer_ms2ticks (150));
+ timer_msleep (150);
/* Wait for device 0 to clear BSY. */
if (present[0])
{
if (inb (reg_nsect (c)) == 1 && inb (reg_lbal (c)) == 1)
break;
- timer_sleep (timer_ms2ticks (10));
+ timer_msleep (10);
}
wait_while_busy (&c->devices[1]);
}
check_device_type (struct disk *d)
{
struct channel *c = d->channel;
- uint8_t error, lbam, lbah;
+ uint8_t error, lbam, lbah, status;
select_device (d);
error = inb (reg_error (c));
lbam = inb (reg_lbam (c));
lbah = inb (reg_lbah (c));
+ status = inb (reg_status (c));
- if (error != 1 && (error != 0x81 || d->dev_no == 1))
+ if ((error != 1 && (error != 0x81 || d->dev_no == 1))
+ || (status & STA_DRDY) == 0
+ || (status & STA_BSY) != 0)
{
d->is_ata = false;
return error != 0x81;
{
if ((inb (reg_status (d->channel)) & (STA_BSY | STA_DRQ)) == 0)
return;
- timer_sleep (timer_us2ticks (10));
+ timer_usleep (10);
}
printf ("%s: idle timeout\n", d->name);
printf ("ok\n");
return (inb (reg_alt_status (c)) & STA_DRQ) != 0;
}
- timer_sleep (timer_ms2ticks (10));
+ timer_msleep (10);
}
printf ("failed\n");
dev |= DEV_DEV;
outb (reg_device (c), dev);
inb (reg_alt_status (c));
- timer_sleep (timer_ns2ticks (400));
+ timer_nsleep (400);
}
/* Select disk D in its channel, as select_device(), but wait for
projects / pintos-anon / blobdiff