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Adds a container for the disk controller.

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Thereby appears to prove that my Amiga is getting as far as attempting to load from floppy.
This commit is contained in:
Thomas Harte 2021-08-09 17:35:09 -04:00
parent 27726fd2d1
commit 9215535bee
2 changed files with 46 additions and 8 deletions
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6
Machines/Amiga/Chipset.cpp
View File

@ -40,6 +40,7 @@ enum InterruptFlag: uint16_t {
Chipset::Chipset(uint16_t *ram, size_t size) :
blitter_(ram, size),
copper_(*this, ram, size),
disk_(*this, ram, size),
crt_(908, 4, Outputs::Display::Type::PAL50, Outputs::Display::InputDataType::Red4Green4Blue4) {
}
@ -420,7 +421,10 @@ void Chipset::perform(const CPU::MC68000::Microcycle &cycle) {
break;
// Disk DMA.
case Write(0x020): case Write(0x022): case Write(0x024):
case Write(0x020): disk_.set_address<16>(cycle.value16()); break;
case Write(0x022): disk_.set_address<0>(cycle.value16()); break;
case Write(0x024): disk_.set_length(cycle.value16()); break;
case Write(0x026):
LOG("TODO: disk DMA; " << PADHEX(4) << cycle.value16() << " to " << *cycle.address);
break;

48
Machines/Amiga/Chipset.hpp
View File

@ -61,6 +61,18 @@ class Chipset {
Outputs::Display::DisplayType get_display_type() const;
private:
// MARK: - Common base for DMA components.
class DMADevice {
public:
DMADevice(Chipset &chipset, uint16_t *ram, size_t size) : chipset_(chipset), ram_(ram), ram_mask_(uint32_t(size - 1)) {}
protected:
Chipset &chipset_;
uint16_t *ram_ = nullptr;
uint32_t ram_mask_ = 0;
};
// MARK: - Interrupts.
uint16_t interrupt_enable_ = 0;
@ -103,9 +115,9 @@ class Chipset {
// MARK: - Copper.
class Copper {
class Copper: public DMADevice {
public:
Copper(Chipset &chipset, uint16_t *ram, size_t size) : chipset_(chipset), ram_(ram), ram_mask_(uint32_t(size - 1)) {}
using DMADevice::DMADevice;
/// Offers a DMA slot to the Copper, specifying the current beam position.
///
@ -134,8 +146,6 @@ class Chipset {
}
private:
Chipset &chipset_;
uint32_t address_ = 0;
uint32_t addresses_[2]{};
uint16_t control_ = 0;
@ -146,9 +156,6 @@ class Chipset {
bool skip_next_ = false;
uint16_t instruction_[2]{};
uint16_t position_mask_ = 0xffff;
uint16_t *ram_ = nullptr;
uint32_t ram_mask_ = 0;
} copper_;
// MARK: - Serial port.
@ -163,6 +170,33 @@ class Chipset {
uint16_t status;
} serial_;
// MARK: - Disk drives.
class DiskDMA: public DMADevice {
public:
using DMADevice::DMADevice;
template <int shift> void set_address(uint16_t value) {
address_ = (address_ & (0xffff'0000 >> shift)) | uint32_t(value << shift);
}
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_, address_);
}
}
private:
uint32_t address_;
uint16_t length_;
bool dma_enable_ = false;
bool write_ = false;
} disk_;
// MARK: - Pixel output.
Outputs::CRT::CRT crt_;