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// MIT License, Copyright (c) 2020 Marvin Borner
#include <assert.h>
#include <def.h>
#include <drivers/cpu.h>
#include <drivers/ide.h>
#include <drivers/mbr.h>
#include <drivers/pci.h>
#include <fs.h>
#include <mem.h>
#include <print.h>
#include <str.h>
PROTECTED static u8 *ide_buf = NULL;
struct ata_data {
u8 drive;
};
CLEAR static void ide_select_drive(u8 bus, u8 drive)
{
if (bus == ATA_PRIMARY) {
if (drive == ATA_MASTER)
outb(ATA_PRIMARY_IO + ATA_REG_HDDEVSEL, 0xa0);
else
outb(ATA_PRIMARY_IO + ATA_REG_HDDEVSEL, 0xb0);
} else {
if (drive == ATA_MASTER)
outb(ATA_SECONDARY_IO + ATA_REG_HDDEVSEL, 0xa0);
else
outb(ATA_SECONDARY_IO + ATA_REG_HDDEVSEL, 0xb0);
}
}
CLEAR static u8 ide_find(u8 bus, u8 drive)
{
u16 io = bus == ATA_PRIMARY ? ATA_PRIMARY_IO : ATA_SECONDARY_IO;
ide_select_drive(bus, drive);
// Reset
outb(io + ATA_REG_SECCOUNT0, 0);
outb(io + ATA_REG_LBA0, 0);
outb(io + ATA_REG_LBA1, 0);
outb(io + ATA_REG_LBA2, 0);
// Identify
outb(io + ATA_REG_COMMAND, ATA_CMD_IDENTIFY);
u8 status = inb(io + ATA_REG_STATUS);
if (!status)
return 0;
while ((inb(io + ATA_REG_STATUS) & ATA_SR_BSY) != 0)
;
do {
status = inb(io + ATA_REG_STATUS);
if (status & ATA_SR_ERR)
return 0;
} while ((status & ATA_SR_DRQ) == 0);
for (int i = 0; i < BLOCK_COUNT; i++)
*(u16 *)(ide_buf + i * 2) = inw(io + ATA_REG_DATA);
return 1;
}
static void ide_delay(u16 io) // 400ns
{
for (int i = 0; i < 4; i++)
inb(io + ATA_REG_ALTSTATUS);
}
static void ide_poll(u16 io)
{
while (inb(io + ATA_REG_STATUS) & ATA_SR_BSY)
;
assert(!(inb(io + ATA_REG_STATUS) & ATA_SR_ERR));
}
OPTIMIZE("-Ofast") static res ata_read(void *buf, u32 lba, u32 sector_count, struct vfs_dev *dev)
{
u8 drive = ((struct ata_data *)dev->data)->drive;
u16 io = (drive & ATA_PRIMARY << 1) == ATA_PRIMARY ? ATA_PRIMARY_IO : ATA_SECONDARY_IO;
drive = (drive & ATA_SLAVE) == ATA_SLAVE ? ATA_SLAVE : ATA_MASTER;
u8 cmd = drive == ATA_MASTER ? 0xe0 : 0xf0;
outb(io + ATA_REG_HDDEVSEL, (cmd | (u8)((lba >> 24 & 0x0f))));
outb(io + ATA_REG_FEATURES, 0);
outb(io + ATA_REG_SECCOUNT0, sector_count);
outb(io + ATA_REG_LBA0, (u8)lba);
outb(io + ATA_REG_LBA1, (u8)(lba >> 8));
outb(io + ATA_REG_LBA2, (u8)(lba >> 16));
outb(io + ATA_REG_COMMAND, ATA_CMD_READ_PIO);
u16 *b = buf;
u32 count = sector_count;
while (count-- > 0) {
ide_poll(io);
__asm__ volatile("rep insw" ::"c"(BLOCK_COUNT), "d"(io + ATA_REG_DATA),
"D"((u32)b));
}
ide_delay(io);
return sector_count;
}
u8 ata_pm = 0, ata_ps = 0, ata_sm = 0, ata_ss = 0;
CLEAR static void ata_probe(void)
{
for (u8 i = 0; i < 4; i++) {
u32 bus = i < 2 ? ATA_PRIMARY : ATA_SECONDARY;
u32 drive = i % 2 ? ATA_MASTER : ATA_SLAVE;
if (!ide_find(bus, drive))
continue;
struct ata_data *data = zalloc(sizeof(*data));
data->drive = (bus << 1) | drive;
struct vfs_dev *dev = zalloc(sizeof(*dev));
strlcpy(dev->name, "hd", 3);
dev->name[2] = 'a' + i;
dev->type = DEV_BLOCK;
dev->read = ata_read;
dev->data = data;
vfs_add_dev(dev);
vfs_load(dev);
}
}
CLEAR static void ata_find(u32 device, u16 vendor_id, u16 device_id, void *extra)
{
if ((vendor_id == 0x8086) && (device_id == 0x7010))
*((u32 *)extra) = device;
}
static u32 ata_device_pci = 0;
CLEAR void ata_install(void)
{
pci_scan(&ata_find, -1, &ata_device_pci);
assert(ata_device_pci);
ide_buf = zalloc(SECTOR_SIZE);
ata_probe();
}
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