Add MACE Ethernet emulation stub.

devices/CMakeLists.txt

@@ -8,6 +8,7 @@ file(GLOB SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/*.cpp"
                   "${CMAKE_CURRENT_SOURCE_DIR}/common/i2c/*.cpp"
                   "${CMAKE_CURRENT_SOURCE_DIR}/common/pci/*.cpp"
                   "${CMAKE_CURRENT_SOURCE_DIR}/common/scsi/*.cpp"
+                  "${CMAKE_CURRENT_SOURCE_DIR}/ethernet/*.cpp"
                   "${CMAKE_CURRENT_SOURCE_DIR}/ioctrl/*.cpp"
                   "${CMAKE_CURRENT_SOURCE_DIR}/memctrl/*.cpp"
                   "${CMAKE_CURRENT_SOURCE_DIR}/sound/*.cpp"

devices/ethernet/mace.cpp

@@ -0,0 +1,55 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-21 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/>.
+*/
+
+/** @file Media Access Controller for Ethernet (MACE) emulation. */
+
+#include "mace.h"
+#include <loguru.hpp>
+
+#include <cinttypes>
+
+uint8_t MaceController::read(uint8_t reg_offset)
+{
+    switch(reg_offset) {
+    case MaceReg::Interrupt:
+        LOG_F(INFO, "MACE: all interrupt flags cleared");
+        return 0;
+    default:
+        LOG_F(INFO, "Reading MACE register %d", reg_offset);
+    }
+
+    return 0;
+}
+
+void MaceController::write(uint8_t reg_offset, uint8_t value)
+{
+    switch(reg_offset) {
+    case MaceReg::BIU_Config_Ctrl:
+        if (value & 1) {
+            LOG_F(INFO, "MACE Reset issued");
+        } else {
+            LOG_F(INFO, "MACE BIU Config set to 0x%X", value);
+        }
+        break;
+    default:
+        LOG_F(INFO, "Writing 0x%X to MACE register %d", value, reg_offset);
+    }
+}

devices/ethernet/mace.h

@@ -0,0 +1,78 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-21 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/>.
+*/
+
+/** @file Media Access Controller for Ethernet (MACE) definitions. */
+
+#ifndef MACE_H
+#define MACE_H
+
+#include <cinttypes>
+
+// MACE Chip ID from AMD datasheet
+// TODO: compare with real HW
+#define MACE_ID 0x3940
+
+// MACE registers offsets
+// Refer to the Am79C940 datasheet for details
+enum MaceReg : uint8_t {
+    Rcv_FIFO        = 0,
+    Xmit_FIFO       = 1,
+    Xmit_Frame_Ctrl = 2,
+    Xmit_Frame_Stat = 3,
+    Xmit_Retry_Cnt  = 4,
+    Rcv_Frame_Ctrl  = 5,
+    Rcv_Frame_Stat  = 6,
+    FIFO_Frame_Cnt  = 7,
+    Interrupt       = 8,
+    Interrupt_Mask  = 9,
+    Poll            = 0x0A,
+    BIU_Config_Ctrl = 0x0B,
+    FIFO_Config     = 0x0C,
+    MAC_Config_Ctrl = 0x0D,
+    PLS_Config_Ctrl = 0x0E,
+    PHY_Config_Ctrl = 0x0F,
+    Chip_ID_Lo      = 0x10,
+    Chip_ID_Hi      = 0x11,
+    Addr_Config     = 0x12,
+    Log_Addr_Flt    = 0x14,
+    Phys_Addr       = 0x15,
+    Missed_Pkt_Cnt  = 0x18,
+    Runt_Pkt_Cnt    = 0x1A, // not used in Macintosh?
+    Rcv_Collis_Cnt  = 0x1B, // not used in Macintosh?
+    User_Test       = 0x1D,
+    Rsrvd_Test_1    = 0x1E, // not used in Macintosh?
+    Rsrvd_Test_2    = 0x1F, // not used in Macintosh?
+};
+
+class MaceController {
+public:
+    MaceController(uint16_t id) { this->chip_id = id; };
+    ~MaceController() = default;
+
+    // MACE registers access
+    uint8_t read(uint8_t reg_offset);
+    void    write(uint8_t reg_offset, uint8_t value);
+
+private:
+    uint16_t    chip_id; // per-instance MACE Chip ID
+};
+
+#endif // MACE_H

devices/ioctrl/amic.cpp

@@ -26,6 +26,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 #include <cpu/ppc/ppcmmu.h>
 #include <devices/common/viacuda.h>
+#include <devices/ethernet/mace.h>
 #include <devices/ioctrl/amic.h>
 #include <machines/machinebase.h>
 #include <devices/memctrl/memctrlbase.h>
@@ -47,6 +48,7 @@ AMIC::AMIC()
         LOG_F(ERROR, "Couldn't register AMIC registers!");
     }
 
+    this->mace    = std::unique_ptr<MaceController> (new MaceController(MACE_ID));
     this->viacuda = std::unique_ptr<ViaCuda> (new ViaCuda());
 
     this->snd_out_dma = std::unique_ptr<AmicSndOutDma> (new AmicSndOutDma());
@@ -74,6 +76,8 @@ uint32_t AMIC::read(uint32_t reg_start, uint32_t offset, int size)
     case 4: // SCC registers
         LOG_F(WARNING, "AMIC: read attempt from unimplemented SCC register");
         return 0;
+    case 0xA: // MACE registers
+        return this->mace->read((offset >> 4) & 0xFF);
     case 0x10: // SCSI registers
         LOG_F(WARNING, "AMIC: read attempt from unimplemented SCSI register");
         return 0;
@@ -121,6 +125,9 @@ void AMIC::write(uint32_t reg_start, uint32_t offset, uint32_t value, int size)
     case 1:
         this->viacuda->write(offset >> 9, value);
         return;
+    case 0xA: // MACE registers
+        this->mace->write((offset >> 4) & 0xFF, value);
+        return;
     case 0x14: // Sound registers
         switch(offset) {
         case AMICReg::Snd_Ctrl_0:

devices/ioctrl/amic.h

@@ -26,6 +26,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 #include <devices/common/mmiodevice.h>
 #include <devices/common/viacuda.h>
+#include <devices/ethernet/mace.h>
 #include <devices/sound/awacs.h>
 
 #include <cinttypes>
@@ -141,6 +142,7 @@ private:
 
     uint8_t     scsi_dma_cs = 0; // SCSI DMA control/status register value
 
+    std::unique_ptr<MaceController> mace;
     std::unique_ptr<ViaCuda>        viacuda;
     std::unique_ptr<AwacDevicePdm>  awacs;