mirror of
https://github.com/dingusdev/dingusppc.git
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88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
//DingusPPC - Prototype 5bf2
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//Written by divingkatae
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//(c)2018-20 (theweirdo)
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//Please ask for permission
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//if you want to distribute this.
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//(divingkatae#1017 on Discord)
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//Functionality for the OPENPIC
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#include <iostream>
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#include <cstring>
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#include <cinttypes>
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#include "ppcemumain.h"
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uint32_t openpic_address;
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uint32_t openpic_write_word;
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uint32_t openpic_read_word;
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bool openpic_int_go;
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//OPENPIC ADDRESS MAP goes like this...
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//(Assuming that it's placed at 0x80040000
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//Per Processor Registers [private access] 0x40000 - 0x40fff
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//Global registers 0x41000 - 0x4ffff
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//Interrupt Source Configuration Registers 0x50000 - 0x5ffff
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//Per Processor Registers [global access] 0x60000 - 0x7ffff
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//Taken from FreeBSD source code
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void openpic_init(){
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for (int i = 0x40004; i < 0x7FFFF; i++){
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if (i % 16 == 0){
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i += 4;
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}
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machine_upperiocontrol_mem[i] = 0xFF;
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}
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machine_upperiocontrol_mem[0x40080] = 0x6B;
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machine_upperiocontrol_mem[0x40081] = 0x10;
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machine_upperiocontrol_mem[0x40082] = 0x10;
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machine_upperiocontrol_mem[0x40083] = 0x00;
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}
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void openpic_read(){
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if (openpic_address > 0x60000){
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openpic_address = (openpic_address % 0x8000) + 0x60000;
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}
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openpic_read_word = (uint32_t)(machine_upperiocontrol_mem[openpic_address++]);
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openpic_read_word = (uint32_t)((machine_upperiocontrol_mem[openpic_address++]) << 8);
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openpic_read_word = (uint32_t)((machine_upperiocontrol_mem[openpic_address++]) << 16);
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openpic_read_word = (uint32_t)((machine_upperiocontrol_mem[openpic_address]) << 24);
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}
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void openpic_write(){
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//Max of 128 interrupts per processor
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//Each interrupt line takes up 0x8000 bytes
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uint32_t op_interrupt_check = (openpic_address & 0xFF);
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//We have only one processor
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if (openpic_address > 0x60000){
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openpic_address = (openpic_address % 0x8000) + 0x60000;
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}
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machine_upperiocontrol_mem[openpic_address++] = (uint8_t)(openpic_write_word);
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machine_upperiocontrol_mem[openpic_address++] = (uint8_t)((openpic_write_word) >> 8);
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machine_upperiocontrol_mem[openpic_address++] = (uint8_t)((openpic_write_word) >> 16);
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machine_upperiocontrol_mem[openpic_address] = (uint8_t)((openpic_write_word) >> 24);
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switch (op_interrupt_check){
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case 0x80:
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printf("Task Priority Reg stuff goes here! \n");
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break;
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case 0x90:
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printf("WHOAMI stuff goes here! \n");
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break;
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case 0xA0:
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openpic_int_go = true;
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break;
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case 0xB0:
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openpic_int_go = false;
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break;
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}
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}
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