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Make a first attempt to spool into RAM.

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This commit is contained in:
Thomas Harte 2021-10-08 18:11:47 -07:00
parent b47ca13ed3
commit d6e2a3f425
2 changed files with 24 additions and 13 deletions
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22
Machines/Amiga/Chipset.cpp
View File

@ -905,8 +905,23 @@ void Chipset::Sprite::set_image_data(int slot, uint16_t value) {
// MARK: - Disk.
void Chipset::DiskDMA::enqueue(uint16_t value, bool matches_sync) {
(void)value;
// TODO: handle matches_sync.
(void)matches_sync;
buffer_[buffer_write_ & 3] = value;
if(buffer_write_ == buffer_read_ + 4) ++buffer_read_;
++buffer_write_;
}
void Chipset::DiskDMA::set_length(uint16_t value) {
dma_enable_ = value & 0x8000;
write_ = value & 0x4000;
length_ = value & 0x3fff;
buffer_read_ = buffer_write_ = 0;
if(dma_enable_) {
printf("Disk DMA [%s of %d to %06x]\n", write_ ? "write" : "read", length_, pointer_[0]);
}
}
bool Chipset::DiskDMA::advance() {
@ -914,10 +929,11 @@ bool Chipset::DiskDMA::advance() {
if(!write_) {
// TODO: run an actual PLL, collect actual disk data.
if(length_) {
ram_[pointer_[0] & ram_mask_] = 0xffff;
if(length_ && buffer_read_ != buffer_write_) {
ram_[pointer_[0] & ram_mask_] = buffer_[buffer_read_ & 3];
++pointer_[0];
--length_;
++buffer_read_;
if(!length_) {
chipset_.posit_interrupt(InterruptFlag::DiskBlock);

15
Machines/Amiga/Chipset.hpp
View File

@ -9,6 +9,7 @@
#ifndef Chipset_hpp
#define Chipset_hpp
#include <array>
#include <cstddef>
#include <cstdint>
@ -228,16 +229,7 @@ class Chipset: private ClockingHint::Observer {
public:
using DMADevice::DMADevice;
void set_length(uint16_t value) {
dma_enable_ = value & 0x8000;
write_ = value & 0x4000;
length_ = value & 0x3fff;
if(dma_enable_) {
printf("Not yet implemented: disk DMA [%s of %d to %06x]\n", write_ ? "write" : "read", length_, pointer_[0]);
}
}
void set_length(uint16_t value);
bool advance();
void enqueue(uint16_t value, bool matches_sync);
@ -246,6 +238,9 @@ class Chipset: private ClockingHint::Observer {
uint16_t length_;
bool dma_enable_ = false;
bool write_ = false;
std::array<uint16_t, 4> buffer_;
size_t buffer_read_ = 0, buffer_write_ = 0;
} disk_;
class DiskController: public Storage::Disk::Controller {