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drives.c
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drives.c
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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <ctype.h>
#include "memory.h"
#include "drives.h"
#include "units.h"
#define MAXDRIVES 16 // CP/M limit is 16.
drive_t drive_info[MAXDRIVES];
void *cpm_dirbuf;
dpb_t *shared_hdd_dpb = NULL;
const dpb_t mem_dpb_template = {
64, // unsigned int sectors_per_track;
4, // unsigned char block_shift_factor;
15, // unsigned char block_mask;
1, // unsigned char extent_mask; // assume block_count >= 256
0, // unsigned int block_count; // -1
255, // unsigned int dirent_count; // -1
0x00f0, // unsigned int dirent_alloc_vector;
0, // unsigned int check_vector_size;
0 // unsigned int system_tracks;
};
const dpb_t hdd_dpb_template = {
64, // unsigned int sectors_per_track;
5, // unsigned char block_shift_factor;
31, // unsigned char block_mask;
1, // unsigned char extent_mask;
2047, // unsigned int block_count; // -1
511, // unsigned int dirent_count; // -1
0x00f0, // unsigned int dirent_alloc_vector;
0, // unsigned int check_vector_size;
16 // unsigned int system_tracks;
};
unsigned char drives_count_valid(void)
{
unsigned char i;
for(i=0; i<MAXDRIVES; i++)
if(drive_info[i].unit == NO_UNIT)
break;
return i;
}
void prepare_drives(void)
{
unsigned char i, valid;
drive_map_t *drive;
drive_t *info;
unit_info_t *unit;
media_t media;
dph_t *dph;
valid = drives_count_valid();
if(valid == 0){
drives_default_mapping();
valid = drives_count_valid();
}
cpm_dirbuf = allocate_memory(128); // directory scratch area
drive = allocate_memory(sizeof(drive_map_t) * valid);
persist.drive_count = valid;
persist.drive_map = drive;
info = drive_info;
for(i=0; i<valid; i++){
unit = &unit_info[info->unit];
drive->unit = info->unit;
drive->lba_first = unit->lba_first +
(((unsigned long)info->slice) * ((unsigned long)SECTORS_PER_SLICE));
dph = allocate_memory(sizeof(dph_t));
drive->dph = dph;
memset(dph, 0, sizeof(dph_t));
dph->dirbuf = cpm_dirbuf;
// prepare the DPH
media = unit->media;
if(media_sliced(unit->media)){
if(!shared_hdd_dpb){
shared_hdd_dpb = allocate_memory(sizeof(dpb_t));
memcpy(shared_hdd_dpb, &hdd_dpb_template, sizeof(dpb_t));
}
dph->dpb = shared_hdd_dpb;
}else if(media == MEDIA_RAM || media == MEDIA_ROM){
if(unit->sectors > RAM_DISK_MAX_SECTORS){
printf("Memory disk too large; limiting to 4MB.\n");
unit->sectors = RAM_DISK_MAX_SECTORS;
}
dph->dpb = allocate_memory(sizeof(dpb_t));
memcpy(dph->dpb, &mem_dpb_template, sizeof(dpb_t));
dph->dpb->block_count = (unit->sectors >> 2) - 1;
if(dph->dpb->block_count & 0xff00)
dph->dpb->extent_mask = 0;
}else{
printf("Unsupported media type %02x: ", media);
}
dph->allocation_vector = allocate_memory((dph->dpb->block_count >> 3)+1);
printf("Drive %c: assigned to %s slice %d\n", 'A' + i, unit_name(info->unit), info->slice);
// next drive
drive++;
info++;
}
}
// fallback mapping: map first slice on every device, in order.
void drives_default_mapping(void)
{
unsigned char i, d;
d = 0;
for(i=0; i<(MAXUNITS < MAXDRIVES ? MAXUNITS : MAXDRIVES); i++){
if(unit_info[i].media != MEDIA_NONE && unit_info[i].slice_count){
drive_info[d].unit = i;
drive_info[d].slice = 0;
d++;
}
}
}
void init_drives(void)
{
unsigned char i;
// reset drive mapping
memset(drive_info, 0, sizeof(drive_info));
// 0 is a valid unit; fix that.
for(i=0; i<MAXDRIVES; i++)
drive_info[i].unit = NO_UNIT;
}
void print_to_space(const char *p)
{
putchar('"');
while(*p){
if(isspace(*p))
break;
putchar(*p);
p++;
}
putchar('"');
}
// parse a drive name, append it to the existing mapping.
// should stop at a NUL terminator or space character.
bool drives_extend_mapping(const char *device)
{
const char *p;
unsigned char unit, drive;
unsigned int slice;
unit_info_t *u;
unit = unit_from_name(device);
if(unit == NO_UNIT){
print_to_space(device);
printf(": Cannot find disk\n");
return false;
}
u = &unit_info[unit];
slice = 0;
p = device;
while(true){
if(!*p || isspace(*p))
break;
if(*p == '.' || *p == ':'){
slice = atoi(p+1);
break;
}
p++;
}
if(slice >= u->slice_count){
print_to_space(device);
printf(": Slice out of range\n");
return false;
}
for(drive=0; drive<MAXDRIVES; drive++){
if(drive_info[drive].unit == unit && drive_info[drive].slice == slice){
print_to_space(device);
printf(": Already assigned\n");
return false;
}
}
for(drive=0; drive<MAXDRIVES; drive++){
if(drive_info[drive].unit == NO_UNIT){
drive_info[drive].unit = unit;
drive_info[drive].slice = slice;
return true; // success
}
}
print_to_space(device);
printf(": All drives already assigned\n");
return false;
}
void drives_mapping_to_string(char *buffer, unsigned char maxlen)
{
unsigned char o, i, l, valid;
drive_t *info;
char drivename[16];
o = 0;
valid = drives_count_valid();
info = drive_info;
memset(buffer, 0, maxlen);
for(i=0; i<valid; i++){
if(info->slice)
l = sprintf(drivename, "%s.%d", unit_name(info->unit), info->slice);
else
l = sprintf(drivename, "%s", unit_name(info->unit));
if(o+l+1 < maxlen){
if(o)
buffer[o++] = ' ';
memcpy(buffer+o, drivename, l);
o += l;
}
info++;
}
}