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some code added to rp06

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folkert van heusden 2024-06-12 14:58:06 +02:00
parent fcfef542d4
commit 0490f57bc7
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
2 changed files with 77 additions and 9 deletions
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62
rp06.cpp
View file

@ -1,5 +1,6 @@
// (C) 2024 by Folkert van Heusden
// Released under MIT license
// Some of the code is translated from Neil Webber's PDP11/70 emulator
#include <errno.h>
#include <string.h>
@ -13,7 +14,11 @@
#include "utils.h"
const char *regnames[] { "Control", "Status", "Error register 1", "Maintenance", "Attention summary", "Desired sector/track address", "Look ahead", "Drive type", "Serial no", "Offset", "Desired cylinder address", "Current cylinder address", "Error register 2", "Error register 3", "ECC position", "ECC pattern" };
constexpr const int NSECT = 22; // sectors per track
constexpr const int NTRAC = 19; // tracks per cylinder
constexpr const int SECTOR_SIZE = 512;
constexpr const char *regnames[] { "Control", "Status", "Error register 1", "Maintenance", "Attention summary", "Desired sector/track address", "Look ahead", "Drive type", "Serial no", "Offset", "Desired cylinder address", "Current cylinder address", "Error register 2", "Error register 3", "ECC position", "ECC pattern" };
rp06::rp06(bus *const b, std::atomic_bool *const disk_read_activity, std::atomic_bool *const disk_write_activity) :
b(b),
@ -76,9 +81,14 @@ uint16_t rp06::read_word(const uint16_t addr)
return value;
}
int rp06::reg_num(uint16_t addr) const
{
return (addr - RP06_BASE) / 2;
}
void rp06::write_byte(const uint16_t addr, const uint8_t v)
{
uint16_t vtemp = registers[(addr - RP06_BASE) / 2];
uint16_t vtemp = registers[reg_num(addr)];
if (addr & 1) {
vtemp &= ~0xff00;
@ -92,19 +102,61 @@ void rp06::write_byte(const uint16_t addr, const uint8_t v)
write_word(addr, vtemp);
}
uint32_t rp06::compute_offset() const
{
// cyl num, track num, sector num, which were written like this:
uint16_t cn = registers[reg_num(RP06_DC)];
uint16_t tn = (registers[reg_num(RP06_DA)] >> 8) & 0377;
uint16_t sn = registers[reg_num(RP06_DA)] & 0377;
// each cylinder is NSECT*NTRAC sectors
// each track is NSECT sectors
uint32_t offs = cn * NSECT * NTRAC;
offs += tn * NSECT;
offs += sn;
offs *= SECTOR_SIZE;
return offs;
}
uint32_t rp06::getphysaddr() const
{
constexpr const uint16_t A16 = 0400;
constexpr const uint16_t A17 = 01000;
// low 16 bits in UBA, and tack on A16/A17
bool cur_A16 = registers[reg_num(RP06_CS1)] & A16;
bool cur_A17 = registers[reg_num(RP06_CS1)] & A17;
uint16_t cur_A1621 = 0;
// but also bits may be found in bae... the assumption here is
// if these bits are non-zero they override A16/A17 but they
// really need to be consistent...
if (registers[reg_num(RP06_BAE)]) {
cur_A16 = false; // subsumed in A1621
cur_A17 = false; // subsumed
cur_A1621 = registers[reg_num(RP06_BAE)] & 077;
}
return registers[reg_num(RP06_UBA)] | (cur_A16 << 16) | (cur_A17 << 17) | (cur_A1621 << 16);
}
void rp06::write_word(const uint16_t addr, uint16_t v)
{
const int reg = (addr - RP06_BASE) / 2;
const int reg = reg_num(addr);
TRACE("RP06: write \"%s\"/%06o: %06o", regnames[reg], addr, v);
registers[reg] = v;
if (reg == RP06_CR) {
if (reg == RP06_CS1) {
if (v & 1) {
int function_code = (v >> 1) & 31;
int function_code = v & 63;
if (function_code == 070) {
}
}
}
}

24
rp06.h
View file

@ -1,5 +1,6 @@
// (C) 2024 by Folkert van Heusden
// Released under MIT license
// Some of the code is translated from Neil Webber's PDP11/70 emulator
#pragma once
@ -15,9 +16,20 @@
#include "disk_backend.h"
#define RP06_CR 0176700 // control register
#define RP06_BASE RP06_CSR
#define RP06_END (RP06_MPR + 2)
#define RP06_CS1 0176700 // control register
#define RP06_WC 0176702 // word count
#define RP06_UBA 0176704 // UNIBUS address
#define RP06_DA 0176706 // desired address
#define RP06_CS2 0176710 // control/status register 2
#define RP06_DS 0176712 // drive status
#define RP06_AS 0176716 // unified attention status
#define RP06_RMLA 0176720 // lookahead (sector under head!!)
#define RP06_OFR 0176732 // heads offset
#define RP06_DC 0176734 // desired cylinder
#define RP06_CC 0176736 // "current cylinder" and/or holding register
#define RP06_BAE 0176750 // address extension (pdp11/70 extra phys bits)
#define RP06_BASE RP06_CS1
#define RP06_END (RP06_BAE + 2)
class bus;
@ -27,11 +39,15 @@ class rp06: public disk_device
private:
bus *const b;
uint16_t registers[20] { };
uint16_t registers[32] { };
std::atomic_bool *const disk_read_activity { nullptr };
std::atomic_bool *const disk_write_activity { nullptr };
int reg_num(uint16_t addr) const;
uint32_t getphysaddr() const;
uint32_t compute_offset() const;
public:
rp06(bus *const b, std::atomic_bool *const disk_read_activity, std::atomic_bool *const disk_write_activity);
virtual ~rp06();