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Merge zizzer:/bk/linux

Browse source 
into zower.eecs.umich.edu:/z/alschult/DiskModel/linux

--HG--
extra : convert_revision : 44678cd6aa2fa9e381d5d719d227013f5eb2a45c
This commit is contained in:
Andrew Schultz 2004-06-01 17:20:30 -04:00
commit 08b7d261b2
2 changed files with 119 additions and 73 deletions
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157
dev/ide_disk.cc
View file

@ -61,25 +61,12 @@ IdeDisk::IdeDisk(const string &name, DiskImage *img, PhysicalMemory *phys,
dmaWriteWaitEvent(this), dmaPrdReadEvent(this),
dmaReadEvent(this), dmaWriteEvent(this)
{
// Reset the device state
reset(id);
// calculate disk delay in microseconds
diskDelay = (delay * ticksPerSecond / 100000);
// initialize the data buffer and shadow registers
dataBuffer = new uint8_t[MAX_DMA_SIZE];
memset(dataBuffer, 0, MAX_DMA_SIZE);
memset(&cmdReg, 0, sizeof(CommandReg_t));
memset(&curPrd.entry, 0, sizeof(PrdEntry_t));
dmaInterfaceBytes = 0;
curPrdAddr = 0;
curSector = 0;
curCommand = 0;
cmdBytesLeft = 0;
drqBytesLeft = 0;
dmaRead = false;
intrPending = false;
// fill out the drive ID structure
memset(&driveID, 0, sizeof(struct hd_driveid));
@ -132,6 +119,32 @@ IdeDisk::IdeDisk(const string &name, DiskImage *img, PhysicalMemory *phys,
driveID.dma_ultra = 0x10;
// Statically set hardware config word
driveID.hw_config = 0x4001;
}
IdeDisk::~IdeDisk()
{
// destroy the data buffer
delete [] dataBuffer;
}
void
IdeDisk::reset(int id)
{
// initialize the data buffer and shadow registers
dataBuffer = new uint8_t[MAX_DMA_SIZE];
memset(dataBuffer, 0, MAX_DMA_SIZE);
memset(&cmdReg, 0, sizeof(CommandReg_t));
memset(&curPrd.entry, 0, sizeof(PrdEntry_t));
dmaInterfaceBytes = 0;
curPrdAddr = 0;
curSector = 0;
cmdBytes = 0;
cmdBytesLeft = 0;
drqBytesLeft = 0;
dmaRead = false;
intrPending = false;
// set the device state to idle
dmaState = Dma_Idle;
@ -147,13 +160,7 @@ IdeDisk::IdeDisk(const string &name, DiskImage *img, PhysicalMemory *phys,
}
// set the device ready bit
cmdReg.status |= STATUS_DRDY_BIT;
}
IdeDisk::~IdeDisk()
{
// destroy the data buffer
delete [] dataBuffer;
status = STATUS_DRDY_BIT;
}
////
@ -216,6 +223,7 @@ IdeDisk::read(const Addr &offset, bool byte, bool cmdBlk, uint8_t *data)
// determine if an action needs to be taken on the state machine
if (offset == STATUS_OFFSET) {
action = ACT_STAT_READ;
*data = status; // status is in a shadow, explicity copy
} else if (offset == DATA_OFFSET) {
if (byte)
action = ACT_DATA_READ_BYTE;
@ -230,7 +238,7 @@ IdeDisk::read(const Addr &offset, bool byte, bool cmdBlk, uint8_t *data)
if (!byte)
panic("Invalid 16-bit read from control block\n");
*data = ((uint8_t *)&cmdReg)[STATUS_OFFSET];
*data = status;
}
if (action != ACT_NONE)
@ -262,6 +270,8 @@ IdeDisk::write(const Addr &offset, bool byte, bool cmdBlk, const uint8_t *data)
action = ACT_DATA_WRITE_BYTE;
else
action = ACT_DATA_WRITE_SHORT;
} else if (offset == SELECT_OFFSET) {
action = ACT_SELECT_WRITE;
}
} else {
@ -271,8 +281,13 @@ IdeDisk::write(const Addr &offset, bool byte, bool cmdBlk, const uint8_t *data)
if (!byte)
panic("Invalid 16-bit write to control block\n");
if (*data & CONTROL_RST_BIT)
panic("Software reset not supported!\n");
if (*data & CONTROL_RST_BIT) {
// force the device into the reset state
devState = Device_Srst;
action = ACT_SRST_SET;
} else if (devState == Device_Srst && !(*data & CONTROL_RST_BIT)) {
action = ACT_SRST_CLEAR;
}
nIENBit = (*data & CONTROL_IEN_BIT) ? true : false;
}
@ -625,9 +640,6 @@ IdeDisk::startCommand()
uint32_t size = 0;
dmaRead = false;
// copy the command to the shadow
curCommand = cmdReg.command;
// Decode commands
switch (cmdReg.command) {
// Supported non-data commands
@ -656,7 +668,7 @@ IdeDisk::startCommand()
// Supported PIO data-in commands
case WIN_IDENTIFY:
cmdBytesLeft = sizeof(struct hd_driveid);
cmdBytes = cmdBytesLeft = sizeof(struct hd_driveid);
devState = Prepare_Data_In;
action = ACT_DATA_READY;
break;
@ -667,9 +679,9 @@ IdeDisk::startCommand()
panic("Attempt to perform CHS access, only supports LBA\n");
if (cmdReg.sec_count == 0)
cmdBytesLeft = (256 * SectorSize);
cmdBytes = cmdBytesLeft = (256 * SectorSize);
else
cmdBytesLeft = (cmdReg.sec_count * SectorSize);
cmdBytes = cmdBytesLeft = (cmdReg.sec_count * SectorSize);
curSector = getLBABase();
@ -685,9 +697,9 @@ IdeDisk::startCommand()
panic("Attempt to perform CHS access, only supports LBA\n");
if (cmdReg.sec_count == 0)
cmdBytesLeft = (256 * SectorSize);
cmdBytes = cmdBytesLeft = (256 * SectorSize);
else
cmdBytesLeft = (cmdReg.sec_count * SectorSize);
cmdBytes = cmdBytesLeft = (cmdReg.sec_count * SectorSize);
curSector = getLBABase();
@ -703,9 +715,9 @@ IdeDisk::startCommand()
panic("Attempt to perform CHS access, only supports LBA\n");
if (cmdReg.sec_count == 0)
cmdBytesLeft = (256 * SectorSize);
cmdBytes = cmdBytesLeft = (256 * SectorSize);
else
cmdBytesLeft = (cmdReg.sec_count * SectorSize);
cmdBytes = cmdBytesLeft = (cmdReg.sec_count * SectorSize);
curSector = getLBABase();
@ -719,9 +731,11 @@ IdeDisk::startCommand()
if (action != ACT_NONE) {
// set the BSY bit
cmdReg.status |= STATUS_BSY_BIT;
status |= STATUS_BSY_BIT;
// clear the DRQ bit
cmdReg.status &= ~STATUS_DRQ_BIT;
status &= ~STATUS_DRQ_BIT;
// clear the DF bit
status &= ~STATUS_DF_BIT;
updateState(action);
}
@ -765,16 +779,30 @@ void
IdeDisk::updateState(DevAction_t action)
{
switch (devState) {
case Device_Srst:
if (action == ACT_SRST_SET) {
// set the BSY bit
status |= STATUS_BSY_BIT;
} else if (action == ACT_SRST_CLEAR) {
// clear the BSY bit
status &= ~STATUS_BSY_BIT;
// reset the device state
reset(devID);
}
break;
case Device_Idle_S:
if (!isDEVSelect())
if (action == ACT_SELECT_WRITE && !isDEVSelect()) {
devState = Device_Idle_NS;
else if (action == ACT_CMD_WRITE)
} else if (action == ACT_CMD_WRITE) {
startCommand();
}
break;
case Device_Idle_SI:
if (!isDEVSelect()) {
if (action == ACT_SELECT_WRITE && !isDEVSelect()) {
devState = Device_Idle_NS;
intrClear();
} else if (action == ACT_STAT_READ || isIENSet()) {
@ -788,7 +816,7 @@ IdeDisk::updateState(DevAction_t action)
break;
case Device_Idle_NS:
if (isDEVSelect()) {
if (action == ACT_SELECT_WRITE && isDEVSelect()) {
if (!isIENSet() && intrPending) {
devState = Device_Idle_SI;
intrPost();
@ -826,12 +854,12 @@ IdeDisk::updateState(DevAction_t action)
}
} else if (action == ACT_DATA_READY) {
// clear the BSY bit
cmdReg.status &= ~STATUS_BSY_BIT;
status &= ~STATUS_BSY_BIT;
// set the DRQ bit
cmdReg.status |= STATUS_DRQ_BIT;
status |= STATUS_DRQ_BIT;
// copy the data into the data buffer
if (curCommand == WIN_IDENTIFY) {
if (cmdReg.command == WIN_IDENTIFY) {
// Reset the drqBytes for this block
drqBytesLeft = sizeof(struct hd_driveid);
@ -887,9 +915,9 @@ IdeDisk::updateState(DevAction_t action)
} else {
devState = Prepare_Data_In;
// set the BSY_BIT
cmdReg.status |= STATUS_BSY_BIT;
status |= STATUS_BSY_BIT;
// clear the DRQ_BIT
cmdReg.status &= ~STATUS_DRQ_BIT;
status &= ~STATUS_DRQ_BIT;
/** @todo change this to a scheduled event to simulate
disk delay */
@ -910,20 +938,23 @@ IdeDisk::updateState(DevAction_t action)
} else {
devState = Device_Idle_S;
}
} else if (cmdBytesLeft != 0) {
} else if (action == ACT_DATA_READY && cmdBytesLeft != 0) {
// clear the BSY bit
cmdReg.status &= ~STATUS_BSY_BIT;
status &= ~STATUS_BSY_BIT;
// set the DRQ bit
cmdReg.status |= STATUS_DRQ_BIT;
status |= STATUS_DRQ_BIT;
// clear the data buffer to get it ready for writes
memset(dataBuffer, 0, MAX_DMA_SIZE);
if (!isIENSet()) {
// reset the drqBytes for this block
drqBytesLeft = SectorSize;
if (cmdBytesLeft == cmdBytes || isIENSet()) {
devState = Transfer_Data_Out;
} else {
devState = Data_Ready_INTRQ_Out;
intrPost();
} else {
devState = Transfer_Data_Out;
}
}
break;
@ -956,9 +987,11 @@ IdeDisk::updateState(DevAction_t action)
writeDisk(curSector++, dataBuffer);
// set the BSY bit
cmdReg.status |= STATUS_BSY_BIT;
status |= STATUS_BSY_BIT;
// set the seek bit
status |= STATUS_SEEK_BIT;
// clear the DRQ bit
cmdReg.status &= ~STATUS_DRQ_BIT;
status &= ~STATUS_DRQ_BIT;
devState = Prepare_Data_Out;
@ -982,9 +1015,9 @@ IdeDisk::updateState(DevAction_t action)
}
} else if (action == ACT_DMA_READY) {
// clear the BSY bit
cmdReg.status &= ~STATUS_BSY_BIT;
status &= ~STATUS_BSY_BIT;
// set the DRQ bit
cmdReg.status |= STATUS_DRQ_BIT;
status |= STATUS_DRQ_BIT;
devState = Transfer_Data_Dma;
@ -1001,7 +1034,7 @@ IdeDisk::updateState(DevAction_t action)
// clear the BSY bit
setComplete();
// set the seek bit
cmdReg.status |= 0x10;
status |= STATUS_SEEK_BIT;
// clear the controller state for DMA transfer
ctrl->setDmaComplete(this);
@ -1058,7 +1091,7 @@ IdeDisk::serialize(ostream &os)
SERIALIZE_SCALAR(cmdReg.cyl_low);
SERIALIZE_SCALAR(cmdReg.cyl_high);
SERIALIZE_SCALAR(cmdReg.drive);
SERIALIZE_SCALAR(cmdReg.status);
SERIALIZE_SCALAR(status);
SERIALIZE_SCALAR(nIENBit);
SERIALIZE_SCALAR(devID);
@ -1070,9 +1103,9 @@ IdeDisk::serialize(ostream &os)
// Serialize current transfer related information
SERIALIZE_SCALAR(cmdBytesLeft);
SERIALIZE_SCALAR(cmdBytes);
SERIALIZE_SCALAR(drqBytesLeft);
SERIALIZE_SCALAR(curSector);
SERIALIZE_SCALAR(curCommand);
SERIALIZE_SCALAR(dmaRead);
SERIALIZE_SCALAR(dmaInterfaceBytes);
SERIALIZE_SCALAR(intrPending);
@ -1110,7 +1143,7 @@ IdeDisk::unserialize(Checkpoint *cp, const string &section)
UNSERIALIZE_SCALAR(cmdReg.cyl_low);
UNSERIALIZE_SCALAR(cmdReg.cyl_high);
UNSERIALIZE_SCALAR(cmdReg.drive);
UNSERIALIZE_SCALAR(cmdReg.status);
UNSERIALIZE_SCALAR(status);
UNSERIALIZE_SCALAR(nIENBit);
UNSERIALIZE_SCALAR(devID);
@ -1121,10 +1154,10 @@ IdeDisk::unserialize(Checkpoint *cp, const string &section)
UNSERIALIZE_SCALAR(curPrdAddr);
// Unserialize current transfer related information
UNSERIALIZE_SCALAR(cmdBytes);
UNSERIALIZE_SCALAR(cmdBytesLeft);
UNSERIALIZE_SCALAR(drqBytesLeft);
UNSERIALIZE_SCALAR(curSector);
UNSERIALIZE_SCALAR(curCommand);
UNSERIALIZE_SCALAR(dmaRead);
UNSERIALIZE_SCALAR(dmaInterfaceBytes);
UNSERIALIZE_SCALAR(intrPending);

33
dev/ide_disk.hh
View file

@ -94,6 +94,8 @@ class PrdTableEntry {
#define STATUS_BSY_BIT 0x80
#define STATUS_DRDY_BIT 0x40
#define STATUS_DRQ_BIT 0x08
#define STATUS_SEEK_BIT 0x10
#define STATUS_DF_BIT 0x20
#define DRIVE_LBA_BIT 0x40
#define DEV0 (0)
@ -114,10 +116,7 @@ typedef struct CommandReg {
uint8_t drive;
uint8_t head;
};
union {
uint8_t status;
uint8_t command;
};
} CommandReg_t;
typedef enum Events {
@ -135,6 +134,7 @@ typedef enum DevAction {
ACT_CMD_WRITE,
ACT_CMD_COMPLETE,
ACT_CMD_ERROR,
ACT_SELECT_WRITE,
ACT_STAT_READ,
ACT_DATA_READY,
ACT_DATA_READ_BYTE,
@ -142,7 +142,9 @@ typedef enum DevAction {
ACT_DATA_WRITE_BYTE,
ACT_DATA_WRITE_SHORT,
ACT_DMA_READY,
ACT_DMA_DONE
ACT_DMA_DONE,
ACT_SRST_SET,
ACT_SRST_CLEAR
} DevAction_t;
typedef enum DevState {
@ -151,6 +153,9 @@ typedef enum DevState {
Device_Idle_SI,
Device_Idle_NS,
// Software reset
Device_Srst,
// Non-data commands
Command_Execution,
@ -202,6 +207,8 @@ class IdeDisk : public SimObject
struct hd_driveid driveID;
/** Data buffer for transfers */
uint8_t *dataBuffer;
/** Number of bytes in command data transfer */
uint32_t cmdBytes;
/** Number of bytes left in command data transfer */
uint32_t cmdBytesLeft;
/** Number of bytes left in DRQ block */
@ -210,8 +217,8 @@ class IdeDisk : public SimObject
uint32_t curSector;
/** Command block registers */
CommandReg_t cmdReg;
/** Shadow of the current command code */
uint8_t curCommand;
/** Status register */
uint8_t status;
/** Interrupt enable bit */
bool nIENBit;
/** Device state */
@ -248,6 +255,11 @@ class IdeDisk : public SimObject
*/
~IdeDisk();
/**
* Reset the device state
*/
void reset(int id);
/**
* Set the controller for this device
* @param c The IDE controller
@ -306,17 +318,18 @@ class IdeDisk : public SimObject
void updateState(DevAction_t action);
// Utility functions
bool isBSYSet() { return (cmdReg.status & STATUS_BSY_BIT); }
bool isBSYSet() { return (status & STATUS_BSY_BIT); }
bool isIENSet() { return nIENBit; }
bool isDEVSelect() { return ((cmdReg.drive & SELECT_DEV_BIT) == devID); }
void setComplete()
{
// clear out the status byte
cmdReg.status = 0;
status = 0;
// set the DRDY bit
cmdReg.status |= STATUS_DRDY_BIT;
status |= STATUS_DRDY_BIT;
// set the SEEK bit
status |= STATUS_SEEK_BIT;
}
uint32_t getLBABase()