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dingusppc/devices/ioctrl/amic.cpp

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-24 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** Apple memory-mapped I/O controller emulation.
Author: Max Poliakovski
*/
#include <core/timermanager.h>
#include <cpu/ppc/ppcemu.h>
#include <cpu/ppc/ppcmmu.h>
#include <devices/deviceregistry.h>
#include <devices/common/hwcomponent.h>
#include <devices/common/scsi/sc53c94.h>
#include <devices/common/viacuda.h>
#include <devices/ethernet/mace.h>
#include <devices/floppy/swim3.h>
#include <devices/ioctrl/amic.h>
#include <devices/serial/escc.h>
#include <machines/machinebase.h>
#include <devices/memctrl/memctrlbase.h>
#include <devices/video/displayid.h>
#include <devices/video/pdmonboard.h>
#include <algorithm>
#include <cinttypes>
#include <loguru.hpp>
#include <memory>
AMIC::AMIC() : MMIODevice()
{
this->set_name("Apple Memory-mapped I/O Controller");
supports_types(HWCompType::MMIO_DEV | HWCompType::INT_CTRL);
// connect internal SCSI controller
this->scsi = dynamic_cast<Sc53C94*>(gMachineObj->get_comp_by_name("Sc53C94"));
this->curio_dma = std::unique_ptr<AmicScsiDma> (new AmicScsiDma());
this->scsi->set_dma_channel(this->curio_dma.get());
this->scsi->set_drq_callback([this](const uint8_t drq_state) {
if (drq_state & 1)
via2_ifr |= VIA2_INT_SCSI_DRQ;
else
via2_ifr &= ~VIA2_INT_SCSI_DRQ;
this->update_via2_irq();
});
// connect serial HW
this->escc = dynamic_cast<EsccController*>(gMachineObj->get_comp_by_name("Escc"));
this->escc_xmit_b_dma = std::unique_ptr<AmicSerialXmitDma>(new AmicSerialXmitDma("EsccBXmit"));
// connect Ethernet HW
this->mace = dynamic_cast<MaceController*>(gMachineObj->get_comp_by_name("Mace"));
// connect Cuda
this->viacuda = dynamic_cast<ViaCuda*>(gMachineObj->get_comp_by_name("ViaCuda"));
// initialize sound HW
this->snd_out_dma = std::unique_ptr<AmicSndOutDma> (new AmicSndOutDma());
this->snd_out_dma->init_interrupts(this, 2 << 8);
this->awacs = std::unique_ptr<AwacDevicePdm> (new AwacDevicePdm());
this->awacs->set_dma_out(this->snd_out_dma.get());
// initialize on-board video
this->disp_id = std::unique_ptr<DisplayID> (new DisplayID());
this->def_vid = std::unique_ptr<PdmOnboardVideo> (new PdmOnboardVideo());
this->def_vid->init_interrupts(this, SLOT_INT_VBL << 16);
// initialize floppy disk HW
this->swim3 = dynamic_cast<Swim3::Swim3Ctrl*>(gMachineObj->get_comp_by_name("Swim3"));
this->floppy_dma = std::unique_ptr<AmicFloppyDma> (new AmicFloppyDma());
this->swim3->set_dma_channel(this->floppy_dma.get());
}
AMIC::~AMIC()
{
if (this->pseudo_vbl_tid) {
TimerManager::get_instance()->cancel_timer(this->pseudo_vbl_tid);
this->pseudo_vbl_tid = 0;
}
}
int AMIC::device_postinit()
{
MemCtrlBase *mem_ctrl = dynamic_cast<MemCtrlBase *>
(gMachineObj->get_comp_by_type(HWCompType::MEM_CTRL));
// add memory mapped I/O region for the AMIC control registers
if (!mem_ctrl->add_mmio_region(0x50F00000, 0x00040000, this)) {
LOG_F(ERROR, "Couldn't register AMIC registers!");
}
// AMIC drives the VIA CA1 internally to generate 60.15 Hz interrupts
this->pseudo_vbl_tid = TimerManager::get_instance()->add_cyclic_timer(
static_cast<uint64_t>((1.0f/60.15) * NS_PER_SEC + 0.5f),
[this]() {
this->viacuda->assert_ctrl_line(ViaLine::CA1);
});
// set EMMO pin status (active low)
this->emmo_pin = GET_BIN_PROP("emmo") ^ 1;
return 0;
}
uint32_t AMIC::read(uint32_t rgn_start, uint32_t offset, int size)
{
uint32_t phase_val;
// subdevices registers
switch(offset >> 12) {
case 0: // VIA1 registers
case 1:
return this->viacuda->read(offset >> 9);
case 4: // SCC registers
return this->escc->read(compat_to_macrisc[(offset >> 1) & 0xF]);
case 0xA: // MACE registers
return this->mace->read((offset >> 4) & 0x1F);
case 0x10: // SCSI registers
if (offset & 0x100) {
return this->scsi->pseudo_dma_read();
} else {
return this->scsi->read((offset >> 4) & 0xF);
}
case 0x14: // Sound registers
switch (offset) {
case AMICReg::Snd_Stat_0:
case AMICReg::Snd_Stat_1:
case AMICReg::Snd_Stat_2:
return (this->awacs->read_stat() >> (offset & 3) * 8) & 0xFF;
case AMICReg::Snd_Phase0:
case AMICReg::Snd_Phase1:
case AMICReg::Snd_Phase2:
// the sound phase register is organized as follows:
// 000000oo oooooooo oopppppp where 'o' is the 12-bit offset
// into the DMA buffer and 'p' is an undocumented prescale value
// HWInit doesn't care about. Let's hope it will be sufficient
// to return 0 for prescale.
phase_val = this->snd_out_dma->get_cur_buf_pos() << 6;
return (phase_val >> ((2 - (offset & 3)) * 8)) & 0xFF;
case AMICReg::Snd_Out_Ctrl:
return this->snd_out_ctrl;
case AMICReg::Snd_Out_DMA:
return this->snd_out_dma->read_stat();
}
break;
case 0x16: // SWIM3 registers
case 0x17:
return this->swim3->read((offset >> 9) & 0xF);
}
switch(offset) {
case AMICReg::Ariel_Config:
return this->def_vid->get_vdac_config();
case AMICReg::VIA2_Slot_IFR:
return this->via2_slot_ifr;
case AMICReg::VIA2_IFR:
case AMICReg::VIA2_IFR_RBV:
return this->via2_ifr;
case AMICReg::VIA2_Slot_IER:
return this->via2_slot_ier;
case AMICReg::VIA2_IER:
case AMICReg::VIA2_IER_RBV:
return this->via2_ier;
case AMICReg::Video_Mode:
return this->def_vid->get_video_mode();
case AMICReg::Monitor_Id:
return this->mon_id;
case AMICReg::Int_Ctrl:
return (this->int_ctrl & 0xC0) | (this->dev_irq_lines & 0x3F);
case AMICReg::DMA_IFR_0:
return this->dma_ifr0;
case AMICReg::DMA_IFR_1:
return this->dma_ifr1;
case AMICReg::Diag_Reg:
return 0xFE | this->emmo_pin;
case AMICReg::DMA_Base_Addr_0:
case AMICReg::DMA_Base_Addr_1:
case AMICReg::DMA_Base_Addr_2:
case AMICReg::DMA_Base_Addr_3:
return (this->dma_base >> (3 - (offset & 3)) * 8) & 0xFF;
case AMICReg::SCSI_DMA_Ctrl:
return this->curio_dma->read_stat();
case AMICReg::Floppy_Addr_Ptr_0:
case AMICReg::Floppy_Addr_Ptr_1:
case AMICReg::Floppy_Addr_Ptr_2:
case AMICReg::Floppy_Addr_Ptr_3:
return (this->floppy_addr_ptr >> (3 - (offset & 3)) * 8) & 0xFF;
case AMICReg::Floppy_DMA_Ctrl:
return this->floppy_dma->read_stat();
case SCC_DMA_Xmt_B_Ctrl:
return this->escc_xmit_b_dma->read_stat();
default:
LOG_F(WARNING, "Unknown AMIC register read, offset=%x", offset);
}
return 0;
}
void AMIC::write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size)
{
uint32_t mask;
// subdevices registers
switch(offset >> 12) {
case 0: // VIA1 registers
case 1:
this->viacuda->write(offset >> 9, value);
return;
case 4:
this->escc->write(compat_to_macrisc[(offset >> 1) & 0xF], value);
return;
case 0xA: // MACE registers
this->mace->write((offset >> 4) & 0x1F, value);
return;
case 0x10:
if (offset & 0x100)
this->scsi->pseudo_dma_write(value);
else
this->scsi->write((offset >> 4) & 0xF, value);
return;
case 0x14: // Sound registers
switch(offset) {
case AMICReg::Snd_Ctrl_0:
case AMICReg::Snd_Ctrl_1:
case AMICReg::Snd_Ctrl_2:
// remember values of sound control registers
this->imm_snd_regs[offset & 3] = value;
// transfer control information to the sound codec when ready
if ((this->imm_snd_regs[0] & 0xC0) == PDM_SND_CTRL_VALID) {
this->awacs->write_ctrl(
(this->imm_snd_regs[1] >> 4) | (this->imm_snd_regs[0] & 0x3F),
((this->imm_snd_regs[1] & 0xF) << 8) | this->imm_snd_regs[2]
);
}
return;
case AMICReg::Snd_Buf_Size_Hi:
case AMICReg::Snd_Buf_Size_Lo:
SET_SIZE_BYTE(this->snd_buf_size, offset, value);
this->snd_buf_size &= ~3; // sound buffer size is always a multiple of 4
LOG_F(9, "AMIC: Sound buffer size set to 0x%X", this->snd_buf_size);
return;
case AMICReg::Snd_Out_Ctrl:
if ((value & 1) != (this->snd_out_ctrl & 1)) {
if (value & 1) {
this->snd_out_dma->init(this->dma_base & ~0x3FFFF,
this->snd_buf_size);
this->snd_out_dma->enable();
this->awacs->set_sample_rate((this->snd_out_ctrl >> 1) & 3);
this->awacs->dma_out_start();
} else {
this->snd_out_dma->disable();
this->awacs->dma_out_pause();
}
}
this->snd_out_ctrl = value;
return;
case AMICReg::Snd_In_Ctrl:
LOG_F(INFO, "AMIC Sound In Ctrl updated, val=%x", value);
return;
case AMICReg::Snd_Out_DMA:
this->snd_out_dma->write_dma_out_ctrl(value);
return;
}
case 0x16: // SWIM3 registers
case 0x17:
this->swim3->write((offset >> 9) & 0xF, value);
return;
}
switch(offset) {
case AMICReg::VIA2_Slot_IFR:
if (value & SLOT_INT_VBL) {
// clear pending VBL int
this->ack_slot_int(SLOT_INT_VBL, 0);
}
break;
case AMICReg::VIA2_IFR:
// if bit 7 is set, clear the corresponding IRQ bit for each "1" in value
if (value & 0x80) {
this->via2_ifr &= ~(value & 0x7F);
this->update_via2_irq();
} else { // writing any value to VIA2_IFR with bit 7 cleared has no effect
LOG_F(WARNING, "%s: bit 7 of VIA2_IFR is cleared!", this->name.c_str());
}
break;
case AMICReg::VIA2_Slot_IER:
if (value & 0x80)
this->via2_slot_ier |= value & 0x7F;
else
this->via2_slot_ier &= ~value;
break;
case AMICReg::VIA2_IER:
case AMICReg::VIA2_IER_RBV:
if (value & 0x80) {
this->via2_ier |= value & 0x7F;
} else {
this->via2_ier &= ~value;
}
this->update_via2_irq();
break;
case AMICReg::Ariel_Clut_Index:
this->def_vid->set_clut_index(value);
break;
case AMICReg::Ariel_Clut_Color:
this->def_vid->set_clut_color(value);
break;
case AMICReg::Ariel_Config:
this->def_vid->set_vdac_config(value);
break;
case AMICReg::Video_Mode:
this->def_vid->set_video_mode(value);
break;
case AMICReg::Pixel_Depth:
this->def_vid->set_pixel_depth(value);
break;
case AMICReg::Monitor_Id: {
// extract and convert pin directions (0 - input, 1 - output)
uint8_t dirs = ~value & 7;
if (!dirs && !(value & 8)) {
LOG_F(INFO, "AMIC: Monitor sense lines tristated");
}
// propagate bit 3 to all pins configured as output
// set levels of all intput pins to "1"
uint8_t levels = (7 ^ dirs) | (((value & 8) ? 7 : 0) & dirs);
// read monitor sense lines and store the result in the bits 4-6
this->mon_id = (this->mon_id & 0xF) |
(this->disp_id->read_monitor_sense(levels, dirs) << 4);
}
break;
case AMICReg::Int_Ctrl:
// reset CPU interrupt bit if requested
if (value & CPU_INT_CLEAR) {
if (this->int_ctrl & CPU_INT_FLAG) {
this->int_ctrl &= ~CPU_INT_FLAG;
ppc_release_int();
LOG_F(5, "AMIC: CPU INT latch cleared");
}
}
// keep interrupt mode bit
// and discard read-only IQR state bits
this->int_ctrl |= value & CPU_INT_MODE;
break;
case AMICReg::DMA_Base_Addr_0:
case AMICReg::DMA_Base_Addr_1:
case AMICReg::DMA_Base_Addr_2:
case AMICReg::DMA_Base_Addr_3:
SET_ADDR_BYTE(this->dma_base, offset, value);
this->dma_base &= 0xFFFC0000UL;
LOG_F(9, "AMIC: DMA base address set to 0x%X", this->dma_base);
break;
case AMICReg::Enet_DMA_Xmt_Ctrl:
LOG_F(INFO, "AMIC Ethernet Transmit DMA Ctrl updated, val=%x", value);
break;
case AMICReg::SCSI_DMA_Base_0:
case AMICReg::SCSI_DMA_Base_1:
case AMICReg::SCSI_DMA_Base_2:
case AMICReg::SCSI_DMA_Base_3:
SET_ADDR_BYTE(this->scsi_dma_base, offset, value);
this->scsi_dma_base &= 0xFFFFFFF8UL;
LOG_F(9, "AMIC: SCSI DMA base address set to 0x%X", this->scsi_dma_base);
break;
case AMICReg::SCSI_DMA_Ctrl:
if (value & 1) { // RST bit set?
this->scsi_addr_ptr = this->scsi_dma_base;
this->curio_dma->reset(this->scsi_addr_ptr);
}
if (value & 2) { // RUN bit set?
this->curio_dma->reinit(this->scsi_dma_base);
this->scsi->real_dma_xfer((value >> 6) & 1);
}
this->curio_dma->write_ctrl(value);
break;
case AMICReg::Enet_DMA_Rcv_Ctrl:
LOG_F(INFO, "AMIC Ethernet Receive DMA Ctrl updated, val=%x", value);
break;
case AMICReg::Floppy_Addr_Ptr_2:
case AMICReg::Floppy_Addr_Ptr_3:
SET_ADDR_BYTE(this->floppy_addr_ptr, offset, value);
break;
case AMICReg::Floppy_Byte_Cnt_Hi:
case AMICReg::Floppy_Byte_Cnt_Lo:
SET_SIZE_BYTE(this->floppy_byte_cnt, offset, value);
break;
case AMICReg::Floppy_DMA_Ctrl:
if (value & 1) { // RST bit set?
this->floppy_addr_ptr = this->dma_base + 0x15000;
this->floppy_dma->reset(this->floppy_addr_ptr);
}
if (value & 2) { // RUN bit set?
this->floppy_dma->reinit(this->floppy_addr_ptr, this->floppy_byte_cnt);
}
this->floppy_dma->write_ctrl(value);
break;
case AMICReg::SCC_DMA_Xmt_A_Ctrl:
LOG_F(INFO, "AMIC SCC Transmit Ch A DMA Ctrl updated, val=%x", value);
break;
case AMICReg::SCC_DMA_Rcv_A_Ctrl:
LOG_F(INFO, "AMIC SCC Receive Ch A DMA Ctrl updated, val=%x", value);
break;
case AMICReg::SCC_DMA_Xmt_B_Ctrl:
LOG_F(INFO, "AMIC SCC Transmit Ch B DMA Ctrl updated, val=%x", value);
this->escc_xmit_b_dma->write_ctrl(value);
break;
case AMICReg::SCC_DMA_Rcv_B_Ctrl:
LOG_F(INFO, "AMIC SCC Receive Ch B DMA Ctrl updated, val=%x", value);
break;
default:
LOG_F(WARNING, "Unknown AMIC register write, offset=%x, val=%x",
offset, value);
}
}
// ======================== Interrupt related stuff ==========================
uint32_t AMIC::register_dev_int(IntSrc src_id) {
switch (src_id) {
case IntSrc::VIA_CUDA:
return CPU_INT_VIA1;
case IntSrc::SCSI_CURIO:
return VIA2_INT_SCSI_IRQ << 8;
case IntSrc::SWIM3:
return VIA2_INT_SWIM3 << 8;
case IntSrc::NMI:
return CPU_INT_NMI;
default:
ABORT_F("AMIC: unknown interrupt source %d", src_id);
}
return 0;
}
uint32_t AMIC::register_dma_int(IntSrc src_id) {
ABORT_F("AMIC: register_dma_int() not implemented");
return 0;
}
void AMIC::ack_int(uint32_t irq_id, uint8_t irq_line_state) {
// dispatch cascaded AMIC interrupts from various sources
// irq_id format: 00DDCCBBAA where
// - AA -> CPU interrupts
// - BB -> pseudo VIA2 interrupts
// - CC -> slot interrupts
if (irq_id < 0x100) {
this->ack_cpu_int(irq_id, irq_line_state);
} else if (irq_id < 0x10000) {
this->ack_via2_int(irq_id >> 8, irq_line_state);
} else if (irq_id < 0x1000000) {
this->ack_slot_int(irq_id >> 16, irq_line_state);
} else {
ABORT_F("AMIC: unknown interrupt source ID 0x%X", irq_id);
}
}
void AMIC::ack_slot_int(uint32_t irq_id, uint8_t irq_line_state) {
// CAUTION: reverse logic (0 - true, 1 - false) in the IFR register!
if (irq_line_state) {
this->via2_slot_ifr &= ~irq_id;
} else {
this->via2_slot_ifr |= irq_id;
}
uint8_t new_irq = !!(~this->via2_slot_ifr & this->via2_slot_ier & 0x7F);
if (new_irq != this->via2_slot_irq) {
this->via2_slot_irq = new_irq;
this->ack_via2_int(VIA2_INT_ALL_SLOT, new_irq);
}
}
void AMIC::update_via2_irq() {
uint8_t new_irq = !!(this->via2_ifr & this->via2_ier & 0x7F);
this->via2_ifr = (this->via2_ifr & 0x7F) | (new_irq << 7);
if (new_irq != this->via2_irq) {
this->via2_irq = new_irq;
this->ack_cpu_int(CPU_INT_VIA2, new_irq);
}
}
void AMIC::ack_via2_int(uint32_t irq_id, uint8_t irq_line_state) {
if (irq_line_state) {
this->via2_ifr |= irq_id;
} else {
this->via2_ifr &= ~irq_id;
}
this->update_via2_irq();
}
void AMIC::ack_cpu_int(uint32_t irq_id, uint8_t irq_line_state) {
if (this->int_ctrl & CPU_INT_MODE) { // 68k interrupt emulation mode?
if (irq_line_state) {
this->dev_irq_lines |= irq_id;
} else {
this->dev_irq_lines &= ~irq_id;
}
if (!(this->int_ctrl & CPU_INT_FLAG)) {
this->int_ctrl |= CPU_INT_FLAG;
ppc_assert_int();
LOG_F(5, "AMIC: CPU INT asserted, source: %d", irq_id);
} else {
LOG_F(5, "AMIC: CPU INT already latched");
}
} else {
ABORT_F("AMIC: native interrupt mode not implemented");
}
}
void AMIC::ack_dma_int(uint32_t irq_id, uint8_t irq_line_state) {
if (irq_id >= 0x100) { // DMA Interrupt Flags 1
irq_id = (irq_id >> 8) & 0xFFU;
if (irq_line_state)
this->dma_ifr1 |= irq_id;
else
this->dma_ifr1 &= ~irq_id;
} else { // DMA Interrupt Flags 0
irq_id &= 0xFFU;
if (irq_line_state)
this->dma_ifr0 |= irq_id;
else
this->dma_ifr0 &= ~irq_id;
}
uint8_t new_irq = (this->dma_ifr0 || this->dma_ifr1) ? 1 : 0;
if (new_irq != this->dma_irq) {
this->dma_irq = new_irq;
this->ack_cpu_int(CPU_INT_ALL_DMA, new_irq);
}
}
// ============================ Sound DMA stuff ================================
AmicSndOutDma::AmicSndOutDma() : DmaOutChannel("SndOut")
{
this->dma_out_ctrl = 0;
this->enabled = false;
}
void AmicSndOutDma::init(uint32_t buf_base, uint32_t buf_samples)
{
this->out_buf0 = buf_base + AMIC_SND_BUF0_OFFS;
this->out_buf1 = buf_base + AMIC_SND_BUF1_OFFS;
this->out_buf_len = buf_samples * 2 * 2;
this->snd_buf_num = 0;
this->cur_buf_pos = 0;
this->irq_level = 0;
}
uint8_t AmicSndOutDma::read_stat()
{
return this->dma_out_ctrl;
}
void AmicSndOutDma::update_irq() {
uint8_t new_level = !!((this->dma_out_ctrl >> 4) & this->dma_out_ctrl);
if (new_level != this->irq_level) {
this->irq_level = new_level;
TimerManager::get_instance()->add_immediate_timer([this] {
this->int_ctrl->ack_dma_int(this->irq_id, this->irq_level);
});
}
}
void AmicSndOutDma::write_dma_out_ctrl(uint8_t value)
{
// clear interrupt flags
if (value & PDM_DMA_INTS_MASK) {
this->dma_out_ctrl &= ~(value & PDM_DMA_INTS_MASK);
this->update_irq();
}
// update sound output DMA interrupt enable bits
this->dma_out_ctrl = (this->dma_out_ctrl & 0xF1U) | (value & 0x0EU);
}
DmaPullResult AmicSndOutDma::pull_data(uint32_t req_len, uint32_t *avail_len,
uint8_t **p_data)
{
*avail_len = 0;
int rem_len = this->out_buf_len - this->cur_buf_pos;
if (rem_len <= 0) {
if (!this->snd_buf_num) {
// signal buffer 0 drained
this->dma_out_ctrl |= PDM_DMA_IF0;
} else {
// signal buffer 1 drained
this->dma_out_ctrl |= PDM_DMA_IF1;
}
// generate sound out DMA interrupt if (IF0 & IE0)
// or (IF1 & IE1) or (ERR_IF & ERR_IE)
this->update_irq();
// check DMA enable flag after buffer 1 was processed
// if it's false stop delivering sound data
// this will effectively stop audio playback
if (this->snd_buf_num && !this->enabled) {
return DmaPullResult::NoMoreData;
}
this->cur_buf_pos = 0; // reset buffer position
this->snd_buf_num ^= 1; // toggle sound buffers
rem_len = this->out_buf_len; // buffer size = full buffer
}
uint32_t len = std::min((uint32_t)rem_len, req_len);
MapDmaResult res = mmu_map_dma_mem(
(this->snd_buf_num ? this->out_buf1 : this->out_buf0) + this->cur_buf_pos,
len, false);
*p_data = res.host_va;
this->cur_buf_pos += len;
*avail_len = len;
return DmaPullResult::MoreData;
}
// ============================ Floppy DMA stuff ===============================
void AmicFloppyDma::reset(const uint32_t addr_ptr)
{
this->stat &= 0x48; // clear interrupt flag, RUN and RST bits
this->addr_ptr = addr_ptr;
this->byte_count = 0;
}
void AmicFloppyDma::reinit(const uint32_t addr_ptr, const uint16_t byte_cnt)
{
this->addr_ptr = addr_ptr;
this->byte_count = byte_cnt;
}
void AmicFloppyDma::write_ctrl(uint8_t value)
{
// copy over DIR, IE and RUN bits
this->stat = (this->stat & 0x81) | (value & 0x4A);
// clear interrupt flag if requested
if (value & 0x80) {
this->stat &= 0x7F;
}
}
int AmicFloppyDma::push_data(const char* src_ptr, int len)
{
len = std::min((int)this->byte_count, len);
MapDmaResult res = mmu_map_dma_mem(this->addr_ptr, len, false);
uint8_t *p_data = res.host_va;
if (!res.is_writable) {
ABORT_F("AMIC: attempting DMA write to read-only memory");
}
std::memcpy(p_data, src_ptr, len);
this->addr_ptr += len;
this->byte_count -= len;
if (!this->byte_count) {
LOG_F(WARNING, "AMIC: DMA interrupts not implemented yet");
}
return 0;
}
DmaPullResult AmicFloppyDma::pull_data(uint32_t req_len, uint32_t *avail_len,
uint8_t **p_data)
{
return DmaPullResult::NoMoreData;
}
// ============================ SCSI DMA stuff ================================
void AmicScsiDma::reset(const uint32_t addr_ptr)
{
this->stat &= 0x48; // clear interrupt flag, RUN and RST bits
this->addr_ptr = addr_ptr;
this->byte_count = 0;
}
void AmicScsiDma::reinit(const uint32_t addr_ptr)
{
this->addr_ptr = addr_ptr;
this->byte_count = 0;
}
void AmicScsiDma::write_ctrl(uint8_t value)
{
// copy over DIR, IE and RUN bits
this->stat = (this->stat & 0x81) | (value & 0x4A);
// clear interrupt flag if requested
if (value & 0x80) {
this->stat &= 0x7F;
}
}
int AmicScsiDma::push_data(const char* src_ptr, int len)
{
MapDmaResult res = mmu_map_dma_mem(this->addr_ptr, len, false);
uint8_t *p_data = res.host_va;
std::memcpy(p_data, src_ptr, len);
this->addr_ptr += len;
return 0;
}
DmaPullResult AmicScsiDma::pull_data(uint32_t req_len, uint32_t *avail_len,
uint8_t **p_data)
{
MapDmaResult res = mmu_map_dma_mem(this->addr_ptr, req_len, false);
*p_data = res.host_va;
this->addr_ptr += req_len;
*avail_len = req_len;
return DmaPullResult::MoreData;
}
// =========================== Serial DMA stuff ===============================
void AmicSerialXmitDma::write_ctrl(const uint8_t value)
{
if (value & 1) { // RST bit set?
this->stat &= 0x7C; // clear IF, RUN and RST bits
}
// copy PAUSE to FROZEN
this->stat = (this->stat & 0xDF) | ((value & 0x10) << 1);
// copy over RELOAD, PAUSE, IE, CONT and RUN bits
this->stat = (this->stat & 0xA1) | (value & 0x5E);
// clear interrupt flag if requested
if (value & 0x80) {
this->stat &= 0x7F;
}
}
DmaPullResult AmicSerialXmitDma::pull_data(uint32_t req_len, uint32_t *avail_len,
uint8_t **p_data)
{
return DmaPullResult::NoMoreData;
};
static vector<string> Amic_Subdevices = {
"ScsiCurio", "Sc53C94", "Escc", "Mace", "ViaCuda", "Swim3"
};
static const DeviceDescription Amic_Descriptor = {
AMIC::create, Amic_Subdevices, {}
};
REGISTER_DEVICE(Amic, Amic_Descriptor);
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