Reading from HDD is now possible !

4 files changed, 201 insertions, 0 deletions

diff --git a/Source/Kernel/Devices/ATA/ATAController.class.cpp b/Source/Kernel/Devices/ATA/ATAController.class.cpp
new file mode 100644
index 0000000..69a18a4
--- /dev/null
+++ b/Source/Kernel/Devices/ATA/ATAController.class.cpp
@@ -0,0 +1,53 @@
+#include "ATADrive.class.h"
+
+#include <DeviceManager/Dev.ns.h>
+#include <VFS/Part.ns.h>
+
+String ATAController::getClass() {
+	return "controller.ata";
+}
+
+String ATAController::getName() {
+	return String("ATA controller #") + String::number(m_number);
+}
+
+void ATAController::detect() {
+	ATAController *c[2];
+	c[0] = new ATAController(ATA_BUS1_BASE, 0);
+	c[1] = new ATAController(ATA_BUS2_BASE, 1);
+	Dev::registerDevice(c[0]); Dev::registerDevice(c[1]);
+	for (u32int d = 0; d < 2; d++) {
+		for (u32int r = 0; r < 2; r++) {
+			ATADrive* drv = c[d]->m_drives[r];
+			if (drv != 0) {
+				Dev::registerDevice(drv);
+				Part::registerDevice(drv);
+			}
+		}
+	}
+}
+
+ATAController::ATAController(u32int base, u8int number) {
+	m_base = base; m_number = number;
+	m_drives[0] = NULL; m_drives[1] = NULL;
+	identify(false);	//Identify master device
+	identify(true);		//Identify slave device
+}
+
+void ATAController::identify(bool slave) {
+	if (m_drives[(slave ? 1 : 0)] != NULL) return;
+	writeByte(ATA_PORT_DRIVE_SELECT, (slave ? 0xB0 : 0xA0)); 
+	writeByte(ATA_PORT_COMMAND, ATA_CMD_IDENTIFY);
+	u8int ret = readByte(ATA_PORT_COMMAND);
+	if (ret == 0) return;	//Drive does not exist
+	while ((ret & 0x88) != 0x08 and (ret & 1) != 1) {
+		ret = readByte(ATA_PORT_COMMAND);
+	}
+	if ((ret & 1) == 1) return;	//Error while IDENTIFY
+	u16int data[256];
+	for (u32int i = 0; i < 256; i++) data[i] = readWord(ATA_PORT_DATA);
+	u32int blocks = (data[61] << 16) | data[60];
+	if (blocks != 0) {	//Drive supports LBA28
+		m_drives[(slave ? 1 : 0)] = new ATADrive(this, slave, blocks, data);
+	}
+}
diff --git a/Source/Kernel/Devices/ATA/ATAController.class.h b/Source/Kernel/Devices/ATA/ATAController.class.h
new file mode 100644
index 0000000..a12b835
--- /dev/null
+++ b/Source/Kernel/Devices/ATA/ATAController.class.h
@@ -0,0 +1,47 @@
+#ifndef DEF_ATACONTROLLER_CLASS_H
+#define DEF_ATACONTROLLER_CLASS_H
+
+#include <Devices/Device.proto.h>
+
+#define ATA_BUS1_BASE 0x1F0
+#define ATA_BUS2_BASE 0x170
+
+#define ATA_PORT_DATA 0
+#define ATA_PORT_FEATURES_ERROR 1
+#define ATA_PORT_SECT_COUNT 2
+#define ATA_PORT_PARTIAL1 3
+#define ATA_PORT_PARTIAL2 4
+#define ATA_PORT_PARTIAL3 5
+#define ATA_PORT_DRIVE_SELECT 6
+#define ATA_PORT_COMMAND 7
+
+#define ATA_CMD_IDENTIFY 0xEC
+#define ATA_CMD_READ 0x20
+#define ATA_CMD_WRITE 0x30
+
+class ATADrive;
+
+class ATAController : public Device {
+	friend class ATADrive;
+	private:
+	ATAController(u32int base, u8int number);
+
+	u32int m_base;
+	u8int m_number;
+
+	ATADrive* m_drives[2];
+
+	void writeWord(u16int port, u16int word) { Sys::outw(m_base + port, word); }
+	void writeByte(u16int port, u8int byte) { Sys::outb(m_base + port, byte); }
+	u8int readByte(u16int port) { return Sys::inb(m_base + port); }
+	u16int readWord(u16int port) { return Sys::inw(m_base + port); }
+
+	void identify(bool slave);	//Identifies a drive and adds it to m_drives
+
+	public:
+	static void detect();
+	String getClass();
+	String getName();
+};
+
+#endif
diff --git a/Source/Kernel/Devices/ATA/ATADrive.class.cpp b/Source/Kernel/Devices/ATA/ATADrive.class.cpp
new file mode 100644
index 0000000..d9cc4a7
--- /dev/null
+++ b/Source/Kernel/Devices/ATA/ATADrive.class.cpp
@@ -0,0 +1,71 @@
+#include "ATADrive.class.h"
+
+String ATADrive::getClass() {
+	return "block.ata";
+}
+
+String ATADrive::getName() {
+	return String("ATA drive ") += String::number(m_ctrlr->m_number) += String(m_isSlave ? ".slave " : ".master ")
+		+= String::number(m_blockCount / (1024 * 1024 / blockSize())) += "MB";
+}
+
+ATADrive::ATADrive(ATAController* ctrlr, bool isSlave, u32int blockCount, u16int* identifyData) {
+	m_ctrlr = ctrlr;
+	m_isSlave = isSlave;
+	m_blockCount = blockCount;
+	for (u32int i = 0; i < 256; i++) m_identifyData[i] = identifyData[i];
+}
+
+bool ATADrive::readOnly() {
+	return true;
+}
+
+u64int ATADrive::blocks() {
+	return m_blockCount;
+}
+
+void ATADrive::cmdCommon(u32int numblock, u32int count) {
+	m_ctrlr->writeByte(ATA_PORT_FEATURES_ERROR, 0);
+	m_ctrlr->writeByte(ATA_PORT_SECT_COUNT, count);
+	m_ctrlr->writeByte(ATA_PORT_PARTIAL1, numblock);
+	m_ctrlr->writeByte(ATA_PORT_PARTIAL2, numblock >> 8);
+	m_ctrlr->writeByte(ATA_PORT_PARTIAL3, numblock >> 16);
+
+	m_ctrlr->writeByte(ATA_PORT_DRIVE_SELECT, 0xE0 | (m_isSlave ? 0x10 : 0) | ((numblock >> 24) & 0x0F));
+}
+
+bool ATADrive::readBlocks(u64int start, u32int count, u8int* data) {
+	if (start + count >= m_blockCount) return false;
+
+	cmdCommon(start, count);
+	m_ctrlr->writeByte(ATA_PORT_COMMAND, ATA_CMD_READ);
+
+	while (!(m_ctrlr->readByte(ATA_PORT_COMMAND) & 0x08));	//Wait for the drive to be ready
+
+	for (u32int idx = 0; idx < count * 256; idx++) {
+		u16int tmpword = m_ctrlr->readWord(ATA_PORT_DATA);
+		data[idx * 2] = (u8int)tmpword;
+		data[idx * 2 + 1] = (u8int)(tmpword >> 8);
+	}
+	return true;	
+}
+
+bool ATADrive::writeBlocks(u64int start, u32int count, u8int* data) {
+	if (start + count >= m_blockCount) return false;
+	if (readOnly()) return false;
+
+	cmdCommon(start, count);
+	m_ctrlr->writeByte(ATA_PORT_COMMAND, ATA_CMD_WRITE);
+
+	while (!(m_ctrlr->readByte(ATA_PORT_COMMAND) & 0x08));	//Wait for the drive to be ready
+
+	for (u32int idx = 0; idx < count * 256; idx++) {
+		u16int tmpword = (data[idx * 2]) | (data[idx * 2 + 1] << 8); 
+		m_ctrlr->writeByte(ATA_PORT_DATA, tmpword);
+	}
+	return true;	
+}
+
+u32int ATADrive::blockSize() {
+	return 512;
+}
diff --git a/Source/Kernel/Devices/ATA/ATADrive.class.h b/Source/Kernel/Devices/ATA/ATADrive.class.h
new file mode 100644
index 0000000..b6087bf
--- /dev/null
+++ b/Source/Kernel/Devices/ATA/ATADrive.class.h
@@ -0,0 +1,30 @@
+#ifndef DEF_ATADRIVE_CLASS_H
+#define DEF_ATADRIVE_CLASS_H
+
+#include "ATAController.class.h"
+#include <Devices/BlockDevice.proto.h>
+
+class ATADrive : public BlockDevice {
+	friend class ATAController;
+	private:
+	ATADrive(ATAController* ctrlr, bool isSlave, u32int blockCount, u16int* identifyData);
+
+	ATAController* m_ctrlr;
+	bool m_isSlave;
+	u32int m_blockCount;
+	u16int m_identifyData[256];
+
+	void cmdCommon(u32int numblock, u32int count);
+
+	public:
+	String getClass();
+	String getName();
+
+	bool readOnly();
+	u64int blocks();
+	bool readBlocks(u64int start, u32int count, u8int* data);
+	bool writeBlocks(u64int start, u32int count, u8int* data);
+	u32int blockSize();
+};
+
+#endif