diff options
Diffstat (limited to 'dev/ide_disk.cc')
| -rw-r--r-- | dev/ide_disk.cc | 122 |
1 files changed, 82 insertions, 40 deletions
diff --git a/dev/ide_disk.cc b/dev/ide_disk.cc index ae394c69e..555eb023e 100644 --- a/dev/ide_disk.cc +++ b/dev/ide_disk.cc @@ -208,46 +208,61 @@ IdeDisk::bytesInDmaPage(Addr curAddr, uint32_t bytesLeft) // Device registers read/write //// -void -IdeDisk::read(const Addr &offset, bool byte, bool cmdBlk, uint8_t *data) +uint16_t +IdeDisk::read(const Addr &offset, RegType_t type) { - DevAction_t action = ACT_NONE; - if (cmdBlk) { - if (offset < 0 || offset > sizeof(CommandReg_t)) - panic("Invalid disk command register offset: %#x\n", offset); + uint16_t data; + DevAction_t action = ACT_NONE; - if (!byte && offset != DATA_OFFSET) - panic("Invalid 16-bit read, only allowed on data reg\n"); + if (type == COMMAND_BLOCK) { - if (!byte) - *(uint16_t *)data = *(uint16_t *)&cmdReg.data0; - else - *data = ((uint8_t *)&cmdReg)[offset]; - - // determine if an action needs to be taken on the state machine - if (offset == STATUS_OFFSET) { + 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; - else - action = ACT_DATA_READ_SHORT; - } - - } else { + else if (offset == DATA_OFFSET) + action = ACT_DATA_READ_SHORT; + + switch (offset) { + case DATA_OFFSET: + data = cmdReg.data; + break; + case ERROR_OFFSET: + data = cmdReg.error; + break; + case NSECTOR_OFFSET: + data = cmdReg.sec_count; + break; + case SECTOR_OFFSET: + data = cmdReg.sec_num; + break; + case LCYL_OFFSET: + data = cmdReg.cyl_low; + break; + case HCYL_OFFSET: + data = cmdReg.cyl_high; + break; + case SELECT_OFFSET: + data = cmdReg.drive; + break; + case STATUS_OFFSET: + data = status; + break; + default: + panic("Invalid IDE command register offset: %#x\n", offset); + } + } + else if (type == CONTROL_BLOCK) { if (offset != ALTSTAT_OFFSET) - panic("Invalid disk control register offset: %#x\n", offset); - - if (!byte) - panic("Invalid 16-bit read from control block\n"); + panic("Invalid IDE control register offset: %#x\n", offset); - *data = status; + data = status; } if (action != ACT_NONE) updateState(action); + + return data; + } void @@ -263,9 +278,37 @@ IdeDisk::write(const Addr &offset, bool byte, bool cmdBlk, const uint8_t *data) panic("Invalid 16-bit write, only allowed on data reg\n"); if (!byte) - *((uint16_t *)&cmdReg.data0) = *(uint16_t *)data; - else - ((uint8_t *)&cmdReg)[offset] = *data; + *((uint16_t *)&cmdReg.data) = *(uint16_t *)data; + else { + switch (offset) { + case DATA_OFFSET: + cmdReg.data = *data; + break; + case FEATURES_OFFSET: + cmdReg.features = *data; + break; + case NSECTOR_OFFSET: + cmdReg.sec_count = *data; + break; + case SECTOR_OFFSET: + cmdReg.sec_num = *data; + break; + case LCYL_OFFSET: + cmdReg.cyl_low = *data; + break; + case HCYL_OFFSET: + cmdReg.cyl_high = *data; + break; + case SELECT_OFFSET: + cmdReg.drive = *data; + break; + case COMMAND_OFFSET: + cmdReg.command = *data; + break; + default: + panic("Invalid IDE command register offset: %#x\n", offset); + } + } // determine if an action needs to be taken on the state machine if (offset == COMMAND_OFFSET) { @@ -746,9 +789,10 @@ IdeDisk::intrPost() intrPending = true; // talk to controller to set interrupt - if (ctrl) + if (ctrl){ ctrl->bmi_regs[BMIS0] |= IDEINTS; ctrl->intrPost(); + } } void @@ -867,7 +911,7 @@ IdeDisk::updateState(DevAction_t action) } // put the first two bytes into the data register - memcpy((void *)&cmdReg.data0, (void *)dataBuffer, + memcpy((void *)&cmdReg.data, (void *)dataBuffer, sizeof(uint16_t)); if (!isIENSet()) { @@ -896,7 +940,7 @@ IdeDisk::updateState(DevAction_t action) // copy next short into data registers if (drqBytesLeft) - memcpy((void *)&cmdReg.data0, + memcpy((void *)&cmdReg.data, (void *)&dataBuffer[SectorSize - drqBytesLeft], sizeof(uint16_t)); } @@ -969,7 +1013,7 @@ IdeDisk::updateState(DevAction_t action) } else { // copy the latest short into the data buffer memcpy((void *)&dataBuffer[SectorSize - drqBytesLeft], - (void *)&cmdReg.data0, + (void *)&cmdReg.data, sizeof(uint16_t)); drqBytesLeft -= 2; @@ -1093,8 +1137,7 @@ IdeDisk::serialize(ostream &os) SERIALIZE_ENUM(event); // Serialize device registers - SERIALIZE_SCALAR(cmdReg.data0); - SERIALIZE_SCALAR(cmdReg.data1); + SERIALIZE_SCALAR(cmdReg.data); SERIALIZE_SCALAR(cmdReg.sec_count); SERIALIZE_SCALAR(cmdReg.sec_num); SERIALIZE_SCALAR(cmdReg.cyl_low); @@ -1146,8 +1189,7 @@ IdeDisk::unserialize(Checkpoint *cp, const string §ion) } // Unserialize device registers - UNSERIALIZE_SCALAR(cmdReg.data0); - UNSERIALIZE_SCALAR(cmdReg.data1); + UNSERIALIZE_SCALAR(cmdReg.data); UNSERIALIZE_SCALAR(cmdReg.sec_count); UNSERIALIZE_SCALAR(cmdReg.sec_num); UNSERIALIZE_SCALAR(cmdReg.cyl_low); |