mirror of
https://github.com/RGBCube/serenity
synced 2025-07-26 10:57:34 +00:00
Kernel: Move devices into Kernel/Devices/.
This commit is contained in:
Andreas Kling
parent
072ea7eece
commit
ab43658c55
42 changed files with 53 additions and 54 deletions
274
Kernel/Devices/IDEDiskDevice.cpp
Normal file
274
Kernel/Devices/IDEDiskDevice.cpp
Normal file
|
|
@ -0,0 +1,274 @@
|
|||
#include "IDEDiskDevice.h"
|
||||
#include "types.h"
|
||||
#include "Process.h"
|
||||
#include "StdLib.h"
|
||||
#include "IO.h"
|
||||
#include "Scheduler.h"
|
||||
#include "PIC.h"
|
||||
#include <Kernel/Lock.h>
|
||||
|
||||
//#define DISK_DEBUG
|
||||
|
||||
#define IRQ_FIXED_DISK 14
|
||||
|
||||
#define IDE0_DATA 0x1F0
|
||||
#define IDE0_STATUS 0x1F7
|
||||
#define IDE0_COMMAND 0x1F7
|
||||
|
||||
enum IDECommand : byte {
|
||||
IDENTIFY_DRIVE = 0xEC,
|
||||
READ_SECTORS = 0x21,
|
||||
WRITE_SECTORS = 0x30,
|
||||
};
|
||||
|
||||
enum IDEStatus : byte {
|
||||
BUSY = (1 << 7),
|
||||
DRDY = (1 << 6),
|
||||
DF = (1 << 5),
|
||||
SRV = (1 << 4),
|
||||
DRQ = (1 << 3),
|
||||
CORR = (1 << 2),
|
||||
IDX = (1 << 1),
|
||||
ERR = (1 << 0),
|
||||
};
|
||||
|
||||
Retained<IDEDiskDevice> IDEDiskDevice::create()
|
||||
{
|
||||
return adopt(*new IDEDiskDevice);
|
||||
}
|
||||
|
||||
IDEDiskDevice::IDEDiskDevice()
|
||||
: IRQHandler(IRQ_FIXED_DISK)
|
||||
, m_lock("IDEDiskDevice")
|
||||
{
|
||||
initialize();
|
||||
}
|
||||
|
||||
IDEDiskDevice::~IDEDiskDevice()
|
||||
{
|
||||
}
|
||||
|
||||
const char* IDEDiskDevice::class_name() const
|
||||
{
|
||||
return "IDEDiskDevice";
|
||||
}
|
||||
|
||||
unsigned IDEDiskDevice::block_size() const
|
||||
{
|
||||
return 512;
|
||||
}
|
||||
|
||||
bool IDEDiskDevice::read_block(unsigned index, byte* out) const
|
||||
{
|
||||
return const_cast<IDEDiskDevice&>(*this).read_sectors(index, 1, out);
|
||||
}
|
||||
|
||||
bool IDEDiskDevice::write_block(unsigned index, const byte* data)
|
||||
{
|
||||
return write_sectors(index, 1, data);
|
||||
}
|
||||
|
||||
static void print_ide_status(byte status)
|
||||
{
|
||||
kprintf("DRQ=%u BUSY=%u DRDY=%u SRV=%u DF=%u CORR=%u IDX=%u ERR=%u\n",
|
||||
(status & DRQ) != 0,
|
||||
(status & BUSY) != 0,
|
||||
(status & DRDY) != 0,
|
||||
(status & SRV) != 0,
|
||||
(status & DF) != 0,
|
||||
(status & CORR) != 0,
|
||||
(status & IDX) != 0,
|
||||
(status & ERR) != 0);
|
||||
}
|
||||
|
||||
bool IDEDiskDevice::wait_for_irq()
|
||||
{
|
||||
#ifdef DISK_DEBUG
|
||||
kprintf("disk: waiting for interrupt...\n");
|
||||
#endif
|
||||
// FIXME: Add timeout.
|
||||
while (!m_interrupted) {
|
||||
// FIXME: Put this process into a Blocked state instead, it's stupid to wake up just to check a flag.
|
||||
Scheduler::yield();
|
||||
}
|
||||
#ifdef DISK_DEBUG
|
||||
kprintf("disk: got interrupt!\n");
|
||||
#endif
|
||||
memory_barrier();
|
||||
return true;
|
||||
}
|
||||
|
||||
void IDEDiskDevice::handle_irq()
|
||||
{
|
||||
byte status = IO::in8(0x1f7);
|
||||
if (status & ERR) {
|
||||
print_ide_status(status);
|
||||
m_device_error = IO::in8(0x1f1);
|
||||
kprintf("IDEDiskDevice: Error %b!\n", m_device_error);
|
||||
} else {
|
||||
m_device_error = 0;
|
||||
}
|
||||
#ifdef DISK_DEBUG
|
||||
kprintf("disk:interrupt: DRQ=%u BUSY=%u DRDY=%u\n", (status & DRQ) != 0, (status & BUSY) != 0, (status & DRDY) != 0);
|
||||
#endif
|
||||
m_interrupted = true;
|
||||
}
|
||||
|
||||
void IDEDiskDevice::initialize()
|
||||
{
|
||||
#ifdef DISK_DEBUG
|
||||
byte status = IO::in8(IDE0_STATUS);
|
||||
kprintf("initial status: ");
|
||||
print_ide_status(status);
|
||||
#endif
|
||||
|
||||
m_interrupted = false;
|
||||
|
||||
while (IO::in8(IDE0_STATUS) & BUSY);
|
||||
|
||||
enable_irq();
|
||||
|
||||
IO::out8(0x1F6, 0xA0); // 0xB0 for 2nd device
|
||||
IO::out8(0x3F6, 0xA0); // 0xB0 for 2nd device
|
||||
IO::out8(IDE0_COMMAND, IDENTIFY_DRIVE);
|
||||
|
||||
enable_irq();
|
||||
wait_for_irq();
|
||||
|
||||
ByteBuffer wbuf = ByteBuffer::create_uninitialized(512);
|
||||
ByteBuffer bbuf = ByteBuffer::create_uninitialized(512);
|
||||
byte* b = bbuf.pointer();
|
||||
word* w = (word*)wbuf.pointer();
|
||||
const word* wbufbase = (word*)wbuf.pointer();
|
||||
|
||||
for (dword i = 0; i < 256; ++i) {
|
||||
word data = IO::in16(IDE0_DATA);
|
||||
*(w++) = data;
|
||||
*(b++) = MSB(data);
|
||||
*(b++) = LSB(data);
|
||||
}
|
||||
|
||||
// "Unpad" the device name string.
|
||||
for (dword i = 93; i > 54 && bbuf[i] == ' '; --i)
|
||||
bbuf[i] = 0;
|
||||
|
||||
m_cylinders = wbufbase[1];
|
||||
m_heads = wbufbase[3];
|
||||
m_sectors_per_track = wbufbase[6];
|
||||
|
||||
kprintf(
|
||||
"IDEDiskDevice: Master=\"%s\", C/H/Spt=%u/%u/%u\n",
|
||||
bbuf.pointer() + 54,
|
||||
m_cylinders,
|
||||
m_heads,
|
||||
m_sectors_per_track
|
||||
);
|
||||
}
|
||||
|
||||
IDEDiskDevice::CHS IDEDiskDevice::lba_to_chs(dword lba) const
|
||||
{
|
||||
CHS chs;
|
||||
chs.cylinder = lba / (m_sectors_per_track * m_heads);
|
||||
chs.head = (lba / m_sectors_per_track) % m_heads;
|
||||
chs.sector = (lba % m_sectors_per_track) + 1;
|
||||
return chs;
|
||||
}
|
||||
|
||||
bool IDEDiskDevice::read_sectors(dword start_sector, word count, byte* outbuf)
|
||||
{
|
||||
LOCKER(m_lock);
|
||||
#ifdef DISK_DEBUG
|
||||
dbgprintf("%s: Disk::read_sectors request (%u sector(s) @ %u)\n",
|
||||
current->process().name().characters(),
|
||||
count,
|
||||
start_sector);
|
||||
#endif
|
||||
disable_irq();
|
||||
|
||||
auto chs = lba_to_chs(start_sector);
|
||||
|
||||
while (IO::in8(IDE0_STATUS) & BUSY);
|
||||
|
||||
#ifdef DISK_DEBUG
|
||||
kprintf("IDEDiskDevice: Reading %u sector(s) @ LBA %u (%u/%u/%u)\n", count, start_sector, chs.cylinder, chs.head, chs.sector);
|
||||
#endif
|
||||
|
||||
IO::out8(0x1F2, count == 256 ? 0 : LSB(count));
|
||||
IO::out8(0x1F3, chs.sector);
|
||||
IO::out8(0x1F4, LSB(chs.cylinder));
|
||||
IO::out8(0x1F5, MSB(chs.cylinder));
|
||||
|
||||
IO::out8(0x1F6, 0xA0 | chs.head); /* 0xB0 for 2nd device */
|
||||
|
||||
IO::out8(0x3F6, 0x08);
|
||||
while (!(IO::in8(IDE0_STATUS) & DRDY));
|
||||
|
||||
IO::out8(IDE0_COMMAND, READ_SECTORS);
|
||||
m_interrupted = false;
|
||||
enable_irq();
|
||||
wait_for_irq();
|
||||
|
||||
if (m_device_error)
|
||||
return false;
|
||||
|
||||
byte status = IO::in8(0x1f7);
|
||||
if (status & DRQ) {
|
||||
#ifdef DISK_DEBUG
|
||||
kprintf("Retrieving %u bytes (status=%b), outbuf=%p...\n", count * 512, status, outbuf);
|
||||
#endif
|
||||
for (dword i = 0; i < (count * 512); i += 2) {
|
||||
word w = IO::in16(IDE0_DATA);
|
||||
outbuf[i] = LSB(w);
|
||||
outbuf[i+1] = MSB(w);
|
||||
}
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool IDEDiskDevice::write_sectors(dword start_sector, word count, const byte* data)
|
||||
{
|
||||
LOCKER(m_lock);
|
||||
#ifdef DISK_DEBUG
|
||||
dbgprintf("%s(%u): IDEDiskDevice::write_sectors request (%u sector(s) @ %u)\n",
|
||||
current->process().name().characters(),
|
||||
current->pid(),
|
||||
count,
|
||||
start_sector);
|
||||
#endif
|
||||
disable_irq();
|
||||
|
||||
auto chs = lba_to_chs(start_sector);
|
||||
|
||||
while (IO::in8(IDE0_STATUS) & BUSY);
|
||||
|
||||
//dbgprintf("IDEDiskDevice: Writing %u sector(s) @ LBA %u (%u/%u/%u)\n", count, start_sector, chs.cylinder, chs.head, chs.sector);
|
||||
|
||||
IO::out8(0x1F2, count == 256 ? 0 : LSB(count));
|
||||
IO::out8(0x1F3, chs.sector);
|
||||
IO::out8(0x1F4, LSB(chs.cylinder));
|
||||
IO::out8(0x1F5, MSB(chs.cylinder));
|
||||
|
||||
IO::out8(0x1F6, 0xA0 | chs.head); /* 0xB0 for 2nd device */
|
||||
|
||||
IO::out8(0x3F6, 0x08);
|
||||
|
||||
IO::out8(IDE0_COMMAND, WRITE_SECTORS);
|
||||
|
||||
while (!(IO::in8(IDE0_STATUS) & DRQ));
|
||||
|
||||
byte status = IO::in8(0x1f7);
|
||||
if (status & DRQ) {
|
||||
//dbgprintf("Sending %u bytes (status=%b), data=%p...\n", count * 512, status, data);
|
||||
auto* data_as_words = (const word*)data;
|
||||
for (dword i = 0; i < (count * 512) / 2; ++i) {
|
||||
IO::out16(IDE0_DATA, data_as_words[i]);
|
||||
}
|
||||
}
|
||||
|
||||
m_interrupted = false;
|
||||
enable_irq();
|
||||
wait_for_irq();
|
||||
|
||||
return !m_device_error;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue