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dingusppc/mpc106.cpp
dingusdev 87acd53c86
Update for July 11, 2019 
- Fixed the floating point operations dispatch table and filled in a lot of missing gaps
- Started overhauling floating point emulation
- Minor fixes for Grackle reading and writing, mostly writing
- Handle integer division by zero cases
2019-07-11 22:27:14 -07:00

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7.4 KiB
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//DingusPPC - Prototype 5bf2
//Written by divingkatae
//(c)2018-20 (theweirdo)
//Please ask for permission
//if you want to distribute this.
//(divingkatae#1017 on Discord)
//Functionality for the MPC106
#include <iostream>
#include <cstring>
#include <cinttypes>
#include "viacuda.h"
#include "mpc106.h"
#include "ppcemumain.h"
#include "ppcmemory.h"
bool mpc106_address_map;
uint32_t mpc106_address; // For fe000000 - fe00ffff
uint32_t mpc_config_addr; // Device No. and Reg No. included
uint32_t mpc_config_dat; // Value to write to the device
uint32_t mpc106_write_word;
uint32_t mpc106_read_word;
uint16_t mpc106_write_half;
uint16_t mpc106_read_half;
uint8_t mpc106_write_byte;
uint8_t mpc106_read_byte;
void mpc106_init(){
mpc_config_addr = 0;
mpc_config_dat = 0;
//Initialize Vendor & Device IDs
machine_fexxxx_mem[0x00] = 0x57;
machine_fexxxx_mem[0x01] = 0x10;
machine_fexxxx_mem[0x02] = 0x02;
//PCI command + status
machine_fexxxx_mem[0x04] = 0x06;
machine_fexxxx_mem[0x06] = 0x80;
machine_fexxxx_mem[0x0B] = 0x06;
machine_fexxxx_mem[0x0C] = 0x08;
machine_fexxxx_mem[0x73] = 0xCD;
machine_fexxxx_mem[0xA8] = 0x10;
machine_fexxxx_mem[0xA9] = 0x00;
machine_fexxxx_mem[0xAA] = 0x00;
machine_fexxxx_mem[0xAB] = 0xFF;
machine_fexxxx_mem[0xAC] = 0x0C;
machine_fexxxx_mem[0xAD] = 0x06;
machine_fexxxx_mem[0xAE] = 0x0C;
machine_fexxxx_mem[0xAF] = 0x00;
machine_fexxxx_mem[0xBA] = 0x04;
machine_fexxxx_mem[0xAC] = 0x0C;
machine_fexxxx_mem[0xAD] = 0x06;
machine_fexxxx_mem[0xAE] = 0x0C;
machine_fexxxx_mem[0xAF] = 0x00;
machine_fexxxx_mem[0xAC] = 0x0C;
machine_fexxxx_mem[0xAD] = 0x06;
machine_fexxxx_mem[0xAE] = 0x0C;
machine_fexxxx_mem[0xAF] = 0x00;
machine_fexxxx_mem[0xAC] = 0x0C;
machine_fexxxx_mem[0xAD] = 0x06;
machine_fexxxx_mem[0xAE] = 0x0C;
machine_fexxxx_mem[0xAF] = 0x00;
machine_fexxxx_mem[0xF0] = 0x00;
machine_fexxxx_mem[0xF1] = 0x00;
machine_fexxxx_mem[0xF2] = 0x02;
machine_fexxxx_mem[0xF3] = 0xFF;
machine_fexxxx_mem[0xF4] = 0x03;
machine_fexxxx_mem[0xF5] = 0x00;
machine_fexxxx_mem[0xF6] = 0x00;
machine_fexxxx_mem[0xF7] = 0x00;
machine_fexxxx_mem[0xFC] = 0x00;
machine_fexxxx_mem[0xFD] = 0x00;
machine_fexxxx_mem[0xFE] = 0x10;
machine_fexxxx_mem[0xFF] = 0x00;
}
uint32_t mpc106_write_device(uint32_t device_addr, uint32_t insert_to_device, uint8_t bit_length){
//Write to the specified device - Invoked when a write is made to 0xFEExxxxx.
//device_addr is what's stored in 0xFEC00CF8 (The MPG106/Grackle's CONFIG_ADDR Register).
uint32_t reg_num = (device_addr & 0x07FC) >> 2;
uint32_t dev_num = (device_addr & 0xF800) >> 11;
switch(dev_num){
case 0:
//Device 0 is reserved to the grackle by default
mpc106_address = reg_num;
mpc106_write(insert_to_device);
break;
case 16:
case 17:
via_cuda_address = (reg_num << 9) + (dev_num << 12) + 0x3000000;
via_write_byte = (uint8_t)insert_to_device;
via_cuda_write();
break;
}
return 0;
}
uint32_t mpc106_read_device(uint32_t device_addr, uint8_t bit_length){
//Read to the specified device - Invoked when a read is made to 0xFEExxxxx.
//device_addr is what's stored in 0xFEC00CF8 (The MPG106/Grackle's CONFIG_ADDR Register).
uint32_t reg_num = (device_addr & 0x07FC) >> 2;
uint32_t dev_num = (device_addr & 0xF800) >> 11;
uint32_t grab_value = 0;
switch(dev_num){
case 0:
//Device 0 is reserved to the grackle by default
mpc106_address = reg_num;
mpc106_read();
grab_value = mpc106_read_word;
break;
case 16:
case 17:
via_cuda_address = (reg_num << 8) + (dev_num << 12) + 0x3000000;
via_cuda_read();
grab_value = (uint32_t)via_read_byte;
break;
}
return grab_value;
}
void mpc106_read(){
uint8_t read_length = 4;
switch (mpc106_address){
case 0x8:
case 0x9:
case 0xA:
case 0xB:
case 0xC:
case 0xD:
case 0xE:
case 0xF:
case 0x3C:
case 0x3D:
case 0x3E:
case 0x3F:
case 0x72:
case 0x73:
case 0xA0:
case 0xA3:
read_length = 1;
break;
case 0x0:
case 0x2:
case 0x4:
case 0x6:
case 0x70:
read_length = 2;
break;
case 0x80:
case 0x84:
case 0x88:
case 0x8C:
case 0x90:
case 0x94:
case 0x98:
case 0x9C:
case 0xF0:
case 0xF4:
case 0xF8:
case 0xFC:
read_length = 4;
default: //Avoid writing into reserved areas
read_length = 0;
}
switch(read_length){
case 1:
mpc106_read_word |= (grab_macmem_ptr[mpc106_address]);
break;
case 2:
mpc106_read_word |= (grab_macmem_ptr[mpc106_address++]);
mpc106_read_word |= (grab_macmem_ptr[mpc106_address]) << 8;
break;
case 4:
mpc106_read_word |= (grab_macmem_ptr[mpc106_address++]);
mpc106_read_word |= (grab_macmem_ptr[mpc106_address++]) << 8;
mpc106_read_word |= (grab_macmem_ptr[mpc106_address++]) << 16;
mpc106_read_word |= (grab_macmem_ptr[mpc106_address]) << 24;
break;
}
}
void mpc106_write(uint32_t write_word){
uint8_t write_length = 4;
switch (mpc106_address){
case 0x70:
case 0x72:
case 0x73:
case 0xA0:
case 0xA3:
write_length = 1;
break;
case 0x4:
case 0x6:
write_length = 2;
break;
case 0x80:
case 0x84:
case 0x88:
case 0x8C:
case 0x90:
case 0x94:
case 0x98:
case 0x9C:
case 0xF0:
case 0xF4:
case 0xF8:
case 0xFC:
write_length = 4;
default: //Avoid writing into reserved areas
write_length = 0;
}
switch(write_length){
case 1:
grab_macmem_ptr[mpc106_address] |= (uint8_t)((mpc106_read_word) & 0xFF);
break;
case 2:
grab_macmem_ptr[mpc106_address++] |= (uint8_t)((mpc106_read_word) & 0xFF);
grab_macmem_ptr[mpc106_address] |= (uint8_t)((mpc106_read_word >> 8) & 0xFF);
break;
case 4:
if ((mpc106_address == 0x88) | (mpc106_address == 0x8C) | (mpc106_address == 0x98) | (mpc106_address == 0x9C)){
grab_macmem_ptr[mpc106_address++] |= (uint8_t)((mpc106_read_word) & 0x03);
grab_macmem_ptr[mpc106_address++] |= (uint8_t)((mpc106_read_word >> 8) & 0x03);
grab_macmem_ptr[mpc106_address++] |= (uint8_t)((mpc106_read_word >> 16) & 0x03);
grab_macmem_ptr[mpc106_address] |= (uint8_t)((mpc106_read_word >> 24) & 0x03);
break;
}
else{
grab_macmem_ptr[mpc106_address++] |= (uint8_t)((mpc106_read_word) & 0xFF);
grab_macmem_ptr[mpc106_address++] |= (uint8_t)((mpc106_read_word >> 8) & 0xFF);
grab_macmem_ptr[mpc106_address++] |= (uint8_t)((mpc106_read_word >> 16) & 0xFF);
grab_macmem_ptr[mpc106_address] |= (uint8_t)((mpc106_read_word >> 24) & 0xFF);
break;
}
}
}
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