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rk11.c
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rk11.c
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#include "11.h"
#include "rk11.h"
// not particularly accurate
// and no implementation of maintenance mode
// RK05 has:
// 256 16bit words per sector
// 12 sectors per cylinder
// 2 surfaces
// 203 cylinders per surface
// 1500 rpm
enum {
// RKDS
SC_EQ_SA = 020,
WPS = 040, // write protect status
ARDY = 0100, // access ready
DRY = 0200, // drive ready
SOK = 0400, // sector counter ok
SIN = 01000, // seek incomplete
DRU = 02000, // drive unsafe
HDEN = 04000, // high density disk
DPL = 010000, // drive power low
// RKCS
GO = 1,
IDE = 0100, // interrupt on done enable
RDY = 0200, // ready
SSE = 0400, // stop on soft error
RWA = 01000, // r/w all
FMT = 02000, // format
IBA = 04000, // inhibit incrementing RKBA
MAINT = 010000, // maintenance mode - not implemented
SCP = 020000, // search complete
HE = 040000, // hard error
ERR = 0100000, // error
// RKER
WCE = 1, // write check error
CSE = 2, // checksum error
NXS = 040, // non existent sector
NXC = 0100, // non existent cylinder
NXD = 0200, // non existent disk
RTE = 0400, // read timing error
DLT = 01000, // data late
NXM = 02000, // non existent memory
PCE = 04000, // programming error
SKE = 010000, // seek error
WLO = 020000, // write lockout violation
OVR = 040000, // overrun
DRE = 0100000, // drive error
FR_CTL_RESET = 0,
FR_WRITE,
FR_READ,
FR_WRITE_CHECK,
FR_SEEK,
FR_READ_CHECK,
FR_DRIVE_RESET,
FR_WRITE_LOCK
};
#define ISXFER(func) ((056>>(func))&1)
void start_rk05(RK05 *drive, RK11 *rk);
void reset_rk05(RK05 *drive);
void svc_rk05(RK05 *drive, RK11 *rk, int selected);
int
dati_rk11(Bus *bus, void *dev)
{
RK11 *rk = dev;
rk->bus = bus;
if(bus->addr >= 0777400 && bus->addr < 0777420){
switch(bus->addr&016){
case 000: bus->data = rk->rkds | rk->drives[rk->d].rkds; break;
case 002: bus->data = rk->rker; break;
case 004: bus->data = rk->rkcs; break;
case 006: bus->data = rk->rkwc; break;
case 010: bus->data = rk->rkba; break;
case 012: bus->data = rk->rkda; break;
case 014: bus->data = rk->rkmr; break;
case 016: bus->data = rk->rkdb; break;
default: assert(0); /* can't happen */
}
return 0;
}
return 1;
}
static int
datox_rk11(Bus *bus, RK11 *rk, word mask)
{
rk->bus = bus;
if(bus->addr >= 0777400 && bus->addr < 0777420){
switch(bus->addr&017){
case 000: // RKDS
case 001:
case 002: // RKER
case 003:
break; // read only
case 004: // RKCS
case 005:
SETMASK(rk->rkcs, bus->data, mask&0017577);
break;
case 006: // RKWC
case 007:
SETMASK(rk->rkwc, bus->data, mask);
break;
case 010: // RKBA
case 011:
SETMASK(rk->rkba, bus->data, mask);
break;
case 012: // RKDA
case 013:
if(rk->rkcs & RDY){
SETMASK(rk->rkda, bus->data, mask);
rk->d = (rk->rkda>>13) & 7;
}else if((rk->rkcs & GO)==0)
rk->done = 1;
break;
case 014: // RKMR
case 015:
// not implemented
break;
case 016: // RKDB
case 017:
// read only
break;
default: assert(0); /* can't happen */
}
return 0;
}
return 1;
}
int
dato_rk11(Bus *bus, void *dev)
{
return datox_rk11(bus, (RK11*)dev, 0177777);
}
int
datob_rk11(Bus *bus, void *dev)
{
return datox_rk11(bus, (RK11*)dev, bus->addr&1 ? 0177400 : 0377);
}
static int
blockaddr(int cyl, int surf, int sect)
{
return (cyl*2 + surf)*12 + sect;
}
static int
busaddr(RK11 *rk)
{
int addr = rk->rkba | (rk->rkcs&060)<<12;
if((rk->rkcs & IBA)==0){
rk->rkba += 2;
if(rk->rkba == 0)
SETMASK(rk->rkcs, rk->rkcs+020, 060);
}
return addr;
}
static void
rkerr(RK05 *drive, RK11 *rk, int err)
{
rk->rker |= err;
if(rk->rker & 177740){
rk->rkcs |= RDY;
drive->func = 0;
}
}
/* start new function */
void
start_rk11(RK05 *drive, RK11 *rk)
{
drive->func = (rk->rkcs>>1) & 7;
rk->rkcs &= ~SCP;
rk->done = 0;
switch(drive->func){
case FR_CTL_RESET:
reset_rk11(rk);
break;
case FR_WRITE:
case FR_READ:
case FR_WRITE_CHECK:
case FR_READ_CHECK:
rk->rkcs &= ~RDY;
if(drive->fp == nil)
rkerr(drive, rk, NXD);
if((rk->rkda&017) >= 12)
rkerr(drive, rk, NXS);
if(((rk->rkda>>5)&0377) >= 0312)
rkerr(drive, rk, NXC);
if(drive->rkds & WPS &&
(drive->func == FR_WRITE || drive->func == FR_WRITE_CHECK))
rkerr(drive, rk, WLO);
else
drive->newcyl = (rk->rkda>>5)&0377;
break;
case FR_SEEK:
drive->newcyl = (rk->rkda>>5)&0377;
break;
case FR_DRIVE_RESET:
reset_rk05(&rk->drives[rk->d]);
break;
case FR_WRITE_LOCK:
drive->rkds |= WPS;
drive->func = 0;
break;
}
}
int
svc_rk11(Bus *bus, void *dev)
{
int i;
RK11 *rk = dev;
if((rk->rkcs & RDY) && (rk->rkcs & GO)){
rk->rkcs &= ~GO;
start_rk11(&rk->drives[rk->d], rk);
}
for(i = 0; i < 8; i++)
svc_rk05(&rk->drives[i], rk, rk->d == i);
if(rk->rker & 177740)
rk->rkcs |= HE;
else
rk->rkcs &= ~HE;
if(rk->rker)
rk->rkcs |= ERR;
else
rk->rkcs &= ~ERR;
return (rk->rkcs&IDE) &&
// TODO: probably just have one interrupt bit?
(rk->done || (rk->rkcs&HE) || (rk->rkcs&ERR) && (rk->rkcs&SSE)) ?
5 : 0;
}
int
bg_rk11(void *dev)
{
RK11 *rk = dev;
// is this right?
rk->done = 0;
return 0220;
}
void
reset_rk11(void *dev)
{
int i;
RK11 *rk = dev;
rk->rkds = 0;
rk->rker = 0;
rk->rkcs = RDY;
rk->rkwc = 0;
rk->rkba = 0;
rk->rkda = 0;
rk->rkmr = 0;
rk->rkdb = 0;
rk->state = 0;
rk->done = 0;
rk->d = 0;
for(i = 0; i < 8; i++)
reset_rk05(&rk->drives[i]);
}
void
attach_rk05(RK11 *rk, int n, char *path)
{
if(rk->drives[n].fp)
detach_rk05(rk, n);
rk->drives[n].fp = fopen(path, "r+");
if(rk->drives[n].fp == nil)
rk->drives[n].fp = fopen(path, "w+");
if(rk->drives[n].fp == nil)
fprintf(stderr, "couldn't open '%s'\n", path);
reset_rk05(&rk->drives[n]);
}
void
detach_rk05(RK11 *rk, int n)
{
if(rk->drives[n].fp){
fclose(rk->drives[n].fp);
rk->drives[n].fp = nil;
}
reset_rk05(&rk->drives[n]);
}
void
reset_rk05(RK05 *drive)
{
// TODO: figure out what to actually do here
drive->rkds = HDEN;
drive->func = 0;
drive->cyl_timer = 0;
drive->newcyl = 0;
drive->dsb = 0;
}
static void
count(RK05 *drive, RK11 *rk)
{
word rkda;
if(rk->rkwc == 0)
return;
rkda = rk->rkda+1;
if((rkda & 017) == 12)
rkda = (rkda&~017)+020;
if((rkda&0160000) != (rk->rkda&0160000))
rkerr(drive, rk, OVR);
SETMASK(rk->rkda, rkda, 017777);
// seek
drive->newcyl = (rkda>>5) & 0377;
}
void
svc_rk05(RK05 *drive, RK11 *rk, int selected)
{
if(drive->fp == nil){
reset_rk05(drive);
return;
}
drive->rkds |= DRY | SOK;
// movement
// TODO: do some actual timing here?
// move head (seek)
drive->rkds &= ~ARDY;
if(drive->cyl != drive->newcyl){
if(drive->cyl_timer)
drive->cyl_timer--;
if(drive->cyl_timer == 0){
if(drive->cyl < drive->newcyl)
drive->cyl++;
else
drive->cyl--;
// some fake value, should be around 640us
drive->cyl_timer = 500;
}
// search complete
if(drive->cyl == drive->newcyl &&
drive->func == FR_SEEK){
rk->rkds = (drive-rk->drives)<<13;
rk->rkcs |= SCP;
drive->func = 0;
rk->done = 1;
}
}else if(drive->func == 0)
drive->rkds |= ARDY;
drive->surf = (rk->rkda>>4)&1;
// transfer data to/from sector we're interested in
if(selected && ISXFER(drive->func) &&
drive->cyl == drive->newcyl && (rk->rkda&017) == drive->sc){
// beginning of new sector
if(drive->wc == 0){
int pos = blockaddr(drive->cyl, drive->surf, drive->sc)*512;
fseek(drive->fp, pos, 0);
fread(rk->buf, 1, 512, drive->fp);
// rewind so we can write back easily
fseek(drive->fp, pos, 0);
rk->state = 1;
}
// transfer one word
if(rk->state == 1 && rk->rkwc){
rk->rkwc++;
if(drive->func == FR_READ){
drive->dsb = WD(rk->buf[drive->wc*2+1], rk->buf[drive->wc*2]);
rk->rkdb = drive->dsb;
// write to bus
rk->bus->data = rk->rkdb;
rk->bus->addr = busaddr(rk);
if(dato_bus(rk->bus))
rkerr(drive, rk, NXM);
}else if(drive->func == FR_WRITE ||
drive->func == FR_WRITE_CHECK){
// read from bus
rk->bus->addr = busaddr(rk);
if(dati_bus(rk->bus))
rkerr(drive, rk, NXM);
rk->rkdb = rk->bus->data;
drive->dsb = rk->rkdb;
rk->buf[drive->wc*2] = drive->dsb;
rk->buf[drive->wc*2+1] = drive->dsb>>8;
}
// transfer finished
if(rk->rkwc == 0)
// have to keep the function around till
// the end of the block
rk->done = 1;
}
}
// rotate
drive->wc++;
if(drive->wc >= 256){
// end of sector
drive->wc = 0;
// end of current sector
if(selected && ISXFER(drive->func) &&
drive->cyl == drive->newcyl && (rk->rkda&017) == drive->sc){
if(rk->state == 1){
count(drive, rk);
// write back
if(drive->func == FR_WRITE ||
drive->func == FR_WRITE_CHECK)
fwrite(rk->buf, 1, 512, drive->fp);
rk->state = 0;
}
// end of transfer
if(rk->rkwc == 0){
rk->rkcs |= RDY;
drive->func = 0;
}
}
drive->rkds &= ~SOK;
drive->sc++;
// should be one revolution every 40ms
if(drive->sc >= 12)
drive->sc = 0;
}
drive->rkds &= ~017;
drive->rkds |= drive->sc;
if((rk->rkda&017) == drive->sc)
drive->rkds |= SC_EQ_SA;
else
drive->rkds &= ~SC_EQ_SA;
}