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Merge Disk namespace into the IDEDiskDevice class.

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This commit is contained in:
Andreas Kling 2018-11-10 15:15:31 +01:00
parent cba05ce75e
commit b8264e7d47
Notes: sideshowbarker 2024-07-19 16:11:37 +09:00
10 changed files with 231 additions and 244 deletions
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1
AK/Lock.h
View file

@ -1,5 +1,6 @@
#pragma once
#include "Assertions.h"
#include "Types.h"
#ifdef SERENITY

194
Kernel/Disk.cpp
View file

@ -1,194 +0,0 @@
#include "types.h"
#include "Process.h"
#include "VGA.h"
#include "Disk.h"
#include "kmalloc.h"
#include "StdLib.h"
#include "IO.h"
#include "i386.h"
#include "PIC.h"
#include <AK/Lock.h>
//#define DISK_DEBUG
extern "C" void handle_interrupt();
namespace Disk {
ide_drive_t drive[4];
static volatile bool interrupted;
#define IRQ_FIXED_DISK 14
extern "C" void ide_ISR();
asm(
".globl ide_ISR \n"
"ide_ISR: \n"
" pusha\n"
" pushw %ds\n"
" pushw %es\n"
" pushw %ss\n"
" pushw %ss\n"
" popw %ds\n"
" popw %es\n"
" call handle_interrupt\n"
" popw %es\n"
" popw %ds\n"
" popa\n"
" iret\n"
);
static void enableIRQ()
{
PIC::enable(IRQ_FIXED_DISK);
}
static void disableIRQ()
{
PIC::disable(IRQ_FIXED_DISK);
}
static bool waitForInterrupt()
{
#ifdef DISK_DEBUG
kprintf("disk: waiting for interrupt...\n");
#endif
// FIXME: Add timeout.
while (!interrupted) {
sched_yield();
}
#ifdef DISK_DEBUG
kprintf("disk: got interrupt!\n");
#endif
return true;
}
void interrupt()
{
IRQHandlerScope scope(IRQ_FIXED_DISK);
#ifdef DISK_DEBUG
BYTE status = IO::in8(0x1f7);
kprintf("disk:interrupt: DRQ=%u BUSY=%u DRDY=%u\n", (status & DRQ) != 0, (status & BUSY) != 0, (status & DRDY) != 0);
#endif
interrupted = true;
}
static SpinLock* s_diskLock;
void initialize()
{
s_diskLock = new SpinLock;
disableIRQ();
interrupted = false;
registerInterruptHandler(IRQ_VECTOR_BASE + IRQ_FIXED_DISK, ide_ISR);
while (IO::in8(IDE0_STATUS) & BUSY);
IO::out8(0x1F6, 0xA0); // 0xB0 for 2nd device
IO::out8(IDE0_COMMAND, IDENTIFY_DRIVE);
enableIRQ();
waitForInterrupt();
ByteBuffer wbuf = ByteBuffer::createUninitialized(512);
ByteBuffer bbuf = ByteBuffer::createUninitialized(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;
drive[0].cylinders = wbufbase[1];
drive[0].heads = wbufbase[3];
drive[0].sectors_per_track = wbufbase[6];
kprintf(
"ide0: Master=\"%s\", C/H/Spt=%u/%u/%u\n",
bbuf.pointer() + 54,
drive[0].cylinders,
drive[0].heads,
drive[0].sectors_per_track
);
}
struct CHS {
DWORD cylinder;
WORD head;
WORD sector;
};
static CHS lba2chs(BYTE drive_index, DWORD lba)
{
ide_drive_t& d = drive[drive_index];
CHS chs;
chs.cylinder = lba / (d.sectors_per_track * d.heads);
chs.head = (lba / d.sectors_per_track) % d.heads;
chs.sector = (lba % d.sectors_per_track) + 1;
return chs;
}
bool readSectors(DWORD startSector, WORD count, BYTE* outbuf)
{
LOCKER(*s_diskLock);
#ifdef DISK_DEBUG
kprintf("%s: Disk::readSectors request (%u sector(s) @ %u)\n",
current->name().characters(),
count,
startSector);
#endif
disableIRQ();
CHS chs = lba2chs(IDE0_DISK0, startSector);
while (IO::in8(IDE0_STATUS) & BUSY);
#ifdef DISK_DEBUG
kprintf("ide0: Reading %u sector(s) @ LBA %u (%u/%u/%u)\n", count, startSector, 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);
interrupted = false;
enableIRQ();
waitForInterrupt();
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;
}
}
extern "C" void handle_interrupt()
{
Disk::interrupt();
}

34
Kernel/Disk.h
View file

@ -1,34 +0,0 @@
#pragma once
#include "types.h"
#define IDE0_DATA 0x1F0
#define IDE0_STATUS 0x1F7
#define IDE0_COMMAND 0x1F7
#define BUSY 0x80
#define DRDY 0x40
#define DRQ 0x08
#define IDENTIFY_DRIVE 0xEC
#define READ_SECTORS 0x21
#define IDE0_DISK0 0
#define IDE0_DISK1 1
#define IDE1_DISK0 2
#define IDE1_DISK1 3
typedef struct
{
WORD cylinders;
WORD heads;
WORD sectors_per_track;
} ide_drive_t;
extern void ide_init();
extern ide_drive_t drive[4];
namespace Disk {
void initialize();
bool readSectors(DWORD sectorIndex, WORD count, BYTE* buffer);
}

186
Kernel/IDEDiskDevice.cpp
View file

@ -1,5 +1,35 @@
#include "IDEDiskDevice.h"
#include "Disk.h"
#include "types.h"
#include "Process.h"
#include "StdLib.h"
#include "IO.h"
#include "Scheduler.h"
#include "PIC.h"
#include <AK/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,
};
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),
};
RetainPtr<IDEDiskDevice> IDEDiskDevice::create()
{
@ -7,7 +37,9 @@ RetainPtr<IDEDiskDevice> IDEDiskDevice::create()
}
IDEDiskDevice::IDEDiskDevice()
: IRQHandler(IRQ_FIXED_DISK)
{
initialize();
}
IDEDiskDevice::~IDEDiskDevice()
@ -26,7 +58,7 @@ unsigned IDEDiskDevice::blockSize() const
bool IDEDiskDevice::readBlock(unsigned index, byte* out) const
{
Disk::readSectors(index, 1, out);
const_cast<IDEDiskDevice&>(*this).read_sectors(index, 1, out);
return true;
}
@ -39,3 +71,153 @@ bool IDEDiskDevice::writeBlock(unsigned index, const byte* data)
return false;
}
#ifdef DISK_DEBUG
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);
}
#endif
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
return true;
}
void IDEDiskDevice::handleIRQ()
{
#ifdef DISK_DEBUG
byte status = IO::in8(0x1f7);
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()
{
byte status;
status = IO::in8(IDE0_STATUS);
#ifdef DISK_DEBUG
kprintf("initial status: ");
print_ide_status(status);
#endif
m_interrupted = false;
while (IO::in8(IDE0_STATUS) & BUSY);
enableIRQ();
IO::out8(0x1F6, 0xA0); // 0xB0 for 2nd device
IO::out8(0x3F6, 0xA0); // 0xB0 for 2nd device
IO::out8(IDE0_COMMAND, IDENTIFY_DRIVE);
enableIRQ();
wait_for_irq();
ByteBuffer wbuf = ByteBuffer::createUninitialized(512);
ByteBuffer bbuf = ByteBuffer::createUninitialized(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(
"ide0: 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
kprintf("%s: Disk::read_sectors request (%u sector(s) @ %u)\n",
current->name().characters(),
count,
start_sector);
#endif
disableIRQ();
auto chs = lba_to_chs(start_sector);
while (IO::in8(IDE0_STATUS) & BUSY);
#ifdef DISK_DEBUG
kprintf("ide0: 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;
enableIRQ();
wait_for_irq();
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;
}

29
Kernel/IDEDiskDevice.h
View file

@ -1,13 +1,16 @@
#pragma once
#include <AK/Lock.h>
#include <AK/RetainPtr.h>
#include <VirtualFileSystem/DiskDevice.h>
#include "IRQHandler.h"
class IDEDiskDevice final : public DiskDevice {
class IDEDiskDevice final : public IRQHandler, public DiskDevice {
public:
static RetainPtr<IDEDiskDevice> create();
virtual ~IDEDiskDevice();
virtual ~IDEDiskDevice() override;
// ^DiskDevice
virtual unsigned blockSize() const override;
virtual bool readBlock(unsigned index, byte*) const override;
virtual bool writeBlock(unsigned index, const byte*) override;
@ -16,6 +19,28 @@ protected:
IDEDiskDevice();
private:
// ^IRQHandler
virtual void handleIRQ() override;
// ^DiskDevice
virtual const char* className() const override;
struct CHS {
dword cylinder;
word head;
word sector;
};
CHS lba_to_chs(dword) const;
void initialize();
bool wait_for_irq();
bool read_sectors(dword start_sector, word count, byte* outbuf);
SpinLock m_lock;
word m_cylinders { 0 };
word m_heads { 0 };
word m_sectors_per_track { 0 };
mutable volatile bool m_interrupted { false };
};

1
Kernel/Makefile
View file

@ -11,7 +11,6 @@ KERNEL_OBJS = \
CMOS.o \
PIC.o \
Syscall.o \
Disk.o \
IDEDiskDevice.o \
MemoryManager.o \
Console.o \

9
Kernel/PIC.cpp
View file

@ -100,4 +100,13 @@ word getISR()
return (isr1 << 8) | isr0;
}
word get_irr()
{
IO::out8(PIC0_CTL, 0x0a);
IO::out8(PIC1_CTL, 0x0a);
byte irr0 = IO::in8(PIC0_CTL);
byte irr1 = IO::in8(PIC1_CTL);
return (irr1 << 8) | irr0;
}
}

1
Kernel/PIC.h
View file

@ -9,6 +9,7 @@ void disable(BYTE number);
void eoi(BYTE number);
void initialize();
word getISR();
word get_irr();
}

17
Kernel/i386.cpp
View file

@ -38,12 +38,12 @@ void gdt_free_entry(word entry)
s_gdt_freelist->append(entry);
}
extern "C" void handleIRQ();
extern "C" void commonIRQEntry();
extern "C" void handle_irq();
extern "C" void asm_irq_entry();
asm(
".globl commonIRQEntry\n"
"commonIRQEntry: \n"
".globl asm_irq_entry\n"
"asm_irq_entry: \n"
" pusha\n"
" pushw %ds\n"
" pushw %es\n"
@ -51,7 +51,7 @@ asm(
" pushw %ss\n"
" popw %ds\n"
" popw %es\n"
" call handleIRQ\n"
" call handle_irq\n"
" popw %es\n"
" popw %ds\n"
" popa\n"
@ -349,8 +349,7 @@ void registerIRQHandler(byte irq, IRQHandler& handler)
{
ASSERT(!s_irqHandler[irq]);
s_irqHandler[irq] = &handler;
kprintf("irq handler for %u: %p\n", irq, &handler);
registerInterruptHandler(IRQ_VECTOR_BASE + irq, commonIRQEntry);
registerInterruptHandler(IRQ_VECTOR_BASE + irq, asm_irq_entry);
}
void unregisterIRQHandler(byte irq, IRQHandler& handler)
@ -433,7 +432,7 @@ void load_task_register(WORD selector)
asm("ltr %0"::"r"(selector));
}
void handleIRQ()
void handle_irq()
{
WORD isr = PIC::getISR();
if (!isr) {
@ -443,6 +442,8 @@ void handleIRQ()
byte irq = 0;
for (byte i = 0; i < 16; ++i) {
if (i == 2)
continue;
if (isr & (1 << i)) {
irq = i;
break;

3
Kernel/init.cpp
View file

@ -6,7 +6,6 @@
#include "Keyboard.h"
#include "Process.h"
#include "system.h"
#include "Disk.h"
#include "PIC.h"
#include "StdLib.h"
#include "Syscall.h"
@ -176,8 +175,6 @@ static void init_stage2()
{
Syscall::initialize();
Disk::initialize();
#ifdef TEST_VFS
auto vfs = make<VirtualFileSystem>();