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(MESS) corvushd: Use Corvus drive id numbers throughout. (nw)

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Using the Corvus id number consistently throughout makes it easier to reason
about this code.  Previously, some functions used a 0-based drive index 
(0..14) and others used the 1-based Corvus id number (1..15).  The only
place we actually need it to be 0-based is in corvus_hdc_file(), so now we
just convert it there instead of in several places.
This commit is contained in:
Mike Naberezny 2014-07-06 19:44:19 +00:00
parent 2bdfe24399
commit b026ca42e2
1 changed files with 29 additions and 31 deletions
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60
src/emu/machine/corvushd.c
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@ -255,7 +255,7 @@ bool corvus_hdc_t::parse_hdc_command(UINT8 data) {
// Write a variably-sized chunk of data to the CHD file
//
// Pass:
// drv: Drive number to write to
// drv: Corvus drive id (1..15)
// sector: Physical sector number to write to
// buffer: Buffer to write
// len: Length of the buffer (amount of data to write)
@ -323,7 +323,7 @@ UINT8 corvus_hdc_t::corvus_write_sector(UINT8 drv, UINT32 sector, UINT8 *buffer,
//
UINT8 corvus_hdc_t::corvus_write_logical_sector(dadr_t *dadr, UINT8 *buffer, int len) {
UINT8 status; // Status returned from Physical Sector read
UINT8 drv; // Drive number (1 - 15)
UINT8 drv; // Corvus drive id (1..15)
UINT32 sector; // Sector number on drive
//
@ -334,13 +334,13 @@ UINT8 corvus_hdc_t::corvus_write_logical_sector(dadr_t *dadr, UINT8 *buffer, int
//
// For example: 0x23 would decode to Drive ID #3, high-order nibble: 0x02.
//
drv = (dadr->address_msn_and_drive & 0x0f) - 1;
drv = (dadr->address_msn_and_drive & 0x0f);
sector = (dadr->address_msn_and_drive & 0xf0 << 12) | (dadr->address_mid << 8) | dadr->address_lsb;
LOG(("corvus_write_logical_sector: Writing based on DADR: 0x%6.6x, logical sector: 0x%5.5x, drive: %d\n",
dadr->address_msn_and_drive << 16 | dadr->address_lsb << 8 | dadr->address_mid, sector, drv));
// Set up the global corvus_hdc so m_tracks_per_cylinder and m_sectors_per_track are valid
// Set m_tracks_per_cylinder and m_sectors_per_track
corvus_hdc_file(drv);
//
@ -363,7 +363,7 @@ UINT8 corvus_hdc_t::corvus_write_logical_sector(dadr_t *dadr, UINT8 *buffer, int
// Read a variably-sized chunk of data from the CHD file
//
// Pass:
// drv: Drive number to read from
// drv: Corvus drive id (1..15)
// sector: Physical sector number to read from
// buffer: Buffer to hold the data read from the disk
// len: Length of the buffer
@ -420,7 +420,7 @@ UINT8 corvus_hdc_t::corvus_read_sector(UINT8 drv, UINT32 sector, UINT8 *buffer,
//
UINT8 corvus_hdc_t::corvus_read_logical_sector(dadr_t *dadr, UINT8 *buffer, int len) {
UINT8 status; // Status returned from Physical Sector read
UINT8 drv; // Drive number (1 - 15)
UINT8 drv; // Corvus drive id (1..15)
UINT32 sector; // Sector number on drive
//
@ -431,13 +431,13 @@ UINT8 corvus_hdc_t::corvus_read_logical_sector(dadr_t *dadr, UINT8 *buffer, int
//
// For example: 0x23 would decode to Drive ID #3, high-order nibble: 0x02.
//
drv = (dadr->address_msn_and_drive & 0x0f) - 1;
drv = (dadr->address_msn_and_drive & 0x0f);
sector = (dadr->address_msn_and_drive & 0xf0 << 12) | (dadr->address_mid << 8) | dadr->address_lsb;
LOG(("corvus_read_logical_sector: Reading based on DADR: 0x%6.6x, logical sector: 0x%5.5x, drive: %d\n",
dadr->address_msn_and_drive << 16 | dadr->address_lsb << 8 | dadr->address_mid, sector, drv));
// Set up the global corvus_hdc so m_tracks_per_cylinder and m_sectors_per_track are valid
// Set up m_tracks_per_cylinder and m_sectors_per_track
corvus_hdc_file(drv);
//
@ -480,7 +480,7 @@ UINT8 corvus_hdc_t::corvus_lock_semaphore(UINT8 *name) {
//
// Read the semaphore table from the drive
//
status = corvus_read_sector(0, 7, semaphore_table.semaphore_block.semaphore_table, 256);
status = corvus_read_sector(1, 7, semaphore_table.semaphore_block.semaphore_table, 256);
if(status != STAT_SUCCESS) {
logerror("corvus_lock_semaphore: Error reading semaphore table, status: 0x%2.2x\n", status);
m_buffer.semaphore_locking_response.result = SEM_DISK_ERROR;
@ -514,7 +514,7 @@ UINT8 corvus_hdc_t::corvus_lock_semaphore(UINT8 *name) {
} else {
m_buffer.semaphore_locking_response.result = SEM_PRIOR_STATE_NOT_SET; // It wasn't there already
memcpy(&semaphore_table.semaphore_block.semaphore_entry[blank_offset], name, 8);// Stick it into the table
status = corvus_write_sector(0, 7, semaphore_table.semaphore_block.semaphore_table, 256);
status = corvus_write_sector(1, 7, semaphore_table.semaphore_block.semaphore_table, 256);
if(status != STAT_SUCCESS) {
logerror("corvus_lock_semaphore: Error updating semaphore table, status: 0x%2.2x\n", status);
m_buffer.semaphore_locking_response.result = SEM_DISK_ERROR;
@ -554,7 +554,7 @@ UINT8 corvus_hdc_t::corvus_unlock_semaphore(UINT8 *name) {
//
// Read the semaphore table from the drive
//
status = corvus_read_sector(0, 7, semaphore_table.semaphore_block.semaphore_table, 256);
status = corvus_read_sector(1, 7, semaphore_table.semaphore_block.semaphore_table, 256);
if(status != STAT_SUCCESS) {
logerror("corvus_unlock_semaphore: Error reading semaphore table, status: 0x%2.2x\n", status);
m_buffer.semaphore_locking_response.result = SEM_DISK_ERROR;
@ -584,7 +584,7 @@ UINT8 corvus_hdc_t::corvus_unlock_semaphore(UINT8 *name) {
} else {
m_buffer.semaphore_locking_response.result = SEM_PRIOR_STATE_SET; // It was there
memcpy(&semaphore_table.semaphore_block.semaphore_entry[offset], " ", 8); // Clear it
status = corvus_write_sector(0, 7, semaphore_table.semaphore_block.semaphore_table, 256);
status = corvus_write_sector(1, 7, semaphore_table.semaphore_block.semaphore_table, 256);
if(status != STAT_SUCCESS) {
logerror("corvus_unlock_semaphore: Error updating semaphore table, status: 0x%2.2x\n", status);
m_buffer.semaphore_locking_response.result = SEM_DISK_ERROR;
@ -616,7 +616,7 @@ UINT8 corvus_hdc_t::corvus_init_semaphore_table() {
memset(semaphore_table.semaphore_block.semaphore_table, 0x20, 256);
status = corvus_write_sector(0, 7, semaphore_table.semaphore_block.semaphore_table, 256);
status = corvus_write_sector(1, 7, semaphore_table.semaphore_block.semaphore_table, 256);
if(status != STAT_SUCCESS) {
logerror("corvus_init_semaphore_table: Error updating semaphore table, status: 0x%2.2x\n", status);
return status;
@ -633,7 +633,7 @@ UINT8 corvus_hdc_t::corvus_init_semaphore_table() {
// Fills in the Drive Parameter packet based on the opened CHD file
//
// Pass:
// drv: Drive number to get parameters from
// drv: Corvus drive id (1..15)
//
// Returns:
// Status of command
@ -658,8 +658,6 @@ UINT8 corvus_hdc_t::corvus_get_drive_parameters(UINT8 drv) {
//
// Make sure a valid drive is being accessed
//
drv -= 1; // Internally, drives start at 0
if ( ! corvus_hdc_file( drv ) )
{
logerror("corvus_get_drive_parameters: Attempt to retrieve parameters from non-existant drive: %d\n", drv);
@ -730,7 +728,7 @@ UINT8 corvus_hdc_t::corvus_get_drive_parameters(UINT8 drv) {
memcpy(m_buffer.drive_param_response.table_info.lsi11_vdo_table, raw_disk_parameter_block.dpb.lsi11_vdo_table, 8);
memcpy(m_buffer.drive_param_response.table_info.lsi11_spare_table, raw_disk_parameter_block.dpb.lsi11_spare_table, 8);
m_buffer.drive_param_response.drive_number = drv + 1;
m_buffer.drive_param_response.drive_number = drv;
m_buffer.drive_param_response.physical_capacity.msb = (raw_capacity & 0xff0000) >> 16;
m_buffer.drive_param_response.physical_capacity.midb = (raw_capacity & 0x00ff00) >> 8;
m_buffer.drive_param_response.physical_capacity.lsb = (raw_capacity & 0x0000ff);
@ -757,8 +755,7 @@ UINT8 corvus_hdc_t::corvus_get_drive_parameters(UINT8 drv) {
UINT8 corvus_hdc_t::corvus_read_boot_block(UINT8 block) {
LOG(("corvus_read_boot_block: Reading boot block: %d\n", block));
return corvus_read_sector(0, 25 + block, m_buffer.read_512_response.data, 512);
return corvus_read_sector(1, 25 + block, m_buffer.read_512_response.data, 512);
}
@ -784,7 +781,7 @@ UINT8 corvus_hdc_t::corvus_read_firmware_block(UINT8 head, UINT8 sector) {
LOG(("corvus_read_firmware_block: Reading firmware head: 0x%2.2x, sector: 0x%2.2x, relative_sector: 0x%2.2x\n",
head, sector, relative_sector));
status = corvus_read_sector(0, relative_sector, m_buffer.read_512_response.data, 512); // TODO: Which drive should Prep Mode talk to ???
status = corvus_read_sector(1, relative_sector, m_buffer.read_512_response.data, 512); // TODO: Which drive should Prep Mode talk to ???
return status;
}
@ -812,7 +809,7 @@ UINT8 corvus_hdc_t::corvus_write_firmware_block(UINT8 head, UINT8 sector, UINT8
LOG(("corvus_write_firmware_block: Writing firmware head: 0x%2.2x, sector: 0x%2.2x, relative_sector: 0x%2.2x\n",
head, sector, relative_sector));
status = corvus_write_sector(0, relative_sector, buffer, 512); // TODO: Which drive should Prep Mode talk to ???
status = corvus_write_sector(1, relative_sector, buffer, 512); // TODO: Which drive should Prep Mode talk to ???
return status;
}
@ -835,8 +832,8 @@ UINT8 corvus_hdc_t::corvus_format_drive(UINT8 *pattern, UINT16 len) {
UINT8 status = 0;
UINT8 tbuffer[512];
// Set up the global corvus_hdc so m_tracks_per_cylinder and m_sectors_per_track are valid
corvus_hdc_file(0);
// Set up m_tracks_per_cylinder and m_sectors_per_track
corvus_hdc_file(1);
max_sector = m_sectors_per_track * m_tracks_per_cylinder * m_cylinders_per_drive;
@ -848,11 +845,11 @@ UINT8 corvus_hdc_t::corvus_format_drive(UINT8 *pattern, UINT16 len) {
pattern = tbuffer;
}
LOG(("corvus_format_drive: Formatting drive with 0x%5.5x sectors, pattern buffer (passed length: %d)follows\n", max_sector, 512));
LOG(("corvus_format_drive: Formatting drive with 0x%5.5x sectors, pattern buffer (passed length: %d) follows\n", max_sector, 512));
LOG_BUFFER(pattern, 512);
for(sector = 0; sector <= max_sector; sector++) {
status = corvus_write_sector(0, sector, pattern, 512);
status = corvus_write_sector(1, sector, pattern, 512);
if(status != STAT_SUCCESS) {
logerror("corvus_format_drive: Error while formatting drive in corvus_write_sector--sector: 0x%5.5x, status: 0x%x2.2x\n",
sector, status);
@ -871,23 +868,24 @@ UINT8 corvus_hdc_t::corvus_format_drive(UINT8 *pattern, UINT16 len) {
// Returns a hard_disk_file object for a given virtual hard drive device in the concept
//
// Pass:
// id: Drive number (1 - 15)
// drv: Corvus drive id (1..15)
//
// Returns:
// hard_disk_file object
//
hard_disk_file *corvus_hdc_t::corvus_hdc_file(int id) {
hard_disk_file *corvus_hdc_t::corvus_hdc_file(int drv) {
static const char *const tags[] = {
"harddisk1", "harddisk2", "harddisk3", "harddisk4"
};
// we only support 4 drives, as per the tags[] table, so prevent a crash
if (id > 3)
// Corvus drive id numbers are 1-based so we check 1..4 instead of 0..3
if (drv < 1 || drv > 4)
{
return NULL;
}
harddisk_image_device *img = siblingdevice<harddisk_image_device>(tags[id]);
harddisk_image_device *img = siblingdevice<harddisk_image_device>(tags[drv - 1]);
if ( !img )
return NULL;
@ -902,7 +900,7 @@ hard_disk_file *corvus_hdc_t::corvus_hdc_file(int id) {
m_tracks_per_cylinder = info->heads;
m_cylinders_per_drive = info->cylinders;
LOG(("corvus_hdc_file: Attached to drive %u image: H:%d, C:%d, S:%d\n", id, info->heads, info->cylinders, info->sectors));
LOG(("corvus_hdc_file: Attached to drive %u image: H:%d, C:%d, S:%d\n", drv, info->heads, info->cylinders, info->sectors));
return file;
}
@ -979,7 +977,7 @@ void corvus_hdc_t::corvus_process_command_packet(bool invalid_command_flag) {
break;
case SEMAPHORE_STATUS_MOD:
m_buffer.semaphore_status_response.status =
corvus_read_sector(0, 7, m_buffer.semaphore_status_response.table, 256);
corvus_read_sector(1, 7, m_buffer.semaphore_status_response.table, 256);
break;
default:
invalid_command_flag = true;